Fabrication of Ag/Au/Pt Composite Catalysts and Their Electrocatalytic Oxidation for Formic Acid

doi:10.6023/A12030017

Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (20): 2149-2154.DOI: 10.6023/A12030017 Previous Articles Next Articles

Article

Ag/Au/Pt复合催化剂的制备及其对甲酸的电催化氧化

张强, 姚章权, 周蓉, 杜玉扣, 杨平

苏州大学材料与化学化工学部苏州 215123

投稿日期:2012-03-19 发布日期:2012-09-11
通讯作者: 杜玉扣 E-mail:duyk@suda.edu.cn
基金资助:
项目受国家自然科学基金(Nos. 51073114, 20933007)和江苏省高校优势学科建设工程(PAPD)资助.

Fabrication of Ag/Au/Pt Composite Catalysts and Their Electrocatalytic Oxidation for Formic Acid

Zhang Qiang, Yao Zhangquan, Zhou Rong, Du Yukou, Yang Ping

College of Chemistry and Chemical Engineering, Soochow University, Suzhou 215123

Received:2012-03-19 Published:2012-09-11
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 51073114, 20933007) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

1. Fabrication of Ag/Au/Pt Composite Catalysts and Their Electrocatalytic Oxidation for Formic Acid.PDF(59KB)

Abstract

Ag/Au/Pt composite catalyst has been fabricated by chemical and electrochemical methods. The catalyst is fabricated by the electrodeposition of 100 nm Ag nanoparticle, then Au is deposited by chemical reduction, and Pt is electrodeposited finally, the quantity of Au and Pt is reduced. The samples have been characterized by scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDX) and X-ray diffraction (XRD) techniques. In addition, the electrocatalytic performance of composite electrode materials is measured by cyclic voltammetry (CV) towards formic acid oxidation. The results demonstrate that the as-prepared Ag/Au/Pt composite catalyst with low Pt loading (0.71 μg/cm²) shows much higher catalytic activity than that of the same amount of pure Pt catalyst towards formic acid electrooxidation, and the current density of direct oxidation for formic acid reaches 4541.42 mA/mg. On the other hand, the content of Pt has a significant influence on formic acid oxidation path. It is found that formic acid electrooxidation on the Ag/Au/Pt composite catalyst mainly follows the direct oxidation path only when the atomic ratio of Pt∶Au is less than 1∶10. The enhanced performance is mainly due to the increase of electrochemical active surface area (EASA) through CVs in H₂SO₄ solution. Moreover, the Ag/Au/Pt composite catalyst exhibits greater poisoning tolerance than that of pure Pt during formic acid electrooxidation, shown in the results of chronoamperometre (CA) measurement. The stability of composite catalyst is evaluated via recording the CV scans of 100 cycles of electrodes towards formic acid oxidation. At the 100th cycle, the current density of Ag/Au/Pt electrode just decreases 2.29%, which is far lower compared with the other electrodes. The CO stripping voltammogram in acid medium is recorded as well. The results show clearly that the CO stripping peak position of composite catalyst shifts negatively compared with that of the pure Pt catalyst in the mass. When the atomic ratio of Pt∶Au is 1∶6.0, the composite catalyst presents lowest peak potential for CO electrooxidation.

Key words: composite catalyst, formic acid, electrocatalysis, direct oxidation, CO stripping

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Zhang Qiang, Yao Zhangquan, Zhou Rong, Du Yukou, Yang Ping. Fabrication of Ag/Au/Pt Composite Catalysts and Their Electrocatalytic Oxidation for Formic Acid[J]. Acta Chimica Sinica, 2012, 70(20): 2149-2154.

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Ag/Au/Pt复合催化剂的制备及其对甲酸的电催化氧化

Fabrication of Ag/Au/Pt Composite Catalysts and Their Electrocatalytic Oxidation for Formic Acid

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