期刊
CHEMPHYSCHEM
卷 4, 期 2, 页码 193-199出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200390030
关键词
electrocatalysis; electrochemistry; metals; oxidation surfaces
The electrocatalytic oxidation of formic acid at a PtBi ordered intermetallic electrode surface has been investigated using cyclic voltammetry, rotating disk electrode (RDE) voltammetry and differential electrochemical mass spectrometry (DEMS). The results are compared to those at a polycrystalline platinum electrode surface. The PtBi electrode exhibits superior properties when compared to polycrystalline platinum in terms of oxidation onset potential, current density and a much diminished poisoning effect by CO. Using the RDE technique, a value of 7.4 x 10(-4) cm s(-1) was obtained for the heterogeneous charge transfer rate constant. The PtBi surface did not appear to be poisoned when exposed to a CO saturated solution for periods exceeding 0.5 h. The results for PtBi are discussed within the framework of the dual-path mechanism for the electrocatalytic oxidation of formic acid, which involves formation of a reactive intermediate and a poisoning pathway.
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