Ultrathin MoS2 nanosheets in situ grown on rich defective Ni0.96S as heterojunction bifunctional electrocatalysts for alkaline water electrolysis

被引：55

作者：

Liu, Shanhu ^{[1
]}

Li, Bingyue ^{[1
]}

Mohite, Santosh, V ^{[1
]}

Devaraji, Perumal ^{[1
]}

Mao, Liqun ^{[1
]}

Xing, Ruimin ^{[1
]}

机构：

[1] Henan Univ, Coll Chem & Chem Engn, Henan Key Lab Polyoxometalate Chem, Henan Joint Int Res Lab Environm Pollut Control M, Kaifeng 475004, Henan, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2020年 / 45卷 / 55期

基金：

中国国家自然科学基金;

关键词：

Heterojunction; Hybrid; Bifunctional electrocatalyst; Alkaline water electrolysis; Defective Ni0.96S; MoS2; nanosheets; HYDROGEN EVOLUTION; THIN-FILM; EFFICIENT; GRAPHENE; NANOPARTICLES; NANOFLAKES; CATALYSIS; ARRAY; FOAM;

D O I：

10.1016/j.ijhydene.2020.08.034

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Developing earth-abundant and highly active bifunctional electrocatalysts are critical to advance sustainable hydrogen production via alkaline water electrolysis but still challenging. Herein, heterojunction hybrid of ultrathin molybdenum disulfide (MoS2) nano-sheets and non-stoichiometric nickel sulfide (Ni0.96S) is in situ prepared via a facile one-step hydrothermal strategy, followed by annealing at 400 degrees C for 1 h. Microstructural analysis shows that the hybrid is composed of intimate heterojunction interfaces between Ni0.96S and MoS2 with exposed active edges provided by ultrathin MoS2 nanosheets and rich defects provided by non-stoichiometric Ni0.96S nanocrystals. As expected, it is evaluated as bifunctional electrocatalysts to produce both hydrogen and oxygen via water electrolysis with a hydrogen evolution reaction (HER) overpotential of 104 mV at 10 mA cm(-2) and an oxygen evolution reaction (OER) overpotential of 266 mV at 20 mA cm(-2) under alkaline conditions, outperforming most current noble-metal-free electrocatalysts. This work provides a simple strategy toward the rational design of novel heterojunction electrocatalysts which would be a promising candidate for electrochemical overall water splitting. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：29929 / 29937

页数：9

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