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

Lookup NU author(s): Professor Lidija SillerORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

© 2024 The Royal Society of Chemistry. 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.

Publication metadata

Author(s): Reddygunta KKR, Siller L, Ivaturi A

Publication type: Article

Publication status: Published

Journal: Sustainable Energy and Fuels

Year: 2024

Volume: 8

Issue: 12

Pages: 2751-2761

Print publication date: 21/06/2024

Online publication date: 17/05/2024

Acceptance date: 13/05/2024

Date deposited: 18/06/2024

ISSN (electronic): 2398-4902

Publisher: Royal Society of Chemistry

URL: https://doi.org/10.1039/d4se00182f

DOI: 10.1039/d4se00182f

Data Access Statement: Suplementary Information: https://www.rsc.org/suppdata/d4/se/d4se00182f/d4se00182f2.pdf

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Funding

Funder referenceFunder name
EPSRC
EP/P011500/1
NS/A000015/1
Scottish Funding Council (SFC) Global Challenges Research Fund (GCRF)
Strathclyde Centre for Doctoral Training (SCDT), Centre for Interdisciplinary Sustainable Practices of Research in Energy (C-INSPRE)
UKRI

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