Synthesis and electrochemical properties of niobium pentoxide deposited on layered carbide-derived carbon

JOURNAL OF POWER SOURCES

卷:274

Article

Zhang, Chuanfang (John)^1,2  Maloney, Ryan³  Lukatskaya, Maria R.²  Beidaghi, Majid²  Dyatkin, Boris²  Perre, Emilie³  Long, Donghui¹  Qiao, Wenming¹  Dunn, Bruce³  Gogotsi, Yury² 

[1] E China Univ Sci & Technol, Dept Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

[2] Drexel Univ, Dept Mat Sci & Engn, AJ Drexel Nanomat Inst, Philadelphia, PA 19104 USA

[3] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

关键词: Pseudocapacitor;    Niobium pentoxide;    Crystallization;    Nanocrystalline;    Hydrothermal;   

DOI  :  10.1016/j.jpowsour.2014.10.018

来源: Elsevier

【 摘 要 】

Herein we report on the hydrothermal synthesis of niobium pentoxide on carbide-derived carbon (Nb2O5/CDC) with a layered structure. The presence of phenylphosphonic acid guides the deposition during preparation, leading to the formation of amorphous Nb2O5 particles which are 4-10 nm in diameter and homogeneously distributed on the CDC framework. Electrochemical testing of the Nb2O5/CDC electrode indicated that the highest capacitance and Coulombic efficiency occurred using an electrolyte comprised of 1 M lithium perchlorate in ethylene carbonateldimethyl carbonate. Subsequent heat treatment of Nb2O5/CDC in CO2 environment led to crystallization of the Nb2O5, allowing reversible Li+ intercalation/de-intercalation. For sweep rates corresponding to charging and discharging in under 3 min, a volumetric charge of 180 C cm(-3) and Coulombic efficiency of 99.2% were attained. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free