Acid promoted Ni/NiO monolithic electrode for overall water splitting in alkaline medium

作     者：Caicai Li Junxian HOU Zexing Wu Kai Guo Dell Wang Tianyou Zhai Huiqiao Li 李彩彩;侯俊先;吴则星;郭凯;王得丽;翟天佑;李会巧

作者机构：State Key Laboratory of Material Processing and Die ＆ Mould Technology School of Materials Science and Engineering School of Chemistry and Chemical Engineering Huazhong University of Science and Technology （HUST） Wuhan 430074 China Department of Composite Materials and Engineering College of Materials Science and Engineering Hebei University of Engineering Handan 056038 China 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2017年第60卷第10期

页      面：918-928页

核心收录：

学科分类：081702[工学-化学工艺] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China (21571073 and 21673090) the National Basic Research Program of China (2015CB932600) Hubei Provincial Natural Science Foundation of China (2016CFA031) the Program for HUST Interdisciplinary Innovation Team (2015ZDTD038) the Fundamental Research Funds for the Central Universities 

主　　题：electrocatalysis bi-functional acid promoted activation Ni/NiO water splitting monolithic electrode 

摘      要：Exploring and designing bi-functional catalysts with earth-abundant elements that can work well for both hydrogen evolution reaction（HER） and oxygen evolution reaction（OER） in alkaline medium are of significance for producing clean fuel to relieve energy and environment ***,a novel Ni/NiO monolithic electrode was developed by a facile and cost-effective acid promoted activation of Ni *** the treatment,this obtained monolithic electrode with a layer of NiO on its surface demonstrates rough and sheet-like morphology,which not only possesses larger accessible surface area but also provides more reactive active sites. Compared with powder catalysts,this monolithic electrode can achieve intimate contact between the electrocatalyst and the current collector,which will alleviate the problem of pulverization and enable the stable function of the electrode. It can be served as an efficient bi-functional electrocatalyst with an overpotential of 160 mV for HER and 290 mV for OER to produce current densities of 10 mA cm^（-2） in the alkaline medium. And it maintains benign stability after 5,000 cycles,which rivals many recent reported noble-metal free catalysts in 1.0mol L^（-1） KOH solution. Attributed to the easy,scalable methodology and high catalytic efficiency,this work not only offers a promising monolithic catalyst but also inspires us to exploit other inexpensive,highly efficient and self-standing noble metalfree electrocatalysts for scale-up electrochemical water-splitting technology.