PEFC Power Generation Performance Degradation by Hydrogen Sulfide and Ammonia—Effects of Lowering Platinum Loading—

概要

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Hydrogen for fuel cell vehicles is likely to contain impurities from its production process, and such impurities may poison the fuel cell catalyst, thus degrading the power generation performance of the polymer electrolyte fuel cell (PEFC) especially when the Platinum(Pt) loading is reduced. The effects of anode Pt loading on power generation performance degradation by H2S and NH3 in hydrogen fuel were investigated. The test results indicated that the lower the anode Pt loading, the more rapid the decrease in cell voltage under the influence of H2S in the hydrogen. The amount of H2S supplied to the cell until the cell voltage decreased by the same level (30 mV) was proportional to the anode Pt loading regardless of the hydrogen sulfide concentration. The cell voltage decrease by NH3 in the hydrogen was not dependent on the anode Pt loading, but was influenced by the cathode Pt loading.