The document provides information on how fuel cells work. It begins by defining a fuel cell as an electrochemical device that converts chemicals like hydrogen and oxygen into water and electricity. It then explains the basic components and reactions that occur in different types of fuel cells, including proton exchange membrane fuel cells (PEMFC), phosphoric acid fuel cells (PAFC), molten carbonate fuel cells (MCFC), and solid oxide fuel cells (SOFC). The document also discusses applications of fuel cells and new developments like a tiny fuel cell being developed to power sensors.
Fuel cells generate electricity through an electrochemical process in which hydrogen and oxygen are combined to produce water and electricity. There are several types of fuel cells that differ based on their electrolyte material, including phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells, and proton exchange membrane fuel cells. Fuel cells have higher energy conversion efficiencies than combustion engines and can produce electricity as long as fuel is supplied, unlike batteries which have a limited capacity.
I Hope You all like it very much. I wish it is beneficial for all of you and you can get enough knowledge from it. Clear and appropriate objectives, in terms of what the audience ought to feel, think, and do as a result of seeing the presentation. Objectives are realistic – and may be intermediate parts of a wider plan.
FUEL CELLS - NS 316 UNIT III and IV Supporting PPT.pdfsungamsucram
Fuel cells produce electricity through an electrochemical reaction between hydrogen and oxygen without combustion. There are several types of fuel cells classified by their electrolyte, including alkaline fuel cells, phosphoric acid fuel cells, polymer electrolyte membrane fuel cells, molten carbonate fuel cells, and solid oxide fuel cells. Each type has advantages and disadvantages for different applications.
A fuel cell is an energy conversion device that directly converts the chemical energy of a fuel into electricity. It has porous electrodes (anode and cathode) sandwiching a solid electrolyte. At the anode, the fuel reacts to produce electrons and ions. The ions travel through the electrolyte while the electrons flow through an external circuit, powering devices. At the cathode, oxygen reacts with the ions and electrons to form water. Fuel cells produce a small voltage, so multiple cells are stacked to increase voltage. High-temperature fuel cells like solid oxide (SOFC) and molten carbonate (MCFC) fuel cells can use fuels other than hydrogen due to internal reforming, and their waste heat can be
Unit 06 - Fuel Cells, Hybrid power plant and Power factor improvementPremanandDesai
This document discusses fuel cells, hybrid power systems, and power factor improvement. It begins by defining fuel cells and describing their basic operation and classifications based on electrolyte, fuel/oxidant type, application, and other factors. It then discusses the working principles and specifications of specific fuel cell types like phosphoric acid, alkaline, and polymer electrolyte membrane fuel cells. Next, it covers hybrid power systems focusing on PV-diesel, PV-wind, and PV-fuel cell configurations. It concludes by explaining power factor, causes of low power factor, effects of low power factor, and various methods to improve power factor including static capacitors, synchronous condensers, and phase advancers.
Fuel cells generate electricity through an electrochemical reaction without combustion. They convert chemical energy stored in hydrogen fuel into electricity. Fuel cells were first demonstrated in 1839 and the first practical fuel cell was developed in 1959. Key parts include an anode, cathode, catalyst and electrolyte. Hydrogen ions pass through the electrolyte and electrons travel through an external circuit to generate electricity. Fuel cells have various applications and advantages like high efficiency and low emissions but also have disadvantages like high costs. Different types of fuel cells operate at different temperatures using different fuels and electrolytes.
The document summarizes fuel cells and provides details about phosphoric acid fuel cells (PAFC). It states that fuel cells directly convert the chemical energy of a fuel into electricity through an electrochemical reaction with oxygen without combustion. PAFC were an early commercial type of fuel cell that uses phosphoric acid as an electrolyte and operates at 150-200°C. The document describes the basic components and chemical reactions of PAFC and compares them to polymer electrolyte membrane fuel cells.
Fuel cells generate electricity through an electrochemical process in which hydrogen and oxygen are combined to produce water and electricity. There are several types of fuel cells that differ based on their electrolyte material, including phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells, and proton exchange membrane fuel cells. Fuel cells have higher energy conversion efficiencies than combustion engines and can produce electricity as long as fuel is supplied, unlike batteries which have a limited capacity.
I Hope You all like it very much. I wish it is beneficial for all of you and you can get enough knowledge from it. Clear and appropriate objectives, in terms of what the audience ought to feel, think, and do as a result of seeing the presentation. Objectives are realistic – and may be intermediate parts of a wider plan.
FUEL CELLS - NS 316 UNIT III and IV Supporting PPT.pdfsungamsucram
Fuel cells produce electricity through an electrochemical reaction between hydrogen and oxygen without combustion. There are several types of fuel cells classified by their electrolyte, including alkaline fuel cells, phosphoric acid fuel cells, polymer electrolyte membrane fuel cells, molten carbonate fuel cells, and solid oxide fuel cells. Each type has advantages and disadvantages for different applications.
