文献类型：期刊文献

英文题名：Synthesis and electrochemical properties of niobium pentoxide deposited on layered carbide-derived carbon

作者：Zhang, Chuanfang (John)[1,2];Maloney, Ryan[3];Lukatskaya, Maria R.[2];Beidaghi, Majid[2];Dyatkin, Boris[2];Perre, Emilie[3];Long, Donghui[1];Qiao, Wenming[1];Dunn, Bruce[3];Gogotsi, Yury[2]

机构：[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

年份：2015

卷号：274

起止页码：121

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20144500155730);WOS:【SCI-EXPANDED(收录号:WOS:000347268700016)】；

基金：The work reported in this paper was performed at Drexel University and the University of California, Los Angeles. The authors greatly appreciate the support of the research from the U.S. Department of Energy, Office of Electricity Delivery and Energy Reliability, Energy Storage Systems Program, through Sandia National Laboratories. C. Zhang was supported by the Chinese Scholarship Council (CSC) (grant no. 201206740035), B. Dyatkin was supported by NSF grant CNS-0960061. K. Jost is acknowledged for the schematic drawing. O. Mashtalir assisted with the TEM analysis. Electron microscopy studies were carried out at the Drexel Centralized Research Facilities (CRF).

语种：英文

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

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.