文献类型：期刊文献

英文题名：Fe, Co-Induced Hydrolysis to Prepare Α-Ni (Oh)2/Β-Ni(Oh)2 Interfaces for Improved Overall Water Splitting Efficiency

作者：Zhou, Guoxu Wang, Zining Zhang, Xichun Ji, Shan Wang, Rongfang Ma, Xianguo Wang, Xuyun Linkov, Vladimir Wang, Hui

第一作者：Zhou, Guoxu

机构：[1] State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, China; [2] College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, China; [3] School of Chemical Science and Engineer Tongji University, 1239 Siping Road, Shanghai, 200092, China; [4] School of Chemical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China; [5] South African Institute for Advanced Material Chemistry, University of the Western Cape, Cape Town, 7535, South Africa

第一机构：State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20240007990)

语种：英文

外文关键词：Catalyst activity - Current density - Electrocatalysts - Electrodes - Electrolysis - Hydrogen production - Nickel compounds - Transition metals

摘要：The development of effective bifunctional electrode materials is necessary for worldwide adoption of large-scale hydrogen production by water electrolysis. Nickel hydroxide - based transition metal materials are among the most promising electrodes for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). While Ni(OH)2 exists in two crystalline states, namely α-Ni(OH)2 and β-Ni(OH)2, neither can meet requirements for effective bifunctional electrode materials on their own, due to relatively low catalytic activity. In this study, bifunctional catalysts with α-Ni(OH)2/β-Ni(OH)2 interfaces, prepared using Fe, Co-induced hydrolysis, have been successfully applied for electrolytic water splitting. According to physical characterization, Fe3+ and Co2+ are incorporated into Ni(OH)2 layers, where Fe doping leads to the formation of a regular flake structure, while Co doping facilitates surface electron transfer, enhancing electrocatalytic activity towards HER and OER. Overpotentials of the obtained catalysts at 100 mA·cm-2 are as low as 224 mV for HER and 324 mV for OER. Both HER and OER overpotentials remained almost unchanged after 24 h operation at a high current density of 1 A·cm-2, demonstrating excellent stability of the newly prepared materials during water electrolysis. The synthesis of α-Ni(OH)2/β-Ni(OH)2 interfaces is a new direction for the manufacturing of industrially applicable water splitting electrocatalysts suitable for high current density operation. ? 2023, The Authors. All rights reserved.