双金属片
材料科学
异质结
析氧
催化作用
电化学
电流密度
合金
化学工程
冶金
光电子学
电极
化学
物理化学
金属
生物化学
物理
量子力学
工程类
作者
Jiaxin Yuan,Xiaodi Cheng,Hanqing Wang,Chaojun Lei,Sameer Pardiwala,Bin Yang,Qinghua Zhang,Lecheng Lei,Shaobin Wang,Yang Hou
标识
DOI:10.1007/s40820-020-00442-0
摘要
Abstract Cost-effective and stable electrocatalysts with ultra-high current densities for electrochemical oxygen evolution reaction (OER) are critical to the energy crisis and environmental pollution. Herein, we report a superaerophobic three dimensional (3D) heterostructured nanowrinkles of bimetallic selenides consisting of crystalline NiSe 2 and NiFe 2 Se 4 grown on NiFe alloy (NiSe 2 /NiFe 2 Se 4 @NiFe) prepared by a thermal selenization procedure. In this unique 3D heterostructure, numerous nanowrinkles of NiSe 2 /NiFe 2 Se 4 hybrid with a thickness of ~ 100 nm are grown on NiFe alloy in a uniform manner. Profiting by the large active surface area and high electronic conductivity, the superaerophobic NiSe 2 /NiFe 2 Se 4 @NiFe heterostructure exhibits excellent electrocatalytic activity and durability towards OER in alkaline media, outputting the low potentials of 1.53 and 1.54 V to achieve ultra-high current densities of 500 and 1000 mA cm −2 , respectively, which is among the most active Ni/Fe-based selenides, and even superior to the benchmark Ir/C catalyst. The in-situ derived FeOOH and NiOOH species from NiSe 2 /NiFe 2 Se 4 @NiFe are deemed to be efficient active sites for OER.
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