KHCO_3 activated carbon microsphere as excellent electrocatalyst for VO^(2+)/VO_2^+ redox couple for vanadium redox flow battery

作     者：Chen Zhao Yuehua Li Zhangxing He Yingqiao Jiang Lu Li Fengyun Jiang Huizhu Zhou Jing Zhu Wei Meng Ling Wang Lei Dai Chen Zhao;Yuehua Li;Zhangxing He;Yingqiao Jiang;Lu Li;Fengyun Jiang;Huizhu Zhou;Jing Zhu;Wei Meng;Ling Wang;Lei Dai

作者机构：School of Chemical EngineeringNorth China University of Science and Technology State Key Laboratory Breeding Base of Nuclear Resources and EnvironmentEast China University of Technology Hebei Province Key Laboratory of Photocatalytic and Electrocatalytic Materials for EnvironmentNorth China University of Science and Technology 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2019年第28卷第2期

页      面：103-110页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 

基　　金：financially supported by National Natural Science Foundation of China (No.51504079) Hebei Natural Science Fund for Distinguished Young Scholar (No.E2017209079) Hebei Provincial Training Program of Innovation and Entrepreneurship for Undergraduates (No.X2016040) Open Project Program of State Key Laboratory Breeding Base of Nuclear Resources and Environment (No.NRE1503) Tangshan Scientific and Technical Innovation Team Project of China (No.15130201C) 

主　　题：Energy storage Vanadium redox flow battery Carbon microsphere KHCO3 Etching 

摘      要：In this paper,carbon microsphere prepared by hydrothermal treatment was activated by KHCO_3 at high temperature,and employed as the catalyst for VO^(2+)/VO_2^+redox reaction for vanadium redox flow battery(VRFB).Carbon microsphere can be etched by KHCO_3 due to the reaction between the pyrolysis products of KHCO_3 and carbon atoms.Moreover,KHCO_3 activation can bring many oxygen functional groups on carbon microsphere,further improving the wettability of catalyst and increasing the active sites.The electrocatalytic properties of carbon microsphere from hydrothermal treatment are improved by high temperature carbonization,and can further be enhanced by KHCO_3 activation.Among carbon microsphere samples,the VO^(2+)/VO_2^+redox reaction exhibits the highest electrochemical kinetics on KHCO_3 activated sample.The cell using KHCO_3 activated carbon microsphere as the positive catalyst demonstrates higher energy efficiency and larger discharge capacity,especially at high current density.The results reveal that KHCO_3 activated carbon microsphere is an efficient,low-cost carbon-based catalyst for VO^(2+)/VO_2^+redox reaction for VRFB system.