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9. Defect-induced loading of Pt nanoparticles on carbon nanotubes

Author

Kim, Sung Jin, primary, Park, Yong Jin, additional, Ra, Eun Ju, additional, Kim, Ki Kang, additional, An, Kay Hyeok, additional, Lee, Young Hee, additional, Choi, Jae Young, additional, Park, Chan Ho, additional, Doo, Seok Kwang, additional, Park, Min Ho, additional, and Yang, Cheol Woong, additional

Published
2007
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10. High Pseudocapacitance from Ultrathin V2O5 Films Electrodeposited on Self-Standing Carbon-Nanofiber Paper

Author

Ghosh, Arunabha, Ra, Eun Ju, Jin, Meihua, Jeong, Hae‐Kyung, Kim, Tae Hyung, Biswas, Chandan, and Lee, Young Hee

Abstract

An ultrathin V2O5layer 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−1was obtained in a 2 MKCl 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 V2O5(15 wt%). The high capacitance of the V2O5is 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 V2O5layer. 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 V2O5layers of different thicknesses.

Published
2011
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