过电位
双功能
析氧
材料科学
电解
分解水
塔菲尔方程
化学工程
电解水
异质结
制氢
电化学
无机化学
氢
化学
催化作用
光催化
电极
光电子学
电解质
有机化学
物理化学
工程类
生物化学
作者
Shanhu Liu,Bingyue Li,S.V. Mohite,Perumal Devaraji,Liqun Mao,Ruimin Xing
标识
DOI:10.1016/j.ijhydene.2020.08.034
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) nanosheets and non-stoichiometric nickel sulfide (Ni0.96S) is in situ prepared via a facile one-step hydrothermal strategy, followed by annealing at 400 °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.
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