文献类型：期刊文献

英文题名：Ultrahigh intercalation pseudocapacitance of mesoporous orthorhombic niobium pentoxide from a novel cellulose nanocrystal template

作者：Kong, Lingping[1];Zhang, Chuangfang[1];Wang, Jitong[1];Long, Donghui[1];Qiao, Wenming[1];Ling, Licheng[1]

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

年份：2015

卷号：149

起止页码：495

外文期刊名：MATERIALS CHEMISTRY AND PHYSICS

收录：;EI(收录号：20144600192640);WOS:【SCI-EXPANDED(收录号:WOS:000347576900069)】；

基金：This work was partly supported by MOST (2014CB239702) and National Science Foundation of China (No. 51302083, No. 51172071, No. 51272077), and Fundamental Research Funds for the Central Universities and Shanghai Pujiang Program.

语种：英文

外文关键词：Nanostructures; Oxides; Evaporation; Crystal structure; Electrochemical properties

摘要：A facile biotemplating method has been developed to prepare mesoporous orthorhombic nobium pentoxide (T-Nb2O5) films with ultrahigh lithium ion (Li+) intercalation pseudocapacitance. Nanorod-like cellulose nanocrystals (CNs) with 5-10 nm in width and 100-300 nm in length are produced by the hydrolysis of cotton, which can serve as a novel soft templating agent enabling the straightforward synthesis of mesoporous T-Nb2O5 films. By varying the niobic-to-template ratio, it is possible to tune the surface area and crystallite dimension of the Nb2O5 films. The obtained T-Nb2O5 films show typical capacitive-dominated behaviour in the sweep rate range of 1-20 mV s(-1). It delivers an initial intercalation capacity of 644 C g(-1) at a current density of 0.625 A g(-1), corresponding to x = 1.83 for LixNb2O5, and can still keep relatively stable capacity of 560 C g-1 after 300 cycles. Moreover, its excellent high-rate capability (450 C g(-1) at 12.5 A g(-1)) and wider temperature adaptability present here suggests the promising of T-Nb2O5 as high-energy pseudocapacitor electrode with superior intercalation capacitive behaviour. (C) 2014 Elsevier B.V. All rights reserved.