Cu-Fe based oxides and selenides as advanced electrode materials for high performance symmetric supercapacitors

Copper-based chalcogenides are becoming popular as electrode materials for electrochemical energy storage. Herein, we report the electrochemical energy storage performance of CuFeO2 and CuFeSe2 syn-thesized via facile solvothermal method. At 1 A g-1, the symmetric supercapacitors based on CuFeO2 elec-trodes and CuFeSe2 electrodes exhibit specific capacitance values of 128 F g-1 and 260 F g-1, respectively. Further, CuFeO2 and CuFeSe2 electrodes demonstrate incredible specific energy values of 18 Wh kg-1 and 36 Wh kg-1, respectively, at a specific power of 1 kW kg-1. Moreover, both CuFeO2 and CuFeSe2 electroac-tive materials result in enhanced capacitive retention of 96% and 97%, respectively, for 10,000 charge-discharge cycles. The remarkable electrochemical energy storage performance of both CuFeO2 and CuFeSe2 materials make them potential aspirants for future energy storage systems. (c) 2021 Elsevier B.V. All rights reserved.