Kinetics and Characteristics of Electrocatalytic Oxidation of Formic Acid on Pt(110)/Sb Electrodes

Abstract

Abstract: The electrochemical behavior of irreversibly adsorbed antimony on Pt(110) was studied by using cyclic voltametry. The results demonstrated that the Sb_ad atoms are stable on Pt(110) when the electrode potentials are below 0.45 V( vs. SCE). We illustrated that various coverages of Sb_ad can be easily obtained by controlling the number of potential cycling and the upper limit of potential scan. It was found that the dissociative adsorption of formic acid was inhibited by the presence of Sb_ad on Pt(110) surface. The electrocatalytic effects of Sb_ad toward HCOOHelectrooxidation is demonstrated by the negative shift of oxidation potential(about 0.35 V) and the enhancement of oxidation current. The maximum current density was measured for a Sb coverage of 0.126. Based on methods developed in our previous papers, the kinetics of HCOOHelectrooxidation on Pt(110)/Sb electrodes of different θ_Sb has been studied, and both the rate constant k f and transfer coefficient β were determined quantitatively.

Key words: Pt(110) single crystal electrode, Sb irreversible adsorption, Sb_ad atoms, Kinetics of HCOOH electrooxidation

CLC Number:

O641

TrendMD:

YANG Yi-Yun, ZHOU Zhi-You, WU Qi-Hui, ZHENG Ming-Sen, GU Yan-Juan, CHENG Sheng-Pei, SUN Shi-Gang . Kinetics and Characteristics of Electrocatalytic Oxidation of Formic Acid on Pt(110)/Sb Electrodes[J]. Chem. J. Chinese Universities, 2001, 22(7): 1201.

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Kinetics and Characteristics of Electrocatalytic Oxidation of Formic Acid on Pt(110)/Sb Electrodes

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