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228 presentation iit bombay new
1. Structural, morphological and thermo gravimetric analysis of
spray pyrolysed Y doped BaCeO3 (BCY) thin films
By
Snehal U. Dubal
Under the guidance
Prof. C. H. Bhosale & Dr. L. D. Jadhav
Department of Physics, Shivaji University, Kolhapur
- 416 004, India
2. Outline of Presentation
1. INTRODUCTION
2. EXPERIMENTAL
BCY – perovskite structure
Synthesis of Yttrium doped Barium Cerate (BCY) thin films by
Spray pyrolysis technique
3. RESULTS AND DICUSSION
Thermo gravimetric analysis
XRD studies
Morphological studies
DC- Conductivity
• 4. CONCLUSIONS
3. Introduction of fuel cell and types of fuel Cell
Fuel cell type
Polymer
electrolyte
membrane fuel
cell (PEMFC)
Mobile Ion
H+
Operating
Temperature ◦C
50-100
Alkaline fuel
cell (AFC)
A fuel cell is an electrochemical energy
conversion device.
At Anode H2 → 2H+ + 2e−
At Cathode 1/2O2 +2e− 1/2 O2−
OH-
50-200
Phosphoric acid
fuel cell (PAFC)
H+
~220
CO32-
~650
O2- OR H+
500-1000
Molten
carbonate fuel
cell (MCFC)
Solid oxide fuel
cell (SOFC)
4. Advantages of SOFC
Higher efficiency.
Low cost electrode materials can be used instead of
expensive noble metals such as platinum.
A large variety of fuels can be used including natural
gas, biogas, methanol and ammonia.
Low degradation problem of cell components.
Easy to handle as all the components are in solid
form.
5. Chemicals and materials
BCY –perovskite structure
•
The different perovskite based materials have
been
explored
electrolyte
as
materials
proton
for
conducting
intermediate
temperature SOFCs .
•
Three basic materials are BaZrO3, SrZrO3
and BaCeO3.
•
10-2 to 7 x 10-2
Oxygen atom
Barium atom
BaCeO3 exhibits proton conductivity - 1.8 x
•
To
-1
cm-1
increase its conductivity and chemical
stability, it is doped with Yttrium at Ceria
Cerium atom
sites.
Yttrium atom
10. XRD patterns of BCY films annealed at different temperature
1000 °C
900 °C
800 °C
JCPDS card
No. 82-2372
Annealing Crystallite
Temp. °C Size nm
1000
b = 6.246 Å C = 6.216 Å
35
11
700
a = 8.873Å
900
800
700 °C
26
10
13. CONCLUSIONS
BCY20 thin electrolyte has been deposited by
economical spray pyrolysis technique.
The phase pure and dense film is obtained at
900 °C.
The maximum value of dc conductivity in
argon at 600 °C is 2.45 × 10−3 S cm−1.
This method could be extended to form thin
electrolyte based SOFC.
14. Acknowledgment
• I like to acknowledge the UGC for financial
assistance under RGN- fellowship.