Energy%20Materials%20Fuel%20cell%204th%20print

Energy%20Materials%20Fuel%20cell%204th%20print - Last class...

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1 Last class - Various types of fuel cells This class - Various types of fuel cells - Recent research trends in fuel cells
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2 Review last class! 1. The configuration of fuel cells is composed of bipolar plate, gasket, gas diffusion layer and MEA. 2. The electrolyte of PEMFC is proton-conducting polymer membrane. 3. Perovskites materials can be used as catalysts of SOFC, because it is operated at 600-1000 o C. 4. PEMFC can not be operated at >100 o C, because water in plymer membrane is evaporated and it is critical for proton- conduction. 5. What is the brand name of the proton-conductive polymer electrolyte by Dupont? Nafion
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3 6. DMFC uses a liquid methanol as a fuel instead of a H 2 gas. 7. PEMFC including DMFC uses Platinum as a catalyst, and so it causes a cost problem. It should be replaced by non-noble metals for commercialization of fuel cells. 8. The electrolyte of Alkaline fuel cells is KOH retained in silicate matrix. 9. The charge carrier of PEMFC is the proton. What is the charge carrier for alkaline fuel cells? OH - 10. Electrolyte determines the type of fuel cells and operation temperature.
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4 Various types of fuel cells
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5 Molten Carbonate Fuel Cell (MCFC) Besides the reaction involving H 2 and O 2 to produce H 2 O, the equation shows a transfer of CO 2 from the cathode gas stream to the anode gas stream, with 1 mole CO 2 transferred along with two Faradays of charge or 2 gram moles of electrons.
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6 • The electrolyte in this fuel cell is usually a combination of alkali carbonates, which is retained in a ceramic matrix of LiAlO 2 . The fuel cell operates at 600 to 700 o C where the alkali carbonates form a highly conductive molten salt, with carbonate ions providing ionic conduction. • The high operating temperature is needed to achieve sufficient conductivity of its carbonate electrolyte yet allow the use low cost metal cell components. At the high operating temperatures in MCFCs, Ni (anode) and nickel oxide (cathode) are adequate to promote reaction. Noble metals are not required. • Gasified coal is expected to be the major source of fuel gas for MCFCs. Because coal contains many contaminants in a wide range of concentrations, fuel derived from this source also contains a considerable number of contaminants. A critical concern with these contaminants is the concentration levels that can be tolerated by MCFCs without suffering significant degradation in performance or reduction in cell life. sulfur compounds in low ppm (parts per million) concentrations in fuel gas are detrimental to MCFCs
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7 Application of Molten Carbonate Fuel Cells (MCFC) • Molten carbonate fuel cells are being developed for natural gas and coal-based power plants for industrial, electrical utility, and military applications
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8 Solid Oxide Fuel Cell (SOFC)
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9 Solid Oxide Fuel Cell (SOFC) • Solid oxide fuel cells (SOFCs) have grown in recognition as a viable high temperature fuel cell technology. There is no liquid electrolyte with its attendant material corrosion and electrolyte management problems. The operating temperature of >800
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This note was uploaded on 11/29/2010 for the course ENERGY 12314142 taught by Professor Song during the Spring '10 term at 카이스트, 한국과학기술원.

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Energy%20Materials%20Fuel%20cell%204th%20print - Last class...

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