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Fabrication of NiC/MoC/NiMoO 4 Heterostructured Nanorod Arrays as Stable Bifunctional Electrocatalysts for Efficient Overall Water Splitting
Author(s) -
Geng Shuo,
Yang Weiwei,
Yu Yongsheng
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201801871
Subject(s) - electrocatalyst , water splitting , oxygen evolution , bifunctional , materials science , catalysis , electrolysis , electrolysis of water , electrochemistry , nanorod , chemical engineering , nanotechnology , electrode , chemistry , electrolyte , photocatalysis , biochemistry , engineering
Developing noble‐metal‐free, earth‐abundant, highly active, and stable electrocatalysts with high efficiency for both hydrogen and oxygen evolution reactions is of great importance for the development of overall water‐splitting devices, but still remains a challenging issue. Herein, a 3D heterostructured NiC/MoC/NiMoO 4 electrocatalyst was prepared through a facile synthetic procedure. The electrocatalyst shows a superior catalytic activity and stability toward the hydrogen and oxygen evolution reactions. The optimized NiC/MoC/NiMoO 4 catalyst presents low overpotentials of 68 and 280 mV to reach a current density of 10 mA cm −2 in 1.0 m KOH for the hydrogen and oxygen evolution reactions, respectively. Assembled as an electrolyzer for overall water splitting, such a heterostructure shows quite a low cell voltage of 1.52 V at 10 mA cm −2 and remarkable stability for more than 20 h. This work provides a facile but efficient approach for the design and preparation of highly efficient bifunctional and self‐supported heterostructured electrocatalysts that can serve as promising candidates in electrochemical energy storage and conversion.