A low crystallinity oxygen-vacancy-rich Co3O4 cathode for high-performance flexible asymmetric supercapacitors

doi:10.1039/c8ta06349d

IMR OpenIR

	A low crystallinity oxygen-vacancy-rich Co3O4 cathode for high-performance flexible asymmetric supercapacitors
	Hao, Jiaxin 1; Peng, Shanglong 1; Li, Haoqian 1; Dang, Shan 1; Qin, Tianfeng 1; Wen, Yuxiang 1; Huang, Juanjuan 1; Ma, Fei 1; Gao, Daqiang 1; Li, Feng 3; Cao, Guozhong 1,2
通讯作者	Peng, Shanglong(pengshl@lzu.edu.cn) ; Cao, Guozhong(gzcao@u.washington.edu)
	2018-09-07
发表期刊	JOURNAL OF MATERIALS CHEMISTRY A
ISSN	2050-7488
卷号	6 期号:33 页码:16094-16100
摘要	Co3O4 has received ever-growing interest as an electro-active material for supercapacitors due to its high theoretical specific capacitance (3560 F g(-1)) and simple synthesis process. However, the intrinsically poor conductivity and sluggish reaction kinetics lead to a low practical capacity. In this work, a type of low crystallinity oxygen-vacancy-rich Co3O4 cathode has been fabricated through the introduction of Pd2+ during the hydrothermal process. The results indicate that the introduction of Pd can cause a disordered lattice orientation of Co3O4 nanoparticles and lead to reduced crystallinity. Numerous lattice boundaries caused by the poor crystallinity can facilitate the infiltration of electrolyte and contribute to the generation of oxygen vacancies, resulting in enhanced redox reaction and improved conductivity. The Pd-Co3O4 electrode delivers a high specific capacitance of 1353 F g(-1) (4.6 F cm(-2), about 2 times the capacitance of pristine Co3O4) at a current density of 7 mA cm(-2) and presents 95% capacitance retention after 5000 charge/discharge cycles. The aqueous flexible asymmetric supercapacitor (Pd-Co3O4//carbon cloth) exhibits an energy density of 4.7 mW h cm(-3) at the power density of 7 mW cm(-3). This study underscores the potential importance of incorporating low crystallinity and oxygen vacancies into transition metal oxides as a strategy for increasing the charge storage ability of redox-active electrode materials.
资助者	National Natural Science Foundation of China ; Gansu Provincial Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities
DOI	10.1039/c8ta06349d
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[61376011] ; Gansu Provincial Natural Science Foundation of China[17JR5RA198] ; Fundamental Research Funds for the Central Universities[lzujbky-2017-k21] ; Fundamental Research Funds for the Central Universities[lzujbky-2018-ct08] ; Fundamental Research Funds for the Central Universities[lzujbky-2018-119]
WOS研究方向	Chemistry ; Energy & Fuels ; Materials Science
WOS类目	Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS记录号	WOS:000443272700016
出版者	ROYAL SOC CHEMISTRY
引用统计	被引频次：189[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/129348
专题	中国科学院金属研究所
通讯作者	Peng, Shanglong; Cao, Guozhong
作者单位	1.Lanzhou Univ, Sch Phys Sci & Technol, Minist Educ, Key Lab Magnetism & Magnet Mat, Lanzhou 730000, Gansu, Peoples R China 2.Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA 3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Hao, Jiaxin,Peng, Shanglong,Li, Haoqian,et al. A low crystallinity oxygen-vacancy-rich Co3O4 cathode for high-performance flexible asymmetric supercapacitors[J]. JOURNAL OF MATERIALS CHEMISTRY A,2018,6(33):16094-16100.
APA	Hao, Jiaxin.,Peng, Shanglong.,Li, Haoqian.,Dang, Shan.,Qin, Tianfeng.,...&Cao, Guozhong.(2018).A low crystallinity oxygen-vacancy-rich Co3O4 cathode for high-performance flexible asymmetric supercapacitors.JOURNAL OF MATERIALS CHEMISTRY A,6(33),16094-16100.
MLA	Hao, Jiaxin,et al."A low crystallinity oxygen-vacancy-rich Co3O4 cathode for high-performance flexible asymmetric supercapacitors".JOURNAL OF MATERIALS CHEMISTRY A 6.33(2018):16094-16100.