A Reduced ‐ Graphene ‐ Oxide Entrapped CuCo2S4 Nano‐Array for High‐performance Supercapacitor Electrode

• Published in: ChemistrySelect (Weinheim) Vol. 7; no. 46
• Main Authors: Konwar, Madhabi, Mahanta, Baishali, Patar, Shyamalee, Saikia, Pranjal, Guha, Ankur Kanti, Borthaku, Lakhya Jyoti
• Format: Journal Article
• Language: English
• Published: 13.12.2022
• Subjects: electrochemical; hydrothermal synthesis; nanocomposite; supercapacitor; ternary sulfide
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.202203585

A low temperature and facile solvothermal method was used to synthesise CuCo2S4 ‐ reduced Graphene Oxide (CuCo2S4‐rGO) composite. Nearly uniform anchoring of rGO was achieved which could prevent the agglomeration of CuCo2S4 effectively. Incorporation of CuCo2S4 within the graphene network has effectively reduced the restacking of the nanolayers, increased its surface area and augmented the electrochemical performance of the composite. Supercapacitor electrode fabricated from this composite exhibit excellent electrochemical stability upto 5000 repeated galvanostatic charge discharge cycle. The calculated specific capacitance value, from galvanostatic charge discharge, for the electrode is 1090 F ⋅ g−1 at 1 A ⋅ g−1. The material exhibits 992 F ⋅ g−1 specific capacitance even at elevated current density as high as 5 A ⋅ g−1 implying superior electrochemical stability. At 1 A ⋅ g−1 current density the material has energy density of 54.5 Wh ⋅ kg−1 with power density 543.94 W⋅kg−1 respectively. The electro‐kinetic study reveals that the material stores 69.35 % of total capacitance via capacitive controlled process. Solvothermally synthesized CoCu2S4/rGO composite for fabrication of supercapacitor electrode. Electrode exibits specific capacitance of 1090 F ⋅ g−1 at 1 A ⋅ g−1 current density and electrochemically stable upto 5000 Galvanostatic charge decharge cycles. Electro‐kinetic study revealed that of the total capacitance of the electrode 69.35 % is capacitive contribution.