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Porous Ni−Mo−S Nanowire Network Film Electrode as a High‐Efficiency Bifunctional Electrocatalyst for Overall Water Splitting
Author(s) -
Ma Zizai,
Meng Huijie,
Wang Mei,
Tang Bin,
Li Jinping,
Wang Xiaoguang
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700965
Subject(s) - overpotential , oxygen evolution , electrocatalyst , water splitting , bifunctional , materials science , nickel , chemical engineering , alkaline water electrolysis , catalysis , electrolysis , electrochemistry , inorganic chemistry , electrode , nanowire , electroplating , nanotechnology , chemistry , metallurgy , electrolyte , layer (electronics) , biochemistry , photocatalysis , engineering
Developing noble‐metal‐free electrocatalysts with excellent activity and stability for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is essential for promoting the generation of H 2 by electrocatalytic water splitting. Herein, a novel 3D self‐supported Ni−Mo−S nanowire network film electrode was prepared by facile electroplating nickel−molybdenum on nickel foam followed by sulfurization as bifunctional catalysts for both HER and OER. Electrochemical measurements reveal that superb high catalytic activity and durability is acquired on the Ni−Mo−S electrode, which can afford an electrocatalytic current density of 100 mA cm −2 with an overpotential of 290 mV for the HER and an overpotential of 390 mV for the OER in alkaline medium. Coupled with the superior and robust OER catalytic activity, an alkaline electrolyzer that can achieve 100 mA cm −2 at a cell voltage of 2.0 V was constructed by applying Ni−Mo−S||Ni−Mo−S for overall water splitting, thus indicating a homogeneous, cost‐effective, and earth‐abundant material system for highly efficient H 2 production.