Abstract
AbstractThe overpotential of carbon monoxide (CO) fuel was analyzed with a 100‐cm2 class molten carbonate fuel cell. The overpotential at the anode was measured using the steady state polarization, inert gas step addition, and reactant gas addition methods. Then, the overpotential was compared between normal hydrogen fuel (H2:CO2:H2O = 0.69:0.17:0.14 atm, inlet composition) and CO fuels (CO:CO2:H2O = 0.5:0.5:0 atm and 0.43:0.43:0.14 atm, inlet compositions). The CO fuel without H2O showed a much greater overpotential at 150 mA cm–2 than the CO fuel with H2O. This implies that the water‐gas‐shift reaction prevails at the anode and humidification of CO fuel is an efficient way to reduce anodic overpotential. The anodic overpotential with CO:CO2:H2O = 0.43:0.43:0.14 atm was about 73% of that of the H2 fuel at 150 mA cm–2. The anode showed gas‐phase mass‐transfer limitations with CO fuels.
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