S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
Ordered-mesoporous Nb2O5/carbon composite as a sodium insertion material
- Kim, Haegyeom; Lim, Eunho; Jo, Changshin; Yoon, Gabin; Hwang, Jongkook; Jeong, Sanha; Lee, Jinwoo; Kang, Kisuk
- Issue Date
- Nano Energy, Vol.16, pp.62-70
- The present work introduces a new intercalation host for the Na ions, Nb2O5, and proposes that a mesoporous Nb2O5/carbon composite can function as a promising sodium insertion material. The highly ordered mesoporous Nb2O5/carbon electrode, synthesized using a block copolymer-assisted one-pot method, demonstrated not only a stable cycle life, but also outstanding rate capability. The excellent Na storage properties of the Nb2O5/carbon electrode were due to the uniquely ordered mesoporous nanostructure and in situ carbon formation whose configuration provided a large electrode-electrolyte interface area and enhanced Na ion and electron transport. Ex situ analyses revealed that Nb2O5 stores Na ions through Na de/intercalation reactions combined with surface capacitive reactions, after the activation process during the first sodiation. (C) 2015 Elsevier Ltd. All rights reserved.
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