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A low crystallinity oxygen-vacancy-rich Co3O4 cathode for high-performance flexible asymmetric supercapacitors
Hao, Jiaxin1; Peng, Shanglong1; Li, Haoqian1; Dang, Shan1; Qin, Tianfeng1; Wen, Yuxiang1; Huang, Juanjuan1; Ma, Fei1; Gao, Daqiang1; Li, Feng3; Cao, Guozhong1,2
Corresponding AuthorPeng, Shanglong(pengshl@lzu.edu.cn) ; Cao, Guozhong(gzcao@u.washington.edu)
2018-09-07
Source PublicationJOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
Volume6Issue:33Pages:16094-16100
AbstractCo3O4 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.
Funding OrganizationNational Natural Science Foundation of China ; Gansu Provincial Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities
DOI10.1039/c8ta06349d
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaChemistry ; Energy & Fuels ; Materials Science
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000443272700016
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:70[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/129348
Collection中国科学院金属研究所
Corresponding AuthorPeng, Shanglong; Cao, Guozhong
Affiliation1.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
Recommended Citation
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.
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