Highly Branched Metal Alloy Networks with Superior Activities for the Methanol Oxidation Reaction
Highly Branched Metal Alloy Networks with Superior Activities for the Methanol Oxidation Reaction
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DOI：
10.1002/anie.201701149
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发表时间：
2017-04-10
影响因子：
16.6
通讯作者：
Lin, Zhiqun
中科院分区：
文献类型：
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作者：
Cui, Xun;Xiao, Peng;Lin, Zhiqun
三维（3D）互连的金属合金纳米结构由于其有利的特性（包括改进的催化活性、耐腐蚀性和稳定性）而具有上级催化性能。采用一种简单有效的析氢辅助电沉积方法制备了由三维网状微观分支和纳米级枝晶触角组成的分级结构Ni-Cu合金。随后，他们被利用在碱性介质中的甲醇电氧化。在3种不同Ni/Cu比的Ni-Cu合金（Ni0.25Cu0.75、Ni0.50Cu0.50和Ni0.75Cu0.25）中，Ni0.75Cu0.25电极对甲醇氧化具有最快的电化学响应和最高的电催化活性。Ni_（0.75）Cu_（0.25）电催化剂性能的显著提高是由于其具有合适的Ni/Cu比的合金化结构和大量的活性位存在于分级结构表面。
Three-dimensional (3D) interconnected metal alloy nanostructures possess superior catalytic performance owing to their advantageous characteristics, including improved catalytic activity, corrosion resistance, and stability. Hierarchically structured Ni-Cu alloys composed of 3D network-like microscopic branches with nanoscopic dendritic feelers on each branch were crafted by a facile and efficient hydrogen evolution-assisted electrodeposition approach. They were subsequently exploited for methanol electrooxidation in alkaline media. Among three hierarchically structured Ni-Cu alloys with different Ni/Cu ratios (Ni0.25Cu0.75, Ni0.50Cu0.50, and Ni0.75Cu0.25), the Ni0.75Cu0.25 electrode exhibited the fastest electrochemical response and highest electrocatalytic activity toward methanol oxidation. The markedly enhanced performance of Ni0.75Cu0.25 eletrocatalyst can be attributed to its alloyed structure with the proper Ni/Cu ratio and a large number of active sites on the surface of hierarchical structures.