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
A Fuel Cell is a device that converts the Chemical energy from a fuel into electricity through a chemical reaction with oxygen or another Oxidizing agent.
Fuel cells are different from batteries in that they require a continuous source of fuel and oxygen/air to sustain the chemical reaction.
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.
A Fuel Cell is a device that converts the Chemical energy from a fuel into electricity through a chemical reaction with oxygen or another Oxidizing agent.
Fuel cells are different from batteries in that they require a continuous source of fuel and oxygen/air to sustain the chemical reaction.
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.
A review on fuel cell and its applicationseSAT Journals
Abstract With the increase in the demand of electrical energy now it is the time to think for the alternate source of energy. In order to mitigate the demand of electrical energy and to create pollution free environment the fuel cell acts as an alternate solution. The fuel cells are very much similar to an ordinary dry cell or battery. It has an electrode, some chemical material and an electrical circuit to give the supply to an external circuit. Due to absence of rotating devices they are quite simple and efficient in nature. This paper describes about the working methods of fuel cells and their future and economic growth. Keywords: Fuel cell, Electrolyte, Electrode, DC
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.
a device that converts the chemical energy from a fuel into electricity through a chemical reaction with oxygen or another oxidizing agent - from MSE-HUST k54
A short presentation for students
What is a Fuel Cell?
A fuel cell is a device that converts chemical energy into electrical energy, water, and heat through electrochemical reactions.
Why to use fuel cell ?
our society is dependent upon fossil fuels such as coal, oil and gas
fossil fuels are a non-renewable energy resource
fuel prices are rising and resources dwindling
food, transport and electricity costs are affected by fuel prices
the atmosphere is becoming more and more polluted
carbon dioxide contributes to climate change and the greenhouse effect
There are 4 main parts
Anode
Cathode
Catalyst
Proton exchange membrane
The types of fuel cells are:
Alkaline fuel cells (AFC)
Solid oxide fuel cells (SOFC)
Phosphoric Acid Fuel Cell (PAFC)
Proton Exchange Membrane Fuel Cells (PEMFC)
Molten Carbonate fuel cells (MFFC)
Direct methanol fuel cells (DMFC)
A review on fuel cell and its applicationseSAT Journals
Abstract With the increase in the demand of electrical energy now it is the time to think for the alternate source of energy. In order to mitigate the demand of electrical energy and to create pollution free environment the fuel cell acts as an alternate solution. The fuel cells are very much similar to an ordinary dry cell or battery. It has an electrode, some chemical material and an electrical circuit to give the supply to an external circuit. Due to absence of rotating devices they are quite simple and efficient in nature. This paper describes about the working methods of fuel cells and their future and economic growth. Keywords: Fuel cell, Electrolyte, Electrode, DC
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.
a device that converts the chemical energy from a fuel into electricity through a chemical reaction with oxygen or another oxidizing agent - from MSE-HUST k54
A short presentation for students
What is a Fuel Cell?
A fuel cell is a device that converts chemical energy into electrical energy, water, and heat through electrochemical reactions.
Why to use fuel cell ?
our society is dependent upon fossil fuels such as coal, oil and gas
fossil fuels are a non-renewable energy resource
fuel prices are rising and resources dwindling
food, transport and electricity costs are affected by fuel prices
the atmosphere is becoming more and more polluted
carbon dioxide contributes to climate change and the greenhouse effect
There are 4 main parts
Anode
Cathode
Catalyst
Proton exchange membrane
The types of fuel cells are:
Alkaline fuel cells (AFC)
Solid oxide fuel cells (SOFC)
Phosphoric Acid Fuel Cell (PAFC)
Proton Exchange Membrane Fuel Cells (PEMFC)
Molten Carbonate fuel cells (MFFC)
Direct methanol fuel cells (DMFC)
Performance of Six-Pulse Line-Commutated Converter in DC Motor Drive ApplicationZunAib Ali
This paper presents the speed control of DC motor using six pulse controlled rectifier. The
conventional Proportional Integral (PI) control is used for firing angle control. The armature current is fed
back and compared with reference current representing desired speed values. The proposed system is
simulated using SimPowerSystem and Control System Matlab toolbox. The time domain plot of reference
and actual armature current are shown in results section. The results are satisfactory with deleterious effect
on input current. The frequency plot of input current is provided to show the harmonic contents, generated
as a result of control operation.
A complete description of including circuit diagram, gain equation, features of Instrumentational amplifier , its working principle, applications, practical circuits, Proteus simulation and conclusion.
