TiO2 nanotube supported PdNi catalyst for methanol electro-oxidation
TiO2 nanotube supported PdNi catalyst for methanol electro-oxidation
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DOI：
10.1016/j.powtec.2012.06.046
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发表时间：
2012-11-01
影响因子：
5.2
通讯作者：
Wu, Donghui
中科院分区：
文献类型：
--
作者：
Ju, Jianfeng;Shi, Yujun;Wu, Donghui
以PdCl2和NiSO4为前驱体，以多孔的二氧化钛纳米管为载体，采用表面还原沉积法制备了新型的PdNi/二氧化钛纳米管电催化剂。用X射线衍射仪、透射电子显微镜和电化学分析对PdNi/TiO2纳米管催化剂的结构和电化学性质进行了表征。实验结果表明，二氧化钛纳米管具有较大的比表面积和多孔结构，有利于纳米PdNi在二氧化钛纳米管载体表面的分散。在1mol L-1CH3OH和1mol L-1H2SO4溶液中的循环伏安曲线表明，正向不可逆扫描的大氧化峰电位约为0.94V，反向扫描的甲醇氧化的另一个锐化峰电位为0.85V，远大于标准PtRu/C催化剂，PdNi/Ti02纳米管电催化剂对甲醇电氧化的催化活性高于标准PtRu/C催化剂。PdNi/TiO2纳米管催化剂的甲醇氧化机理主要取决于TiO2光催化机理以及PdNi双金属与载体纳米管之间的协同作用。PdNi/Ti02纳米管催化剂有望成为直接甲醇燃料电池的候选催化剂。(C)2012爱思唯尔B.V.保留所有权利。
A novel PdNi/TiO2 nanotube electrocatalyst was successfully prepared by the surface reductive deposition method using the PdCl2 and NiSO4 as precursors and porous TiO2 nanotube as carrier. The structural and electrochemical properties of the PdNi/TiO2 nanotube catalyst were characterized by XRD, TEM and electrochemical analysis. The experiments results showed that TiO2 nanotube had large surface area and porous structure that is preferable to the dispersion of nanosized PdNi on the surface of the TiO2 nanotube support. The cyclic voltammograms in 1 mol L-1 CH3OH and 1 mol L-1 H2SO4 showed that the large oxidation peak potential was about 0.94 V on the positive irreversible scan and another acute peak of methanol oxidation was 0.85 V on the reverse scan that was much bigger than that of the standard PtRu/C catalyst, the PdNi/TiO2 nanotube electrocatalyst had higher catalytic activity for methanol electro-oxidation than standard PtRu/C catalyst. The methanol oxidation mechanism of the PdNi/TiO2 nanotube catalyst was mainly depended on the photocatalytic mechanism of TiO2 and the synergistic effect between PdNi bimetal and the carrier TiO2 nanotube. The PdNi/TiO2 nanotube catalyst should be a promising candidate for direct methanol fuel cell. (C) 2012 Elsevier B.V. All rights reserved.