A fuel cell is an energy conversion device that directly converts the chemical energy of a fuel into electricity. It has porous electrodes (anode and cathode) sandwiching a solid electrolyte. At the anode, the fuel reacts to produce electrons and ions. The ions travel through the electrolyte while the electrons flow through an external circuit, powering devices. At the cathode, oxygen reacts with the ions and electrons to form water. Fuel cells produce a small voltage, so multiple cells are stacked to increase voltage. High-temperature fuel cells like solid oxide (SOFC) and molten carbonate (MCFC) fuel cells can use fuels other than hydrogen due to internal reforming, and their waste heat can be
Unit 06 - Fuel Cells, Hybrid power plant and Power factor improvementPremanandDesai
This document discusses fuel cells, hybrid power systems, and power factor improvement. It begins by defining fuel cells and describing their basic operation and classifications based on electrolyte, fuel/oxidant type, application, and other factors. It then discusses the working principles and specifications of specific fuel cell types like phosphoric acid, alkaline, and polymer electrolyte membrane fuel cells. Next, it covers hybrid power systems focusing on PV-diesel, PV-wind, and PV-fuel cell configurations. It concludes by explaining power factor, causes of low power factor, effects of low power factor, and various methods to improve power factor including static capacitors, synchronous condensers, and phase advancers.
Fuel cells generate electricity through an electrochemical reaction without combustion. They convert chemical energy stored in hydrogen fuel into electricity. Fuel cells were first demonstrated in 1839 and the first practical fuel cell was developed in 1959. Key parts include an anode, cathode, catalyst and electrolyte. Hydrogen ions pass through the electrolyte and electrons travel through an external circuit to generate electricity. Fuel cells have various applications and advantages like high efficiency and low emissions but also have disadvantages like high costs. Different types of fuel cells operate at different temperatures using different fuels and electrolytes.
The document summarizes fuel cells and provides details about phosphoric acid fuel cells (PAFC). It states that fuel cells directly convert the chemical energy of a fuel into electricity through an electrochemical reaction with oxygen without combustion. PAFC were an early commercial type of fuel cell that uses phosphoric acid as an electrolyte and operates at 150-200°C. The document describes the basic components and chemical reactions of PAFC and compares them to polymer electrolyte membrane fuel cells.
The document summarizes key information about fuel cells. It describes that fuel cells directly convert the chemical energy of a fuel, like hydrogen, into electrical energy through electrochemical reactions. It compares the process of fuel cells to ordinary combustion, noting that fuel cells produce electricity and water as products rather than heat. The document then provides details about the components and basic operations of fuel cells, focusing on two commercially important types: phosphoric acid fuel cells and polymer electrolyte membrane fuel cells.
This document summarizes a seminar presentation about fuel cells. It begins with an introduction that defines fuel cells and batteries. It then describes the basic components and chemical reactions of different types of fuel cells, including hydrogen-oxygen, molten carbonate, PEM, and hydrocarbon-oxygen fuel cells. Applications of fuel cells currently include buses and cars that run on hydrogen fuel cells. With further technological advancements, fuel cells could potentially be used more widely for clean energy in industries and to power electronic devices. However, fuel cells also have limitations like high costs and needing specific operating conditions.
This document provides an overview of fuel cells presented by Mahida Hiren R. It begins with an introduction to fuel cells, explaining that they convert hydrogen and oxygen into water and produce electricity and heat in the process. It then discusses the various types of fuel cells, including hydrogen oxygen cells, phosphoric acid cells, molten carbonate cells, solid oxide cells, and cells using fuels like methanol, ammonia, and hydrazine. The document also covers fuel cell design principles, operation, efficiency, applications, and the sources of polarization that reduce fuel cell performance.
Fuel cells generate electricity through a chemical reaction between hydrogen and oxygen. There are several types of fuel cells that differ in their electrolyte material and operating temperatures. Alkali fuel cells use a potassium hydroxide electrolyte and operate at 150-200°C. Molten carbonate fuel cells use salt carbonate electrolytes and operate at 650°C. Phosphoric acid fuel cells use phosphoric acid and operate at 150-200°C. Proton exchange membrane fuel cells use a solid polymer electrolyte and operate at around 80°C. Solid oxide fuel cells use a ceramic electrolyte and operate at around 1000°C. Fuel cells can be powered by renewable hydrogen sources like water electrolysis or nonrenewable
This document discusses fuel cells, which are electrochemical devices that directly convert chemical energy from a fuel into electricity without combustion. It describes the basic components and principles of operation for various types of fuel cells, including proton exchange membrane fuel cells (PEMFC), phosphoric acid fuel cells (PAFC), molten carbonate fuel cells (MCFC), solid oxide fuel cells (SOFC), and others. The document also covers advantages such as high efficiency and lack of emissions, as well as challenges like high costs and low service life. Applications discussed include vehicles, submarines, portable power, and spacecraft.
This document provides an overview of fuel cells, including their construction, working, types, advantages, disadvantages, and applications. It describes how a fuel cell works by converting chemical energy from hydrogen into electrical energy through an electrochemical reaction with oxygen. The main types of fuel cells covered are alkaline fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, and solid oxide fuel cells. The advantages include high efficiency, zero emissions, and quiet operation. Disadvantages include the high cost of the technology and fuel production. Applications mentioned include power generation, transportation, portable electronics, and backup power supplies.
A fuel cell converts chemical energy from hydrogen into electricity through an electrochemical reaction with oxygen. It requires a continuous fuel source unlike batteries. There are different types of fuel cells defined by their electrolyte. A fuel cell has an anode, cathode, electrolyte and catalyst. Protons pass through the electrolyte but not electrons, which provide the current. Fuel cells produce electricity and water as byproducts. Problems include hydrogen storage and distribution limitations which can be addressed using fuel reformers.
