One-Step Hydrothermal Synthesis of a CoTe@rGO Electrode Material for Supercapacitors

作     者：Tianrui Wang Yupeng Su Mi Xiao Meilian Zhao Tingwu Zhao Jianguo Shen Tianrui Wang;Yupeng Su;Mi Xiao;Meilian Zhao;Tingwu Zhao;Jianguo Shen

作者机构：School of MicroelectronicsTianjin UniversityTianjin 300072China School of Electrical and Information EngineeringTianjin UniversityTianjin 300072China 

出 版 物：《Transactions of Tianjin University》 (天津大学学报（英文版）)

年 卷 期：2022年第28卷第2期

页      面：112-122页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Natural Science Foundation of China(No.51877146) 

主　　题：Asymmetric supercapacitors Cobalt telluride Reduced graphene oxide Electrode materials High performance 

摘      要：CoTe@reduced graphene oxide(CoTe@rGO)electrode materials for supercapacitors were prepared by a one-step hydrothermal method in this *** with that of pure CoTe,the electrochemical performance of CoTe@rGO was significantly *** results showed that the optimal CoTe@rGO electrode material has a remarkably high specific capacitance of 810.6 F/g at a current density of 1 A/*** 5 A/g,the synthesized material retained 77.2%of its initial capacitance even after 5000 charge/discharge cycles,thereby demonstrating good cycling ***,even at a high current density of 20 A/g,the composite electrode retained 79.0%of its specific capacitance at 1 A/g,thus confirming its excellent rate *** asymmetric supercapacitor(ASC)with a wider potential window and higher energy density was assembled by using 3 M KOH as the electrolyte,the CoTe@rGO electrode as the positive electrode,and active carbon as the negative *** operating voltage of the supercapacitor could be increased to 1.6 V,and its specific capacitance could reach 112.6 F/g at 1 A/*** specific capacitance retention rate of the fabricated supercapacitor after 5000 charge/discharge cycles at 5 A/g was 87.1%,which confirms its excellent cycling *** addition,the ASC revealed a high energy density of 40.04 W·h/kg at a power density of 799.91 W/kg and a high power density of 4004.93 W/kg at an energy density of 33.43 W·h/*** results collectively show that CoTe@rGO materials have broad application prospects.