A one-step water based strategy for synthesizing hydrated vanadium   pentoxide nanosheets from VO2(B) as free-standing electrodes for lithium   battery applications

doi:10.1039/c6ta06571f

CORC > 北京大学 > 化学与分子工程学院

	A one-step water based strategy for synthesizing hydrated vanadium pentoxide nanosheets from VO2(B) as free-standing electrodes for lithium battery applications
	Etman, Ahmed S. ; Asfaw, Habtom D. ; Yuan, Ning ; Li, Jian ; Zhou, Zhengyang ; Peng, Fei ; Persson, Ingmar ; Zou, Xiaodong ; Gustafsson, Torbjorn ; Edstrom, Kristina ; Sun, Junliang
刊名	JOURNAL OF MATERIALS CHEMISTRY A
	2016
关键词	ELECTROCHEMICAL ENERGY-STORAGE SUPERIOR CATHODE MATERIAL ION BATTERIES ULTRATHIN NANOSHEETS PHASE-TRANSFORMATION ATOMIC THICKNESS OXIDE NANOTUBES RATE CAPABILITY TIO2 ANATASE V2O5
DOI	10.1039/c6ta06571f
英文摘要	The synthesis of two dimensional (2D) materials from transition metal oxides, chalcogenides, and carbides mostly involve multiple exfoliation steps in which hazardous solvents and reagents are used. In this study, hydrated vanadium pentoxide (V2O5 center dot nH(2)O) nanosheets with a thickness of a few nanometers were prepared via a facile environmentally friendly water based exfoliation technique. The exfoliation process involved refluxing the precursor, vanadium dioxide (VO2(B)), in water for a few days at 60 degrees C. The proposed exfoliation mechanism is based on the intercalation/insertion of water molecules into the VO2(B) crystals and the subsequent cleavage of the covalent bonds holding the layers of VO2(B) together. The thermal and chemical analyses showed that the approximate chemical composition of the nanosheets is H0.4V2O5 center dot 0.55H(2)O, and the percentage of V-V content to that of V-IV in the nanosheets is about 80(3)% to 20(3)%. The exfoliated aqueous suspension of the V2O5 center dot 0.55H(2)O nanosheets was successfully deposited onto multi-walled carbon nanotube (MW-CNT) paper to form free-standing electrodes with a thickness of the V2O5 center dot 0.55H(2)O layer ranging between 45 and 4 mu m. A series of electrochemical tests were conducted on the electrodes to determine the cyclability and rate capability of lithium insertion into V2O5 center dot 0.55H(2)O nanosheets. The electrodes with the thinnest active material coating (similar to 4 mu m) delivered gravimetric capacities of up to 480 and 280 mA h g(-1) when cycled at current densities of 10 and 200 mA g(-1), respectively.; Berzelii Center EXSELENT on Porous Materials; Swedish Research Council [2012-4681]; Swedish Energy Agency; StandUp for Energy; Knut och Alice Wallenbergs Stiftelse [I811]; SCI(E); ARTICLE; Kristina.Edstrom@kemi.uu.se; Junliang.sun@pku.edu.cn; 46; 17988-18001; 4
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/459150]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Etman, Ahmed S.,Asfaw, Habtom D.,Yuan, Ning,et al. A one-step water based strategy for synthesizing hydrated vanadium pentoxide nanosheets from VO2(B) as free-standing electrodes for lithium battery applications[J]. JOURNAL OF MATERIALS CHEMISTRY A,2016.
APA	Etman, Ahmed S..,Asfaw, Habtom D..,Yuan, Ning.,Li, Jian.,Zhou, Zhengyang.,...&Sun, Junliang.(2016).A one-step water based strategy for synthesizing hydrated vanadium pentoxide nanosheets from VO2(B) as free-standing electrodes for lithium battery applications.JOURNAL OF MATERIALS CHEMISTRY A.
MLA	Etman, Ahmed S.,et al."A one-step water based strategy for synthesizing hydrated vanadium pentoxide nanosheets from VO2(B) as free-standing electrodes for lithium battery applications".JOURNAL OF MATERIALS CHEMISTRY A (2016).