This document provides an overview of fuel cells, including:
1. Fuel cells convert chemical energy directly into electricity through electrochemical reactions. They can produce electricity continuously as long as fuel and oxygen are supplied.
2. Fuel cells are classified based on fuel/oxidizer type and electrolyte. Common types include hydrogen-oxygen, hydrocarbon, alkaline, phosphoric acid, and molten carbonate fuel cells.
3. Proton exchange membrane fuel cells (PEMFCs) operate at lower temperatures (50-100°C) and use a proton-conducting polymer membrane. They are being developed for transport and portable power applications.
PEMFC (proton exchange membrane)
DMFC (direct methanol)
SOCF (solid oxide)
AFC (alkaline)
PAFC (phosphoric acid)
MCFC (Molten Carbonate)
PEM Fuel Cell
A fuel cell is a battery that produces DC current and voltage
Most fuel cells use hydrogen which burns cleaner compared to hydrocarbon fuels
A fuel cell will keep producing electricity as long as fuel is supplied
The energy efficiency of fuel cells is high when compared to many other energy systems
There is great interest in fuel cells for automotive and electronic applications
There will be employment for technicians particularly in Ohio’s fuel cell industry.
Electrolysis can be used to split water into hydrogen and oxygen gases. Fuel cells operate by reversing the electrolysis process, using hydrogen and oxygen to produce electricity and water. There are several types of fuel cells that differ in their electrolyte material and operating temperature, including proton exchange membrane fuel cells (PEMFCs), alkaline fuel cells (AFCs), phosphoric acid fuel cells (PAFCs), molten carbonate fuel cells (MCFCs), and solid oxide fuel cells (SOFCs). Fuel cells convert chemical energy directly into electrical energy and can use a variety of fuel sources.
This document provides an overview of fuel cells, including their construction, working, types, advantages, and applications. It describes how fuel cells use hydrogen and oxygen to produce electricity through an electrochemical reaction, with water and heat as byproducts. Various types of fuel cells are discussed, such as alkaline fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells, direct methanol fuel cells, and proton exchange membrane fuel cells. Advantages include high efficiency, zero emissions, and long operating periods, while disadvantages include high costs and hydrogen handling challenges. Applications include power sources for remote areas, vehicles, and buildings.
This document provides an overview of fuel cells, including their basic components and operation. It discusses how fuel cells work by separating hydrogen ions and electrons at the anode, with the electrons powering an external circuit before recombining with oxygen and ions at the cathode to form water. Two types of fuel cells are then described in more detail: phosphoric acid fuel cells, which were the first commercialized and use liquid phosphoric acid as the electrolyte, and alkaline fuel cells, which use an aqueous potassium hydroxide solution and react hydrogen and oxygen to produce water, heat and electricity.
A fuel cell vehicle (FCV) uses a hydrogen fuel cell to generate electricity, which powers an electric motor for propulsion, emitting only water vapor as a byproduct.
Hydrogen in fuel cell vehicles (FCVs) serves as the primary fuel that powers the vehicle. In a fuel cell, hydrogen reacts with oxygen from the air in an electrochemical process, producing electricity, water vapor, and heat. This electricity is then used to power the electric motor that drives the vehicle. The use of hydrogen in fuel cells offers a clean energy alternative, as the only emission from this process is water, making it an environmentally friendly option compared to traditional fossil fuels.
Fuel cells are known for their high efficiency, low emissions, and quiet operation, making them attractive for a wide range of applications, including transportation (such as hydrogen-powered vehicles), stationary power generation, and portable electronics.
This document provides information on fuel cells and specifically discusses alkaline fuel cells (AFCs). It describes that AFCs use an aqueous alkaline electrolyte, such as potassium hydroxide, and consume hydrogen and oxygen to produce electricity, water, and heat. AFCs have a similar construction to batteries with two electrodes separated by an electrolyte-soaked matrix. They are very sensitive to carbon dioxide and operate at temperatures of 150-200 degrees Celsius. Some advantages of AFCs are their low manufacturing costs due to inexpensive catalyst materials and efficiencies up to 70%.
The document discusses molten carbonate fuel cells (MCFCs). It provides details on their history, operation, advantages, and applications. Some key points:
- MCFCs were first experimented with in the 1930s but did not become viable until the 1950s when molten carbonate electrolytes were used.
- They operate at high temperatures (650°C) using hydrogen, oxygen and carbon dioxide as reactants to generate electricity through an oxidation-reduction reaction.
- Advantages include high efficiency (65%), carbon dioxide capture/storage abilities, and not requiring precious metal catalysts. Applications include power generation and carbon capture from industrial processes.
This document provides an overview of fuel cell technologies. It discusses the history of fuel cells from their invention in 1838 to their use in the Apollo mission. It then describes the basic components and working of a fuel cell. The document outlines various fuel cell types classified by electrolyte used, including polymer exchange membrane fuel cells, alkaline fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, solid acid fuel cells, and solid oxide fuel cells. It discusses their operating temperatures, efficiencies, applications and advantages/disadvantages. The document concludes with the future scope of developing micro fuel cells.
