Abstract
The Pt/C catalyst of polymer electrolyte membrane fuel cell (PEMFC) was poisoned by 5 ppm of hydrogen sulfide for 5 hours at potentials of 0V, 0.3V, 0.6V and 0.9V vs. RHE, and the catalyst was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS) analysis. Only diffraction peaks of Pt, carbon and ionomer were observed in all samples, and the crystallite size of Pt was about the same after poisoning. In the XPS and XAFS analyses, accumulation of sulfur species on Pt/C catalyst and oxidation of Pt were observed in the samples poisoned at 0.3V and 0.6V.
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