Preparation and characterization of carbon quantum dots grafted Co3O4 nanocomposite for supercapacitors application

Periyasami Prabakaran, Gowdhaman Arumugam, Perumal Ramu, Manickam Selvaraj, Mohammed A. Assiri, Samuel Lalthazuala Rokhum, Sivakumar Periyasamy, Silambarasan Arjunan, Ramesh Rajendran

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A pure Co3O4 nanoparticles and a carbon quantum dots (CQDs) anchored cobalt oxide (Co3O4/CQD) nanocomposite were synthesized by a simple hydrothermal method for supercapacitor application. The powder XRD measurement confirms the formation cubic phase of Co3O4. More HR-TEM measurements. The beneficial surface and electronic properties of CQDs were used for the refinement of the electrochemical accomplishments of Co3O4. The Co3O4/CQD and Co3O4 manifest half-cell specific capacitances of 193.8 F g−1 and 123.6 F g−1 @ current density of 4 A g−1, respectively. The introduction of CQDs into the Co3O4 matrix increased the charge-transfer process, which is primarily responsible for the improved electrochemical capabilities of the nanocomposite. The hybrid asymmetric supercapacitor delivers an energy density of 2.49 W h kg−1 @ a power density of 426 W kg−2 with a capacitance retention of 81.8%.

Original languageEnglish
Article number103153
JournalSurfaces and Interfaces
Volume40
DOIs
StatePublished - Aug 2023

Keywords

  • Electrode materials
  • Metal oxide
  • Nanomaterails
  • Supercapacitor

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