A fuel cell generates electricity through chemical reactions between a fuel and oxidant such as hydrogen and oxygen. It consists of an anode, cathode, and electrolyte sandwiched together. Fuel cells have many applications but require further technical developments to be economically viable at a wide commercial scale. Key challenges include reducing costs, improving water and temperature management within the cell, and increasing durability and tolerance to fuel impurities. Overcoming these issues could enable fuel cells to be practical for transportation and distributed power generation.
The document summarizes key information about fuel cells. It describes that fuel cells directly convert the chemical energy of a fuel, like hydrogen, into electrical energy through electrochemical reactions. It compares the process of fuel cells to ordinary combustion, noting that fuel cells produce electricity and water as products rather than heat. The document then provides details about the components and basic operations of fuel cells, focusing on two commercially important types: phosphoric acid fuel cells and polymer electrolyte membrane fuel cells.
This document summarizes a seminar presentation about fuel cells. It begins with an introduction that defines fuel cells and batteries. It then describes the basic components and chemical reactions of different types of fuel cells, including hydrogen-oxygen, molten carbonate, PEM, and hydrocarbon-oxygen fuel cells. Applications of fuel cells currently include buses and cars that run on hydrogen fuel cells. With further technological advancements, fuel cells could potentially be used more widely for clean energy in industries and to power electronic devices. However, fuel cells also have limitations like high costs and needing specific operating conditions.
This document provides an overview of fuel cells presented by Mahida Hiren R. It begins with an introduction to fuel cells, explaining that they convert hydrogen and oxygen into water and produce electricity and heat in the process. It then discusses the various types of fuel cells, including hydrogen oxygen cells, phosphoric acid cells, molten carbonate cells, solid oxide cells, and cells using fuels like methanol, ammonia, and hydrazine. The document also covers fuel cell design principles, operation, efficiency, applications, and the sources of polarization that reduce fuel cell performance.
Fuel cells generate electricity through a chemical reaction between hydrogen and oxygen. There are several types of fuel cells that differ in their electrolyte material and operating temperatures. Alkali fuel cells use a potassium hydroxide electrolyte and operate at 150-200°C. Molten carbonate fuel cells use salt carbonate electrolytes and operate at 650°C. Phosphoric acid fuel cells use phosphoric acid and operate at 150-200°C. Proton exchange membrane fuel cells use a solid polymer electrolyte and operate at around 80°C. Solid oxide fuel cells use a ceramic electrolyte and operate at around 1000°C. Fuel cells can be powered by renewable hydrogen sources like water electrolysis or nonrenewable
This document discusses fuel cells, which are electrochemical devices that directly convert chemical energy from a fuel into electricity without combustion. It describes the basic components and principles of operation for various types of fuel cells, including proton exchange membrane fuel cells (PEMFC), phosphoric acid fuel cells (PAFC), molten carbonate fuel cells (MCFC), solid oxide fuel cells (SOFC), and others. The document also covers advantages such as high efficiency and lack of emissions, as well as challenges like high costs and low service life. Applications discussed include vehicles, submarines, portable power, and spacecraft.
This document provides an overview of fuel cells, including their construction, working, types, advantages, disadvantages, and applications. It describes how a fuel cell works by converting chemical energy from hydrogen into electrical energy through an electrochemical reaction with oxygen. The main types of fuel cells covered are alkaline fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, and solid oxide fuel cells. The advantages include high efficiency, zero emissions, and quiet operation. Disadvantages include the high cost of the technology and fuel production. Applications mentioned include power generation, transportation, portable electronics, and backup power supplies.
A fuel cell converts chemical energy from hydrogen into electricity through an electrochemical reaction with oxygen. It requires a continuous fuel source unlike batteries. There are different types of fuel cells defined by their electrolyte. A fuel cell has an anode, cathode, electrolyte and catalyst. Protons pass through the electrolyte but not electrons, which provide the current. Fuel cells produce electricity and water as byproducts. Problems include hydrogen storage and distribution limitations which can be addressed using fuel reformers.
This document provides an overview of fuel cells, including:
1. Fuel cells convert chemical energy directly into electricity through electrochemical reactions. They can produce electricity continuously as long as fuel and oxygen are supplied.
2. Fuel cells are classified based on fuel/oxidizer type and electrolyte. Common types include hydrogen-oxygen, hydrocarbon, alkaline, phosphoric acid, and molten carbonate fuel cells.
3. Proton exchange membrane fuel cells (PEMFCs) operate at lower temperatures (50-100°C) and use a proton-conducting polymer membrane. They are being developed for transport and portable power applications.
PEMFC (proton exchange membrane)
DMFC (direct methanol)
SOCF (solid oxide)
AFC (alkaline)
PAFC (phosphoric acid)
MCFC (Molten Carbonate)
PEM Fuel Cell
A fuel cell is a battery that produces DC current and voltage
Most fuel cells use hydrogen which burns cleaner compared to hydrocarbon fuels
A fuel cell will keep producing electricity as long as fuel is supplied
The energy efficiency of fuel cells is high when compared to many other energy systems
There is great interest in fuel cells for automotive and electronic applications
There will be employment for technicians particularly in Ohio’s fuel cell industry.
