塔菲尔方程
过电位
催化作用
镍
无定形固体
材料科学
钨酸盐
纳米片
无机化学
电催化剂
电解水
氧化物
化学工程
钨
电解
化学
纳米技术
冶金
电解质
电化学
有机化学
电极
物理化学
工程类
作者
Jianpo Chen,Weidong He,Yingying Guo,Yuhang Xiao,Xiaohong Tan,Hao Cui,Chengxin Wang
标识
DOI:10.1016/j.jcis.2023.08.146
摘要
Noble metal free electrocatalysts for hydrogen evolution reaction (HER) in acid play an important role in proton exchange membrane-based electrolysis. Here, we develop an in situ surface self-reconstruction strategy to construct excellent acidic HER catalysts. Firstly, free-standing zinc nickel tungstate nanosheets inlaid with nickel tungsten alloy nanoparticles were synthesized on carbon cloth as pre-catalyst via metal–organic framework derived method. Amorphous nickel tungsten oxide (Ni-W-O) layer is in situ formed on surface of nanosheet as actual HER active site with the dissolution of NiW alloy nanoparticles and the leaching of cations. While the morphology of the free-standing structure remains the same, keeping the maximized exposure of active sites and serving as the electron transportation framework. As a result, benefiting from disordered arrangement of atoms and the synergistic effect between Ni and W atoms, the amorphous Ni-W-O layer exhibits an excellent acidic HER activity with only an overpotential of 46 mV to drive a current density of 10 mA cm−2 and a quite good Tafel slope of 36.4 mV dec−1 as well as an excellent durability. This work enlightens the exploration of surface evolution of catalysts during HER in acidic solution and employs it as a strategy for designing acidic HER catalysts.
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