Liquid phase reduction synthesis of a cobalt boride-activated carbon composite with improved specific capacitance and retention rate as a new positive electrode material for supercapacitors

doi:10.1039/c9nj02830g

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	Liquid phase reduction synthesis of a cobalt boride-activated carbon composite with improved specific capacitance and retention rate as a new positive electrode material for supercapacitors
	Hou, Jing-Feng 1; Gao, Jian-Fei 1; Kong, Ling-Bin 1,2
刊名	NEW JOURNAL OF CHEMISTRY
	2019-09-28
卷号	43 期号:36 页码:14475-14484
ISSN号	1144-0546
DOI	10.1039/c9nj02830g
英文摘要	Transition metal compounds have a high theoretical capacity, and thus they are also promising candidates for application as supercapacitors. In this work, a cobalt boride-activated carbon composite has been synthesized and applied as an electrode material of a supercapacitor for the first time. The cobalt boride-carbon composite was prepared using activated carbon (AC) as an additive and cobalt dichloride/sodium borohydride as starting materials. The addition of a small amount of activated carbon greatly improved the electrochemical performance of cobalt boride. By compositing cobalt boride with AC, the challenge of the low electrical conductivity of CoB can be addressed. In a 6 M KOH alkaline aqueous electrolyte, CoB-AC was used as the positive electrode material for an asymmetric supercapacitor (ASC) in order to carry out the electrochemical test. At 0.5 A g(-1), compared with the bare cobalt boride, introducing activated carbon could increase the specific capacitance by 49.5%, up to 193.64 C g(-1). Furthermore, an asymmetric supercapacitor was prepared, utilizing positive CoB-AC and negative activated carbon, respectively. The electrochemical behaviors of the prepared asymmetric supercapacitor were evaluated by cyclic voltammetry, alternating current impedance, and galvanostatic charge-discharge techniques. This showed a wide potential window of 1.6 V and after 10 000 charge/discharge cycles, an outstanding cycling stability retention rate of 80% was maintained at 2 A g(-1). The as-fabricated ASC device could achieve a maximum energy density of 19.14 W h kg(-1) at a power density of 200.59 W kg(-1). We hope that our present work will provide a new solution for designing high specific capacity supercapacitors.
资助项目	National Natural Science Foundation of China[51762031] ; Foundation for Innovation Groups of Basic Research in Gansu Province[1606RJIA322]
WOS研究方向	Chemistry
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000486223200027
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/31556]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
通讯作者	Kong, Ling-Bin
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China 2.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Hou, Jing-Feng,Gao, Jian-Fei,Kong, Ling-Bin. Liquid phase reduction synthesis of a cobalt boride-activated carbon composite with improved specific capacitance and retention rate as a new positive electrode material for supercapacitors[J]. NEW JOURNAL OF CHEMISTRY,2019,43(36):14475-14484.
APA	Hou, Jing-Feng,Gao, Jian-Fei,&Kong, Ling-Bin.(2019).Liquid phase reduction synthesis of a cobalt boride-activated carbon composite with improved specific capacitance and retention rate as a new positive electrode material for supercapacitors.NEW JOURNAL OF CHEMISTRY,43(36),14475-14484.
MLA	Hou, Jing-Feng,et al."Liquid phase reduction synthesis of a cobalt boride-activated carbon composite with improved specific capacitance and retention rate as a new positive electrode material for supercapacitors".NEW JOURNAL OF CHEMISTRY 43.36(2019):14475-14484.