High activity of carbon nanotubes supported binary and ternary Pd-based catalysts for methanol, ethanol and formic acid electro-oxidation

被引:149
作者
Zhu, Fuchun [1 ]
Ma, Guanshui [1 ]
Bai, Zhongchao [1 ]
Hang, Ruiqiang [1 ]
Tang, Bin [1 ]
Zhang, Zhonghua [2 ]
Wang, Xiaoguang [1 ]
机构
[1] Taiyuan Univ Technol, Res Inst Surface Engn, Taiyuan 030024, Peoples R China
[2] Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Palladium; Electrocatalyst; Multi-walled carbon nanotubes; Electro-oxidation; Methanol; Formic acid; OXYGEN REDUCTION REACTION; DEALLOYED PT-CU; ELECTROCATALYTIC ACTIVITY; NANOPARTICLE ELECTROCATALYSTS; ELECTROCHEMICAL ACTIVITY; SURFACE-AREA; ALKALINE; OXIDATION; ALLOY; CO;
D O I
10.1016/j.jpowsour.2013.05.145
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, we have synthesized a series of multi-walled carbon nanotubes supported Pd, PdCu(molar ratio 1:1), PdSn(1:1) and PdCuSn(1:1:1) catalysts by chemical reduction with NaBH4 as a reducing agent. These catalysts are characterized using X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy (XPS), cyclic voltammetry and chronoamperometry. During the potential cycling activation, it is found that the additive Cu is prone to suffer leaching while the dissolution of Sn rarely occurs. Electrochemical measurements demonstrate that, the co-alloying of Pd with Cu and Sn can trigger the best catalytic activity enhancement as compared with the binary PdCu/CNTs, PdSn/CNTs and mono-component Pd/CNTs catalysts. The PdCuSn/CNTs reveals the most excellent activities toward methanol, ethanol and formic acid electro-oxidation and the corresponding mass activity can attain to 395.94, 872.70 and 534.83 mA mg(-1) Pd, respectively. The possible promotion effect of additive Sn or/and Cu on the electrocatalytic activity improvement is also analyzed. (c) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:610 / 620
页数:11
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