1. Phosphoric Acid Fuel Cell
2016 Special Topics of Fuel cell
Phosphoric Acid Fuel Cell
Yeongbeom Park
Prof. Young tae Kim
Pusan National University

2. Contents Development history Phosphoric Acid Fuel Cell
Research Background 1
Phosphoric Acid Fuel Cell 2
Development history
Phosphoric Acid Fuel Cell
Application and experience
Failure modes
References 3
2016 Special Topics of Fuel cell

3. Research Background The Fuel cells 일본 1억3천만톤 한국 3백만톤
The theoretical efficiency of different fuels calculated from free energy of the fuel oxidation reaction as a function of temperature.
The basic operating principle of a fuel cell
Diagram showing fuel cell voltage, efficiency and power density plots versus current density
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4. Research Background Different types of fuel cells
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5. Research Background Major types of fuel cells 일본 1억3천만톤 한국 3백만톤
Parameter
AFC
PEMFC
PAFC
MCFC
SOFC
DCFC
T,℃
<100
650
Heat Output
60-70
Electrical efficiency(%)
45-60
40-45
45-55
40-50
>80
CHP efficiency(%)
>90
Thermal insulation
Low
Medium
High
Inthernal reforming
Not possible
Only with steam
not applicable
Electrolyte
KOH
PEM
H3PO4
Molten carbonate
O2 conducting ceramic
Molten carbonate/molten hydroxide/O2 conducting ceramic
Impurity sensitivity
CO2,CO,S
S,CO~20ppm
Sulphur
Unknown
Power at cold start
>50%
Nil
Thermal cycling
Unlimited
Good
Restricted
Start-up/Shut-down
Very fast(sec)
Slow(hrs)
Several hrs
Several hours
Load following
Excellent
Limited
BOP
Simple
Complex
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6. Research Background Dispersed type power source (small-scale building)
Using part of fuel cells
AFC
PAFC
MCFC
SOFC
SPEFC
Electronic & gas company X O
Industry(metal, chemistry etc.)
Heat combined generation
Commercial building
Residential building
Transporation part(bus, train)
Space ship
Military
Dispersed type power source (small-scale building)
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7. Phosphoric Acid Fuel Cell
Development history
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8. Phosphoric Acid Fuel Cell
Schemetic diagram of PAFC
< Reaction>
Anode :
H2  2H++2e-
Cathode :
1/2O2 + 2H++2e-  H2O
Totally :
H2+1/2O2  H2O
Nigel Sammes, Roberto Bove, Knut Stahl, Phosphoric acid fuel cells: Fundamentals and applications, Current Opinion in Solid State and Materials Science 8 (2004)
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9. Phosphoric Acid Fuel Cell
Three main sections – fuel processor, stacks, & power conditioner
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10. Phosphoric Acid Fuel Cell
Application and experience
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11. Phosphoric Acid Fuel Cell
Application and experience
Development of a 50kW PAFC power generation system
Schematic process flow diagram of 50kW PAFC pilot system
3. J.C. Yang, Y.S. Park, S.H. Seo, H.J Noh, Development of a 50kW PAFC power generation system, Journal of Power Sources 106 (2002)
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12. Phosphoric Acid Fuel Cell
Application and experience
Highly efficient heat recovery system for phosphoric acid fuel cells
200-kW fuel cell system used for cooling telecommunication equipment.
Electrical conversion efficiency – 40%
+ Heat recovery for the fuel-cell stack coolant – 17%
+ The exhaust gas by improving the heat exchanger – 21%
2. Maki Ishizawa, Shigeru Okada, Takashi Yamashita, Highly efficient heat recovery system for phosphoric acid fuel cells used for cooling telecommunication equipment, Journal of Power Sources 86 (2000)
Total efficiency - 78%
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13. Phosphoric Acid Fuel Cell
Failure modes
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14. Reference
P. Stoneheart, Development of alloy electrocatalysts for phosphoric
acid fuel cells (PAFC), JOURNAL OF APPLIED ELECTROCHEMISTRY 22
(1992)
2. Maki Ishizawa, Shigeru Okada, Takashi Yamashita, Highly efficient heat
recovery system for phosphoric acid fuel cells used for cooling
telecommunication equipment, Journal of Power Sources 86 (2000)
3. J.C. Yang, Y.S. Park, S.H. Seo, H.J Noh, Development of a 50kW PAFC
power generation system, Journal of Power Sources 106 (2002)
4. Brian C. H. Steele & Angelika Heinzel, Materials for fuel-cell technologies,
NATURE, VOL 414, 15 NOVEMBER 2001
5. Nigel Sammes, Roberto Bove, Knut Stahl, Phosphoric acid fuel cells:
Fundamentals and applications, Current Opinion in Solid State and
Materials Science 8 (2004)
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15. Q & A
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