电催化剂
分解水
镍
析氧
无定形固体
催化作用
材料科学
过电位
化学工程
纳米技术
电解水
塔菲尔方程
化学
碱性水电解
电化学
电解质
作者
Jingshuai Chen,Zhenzhen Guo,Yuxin Luo,Mengdie Cai,Yixuan Gong,Song Sun,Zhenxing Liu
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2021-07-02
卷期号:9 (28): 9436-9443
被引量:15
标识
DOI:10.1021/acssuschemeng.1c02897
摘要
Searching highly efficient earth-abundant materials with bifunctional properties for electrocatalytic water splitting is an urgent task to develop hydrogen (H2) energy resource. Herein, nickel iron oxyphosphide (NiFeOP) with an amorphous structure is constructed synchronously via a facile phosphidation treatment on NiFe layered double hydroxide (LDH) nanoflakes. The incorporated P heteroatoms greatly alter the surface atom composition and configuration, thus resulting in an amorphous structure containing abundant defects and active states. Consequently, the as-obtained NiFeOP manifests prominent electrocatalytic performance for the oxygen evolution reaction (OER) under the alkaline condition with a small Tafel slope (43.10 mV dec–1) and a low overpotential (310 mV) to achieve a current density of 10 mA cm–2. Meanwhile, NiFeOP is also active for the hydrogen evolution reaction and therefore shows the enhanced full water splitting activity in comparison with pristine NiFe LDH. Operando electrochemical impedance spectroscopy and activation energy measurements demonstrate that amorphous NiFeOP undergoes fast charge-transfer kinetics and decreased activation energy, leading to superior OER activity. This study provides a novel strategy for the rational engineering of promising amorphous NiFe-based electrocatalysts toward water electrolysis applications.
科研通智能强力驱动
Strongly Powered by AbleSci AI