Electrolysis can be used to split water into hydrogen and oxygen gases. Fuel cells operate by reversing the electrolysis process, using hydrogen and oxygen to produce electricity and water. There are several types of fuel cells that differ in their electrolyte material and operating temperature, including proton exchange membrane fuel cells (PEMFCs), alkaline fuel cells (AFCs), phosphoric acid fuel cells (PAFCs), molten carbonate fuel cells (MCFCs), and solid oxide fuel cells (SOFCs). Fuel cells convert chemical energy directly into electrical energy and can use a variety of fuel sources.
This document provides an overview of fuel cells, including their construction, working, types, advantages, and applications. It describes how fuel cells use hydrogen and oxygen to produce electricity through an electrochemical reaction, with water and heat as byproducts. Various types of fuel cells are discussed, such as alkaline fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells, direct methanol fuel cells, and proton exchange membrane fuel cells. Advantages include high efficiency, zero emissions, and long operating periods, while disadvantages include high costs and hydrogen handling challenges. Applications include power sources for remote areas, vehicles, and buildings.
This document provides an overview of fuel cells, including their basic components and operation. It discusses how fuel cells work by separating hydrogen ions and electrons at the anode, with the electrons powering an external circuit before recombining with oxygen and ions at the cathode to form water. Two types of fuel cells are then described in more detail: phosphoric acid fuel cells, which were the first commercialized and use liquid phosphoric acid as the electrolyte, and alkaline fuel cells, which use an aqueous potassium hydroxide solution and react hydrogen and oxygen to produce water, heat and electricity.
A fuel cell vehicle (FCV) uses a hydrogen fuel cell to generate electricity, which powers an electric motor for propulsion, emitting only water vapor as a byproduct.
Hydrogen in fuel cell vehicles (FCVs) serves as the primary fuel that powers the vehicle. In a fuel cell, hydrogen reacts with oxygen from the air in an electrochemical process, producing electricity, water vapor, and heat. This electricity is then used to power the electric motor that drives the vehicle. The use of hydrogen in fuel cells offers a clean energy alternative, as the only emission from this process is water, making it an environmentally friendly option compared to traditional fossil fuels.
Fuel cells are known for their high efficiency, low emissions, and quiet operation, making them attractive for a wide range of applications, including transportation (such as hydrogen-powered vehicles), stationary power generation, and portable electronics.
This document provides information on fuel cells and specifically discusses alkaline fuel cells (AFCs). It describes that AFCs use an aqueous alkaline electrolyte, such as potassium hydroxide, and consume hydrogen and oxygen to produce electricity, water, and heat. AFCs have a similar construction to batteries with two electrodes separated by an electrolyte-soaked matrix. They are very sensitive to carbon dioxide and operate at temperatures of 150-200 degrees Celsius. Some advantages of AFCs are their low manufacturing costs due to inexpensive catalyst materials and efficiencies up to 70%.
The document discusses molten carbonate fuel cells (MCFCs). It provides details on their history, operation, advantages, and applications. Some key points:
- MCFCs were first experimented with in the 1930s but did not become viable until the 1950s when molten carbonate electrolytes were used.
- They operate at high temperatures (650°C) using hydrogen, oxygen and carbon dioxide as reactants to generate electricity through an oxidation-reduction reaction.
- Advantages include high efficiency (65%), carbon dioxide capture/storage abilities, and not requiring precious metal catalysts. Applications include power generation and carbon capture from industrial processes.
This document provides an overview of fuel cell technologies. It discusses the history of fuel cells from their invention in 1838 to their use in the Apollo mission. It then describes the basic components and working of a fuel cell. The document outlines various fuel cell types classified by electrolyte used, including polymer exchange membrane fuel cells, alkaline fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, solid acid fuel cells, and solid oxide fuel cells. It discusses their operating temperatures, efficiencies, applications and advantages/disadvantages. The document concludes with the future scope of developing micro fuel cells.
A fuel cell generates electricity through chemical reactions between a fuel and oxidant such as hydrogen and oxygen. It consists of an anode, cathode, and electrolyte sandwiched together. Fuel cells have many applications but require further technical developments to be economically viable at a wide commercial scale. Key challenges include reducing costs, improving water and temperature management within the cell, and increasing durability and tolerance to fuel impurities. Overcoming these issues could enable fuel cells to be practical for transportation and distributed power generation.
Similar to Lecture Week 9 b HowFuelCellsWork.pptx (20)
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1. How Fuel Cells Work
Fuel Cells (燃料電池):
Making power more efficiently
and with less pollution.
2. Fuel Cell
- an electrochemical energy
conversion device
To convert the chemicals hydrogen and oxygen
into water, and in the process it produces
electricity.
Battery (電池): the other electrochemical device
that we are all familiar.
A battery has all of its chemicals stored inside,
and it converts those chemicals into electricity too.
This means that a battery eventually "goes dead"
and you either throw it away or recharge it.
3. For a fuel cell
Chemicals constantly flow into the cell so it
never goes dead.
As long as there is a flow of chemicals into
the cell,
the electricity flows out of the cell.
Most fuel cells in use today use hydrogen
and oxygen as the chemicals.
4. Fuel Cell Descriptions
Fuel Cells generate electricity through an
electrochemical process
In which the energy stored in a fuel is
converted directly into DC electricity.
Because electrical energy is generated
without combusting fuel,
Fuel cells are extremely attractive from an
environmental stand point.
