Graphene quantum dots decorated on spinel nickel cobaltite nanocomposites for boosting supercapacitor electrode material performance

Poonam R. Kharangarh, Nuggehalli M. Ravindra, Rachna Rawal, Amrita Singh, Vinay Gupta

Research output: Contribution to journalArticlepeer-review

Abstract

Composites of transition metal oxides, with carbon, have been considered to be appropriate materials for enhancing their electrochemical properties in supercapacitor applications. In this study, we prepare Nickel-Cobaltite/ Graphene Quantum Dots (NiCo2O4/GQDs) composite structures that exhibit improved electrical conductivity and function as electrode materials with higher energy density in comparison to GQDs and NiCo2O4. The electrochemical performance of NiCo2O4/GQDs is confirmed through galvanostatic charge–discharge method for three electrode systems with an electrolyte of 0.1 M potassium hydroxide. The observed specific capacitance for the fabricated composite has been found to be 481.4 Fg−1 at 0.35Ag−1. It is higher than that of Graphene Quantum Dots (Csp~45.6 Fg−1). This is due to the enhancement in the electrical conductivity and diffusion of ions which become faster between electrodes and electrolyte. These findings demonstrate the unique characteristics of the fabricated composites as superior electrode materials for applications in supercapacitors.

Original languageEnglish (US)
Article number159990
JournalJournal of Alloys and Compounds
Volume876
DOIs
StatePublished - Sep 25 2021

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Keywords

  • Graphene quantum dots
  • Hydrothermal method
  • Nickel-cobaltite/graphene quantum dots
  • Potassium hydroxide
  • Supercapacitor electrode

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