期刊
FUEL CELLS
卷 11, 期 4, 页码 511-517出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/fuce.201000102
关键词
Adsorbate Orientation; Fuel Cells; HT PEM; Hysteresis; Phosphoric Acid Adsorption; Platinum Catalysts; Temperature Cycling
Dynamic testing of a phosphoric acid-based high temperature PEM fuel cell shows a peculiar phenomenon. A certain current loss is observed after temperature cycling at constant voltage. This loss is incidentally recovered by applying a cell voltage spike to open circuit voltage. Experimental investigations into temperature, cell voltage, and ageing effects show that this phenomenon might occur due to the orientation of the adsorbed phosphate species on the platinum catalyst surface. Along with some supporting literature and experimental results, a hypothesis is presented in order to explain this occurrence. Phosphoric acid adsorption hysteresis on platinum catalyst due to temperature cycling could cause the temporary cell current loss. Electrode potential-dependent molecule symmetry of adsorbed phosphate ions could bring about the cell current recovery.
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