5. Attractive characteristics
of Fuel Cell
High energy conversion efficiency
Modular design
Very low chemical and acoustical pollution
Fuel flexibility
Cogeneration capability
Rapid load response
8. It consists of three components - a cathode, an anode,
and an electrolyte sandwiched between the two.
Oxygen from the air flows through the cathode
A fuel gas containing hydrogen, such as methane,
flows past the anode.
Negatively charged oxygen ions migrate through the
electrolyte membrane react with the hydrogen to form
water,
The reacts with
the methane fuel
to form hydrogen (H2) &
carbon dioxide (CO2).
9. This electrochemical reaction generates electrons, which
flow from the anode to an external load and back to the
cathode,
a final step that both completes the circuit and supplies
electric power.
To increase voltage output, several fuel cells are stacked
together to form the heart of a clean power generator.
10. Cool Fuel Cells
Fuel cells promise to be the environmentally-
friendly power source of the future,
but some types run too hot to be practical.
NASA-funded research may have a solution.
11. All fuel cells have the
same basic operating
principle.
Fuel cells consist of an electrolyte material which is sandwiched
in between two thin electrodes (porous anode and cathode).
The input fuel passes over the anode (and oxygen over the
cathode) where it catalytically splits into ions and electrons.
The electrons go through an external circuit to serve an electric
load while the ions move through the electrolyte toward the
oppositely charged electrode.
At the electrode, ions combine to create by-products, primarily
water and CO2. Depending on the input fuel and electrolyte,
different chemical reactions will occur.
An input fuel is catalytically reacted
(electrons removed from the fuel elements)
in the fuel cell to create an electric current.
18. With thousands of diaphragm compressor installations worldwide,
you can trust PPI to handle the difficult applications. PPI has the
hydrogen compressor engineering and manufacturing
experience you can count on.
28. Four primary types
of fuel cells
They are based on the electrolyte employed:
Phosphoric Acid Fuel Cell
Molten Carbonate Fuel Cell
Solid Oxide Fuel Cell
Proton Exchange Membrane Fuel Cell
29. Phosphoric Acid Fuel Cells
-PAFCs
The most mature fuel cell technology in terms of system
development and commercialization activities.
Has been under development for more than 20 years
Has received a total worldwide investment in the
development and demonstration of the technology in
excess of $500 million.
The PAFC was selected for substantial development a
number of years ago because of the belief that, among the
low temperature fuel cells,
It was the only technology which showed relative tolerance
for reformed hydrocarbon fuels and thus could have
widespread applicability in the near term.
30. PAFC Design and Operation
The PAFC uses liquid phosphoric acid as the
electrolyte.
The phosphoric acid is contained in a Teflon bonded
silicone carbide matrix.
The small pore structure of this matrix preferentially
keeps the acid in place through capillary action.
Some acid may be entrained in the fuel or oxidant
streams and addition of acid may be required after
many hours of operation.
Platinum catalyzed, porous carbon electrodes are
used on both the fuel (anode) and oxidant (cathode)
sides of the electrolyte.
31. Fuel and oxidant gases are supplied to the backs of the porous
electrodes by parallel grooves formed into carbon or carbon-
composite plates.
These plates are electrically conductive and conduct electrons
from an anode to the cathode of the adjacent cell.
In most designs, the plates are "bi-polar" in that they have
grooves on both sides - one side supplies fuel to the anode of
one cell, while the other side supplies air or oxygen to the
cathode of the adjacent cell.
The byproduct water is removed as steam on the cathode (air
or oxygen) side of each cell by flowing excess oxidant past the
backs of the electrodes.
This water removal procedure requires that the system be
operated at temperatures around 375oF (190oC).
At lower temperatures, the product water will dissolve in the
electrolyte and not be removed as steam. At approximately
410oF (210oC), the phosphoric acid begins to decompose.
32. The byproduct water is removed as steam on the cathode
(air or oxygen) side of each cell by flowing excess oxidant
past the backs of the electrodes.
This water removal procedure requires that the system be
operated at temperatures around 375oF (190oC).
At lower temperatures, the product water will dissolve in
the electrolyte and not be removed as steam. At
approximately 410oF (210oC), the phosphoric acid begins
to decompose.
Excess heat is removed from the fuel cell stack by
providing carbon plates containing cooling channels every
few cells.
Either air or a liquid coolant, such as water, can be passed
through these channels to remove excess heat.
33. Electrochemical reactions in
PAFC
At the anode:
Hydrogen is split into two hydrogen ions (H+), which
pass through the electrolyte to the cathode, and
two electrons which pass through the external circuit
(electric load) to the cathode.
At the cathode:
the hydrogen, electrons and oxygen combine to form
water.
35. PAFC Performance
Characteristics
PAFC power plant designs show electrical efficiencies in
the range from 36% (HHV) to 42% (HHV).
The higher efficiency designs operate with pressurized
reactants.
The higher efficiency pressurized design requires more
components and likely higher cost.
PAFC power plants supply usable thermal energy at an
efficiency of 37% (HHV) to 41% (HHV).
A portion of the thermal energy can be supplied at
temperatures of ~ 250oF to ~ 300oF.
However, the majority of the thermal energy is supplied at
~150oF.
The PAFC has a power density of 160-175 watts/ft2 of
active cell area
36. Molten Carbonate Fuel Cells
- MCFC
A molten carbonate salt mixture is used as its electrolyte.
