文献类型：期刊文献

英文题名：Free-Standing T-Nb2O5/Graphene Composite Papers with Ultrahigh Gravimetric/Volumetric Capacitance for Li-Ion Intercalation Pseudocapacitor

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

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

年份：2015

卷号：9

期号：11

起止页码：11200

外文期刊名：ACS NANO

收录：;EI(收录号：20154901634771);WOS:【SCI-EXPANDED(收录号:WOS:000365464800067)】；

基金：This work was supported by MOST (2014CB239702) and National Science Foundation of China (Nos. 51302083, 51172071, and 51272077), and Fundamental Research Funds for the Central Universities and Shanghai Rising-Star Program.

语种：英文

外文关键词：orthorhombic Nb2O5; graphene; free-standing; Li-ion intercalation; pseudocapacitors

摘要：Free-standing electrodes with high gravimetric/volumetric capacitance will open up potential applications in miniaturized consumer electronics. Herein, we report a simple synthesis technology of free-standing orthorhombic Nb2O5 (T-Nb2O5)/graphene composite papers for Li-intercalating pseudocapacitive electrodes. Through a facile polyol-mediated solvothermal reaction, the Nb2O5 nanodots are homogeneously decorated onto the surface of reduced graphite oxide (rGO), which can form a homogeneous Nb2O5/rGO colloidal suspension that can be easily fabricated into flexible composite papers. The heat-treated T-Nb2O5/graphene composite papers exhibit a nanoporous layer-stacked structure with good ionic-electric conductive pathways, high T-Nb2O5 loading of 74.2%, and high bulk density of 1.55 g cm(-3). Such T-Nb2O5/graphene composite papers show a superior pseudocapacitor performance as free-standing electrodes, as evidenced by an ultrahigh gravimetric/volumetric capacitance (620.5 F g(-1) and 961.8 F cm(-3) at 1 mV s(-1)) and excellent rate capability. Furthermore, an organic electrolyte-based asymmetric supercapacitor is assembled based on T-Nb2O5/graphene composite papers, which can deliver a high energy density of 47 W h kg(-1) and power density of 18 kW kg(-1).