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Abstract
A novel asymmetric supercapacitor based on zinc cobalt oxide (ZnCo 2O 4) as a positive electrode and pomelo peel-based activated carbon (PPAC-4) as a negative electrode was fabricated. ZnCo 2O 4 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 KHCO 3 as the activation agent. The as-prepared ZnCo 2O 4 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 ZnCo 2O 4//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.
Original language | English |
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Pages (from-to) | 2751-2761 |
Number of pages | 11 |
Journal | Sustainable Energy and Fuels |
Volume | 8 |
Issue number | 12 |
Early online date | 17 May 2024 |
DOIs | |
Publication status | Published - 21 Jun 2024 |
Funding
AI gratefully acknowledges Scottish Funding Council (SFC) Global Challenges Research Fund (GCRF) and Strathclyde Centre for Doctoral Training (SCDT), Centre for Interdisciplinary Sustainable Practices of Research in Energy (C-INSPRE), for co-funding Kiran’s studentship and this project. She also gratefully acknowledges UK Research and Innovation (UKRI), Engineering and Physical Sciences Research Council (EPSRC) for the Fellowship grant (EP/P011500/1). LŠ would like to thank Engineering and Physical Sciences Research Council (EPSRC) UK, for NEXUS facility at Newcastle University (NS/A000015/1).
Keywords
- supercapacitor
- energy storage
- food waste
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Dive into the research topics of 'Sheet-like ZnCo2O4 microspheres and pomelo peel waste-derived activated carbon for high performance solid state asymmetric supercapacitors'. Together they form a unique fingerprint.Projects
- 1 Finished
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Highly Efficient Elastic Perovskite Solar Cells
Ivaturi, A. (Fellow)
EPSRC (Engineering and Physical Sciences Research Council)
1/09/17 → 30/06/24
Project: Research Fellowship