They evolved from work in the 1960's aimed at
producing a fuel cell which would operated directly on
coal.
While direct operation on coal seems less likely today,
The operation on coal-derived fuel gases or natural gas
is viable.
37. Molten Carbonate Salt
used as Electrolyte in MCFC
A molten carbonate salt mixture is used as its electrolyte.
The composition of the electrolyte (molten carbonate salt
mixture) varies, but usually consists of lithium carbonate
and potassium carbonate.
At the operating temperature of about 650oC (1200oF), the
salt mixture is liquid and a good ionic conductor.
The electrolyte is suspended in a porous, insulating and
chemically inert ceramic (LiAlO3) matrix.
38. Reactions
in MCFC
The anode process involves
a reaction between hydrogen
and carbonate ions (CO3
=)
from the electrolyte.
The reaction produces water
and carbon dioxide (CO2)
while releasing electrons to
the anode.
The cathode process combines
oxygen and CO2 from the oxidant
stream with electrons from the
cathode to produce carbonate ions
which enter the electrolyte.
The need for CO2 in the oxidant
stream requires a system for
collecting CO2 from the anode
exhaust and mixing it with the
cathode feed stream.
40. Description of reactions in MCFCs
The anode process involves a reaction between hydrogen
and carbonate ions (CO3
=) from the electrolyte.
The reaction produces water and carbon dioxide (CO2)
while releasing electrons to the anode.
The cathode process combines oxygen and CO2 from the
oxidant stream with electrons from the cathode to produce
carbonate ions which enter the electrolyte.
The need for CO2 in the oxidant stream requires a system
for collecting CO2 from the anode exhaust and mixing it
with the cathode feed stream.
41. As the operating temperature increases,
the theoretical operating voltage for a fuel cell decreases and
with it the maximum theoretical fuel efficiency.
On the other hand, increasing the operating temperature
increases the rate of the electrochemical reaction and
Thus increases the current which can be obtained at a given
voltage.
The net effect for the MCFC is that the real operating voltage is
higher than the operating voltage for the PAFC at the same
current density.
The higher operating voltage of the MCFC means that more
power is available at a higher fuel efficiency from a MCFC than
from a PAFC of the same electrode area.
As size and cost scale roughly with electrode area, this
suggests that a MCFC should be smaller and less expensive
than a "comparable" PAFC.
42. As size and cost scale roughly with electrode area, this
suggests that a MCFC should be smaller and less expensive
than a "comparable" PAFC.
The MCFC also produces excess heat at a temperature which
is high enough to yield high pressure steam which may be fed
to a turbine to generate additional electricity.
In combined cycle operation, electrical efficiencies in excess of
60% (HHV) have been suggested for mature MCFC systems.
The MCFC operates at between 1110°F (600°C) and 1200°F
(650°C) which is necessary to achieve sufficient conductivity of
the electrolyte.
To maintain this operating temperature, a higher volume of air
is passed through the cathode for cooling purposes.
43. As mentioned above, the high operating temperature of
the MCFC offers the possibility that it could operate
directly on gaseous hydrocarbon fuels such as natural gas.
The natural gas would be reformed to produce hydrogen
within the fuel cell itself.
The need for CO2 in the oxidant stream requires that CO2
from the spent anode gas be collected and mixed with the
incoming air stream.
Before this can be done, any residual hydrogen in the
spent fuel stream must be burned.
Future systems may incorporate membrane separators to
remove the hydrogen for recirculation back to the fuel
stream.
44. At cell operating temperatures of 650oC (1200oF) noble
metal catalysts are not required.
The anode is a highly porous sintered nickel powder,
alloyed with chromium to prevent agglomeration and creep
at operating temperatures.
The cathode is a porous nickel oxide material doped with
lithium.
Significant technology has been developed to provide
electrode structures which position the electrolyte with
respect to the electrodes and maintain that position while
allowing for some electrolyte boil-off during operation.
The electrolyte boil-off has an insignificant impact on cell
stack life.
45. A more significant factor of life expectancy has to do with
corrosion of the cathode.
The MCFC operating temperature is about 650oC (1200oF).
At this temperature the salt mixture is liquid and is a good
conductor.
The cell performance is sensitive to operating temperature.
A change in cell temperature from 650oC (1200oF) to
600oC (1110oF) results in a drop in cell voltage of almost
15%.
The reduction in cell voltage is due to increased ionic and
electrical resistance and a reduction in electrode kinetics.
46. Solid Oxide Fuel Cells
The Solid Oxide Fuel Cell (SOFC) uses a ceramic,
solid-phase electrolyte which reduces corrosion
considerations and eliminates the electrolyte
management problems associated with the liquid
electrolyte fuel cells.
To achieve adequate ionic conductivity in such a
ceramic, however, the system must operate at about
1000oC (1830oF).
At that temperature, internal reforming of
carbonaceous fuels should be possible, and the waste
heat from such a device would be easily utilized by
conventional thermal electricity generating plants to
yield excellent fuel efficiency.
47. The fuel cell will compete with many other types of energy
conversion devices, including
the gas turbine in city's power plant,
the gasoline engine in your car and
the battery in your laptop.
Combustion engines like the turbine and the gasoline engine
burn fuels and
use the pressure created by the expansion of the gases to
do mechanical work.
