Bimetallic Nickel Cobalt Sulfide as E cient Electrocatalyst for Zn–Air Battery and Water Splitting

论文摘要

The development of e cient earth-abundant electrocatalysts for oxygen reduction, oxygen evolution, and hydrogen evolution reactions（ORR, OER, and HER） is important for future energy conversion and energy storage devices, for which both rechargeable Zn–air batteries and water splitting have raised great expectations. Herein, we report a single-phase bimetallic nickel cobalt sulfide（（Ni,Co）S2） as an e cient electrocatalyst for both OER and ORR. Owing to the synergistic combination of Ni and Co, the（Ni,Co）S2 exhibits superior electrocatalytic performance for ORR, OER, and HER in an alkaline electrolyte, and the first principle calculation results indicate that the reaction of an adsorbed O atom with a H2O molecule to form a *OOH is the potential limiting step in the OER. Importantly, it could be utilized as an advanced air electrode material in Zn–air batteries, which shows an enhanced charge–discharge performance(charging voltage of 1.71 V and discharge voltage of 1.26 V at 2 mA cm-2), large specific capacity(842 mAh gZn-1 at 5 mA cm-2), and excellent cycling stability（480 h）. Interestingly, the（Ni,Co）S2-based Zn–air battery can e ciently power an electrochemical water-splitting unit with（Ni,Co）S2 serving as both the electrodes. This reveals that the prepared（Ni,Co）S2 has promising applications in future energy conversion and energy storage devices.

论文目录

• HIGHLIGHTS
• 1 Introduction
• 2 Experimental
•   2.1 Synthesis of NiS2, CoS2, and （Ni, Co） S2
•     2.1.1 Preparation of Precursors
•     2.1.2 Thermal Conversion
•   2.2 Preparation of Electrocatalyst Ink
•   2.3 Calculation Details
• 3 Results and Discussion
• 4 Conclusions

文章来源

类型: 期刊论文

作者: Jingyan Zhang,Xiaowan Bai,Tongtong Wang,Wen Xiao,Pinxian Xi,Jinlan Wang,Daqiang Gao,John Wang

来源: Nano-Micro Letters 2019年01期

年度: 2019

分类: 工程科技Ⅰ辑,工程科技Ⅱ辑

专业: 化学,无机化工,电力工业

单位: Key Laboratory for Magnetism and Magnetic Materials of MOE, Key Laboratory of Special Function Materials and Structure Design of MOE, Lanzhou University,School of Physics, Southeast University,Department of Material Science and Engineering, National University of Singapore,Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province and The Research Center of Biomedical Nanotechnology, Lanzhou University

基金: supported by the National Natural Science Foundation of China (Grant Nos. 11474137 and 11674143),Program for Changjiang Scholars and Innovative Research Team in University (IRT 16R35),the Fundamental Research Funds for the Central Universities (Grant Nos. LZUMMM2018017,lzujbky-2018-121),the support of Ministry of Education (MOE2016-T2-2-138,Singapore),for research conducted at the National University of Singapore

分类号: O643.36;TM911.41

页码: 33-45

总页数: 13

文件大小: 1624K

下载量: 42