过电位
材料科学
双功能
非阻塞I/O
化学工程
催化作用
石墨烯
合金
贵金属
基质(水族馆)
分解水
纳米技术
冶金
复合材料
金属
电化学
化学
物理化学
电极
海洋学
地质学
工程类
生物化学
光催化
作者
Hualong Ding,Le Xu,Congtao Wen,Jiao–Jiao Zhou,Li Kuang,Peilin Zhang,Linping Wang,Weiwei Wang,Wanqing Wang,Xicheng Xu,Wuxing Ji,Yang Yang,Luyang Chen
标识
DOI:10.1016/j.cej.2022.135847
摘要
Designing high-efficiency and durable non-noble metal catalysts is essential for the large-scale application of electrocatalytic water splitting. Herein, MoNi alloy nanograins are embedded in Mo-doped NiO nanosheets by partial reduction treatment, which vertically grow on three-dimensional (3D) nitrogen-doped graphene foam substrate ([email protected]@NGF). The hybrid composite demonstrates superb bifunctional electrocatalytic activity towards hydrogen/oxygen evolution reactions. Especially, it possesses the ultra-low hydrogen evolution overpotential of 56 mV at the current density of 10 mA cm−2 in alkaline condition. The excellent catalytic activity and remarkable stability can be attributed to the optimized surface electronic structure of MoNi alloy by Mo doping, the synergy interface interaction between MoNi nanograins and Mo-NiO substrate, and the high conductivity and corrosion resistance of NGF support. Thus, this work provides a new strategy for the high-performance catalyst towards overall water splitting by the dual regulation of surface and interface.
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