Batteries converted chemical energy back into electrical
energy when needed.
Fuel cells should do both tasks more efficiently.
A fuel cell provides a DC (direct current) voltage that can be
used to power motors, lights or any number of electrical
appliances.
48. Classification of Fuel Cells
There are several different types of fuel cells, each using a
different chemistry.
Fuel cells are usually classified by the type of electrolyte
they use.
Some types of fuel cells work well for use in stationary power
generation plants.
Others may be useful for small portable applications or for
powering cars.
The proton exchange membrane fuel cell (PEMFC) is one
of the most promising technologies.
This is the type of fuel cell that will end up powering cars,
buses and maybe even your house. Let's take a look at how
they work...
49. Tiny Fuel Cell to Power Sensors
A fuel cell prototype that is the size of a pencil eraser and can deliver small
amounts of electricity was developed at Case Western Reserve University
(CWRU).
The fuel cells are 5 mm3 in volume and generate 10 mW of power with
short pulses of up to 100 mW.
The cell power is so limited
There is no practical consumer use yet.
A cell phone, e.g., needs ~ 500 mW.
The first use will be in sensors for the military.
50. Microfuel cell
The prototype microfuel cell uses an electrochemical process to directly
convert energy from hydrogen into electricity.
The fuel cell works like a battery, using an anode and cathode, positive and
negative electrodes (solid electrical conductors), with an electrolyte.
The electrolyte can be made of various materials or solutions. The hydrogen
flows into the anode and the molecules are split into protons and electrons.
The protons flow through the electrolyte, while the electrons take a different
path, creating an electrical current.
At the other end of the fuel cell, oxygen is pulled in from the air and flows
into the cathode.
The hydrogen protons and electrons reunite in the cathode and chemically
bond with the oxygen atoms to form water molecules.
Theoretically, the only waste product produced by a fuel cell is water.
Fuel cells that extract hydrogen from natural gas or another hydrocarbon will
emit some carbon dioxide as a byproduct, but in much smaller amounts than
those produced by traditional energy sources.
51. PEMFC: Proton Exchange
Membrane Fuel Cell
The cell uses one of the simplest reactions of any fuel cell.
Animation: fuel-cell-animation.swf
52. Four Basic Elements in a PEMFC
Anode: the negative post of the fuel cell, has several jobs.
It conducts the electrons that are freed from the hydrogen
molecules
so that they can be used in an external circuit.
It has channels etched into it that disperse the hydrogen
gas equally over the surface of the catalyst.
Cathode: the positive post of the fuel cell,
has channels etched into it that distribute the oxygen to
the surface of the catalyst.
It also conducts the electrons back from the external circuit
to the catalyst,
where they can recombine with the hydrogen ions and
oxygen to form water.
53. Four Basic Elements in a PEMFC
The electrolyte is the proton exchange membrane.
This specially treated material, which looks something
like ordinary kitchen plastic wrap,
only conducts positively charged ions.
The membrane blocks electrons.
The catalyst is a special material that facilitates the
reaction of oxygen and hydrogen.
It is usually made of platinum powder very thinly coated
onto carbon paper or cloth.
The catalyst is rough and porous so that the maximum
surface area of the platinum can be exposed to the
hydrogen or oxygen.
The platinum-coated side of the catalyst faces the PEM.
55. Animation of a fuel cell working
fuel-cell-animation.swf
The pressurized hydrogen gas (H2) entering the
fuel cell on the anode side.
This gas is forced through the catalyst by the
pressure. When an H2 molecule comes in
contact with the platinum on the catalyst, it
splits into two H+ ions and two electrons (e-).
The electrons are conducted through the anode,
where they make their way through the external
circuit (doing useful work such as turning a
motor) and return to the cathode side of the fuel
cell.
56. Meanwhile, on the cathode side of the fuel cell,
oxygen gas (O2) is being forced through the catalyst,
where it forms two oxygen atoms.
Each of these atoms has a strong negative charge.
This negative charge attracts the two H+ ions through
the membrane, where they combine with an oxygen
atom and two of the electrons from the external circuit
to form a water molecule (H2O).
This reaction in a single fuel cell produces only about
0.7 volts.
To get this voltage up to a reasonable level, many
separate fuel cells must be combined to form a fuel-
cell stack (電池堆).
57. PEMFCs operate at a fairly low temperature
(about 176oF~80oC),
It means they warm up quickly and don't require
expensive containment structures.
Constant improvements in the engineering and
materials used in these cells have increased
the power density to a level where a device
about the size of a small piece of luggage can
power a car.
58. Problems with Fuel Cells
The fuel cell uses oxygen and hydrogen to produce electricity.
The oxygen required for a fuel cell comes from the air.
In fact, in the PEM fuel cell, ordinary air is pumped into the
cathode.
The hydrogen is not so readily available, however.
Hydrogen has some limitations that make it impractical for use
in most applications.
For instance, you don't have a hydrogen pipeline coming to
your house, and you can't pull up to a hydrogen pump at your
local gas station.
Hydrogen is difficult to store and distribute, so it would be much
more convenient if fuel cells could use fuels that are more
readily available.
This problem is addressed by a device called a reformer.
A reformer turns hydrocarbon or alcohol fuels into hydrogen,
which is then fed to the fuel cell.