Uet, Peshawar Pakistan
Batch-06
LCL Filter for Grid Connected VSC Converter
Comprehensive analysis and modeling of the three-phase LCL filter for VSC converters, suitable for wind energy or photovoltaic applications.
Sinusoidal PWM and Space Vector Modulation For Two Level Voltage Source Conve...ZunAib Ali
Complete detail of Sinusoidal PWM and Space Vector Modulation For Two Level Voltage Source Converter
Space Vector Modulation includes:
Switching states, space vector, space vector diagram, space vector and switching states relationship, Dwell time, switching sequence
Concept of energy transmission & distribution ZunAib Ali
Downlaod is NOW Allowed (08/06/2016)
for more help: email me at zunaib_91@yahoo.com
Purpose of Electrical Transmission System
Main Parts of Power System
One-Line Diagram of Generating Station
Main Parts of Generating Station
Components of a Transmission Line
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Delivering Micro-Credentials in Technical and Vocational Education and TrainingAG2 Design
Explore how micro-credentials are transforming Technical and Vocational Education and Training (TVET) with this comprehensive slide deck. Discover what micro-credentials are, their importance in TVET, the advantages they offer, and the insights from industry experts. Additionally, learn about the top software applications available for creating and managing micro-credentials. This presentation also includes valuable resources and a discussion on the future of these specialised certifications.
For more detailed information on delivering micro-credentials in TVET, visit this https://tvettrainer.com/delivering-micro-credentials-in-tvet/
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Thinking of getting a dog? Be aware that breeds like Pit Bulls, Rottweilers, and German Shepherds can be loyal and dangerous. Proper training and socialization are crucial to preventing aggressive behaviors. Ensure safety by understanding their needs and always supervising interactions. Stay safe, and enjoy your furry friends!
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
MATATAG CURRICULUM: ASSESSING THE READINESS OF ELEM. PUBLIC SCHOOL TEACHERS I...NelTorrente
In this research, it concludes that while the readiness of teachers in Caloocan City to implement the MATATAG Curriculum is generally positive, targeted efforts in professional development, resource distribution, support networks, and comprehensive preparation can address the existing gaps and ensure successful curriculum implementation.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...
What is a fuel cell
1. What is a fuel cell?
A fuel cell is a device that generates electricity by a chemical reaction. Every fuel cell has two
electrodes, one positive and one negative, called, respectively, the anode and cathode. The
reactions that produce electricity take place at the electrodes.
Every fuel cell also has an electrolyte, which carries electrically charged particles from one
electrode to the other, and a catalyst, which speeds the reactions at the electrodes.
Hydrogen is the basic fuel, but fuel cells also require oxygen. One great appeal of fuel cells is
that they generate electricity with very little pollution–much of the hydrogen and oxygen used in
generating electricity ultimately combines to form a harmless byproduct, namely water.
How do fuel cells work?
The purpose of a fuel cell is to produce an electrical current that can be directed outside the cell
to do work, such as powering an electric motor or illuminating a light bulb or a city. Because of
the way electricity behaves, this current returns to the fuel cell, completing an electrical
circuit. The chemical reactions that produce this current are the key to how a fuel cell works.
There are several kinds of fuel cells, and each operates a bit differently. But in general terms,
hydrogen atoms enter a fuel cell at the anode where a chemical reaction strips them of their
electrons. The hydrogen atoms are now "ionized," and carry a positive electrical charge. The
negatively charged electrons provide the current through wires to do work. If alternating current
(AC) is needed, the DC output of the fuel cell must be routed through a conversion device called
an inverter.
2. Figure 1: hydrogen atoms are now "ionized," and carry a positive electrical charge
Oxygen enters the fuel cell at the cathode and, in some cell types (like the one illustrated above),
it there combines with electrons returning from the electrical circuit and hydrogen ions that have
traveled through the electrolyte from the anode. In other cell types the oxygen picks up electrons
and then travels through the electrolyte to the anode, where it combines with hydrogen ions.
The electrolyte plays a key role. It must permit only the appropriate ions to pass between the
anode and cathode. If free electrons or other substances could travel through the electrolyte, they
would disrupt the chemical reaction.
Whether they combine at anode or cathode, together hydrogen and oxygen form water, which
drains from the cell. As long as a fuel cell is supplied with hydrogen and oxygen, it will generate
electricity.
