Electrochemical deposition of Pt-Ru on diamond electrodes for the electrooxidation of methanol
Electrochemical deposition of Pt-Ru on diamond electrodes for the electrooxidation of methanol
复制标题
DOI：
10.1016/j.jelechem.2011.01.034
复制
发表时间：
2011-05-01
影响因子：
4.5
通讯作者：
Wang, Qiang
中科院分区：
文献类型：
--
作者：
Lu, Xiao;Hu, Jingping;Wang, Qiang
研究了负载在掺硼金刚石电极上的Pt-Ru合金纳米粒子对甲醇氧化的电催化性能与电沉积条件的关系。涉及顺序和同时沉积的两种元素的路线进行了研究，沉积电位的影响也进行了检查。的电沉积物的形态，其特征在于通过扫描电子显微镜，并显示球形Pt-Ru纳米粒子的同时沉积和树枝状结构的顺序沉积。两种沉积方法制备的Pt-Ru二元催化剂都比单独使用Pt具有更高的电催化活性。然而，同时沉积的沉积物显示出更高的化学稳定性和催化活性，甲醇氧化比那些使用顺序沉积，其中显着的电溶解的Ru是一个问题。在同时沉积中的最佳Pt：Ru比率被认为是中间沉积电位。两种沉积方法的不同形态和微观结构也反映在从塔菲尔分析判断的甲醇氧化的不同速率决定步骤中。总的来说，一个敏感的依赖电沉积参数的催化性能。(C)2011爱思唯尔有限公司版权所有。
The dependence of the electrocatalytic properties of Pt-Ru alloy nanoparticles supported on boron-doped diamond electrodes, on the electrodeposition conditions used to prepare them with respect to the oxidation of methanol was studied. Routes involving sequential and simultaneous deposition of the two elements were studied, and the effect of deposition potential was also examined. The morphology of the electrodeposits was characterized by scanning electron microscopy, and shows spherical Pt-Ru nanoparticles for simultaneous deposition and a dendritic structure for sequential deposition. The Pt-Ru binary catalysts from both deposition methods exhibit higher electrocatalytic activity than Pt alone. However, deposits from simultaneous deposition show higher chemical stability and catalytic activity for methanol oxidation than those prepared using sequential deposition, for which significant electrodissolution of Ru is a problem. The optimal Pt:Ru ratio in simultaneous deposition is seen for intermediate deposition potentials. The different morphologies and microstructures for the two deposition methods are also reflected in differing rate-determining steps for methanol oxidization as judged from Tafel analysis. Overall, a sensitive dependence of catalytic properties on electrodeposition parameters is indicated. (C) 2011 Elsevier B.V. All rights reserved.