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Ni(OH)_(2) Derived from NiS_(2) Induced by Reflux Playing Three Roles for Hydrogen/Oxygen Evolution Reaction

Ni(OH)2 Derived from NiS2 Induced by Reflux Playing Three Roles for Hydrogen/Oxygen Evolution Reaction

作     者:Sheng-Jun Xu Ya-Nan Zhou Guo-Ping Shen Bin Dong Sheng-Jun Xu;Ya-Nan Zhou;Guo-Ping Shen;Bin Dong

作者机构:Dongying Haike Ruilin Chemical Co.LTD.Dongying 257000China State Key Laboratory of Heavy Oil ProcessingCollege of Chemistry and Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580China 

出 版 物:《Chinese Journal of Structural Chemistry》 (结构化学(英文))

年 卷 期:2022年第41卷第8期

页      面:52-57页

核心收录:

学科分类:081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)] 

基  金:financially supported by the National Natural Science Foundation of China (52174283) 

主  题:Ni(OH)_(2) NiS_(2) heterostructures oxygen evolution reaction hydrogen evolution reaction 

摘      要:Developing efficient and promising non-noble catalysts for oxygen evolution reaction(OER) and hydrogen evolution reaction(HER) is vital but still a huge challenge for the clean energy system. Herein, we have integrated the active components for OER(Ni(OH)_(2)) and HER(Ni S_(2) and Ni(OH)_(2)) into Ni(OH)_(2)@NiS_(2) heterostructures by a facile reflux method. The in-situ formed Ni(OH)_(2) thin layer is coated on the surface of hollow Ni S2 nanosphere. The uniform Ni(OH)_(2)@NiS_(2) hollow sphere processes enlarge the electrochemically active specific surface area and enhance the intrinsic activity compared to NiS_(2) precursor, which affords a current density of 10 m A cm^(-2) at the overpotential of 309 m V and 100 m Acm^(-2) at 359 m V for OER. Meanwhile, Ni(OH)_(2)@NiS_(2) can reach 10 m A cm^(-2) at 233 m V for HER, superior to pure NiS_(2). The enhanced performance can be attributed to the synergy between Ni(OH)_(2) and NiS_(2). Specifically, Ni(OH)_(2) has three functions for water splitting: providing active sites for hydrogen adsorption and hydroxyl group desorption and working as real OER active sites. Moreover, Ni(OH)_(2)@NiS_(2) displays great stability for OER(50 h) and HER(30 h).

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