Issue 12, 2024

Sheet-like ZnCo2O4 microspheres and pomelo peel waste-derived activated carbon for high performance solid state asymmetric supercapacitors

Abstract

A novel asymmetric supercapacitor based on zinc cobalt oxide (ZnCo2O4) as a positive electrode and pomelo peel-based activated carbon (PPAC-4) as a negative electrode was fabricated. ZnCo2O4 was synthesized using hydrothermal method and shows a distinct sheet-like structure clubbed together to form microspheres. PPAC-4 was synthesized via the chemical activation of pomelo peel hydrochar using KHCO3 as the activation agent. The as-prepared ZnCo2O4 microspheres displayed maximum specific capacitance of 422 F g−1 at an applied current density of 1 A g−1, whereas PPAC-4 demonstrated a capacitance of 356 F g−1 at a current density of 1 A g−1. Moreover, the novel ZnCo2O4//PPAC-4 asymmetric solid-state supercapacitor with hydroxyethyl cellulose/potassium hydroxide (HEC/KOH) gel electrolyte displayed maximum operating voltage of 1.6 V with a superior energy density of 29.8 W h kg−1 at a power density of 796.3 W kg−1. Besides, a long-term cycling stability of 83% was achieved after 10 000 charge/discharge cycles, indicating its promise for future energy storage applications.

Graphical abstract: Sheet-like ZnCo2O4 microspheres and pomelo peel waste-derived activated carbon for high performance solid state asymmetric supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
04 Feb 2024
Accepted
13 May 2024
First published
17 May 2024
This article is Open Access
Creative Commons BY license

Sustainable Energy Fuels, 2024,8, 2751-2761

Sheet-like ZnCo2O4 microspheres and pomelo peel waste-derived activated carbon for high performance solid state asymmetric supercapacitors

K. K. R. Reddygunta, L. Šiller and A. Ivaturi, Sustainable Energy Fuels, 2024, 8, 2751 DOI: 10.1039/D4SE00182F

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