Influence of temperature on the anode reaction in a molten carbonate fuel cell
Abstract Anode reaction characteristics in a molten carbonate fuel cell (MCFC) have been investigated in terms of overpotential by varying the temperature for 100cm 2 class single cells. The temperature range was from 823 to 973K under atmospheric conditions. Anodic overpotential was measured with the methods of electrochemical impedance spectroscopy (EIS), inert gas step addition (ISA), and reactant gas addition (RA). The cells successfully showed anodic overpotential at the very extreme temperatures of 823 and 973K. The results of EIS and ISA revealed that anodic overpotential rose when the temperature increased. This is attributed to the fact that mass-transfer resistance through the porous electrode, that is, pore diffusion resistance, was increased at higher temperature. When using the RA method, it was also found that enlarged mass-transfer resistance of the reaction species, H 2 , CO 2 , and H 2 O, was responsible for the increase in overpotential at higher temperatures. Highlights The anode has larger mass-transfer resistance at higher temperature. Impedance and other steady state polarization results showed identical behaviour. Similarity of anode reaction to the gas-solid catalyst reaction is suggested. Pore diffusion resistance can explain the anode mass transfer behaviour.
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