Adsorption and Oxidation of Methanol on Pt and Sb, S Modified Pt Electrodes Using Cyclic Voltammetry and EQCM

Authors

Guo-liang CHEN, Dept. of Chem., Zhangzhou Normal College, Zhangzhou 363000, China;
Sheng-pei CHEN, State Key Lab. for Phys. Chem. of Solid Surfaces, Dept. of Chem., Xiamen Univ., Xiamen 36;
Heng Lin, Dept. of Chem., Zhangzhou Normal College, Zhangzhou 363000, China;
Xing-hong ZHENG, Dept. of Chem., Zhangzhou Normal College, Zhangzhou 363000, China;
Shi-gang SUN, State Key Lab. for Phys. Chem. of Solid Surfaces, Dept. of Chem., Xiamen Univ., Xiamen 36;

Abstract

The processes of adsorption and oxidation of methanol on Pt, Pt/Sb ad and Pt/S ad electrodes were studied by using cyclic voltammetry and electrochemical quartz crystal microba_lance (EQCM). The results demonstrated that the oxidation of methanol depends strongly on oxidation states of electrode surface. Sb adatoms on Pt surface can adsorb oxygen at relatively low potentials, and exhibit catalytic effects for methanol oxidation. In contrast to Pt electrodes, the oxidation peak potential of methanol in this case negatively shifted to about 130 mV. In a contrary, the oxidation of S adatoms consumes oxygen species of Pt electrode surface. As a consequence, the oxidation of methanol was inhibited by the presence of S ad . The EQCM studies provided quantitative results of surface mass variation during methanol oxidation, and have thrown new light in elucidating different effects of adatoms Sb ad and S ad on Pt electrode surface towards methanol oxidation.

Keywords

EQCM, Pt, Sb ad, S ad, Methanol

DOI Link

https://doi.org/10.61558/2993-074X.1438

Publication Date

2001-11-28

Online Available Date

2001-11-28

Revised Date

2001-11-28

Received Date

2001-11-28

Recommended Citation

Guo-liang CHEN, Sheng-pei CHEN, Heng Lin, Xing-hong ZHENG, Shi-gang SUN. Adsorption and Oxidation of Methanol on Pt and Sb, S Modified Pt Electrodes Using Cyclic Voltammetry and EQCM[J]. Journal of Electrochemistry, 2001 , 7(4): 452-458.
DOI: 10.61558/2993-074X.1438
Available at: https://jelectrochem.xmu.edu.cn/journal/vol7/iss4/6

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