文献类型：期刊文献

英文题名：Rational synthesis of Cu7Se4-CuxCo1-xSe2 double-shell hollow nanospheres for high performance supercapacitors

作者：Yang, Xiaoxiang[1,2];Chen, Xin[1,2];Cao, Hongliang[1,2,3];Li, Chang[1,2,4];Wang, Lingling[1,2];Wu, Yulian[1,2];Wang, Chuanzhen[1,2];Li, Yan[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Biomed Nanotechnol Ctr, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[4]Anhui Univ Sci & Technol, Analyt & Testing Ctr, Huainan 232001, Peoples R China

年份：2020

卷号：480

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20203609140931);WOS:【SCI-EXPANDED(收录号:WOS:000593850900003)】；

基金：This work was supported by the National Natural Science Foundation of China (21875066); Shanghai Leading Academic Discipline Project (B502); and the Shanghai Key Laboratory Project (08DZ2230500).

语种：英文

外文关键词：Self-template method; Hollow nanosphere; Transition metal selenide; Supercapacitor

摘要：Novel bimetallic copper cobalt selenide (CCS) hollow nanosphere composites are synthesized with a self template method. Instead of making the reaction more complete, the optimized Cu7Se4CuxCo1-xSe2 composite is obtained by hydrothermal treatment with a relatively short time (CCS-2h). Such a composite electrode not only exhibits a specific capacitance of 349.1 F g(-1) at 1 A g(-1), a good rate performance of 80.1% capacitance retention with current density increased to 20 A g(-1), but also exhibits a superior electrochemical stability of 106.4% capacitance retention after 5000 cycles. The asymmetric supercapacitor assembled by CCS-2h and activated carbon electrodes also exhibits a good energy density of 26.84 Wh kg1 at 700 W kg(-1), and a good cycling performance of 94.1% capacitance retention after 5000 cycles. This work not only demonstrates the application potential of transition metal selenides composites in supercapacitors, but also suggests a new method for designing high-performance supercapacitor materials.