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Fe2O3-decorated millimeter-long vertically aligned carbon nanotube arrays as advanced anode materials for asymmetric supercapacitors with high energy and power densities
Zhang, Wenkang1; Zhao, Bin1; Yin, Yaolong1; Yin, Tong1; Cheng, Junye1; Zhan, Ke1; Yan, Ya1; Yang, Junhe1; Li, Jianqiang2
2016
Source PublicationJOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
Volume4Issue:48Pages:19026-19036
Abstract

Construction of high-energy density asymmetric supercapacitors is often hindered by unsatisfactory matching between the anode and cathode. Thus, it is crucial to develop composite anodes with high specific capacitance to match that of cathodes. In this work, a novel anode material with well-dispersed Fe2O3 decorated on vertically aligned carbon nanotubes has been synthesized by a facile two-step method, consisting of supercritical carbon dioxide (SCCO2) assisted impregnation and subsequent thermal annealing. Due to the advantageous nanostructure, the Fe2O3/VACNT composites exhibit a large specific capacitance of 248 F g(-1) at 8 A g(-1) in 2 M KOH between -1.2 and 0 V versus SCE. An asymmetric supercapacitor operating at 1.8 V is assembled using the Fe2O3/VACNTs as the anode and the NiO/VACNTs as the cathode in a 2 M KOH aqueous electrolyte. The NiO/VACNTs//Fe2O3/VACNT asymmetric supercapacitor achieves an extremely high energy density of 137.3 W h kg(-1) at a power density of 2.1 kW kg(-1), and still retains 102.2 W h kg(-1) at the high power density of 39.3 kW kg(-1). Moreover, it also shows an outstanding cycling stability with similar to 89.2% capacitance retention after 5000 cycles. The facile and effective synthesis method, as well as the superior electrochemical performance of the Fe2O3/VACNT composites, pave a way for promising applications in high-performance energy storage.

SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1039/c6ta07720j
Indexed BySCI
Language英语
WOS KeywordELECTROCHEMICAL CAPACITORS ; OXIDE COMPOSITES ; OXYGEN REDUCTION ; NANOWIRE ANODE ; METAL-OXIDES ; ELECTRODES ; STORAGE ; GRAPHENE ; PAPER ; ELECTROLYTES
WOS Research AreaChemistry ; Energy & Fuels ; Materials Science
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
Funding OrganizationNatural Science Foundation of Shanghai(16ZR1423500) ; Program for Associate Professor of Special Appointment (Young Eastern Scholar) at Shanghai Institutions of Higher Learning(QD2016013)
WOS IDWOS:000390433700042
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/21859
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Wenkang,Zhao, Bin,Yin, Yaolong,et al. Fe2O3-decorated millimeter-long vertically aligned carbon nanotube arrays as advanced anode materials for asymmetric supercapacitors with high energy and power densities[J]. JOURNAL OF MATERIALS CHEMISTRY A,2016,4(48):19026-19036.
APA Zhang, Wenkang.,Zhao, Bin.,Yin, Yaolong.,Yin, Tong.,Cheng, Junye.,...&Li, Jianqiang.(2016).Fe2O3-decorated millimeter-long vertically aligned carbon nanotube arrays as advanced anode materials for asymmetric supercapacitors with high energy and power densities.JOURNAL OF MATERIALS CHEMISTRY A,4(48),19026-19036.
MLA Zhang, Wenkang,et al."Fe2O3-decorated millimeter-long vertically aligned carbon nanotube arrays as advanced anode materials for asymmetric supercapacitors with high energy and power densities".JOURNAL OF MATERIALS CHEMISTRY A 4.48(2016):19026-19036.
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