Activated Overall Water Splitting Over a Ni-Fe Layered Double Hydroxide Electrocatalyst by V Doping and Sulfuration

作     者：Wu, Wentong Peng, Lei Min, Boya Huang, Jie Liu, Saiya Lu, Kejian Lu, Shijian Jing, Dengwei Zheng, Mingsheng Liu, Maochang 

作者机构：International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China No. 8 Oil Production Plant of PetroChina Changqing Oilfield Company Shaanxi Xi’an710016 China Carbon Neutrality Institute Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization China University of Mining and Technology Jiangsu Xuzhou221008 China Gree Altairnano New Energy Inc Zhuhai519040 China School of Chemistry and Biological Engineering University of Science and Technology Beijing Beijing100083 China 

出 版 物：《SSRN》 

年 卷 期：2023年

核心收录：

主　　题：Electrocatalysts 

摘      要：Ni-Fe layered double hydroxide (NiFe-LDH) is regarded as one of the promising non-noble electrocatalyst. However, the limited number of active sites and poor electrical conductivity impede its further development. Herein, we report the synthesis of a Ni foam supported NiFe-LDH electrocatalyst modified by V doping and vulcanization (NiFeV-S/NF). This modification endows the catalyst excellent property toward hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and overall water splitting. Only 211 mV and 127 mV of the overpotentials are required to achieve the current density of 10 mA cm-2 for OER and HER in 1 M KOH electrolyte, respectively. Particularly, the prepared NiFeV-S/NF could serve as a bifunctional electrocatalyst for overall water splitting, with a cell voltage of 1.573 V to reach a current density of 10 mA cm-2. In principle, the success relies on the intrinsically improved conductivity, increased specific surface area and the number of active sites, as well as the heterojunction structure of the catalyst. Therefore, this work provides a new idea for the design and preparation of more efficient noble-metal-free bifunctional electrocatalysts. © 2023, The Authors. All rights reserved.