in-situ electrochemical extended X-ray absorption fine structure spectroscopy study on the reactivation of Pd electrocatalyst in formic acid oxidation

被引：5

作者：

Jeon, Hongrae ^{[1
,2
]}

Jeong, Beomgyun ^{[1
]}

Choun, Myounghoon ^{[1
]}

Lee, Jaeyoung ^{[1
,3
]}

机构：

[1] GIST, Sch Environm Sci & Engn, Electrochem React & Technol Lab, Kwangju 500712, South Korea

[2] Korea Res Inst Chem Technol, Energy Mat Res Ctr, Taejon 305600, South Korea

[3] GIST, RISE, Ertl Ctr Elect & Catalysis, Kwangju 500712, South Korea

来源：

ELECTROCHIMICA ACTA | 2014年 / 140卷

基金：

新加坡国家研究基金会;

关键词：

Formic acid; Electro-oxidation; Palladium; Reactivation mechanism; in-situ electrochemical extended X-ray; absorption fine structure spectroscopy; FUEL-CELLS; PALLADIUM CATALYSTS; PLATINUM-ELECTRODES; HYDROGEN; HYDRIDE; ELECTROOXIDATION; EXAFS; FILMS;

D O I：

10.1016/j.electacta.2014.06.093

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Palladium (Pd) has been considered as an excellent option to replace platinum-based electrocatalysts in formic acid oxidation owing to its superb catalytic activity to Pt and cheaper material price. However, unstable catalytic activity of Pd is the most critical obstacle in the development of Pd-based electrocatalysts for formic acid oxidation, and the fundamental understanding on Pd deactivation is still incomplete. In this study, the activity of deactivated Pd in a formic acid oxidation was recovered to 93% by applying a cathodic bias potential of -0.2V vs. RHE. Based on in-situ electrochemical extended X-ray absorption fine structure spectroscopy analysis we show that cathodic polarization of Pd/C electrode could remove the adsorption of poisoning species by increasing bond length of Pd-Pd and further discuss on the origin of reactivation mechanism of Pd. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：525 / 528

页数：4

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