文献类型：期刊文献

英文题名：Attaining a high energy density of 106 Wh kg-1 for aqueous supercapacitor based on VS4/rGO/Cos2@Co electrode

作者：Wang, Shengqi[1];Song, Yaping[1];Ma, Yue[1];Zhu, Zhaoqiang[1];Zhao, Chunhua[1];Zhao, Chongjun[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Shanghai Key Lab Adv Polymer Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2019

卷号：365

起止页码：88

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20190606483734);WOS:【SCI-EXPANDED(收录号:WOS:000459009800010)】；

基金：We are grateful for the support of National Natural Science Foundation of China (51502092), The Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning (TP2015028), Shanghai Alliance Plan (No. LM201751, No. LM201881), Shanghai Natural Science Foundation (No. 13ZR1411900), Shanghai Leading Academic Discipline Project (B502), and Shanghai Key Laboratory Project (08DZ2230500).

语种：英文

外文关键词：VS4/rGO/CoS2@Co cathode; rGO/Co9S8@Co anode; 106 Wh kg(-1); In-situ growth; Supercapacitors

摘要：Improving the energy density has been being a challenge for supercapacitors, and the efficient approach is to choose active materials (composites) based on the potential window (chemical stability) and theoretical specific capacitance of both matched electrodes, which usually own unique nano-sized and porous (hierarchical) structure. Herein, hierarchical VS4/rGO/CoS2@Co (VRCS@Co) nanocomposite cathode and rGO/Co9S8@Co (RCS@Co) anode with nanosheet arrays were both in-situ synthesized on Co foam through a simple one-step hydrothermal process in the presence of graphene oxide (GO). VRCS@Co cathode exhibited a high capacitance of 274.3 mAh g(-1) (1353 F g(-1)) at 0.625 A g(-1) and an excellent cyclic life of 89.6% retention at 20,000th cycles, while RCS@Co anode delivered a superior capacitance of 619.5 mAh g(-1) (2230 F g(-1)) at 0.714 A g(-1) and a good cyclability of 93.3% retention at 2000th cycles. An asymmetric supercapacitor (ASC) assembled by using VRCS@Co cathode and RCS@Co anode revealed an ultrahigh energy density of 106 Wh kg(-1) along with a power density of 2.67 kW kg(-1).