In situ FTIRS studies of kinetics of HCOOH oxidation on Pt(110) electrode modified with antimony adatoms

被引：17
作者：
Yang, YY [1 ]
Zhou, ZY [1 ]
Sun, SG [1 ]
机构：
[1] Xiamen Univ, Dept Chem, Inst Phys Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China
来源：
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2001年 / 500卷 / 1-2期
基金：
中国国家自然科学基金;
关键词：
Pt(110); irreversible adsorption; Sb adatoms; HCOOH oxidation; kinetics; in situ FTIRS;
D O I：
10.1016/S0022-0728(00)00482-4
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The electrochemical behavior of irreversibly adsorbed antimony on a Pt(110) electrode (Pt(110)/Sb) with various coverages was studied using cyclic voltammetry. The kinetics of HCOOH oxidation via reactive intermediates on Pt(110)/Sb were investigated quantitatively by employing the potential step technique and in situ FTIR spectroscopy. The results demonstrated that Sb adatoms were stable on Pt(110) when the electrode potential was below 0.45 V (SCE). It has been revealed that the dissociative adsorption of formic acid can be inhibited by the presence of Sb-ad on the Pt(110) surface. The electrocatalytic effects of Sb-ad towards HCOOH oxidation consist in a negative shift of the oxidation potential (about 350 mV) and the enhancement of the oxidation current. Based on the data processing method of integration transform developed in our previous papers, the kinetics of HCOOH oxidation on Pt(110)/Sb electrodes of different theta (Sb) have been investigated quantitatively, and both the rate constant k(f) and the transfer coefficient beta were determined and reported. (C) 2001 Elsevier Science B.V. All rights reserved.
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页码：233 / 240
页数：8
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