Phosphoric Acid Fuel Cell 2016 Special Topics of Fuel cell Phosphoric Acid Fuel Cell Yeongbeom Park 2016. 06. 13 Prof. Young tae Kim Pusan National University

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

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 2016 Special Topics of Fuel cell

Research Background Different types of fuel cells 2016 Special Topics of Fuel cell

Research Background Major types of fuel cells 일본 1억3천만톤 한국 3백만톤 Parameter AFC PEMFC PAFC MCFC SOFC DCFC T,℃ <100 200-215 650 700-1000 650-900 Heat Output 60-70 150-200 500-600 600-900 500-800 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 2016 Special Topics of Fuel cell

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) 2016 Special Topics of Fuel cell

Phosphoric Acid Fuel Cell Development history 2016 Special Topics of Fuel cell

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) 2016 Special Topics of Fuel cell

Phosphoric Acid Fuel Cell Three main sections – fuel processor, stacks, & power conditioner 2016 Special Topics of Fuel cell

Phosphoric Acid Fuel Cell Application and experience 2016 Special Topics of Fuel cell

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) 2016 Special Topics of Fuel cell

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% 2016 Special Topics of Fuel cell

Phosphoric Acid Fuel Cell Failure modes 2016 Special Topics of Fuel cell

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) 2016 Special Topics of Fuel cell

Q & A 2016 Special Topics of Fuel cell