Inhibition of sintering in molten carbonate fuel cell anodes
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Molten carbonate fuel cells operate at 600–700°C. At these high temperatures, high surface area nickel anodes lose their activity rapidly due to sintering. A study of the sintering kinetics of Ni, Ni-Ag and Ag powder revealed that when Ni and Ag particles are present in similar numbers, sintering is significantly inhibited. This is achieved by minimizing volume diffusion between adjacent particles — Ni and Ag have virtually no solid solubility at any temperature. Paste electrolyte cells using such electrodes gave 114 mA/cm2 at 0.65 V on 80% H2/20% CO2 fuel, compared to 80 mA/cm2 at 0.65 V for a cell using sintered nickel anodes.
KeywordsNickel Fuel Cell High Surface High Surface Area Solid Solubility
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