High-Performance Bismuth-Doped Nickel Aerogel Electrocatalyst for the Methanol Oxidation Reaction
High-Performance Bismuth-Doped Nickel Aerogel Electrocatalyst for the Methanol Oxidation Reaction
复制标题
用于甲醇氧化反应的高性能铋掺杂镍气凝胶电催化剂
DOI：
10.1002/anie.202004314
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发表时间：
2020-06-03
影响因子：
16.6
通讯作者：
Liu, Wei
中科院分区：
文献类型：
--
作者：
Dubale, Amare Aregahegn;Zheng, Yuanyuan;Liu, Wei
直接甲醇燃料电池需要低成本的非贵金属电催化剂，但其发展受到活性有限、高起始电位、低电导率和差耐久性的阻碍。提出了一种表面电子结构调整策略，该策略涉及将外来亲氧后过渡金属掺杂到过渡金属气凝胶上，以实现非贵金属气凝胶Ni 97 Bi 3在甲醇氧化中具有前所未有的电催化活性和耐久性。微量的Bi原子分散在Ni 97 Bi 3气凝胶的表面上，这导致Ni的d-带中心的最佳移位，Bi的大压缩应变，和气凝胶的导电性大大增加。该电催化剂具有丰富的活性中心、高效的电子传递和传质、抗CO中毒等特点，在甲醇氧化反应中表现出优异的性能。这项工作揭示了高性能的非贵金属电催化剂的设计。
Low-cost, non-noble-metal electrocatalysts are required for direct methanol fuel cells, but their development has been hindered by limited activity, high onset potential, low conductivity, and poor durability. A surface electronic structure tuning strategy is presented, which involves doping of a foreign oxophilic post-transition metal onto transition metal aerogels to achieve a non-noble-metal aerogel Ni97Bi3 with unprecedented electrocatalytic activity and durability in methanol oxidation. Trace amounts of Bi are atomically dispersed on the surface of the Ni97Bi3 aerogel, which leads to an optimum shift of the d-band center of Ni, large compressive strain of Bi, and greatly increased conductivity of the aerogel. The electrocatalyst is endowed with abundant active sites, efficient electron and mass transfer, resistance to CO poisoning, and outstanding performance in methanol oxidation. This work sheds light on the design of high-performance non-noble-metal electrocatalysts.