期刊
ELECTROCHIMICA ACTA
卷 348, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136339
关键词
NiFe LDH; Heterostructure; Oxygen evolution; Hydrogen evolution; Overall water splitting
资金
- National Natural Science Foundation of China [21972110]
- Fundamental Research Funds for the Central Universities, China [xjj2018192]
- State Key Laboratory of Electrical Insulation and Power Equipment, China [EIPE19123]
Developing highly active and stable noble-metal-free bifunctional electrocatalysts for both hydrogen and oxygen evolution is still a challenge in electrochemical water splitting technology. Herein, a three-dimensional (3D)-networked heterogeneous electrocatalyst in the form of vertically aligned NiFe layered double hydroxide (LDH) nanoflakes coupled with Fe-doped NiSx nanoparticles is supported on biomass-derived carbon microtubes (CMT). The optimal hybrid electrode exhibits superior electrocatalytic activity with low overpotentials of 210 and 157 mV to deliver a current density of 10 mA cm(-2) for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in 1 M KOH, respectively. It is revealed that the remarkable features of the catalyst lie in the unique 3D open configuration, the high conductivity of CMT support and the strong interfacial coupling effects between NiFe LDH and (NiFe)S-x, giving rise to enhanced active sites, accelerating electron/ion transport, and further promoting reaction kinetics of OER/HER. Furthermore, an alkaline water electrolyzer is constructed with the NiFe LDH/(NiFe)S-x/CMT composite as catalyst for both anode and cathode. This electrolyzer displays excellent electrolysis performance (affording 10 mA cm(-2) at 1.53 V) and long-term durability over 100 h. This work demonstrates a strategy in preparing bifunctional and cost-efficient electrocatalysts with potential application in the future. (C) 2020 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据