Even better, since fuel cells create electricity chemically, rather than by combustion, they are not
subject to the thermodynamic laws that limit a conventional power plant. Therefore, fuel cells are
more efficient in extracting energy from a fuel. Waste heat from some cells can also be
harnessed, boosting system efficiency still further.
3. Different types of fuel cells.
The following list describes the five main types of fuel cells.
1. Alkali fuel cells
Alkali fuel cells operate on compressed hydrogen and oxygen. They generally use a
solution of potassium hydroxide (chemically, KOH) in water as their electrolyte.
Efficiency is about 70 percent, and operating temperature is 150 to 200 degrees C, (about
300 to 400 degrees F). Cell output ranges from 300 watts (W) to 5 kilowatts (kW). Alkali
cells were used in Apollo spacecraft to provide both electricity and drinking water. They
require pure hydrogen fuel, however, and their platinum electrode catalysts are
expensive. And like any container filled with liquid, they can leak.
Fig. 2: Alkali Fuel Cell
2. Molten Carbonate fuel cells
Molten Carbonate fuel cells (MCFC) use high-temperature compounds of salt (like
sodium or magnesium) carbonates (chemically, CO3) as the electrolyte. Efficiency ranges
from 60 to 80 percent, and operating temperature is about 650 degrees C (1,200 degrees
F). Units with output up to 2 megawatts (MW) have been constructed, and designs exist
for units up to 100 MW. The high temperature limits damage from carbon monoxide
4. "poisoning" of the cell and waste heat can be recycled to make additional electricity.
Their nickel electrode-catalysts are inexpensive compared to the platinum used in other
cells. But the high temperature also limits the materials and safe uses of MCFCs–they
would probably be too hot for home use. Also, carbonate ions from the electrolyte are
used up in the reactions, making it necessary to inject carbon dioxide to compensate.
Fig. 3: Molten Carbonate Fuel Cell
3. Phosphoric Acid fuel cells
Phosphoric Acid fuel cells (PAFC) use phosphoric acid as the electrolyte. Efficiency
ranges from 40 to 80 percent, and operating temperature is between 150 to 200 degrees C
(about 300 to 400 degrees F). Existing phosphoric acid cells have outputs up to 200 kW,
and 11 MW units have been tested. PAFCs tolerate a carbon monoxide concentration of
about 1.5 percent, which broadens the choice of fuels they can use. If gasoline is used, the
sulfur must be removed. Platinum electrode-catalysts are needed, and internal parts must
be able to withstand the corrosive acid.
5. Fig. 4: Phosphoric Acid fuel cells
4. Proton Exchange Membrane (PEM) fuel cells
Proton Exchange Membrane (PEM) fuel cells work with a polymer electrolyte in the
form of a thin, permeable sheet. Efficiency is about 40 to 50 percent, and operating
temperature is about 80 degrees C (about 175 degrees F). Cell outputs generally range
from 50 to 250 kW. The solid, flexible electrolyte will not leak or crack and these cells
operate at a low enough temperature to make them suitable for homes and cars. But their
fuels must be purified, and a platinum catalyst is used on both sides of the membrane,
raising costs.
5. Solid Oxide fuel cells (SOFC)
Solid Oxide fuel cells (SOFC) use a hard, ceramic compound of metal (like calcium or
zirconium) oxides (chemically, O2) as electrolyte. Efficiency is about 60 percent, and
operating temperatures are about 1,000 degrees C (about 1,800 degrees F). Cells output is
up to 100 kW. At such high temperatures a reformer is not required to extract hydrogen
from the fuel, and waste heat can be recycled to make additional electricity. However, the
high temperature limits applications of SOFC units and they tend to be rather large.
While solid electrolytes cannot leak, they can crack.
6. Fig. 5: Solid Oxide fuel cells (SOFC)
Are fuel cells renewable or nonrenewable?
Fuels cell can be renewable or nonrenewable resources. A fuel cell is an electrochemical device
that generates electricity from hydrogen. You can get hydrogen from various sources such as
nonrenewable fossil fuels (natural gas, coal, petroleum, etc.) or renewable resources such as
water or anaerobic digester gas (ADG). There are a few solar and wind-powered electrolyzers
that generate hydrogen from water, which is renewable. Fuel cells that use alcohol, methane
from waste digestion, and hydrogen from wind or solar conversion of water are renewable. Fuel
cells that use hydrogen or methane from oil and gas production and alcohol from industrial
processes are nonrenewable.