Electrocatalytic oxidation of formic acid at an ordered intermetallic PtBi surface

被引:171
作者
Casado-Rivera, E [1 ]
Gál, Z [1 ]
Angelo, ACD [1 ]
Lind, C [1 ]
DiSalvo, FJ [1 ]
Abruña, HD [1 ]
机构
[1] Cornell Univ, Baker Lab, Dept Chem & Biol Chem, Ithaca, NY 14853 USA
关键词
electrocatalysis; electrochemistry; metals; oxidation surfaces;
D O I
10.1002/cphc.200390030
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:193 / 199
页数:7
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