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

Abstract

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.

Zinc Cobalt Sulfide/Reduced Graphene Oxide Nanocomposite for High‐Performance Asymmetric Supercapacitor: A Microwave‐Assisted Synthesis

“…TMS also possess a much lower optical bandgap and higher electrical conductivity than binary metal sulfide and TMO, which give superior rate capability. [ 19 ] However, the main difficulties associated with TMS are the lower specific capacitance and poor cyclic stability. [ 20 ] To overcome these issues, combining TMSs with carbonaceous materials like graphene, porous carbons, carbon nanotubes (CNTs), and carbon nanofibers to form composites has been proven to be an effective strategy.…”

“…[ 27,28 ] However, the main concerns here are the self‐agglomeration and the restacking of its nanolayers due to their van der Waals force of attraction and Π–Π interaction. [ 19 ]…”

“…[27,28] However, the main concerns here are the self-agglomeration and the restacking of its nanolayers due to their van der Waals force of attraction and Π-Π interaction. [19] For superior SC performance, graphene in pristine form or in various structural and morphological modifications is often combined with TMSs using different methods like hydrothermal,…”