Three-dimensional sea urchin-like MnCo_(2)O_(4)nanoarchitectures on Ni foam towards high-performance asymmetric supercapacitors  

作　　者：Shufen TAN Yajun JI Fei CHEN Weimin OUYANG 

机构地区：[1]School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China

出　　处：《Frontiers of Materials Science》2021年第4期611-620,共10页材料学前沿（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.21405105);the Shanghai Natural Science Foundation(14ZR1429300);the State Key Laboratory of Green Catalysis of Sichuan Institutes of Higher Education(LZJ1703).

摘　　要：To construct supercapacitors(SCs)with high-efficient electrochemical properties,the morphology and structure of applied electrode materials are the key factors.Herein,three-dimensional(3D)sea urchin-like MnCo_(2)O_(4)nanoarchitectures grown on Ni foam(NF)were successfully synthesized via a simple solvothermal method and subsequent annealing treatment.Electrochemical tests revealed that the area specific capacitances of the MnCo_(2)O_(4)electrode and the corresponding assembled asymmetric device can achieve 1634 and 522 mF·cm^(-2),respectively.When the power density of the assembled asymmetric supercapacitor(ASC)is 2.25 mW·cm^(-2),the maximum energy density can reach 0.163 mW·h·cm^(-2).After 5500 cycles of long-term stability test,the capacity retention rate maintains 91.7%.The excellent electrochemical performance can be mainly ascribed to the unique nanostructure of the material,which provides a great quantity of electroactive sites for Faraday redox reactions as well as accelerates the process of the ions/electrons transport.This work provides a certain reference value for the preparation of MnCo_(2)O_(4)electrode with novel structure and excellent electrochemical performance for SCs.

关 键 词：THREE-DIMENSION nanoarchitecture solvothermal method MnCo_(2)O_(4) annealing treatment SUPERCAPACITOR 

分 类 号：O62[理学—有机化学]