Self-reduced VO/VOx/carbon nanofiber composite as binder-free electrode for supercapacitors

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	Self-reduced VO/VOx/carbon nanofiber composite as binder-free electrode for supercapacitors
	Tang, Kexin 1,2,3; Li, Yuping 2; Li, Yujiao 2; Cao, Hongbin 1,2,3; Zhang, Zisheng 1,4; Zhang, Yi 1,2,3; Yang, Jun 5
刊名	ELECTROCHIMICA ACTA
	2016-08-10
卷号	209 期号:AUG 页码:709-718
关键词	self-reduction vanadium monoxide vanadium oxycompund supercapacitor carbon nanofibers
ISSN号	0013-4686
英文摘要	In this work, a free-standing, flexible and highly conductive vanadium-carbon nanofiber composite has been fabricated as electrode for Supercapacitors. Vanadium monoxide (VO) coupled with amorphous vanadium covalent bonds (VOx) are successfully incorporated into carbon nanofibers (VO/VOx/CNF) by electrospinning and heat treatment. A theoretical explanation is proposed for the formation of VO/VOx in CNF composites. The VO and VOx are respectively reduced and formed from vanadium precursors of vanadium dioxide (VO2) and vanadyl (IV) acetylacetonate (VOA) by means of self-reduction method, in which carbon precursors (polyacrylonitrile and polyvinylpyrrolidone), small evolved gas molecules (CO, H-2, HCN) and graphitized carbon act as self-reductants. No additional reductants is needed before or after heat treatment, avoiding the secondary contamination. The VO/VOx/CNF electrode has a specific capacitance of 325.7 F g(-1) at a current density of 1 A g(-1) and is capable of reserving 92% of its initial capacitance after 5000 cycles operating at a current density of 4 A g(-1) in a symmetric two-electrode capacitor using 6 M KOH as an electrolyte. The superior electrochemical performance of VO/VOx/CNF may be attributed to two advantages. The first is the enhanced conductivity brought upon the incorporation of quasi-metallic VO (similar to 10(2) Omega(-1)cm(-1)) and the network of nanowire, and the second is the rapid ion transfer rate caused by the rich vanadium redox couples VO/VOx and the well-developed pore structure. Notably, this work has also provided a facile method to obtain varaible low valence states from vanadium oxides through self-reduction, which may also be applied to synthesize other metal oxidescarbon nanofiber composites. (C) 2016 Elsevier Ltd. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Electrochemistry
研究领域[WOS]	Electrochemistry
关键词[WOS]	HIGH-PERFORMANCE SUPERCAPACITORS ; TRANSITION-METAL OXIDES ; HIGH-ENERGY DENSITY ; CARBON-NANOFIBER ; VANADIUM-OXIDE ; ELECTROCHEMICAL CAPACITORS ; FACILE SYNTHESIS ; REDUCTION ; HETEROSTRUCTURES ; NANOCOMPOSITE
收录类别	SCI
语种	英语
WOS记录号	WOS:000379504600077
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/21246]
专题	过程工程研究所_多相复杂系统国家重点实验室
作者单位	1.Tianjin Univ, Sch Chem Engn & Technol, Natl Engn Res Ctr Distillat Technol, Tianjin 300072, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 3.Tianjin Univ, Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300072, Peoples R China 4.Univ Ottawa, Dept Chem & Biol Engn, Ottawa, ON, Canada 5.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Tang, Kexin,Li, Yuping,Li, Yujiao,et al. Self-reduced VO/VOx/carbon nanofiber composite as binder-free electrode for supercapacitors[J]. ELECTROCHIMICA ACTA,2016,209(AUG):709-718.
APA	Tang, Kexin.,Li, Yuping.,Li, Yujiao.,Cao, Hongbin.,Zhang, Zisheng.,...&Yang, Jun.(2016).Self-reduced VO/VOx/carbon nanofiber composite as binder-free electrode for supercapacitors.ELECTROCHIMICA ACTA,209(AUG),709-718.
MLA	Tang, Kexin,et al."Self-reduced VO/VOx/carbon nanofiber composite as binder-free electrode for supercapacitors".ELECTROCHIMICA ACTA 209.AUG(2016):709-718.