过电位
分解水
电催化剂
析氧
双功能
材料科学
催化作用
电化学
化学工程
扫描透射电子显微镜
透射电子显微镜
纳米技术
化学
电极
物理化学
光催化
生物化学
工程类
作者
Yuxuan Li,Jie Yin,Li An,Min Lu,Ke Sun,Yong‐Qin Zhao,Daqiang Gao,Fangyi Cheng,Pinxian Xi
出处
期刊:Small
[Wiley]
日期:2018-05-28
卷期号:14 (26)
被引量:316
标识
DOI:10.1002/smll.201801070
摘要
Abstract Electrochemical water splitting to produce hydrogen and oxygen, as an important reaction for renewable energy storage, needs highly efficient and stable catalysts. Herein, FeS 2 /CoS 2 interface nanosheets (NSs) as efficient bifunctional electrocatalysts for overall water splitting are reported. The thickness and interface disordered structure with rich defects of FeS 2 /CoS 2 NSs are confirmed by atomic force microscopy and high‐resolution transmission electron microscopy. Furthermore, extended X‐ray absorption fine structure spectroscopy clarifies that FeS 2 /CoS 2 NSs with sulfur vacancies, which can further increase electrocatalytic performance. Benefiting from the interface nanosheets' structure with abundant defects, the FeS 2 /CoS 2 NSs show remarkable hydrogen evolution reaction (HER) performance with a low overpotential of 78.2 mV at 10 mA cm −2 and a superior stability for 80 h in 1.0 m KOH, and an overpotential of 302 mV at 100 mA cm −2 for the oxygen evolution reaction (OER). More importantly, the FeS 2 /CoS 2 NSs display excellent performance for overall water splitting with a voltage of 1.47 V to achieve current density of 10 mA cm −2 and maintain the activity for at least 21 h. The present work highlights the importance of engineering interface nanosheets with rich defects based on transition metal dichalcogenides for boosting the HER and OER performance.
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