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High‐Performance Bismuth‐Doped Nickel Aerogel Electrocatalyst for the Methanol Oxidation Reaction
Authors:Amare Aregahegn Dubale  Yuanyuan Zheng  Honglei Wang  Ren Hübner  Yi Li  Jing Yang  Jiangwei Zhang  Navpreet Kaur Sethi  Lanqi He  Zhikun Zheng  Wei Liu
Institution:Amare Aregahegn Dubale,Yuanyuan Zheng,Honglei Wang,René Hübner,Yi Li,Jing Yang,Jiangwei Zhang,Navpreet Kaur Sethi,Lanqi He,Zhikun Zheng,Wei Liu
Abstract: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.
Keywords:aerogels  bismuth dopants  methanol oxidation  nickel  single atoms
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