Highly active carbon supported ternary PdSnPt_x (x = 0.1-0.7) catalysts for ethanol electro-oxidation in alkaline and acid media

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• 作者：Xiaoguang Wang^a ; ^{wangxiaoguang@tyut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{wangxiaog1982@163.com" class="auth_mail" title="E-mail the corresponding author} ; Fuchun Zhu^a ; ^b ; Yongwei He^a ; Mei Wang^a ; Zhonghua Zhang^c ; Zizai Ma^a ; Ruixue Li^a
• 关键词：Palladium&ndash ; tin ; Platinum ; Electro-oxidation ; Ethanol ; Alkali and acid
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 April 2016
• 年：2016
• 卷：468
• 期：Complete
• 页码：200-210
• 全文大小：3628 K

文摘

A series of trimetallic PdSnPt_x (x = 0.1–0.7)/C catalysts with varied Pt content have been synthesized by co-reduction method using NaBH₄ as a reducing agent. These catalysts were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and chronoamperometry (CA). The electrochemical results show that, after adding a minor amount of Pt dopant, the resultant PdSnPt_x/C demonstrated more superior catalytic performance toward ethanol oxidation as compared with that of mono-/bi-metallic Pd/C or PdSn/C in alkaline solution and the PdSnPt0.2/C with optimal molar ratio reached the best. In acid solution, the PdSnPt0.2/C also depicted a superior catalytic activity relative to the commercial Pt/C catalyst. The possible enhanced synergistic effect between Pd, Sn/Sn(O) and Pt in an alloyed state should be responsible for the as-revealed superior ethanol electro-oxidation performance based upon the beneficial electronic effect and bi-functional mechanism. It implies the trimetallic PdSnPt0.2/C with a low Pt content has a promising prospect as anodic electrocatalyst in fields of alkali- and acid-type direct ethanol fuel cells.