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High Pseudocapacitance from Ultrathin V 2 O 5 Films Electrodeposited on Self‐Standing Carbon‐Nanofiber Paper
Author(s) -
Ghosh Arunabha,
Ra Eun Ju,
Jin Meihua,
Jeong HaeKyung,
Kim Tae Hyung,
Biswas Chandan,
Lee Young Hee
Publication year - 2011
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201002603
Subject(s) - pseudocapacitance , polyacrylonitrile , materials science , nanofiber , electrolyte , cyclic voltammetry , carbon nanofiber , capacitance , oxide , layer (electronics) , carbon fibers , redox , electrospinning , supercapacitor , nanotechnology , chemical engineering , electrochemistry , composite material , electrode , carbon nanotube , polymer , chemistry , metallurgy , composite number , engineering
An ultrathin V 2 O 5 layer was electrodeposited by cyclic voltammetry on a self‐standing carbon‐nanofiber paper, which was obtained by stabilization and heat‐treatment of an electrospun polyacrylonitrile (PAN)‐based nanofiber paper. A very‐high capacitance of 1308 F g −1 was obtained in a 2 M KCl electrolyte when the contribution from the 3 nm thick vanadium oxide was considered alone, contributing to over 90% of the total capacitance (214 F g −1 ) despite the low weight percentage of the V 2 O 5 (15 wt%). The high capacitance of the V 2 O 5 is attributed to the large external surface area of the carbon nanofibers and the maximum number of active sites for the redox reaction of the ultrathin V 2 O 5 layer. This ultrathin layer is almost completely accessible to the electrolyte and thus results in maximum utilization of the oxide (i.e., minimization of dead volume). This hypothesis was experimentally evaluated by testing V 2 O 5 layers of different thicknesses.