Synthesis of Porous Carbon Honeycomb Structures Derived from Hemp for Hybrid Supercapacitors with Improved Electrochemistry

Manickam Minakshi; Agha Mujeeb; Jonathan Whale; Richard Evans; Rob Aughterson; Pragati A. Shinde; Katsuhiko Ariga; Lok Kumar Shrestha

doi:10.1002/cplu.202400408

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Synthesis of Porous Carbon Honeycomb Structures Derived from Hemp for Hybrid Supercapacitors with Improved Electrochemistry

Journal article

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Synthesis of Porous Carbon Honeycomb Structures Derived from Hemp for Hybrid Supercapacitors with Improved Electrochemistry

Manickam Minakshi, Agha Mujeeb, Jonathan Whale, Richard Evans, Rob Aughterson, Pragati A. Shinde, Katsuhiko Ariga and Lok Kumar Shrestha

ChemPlusChem (Weinheim, Germany), Vol.89(12), e202400408

2024

DOI: https://doi.org/10.1002/cplu.202400408

PMID: 39194048

Appears in Open Access via Read & Publish Agreements

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Abstract

Energy storage in electrochemical hybrid capacitors involves fast faradaic reactions such as an intercalation, or redox process occurring at a solid electrode surface at an appropriate potential. Hybrid sodium-ion electrochemical capacitors bring the advantages of both the high specific power of capacitors and the high specific energy of batteries, where activated carbon serves as a critical electrode material. Herein, we have demonstrated that a porous honeycomb structure activated carbon derived from Australian hemp hurd (Cannabis sativa L.) in aqueous Na2SO4 electrolyte showed a specific capacitance of 240 F/g at 1 A/g. The hybrid sodium-ion device employing hemp-derived activated carbon (HAC) coupled with electrolytic manganese dioxide (EMD) in an aqueous Na2SO4 electrolyte showed a specific capacitance of 95 F/g at 1 A/g having a capacitance retention of 90%. The hybrid device (HAC||EMD) can possess excellent electrochemical performance metrics, having a high energy density of 38 Wh/kg at a power density of 761 W/kg. Overall, this study provides insights into the influence of the activation temperature and the KOH impregnation ratio on morphology, porosity distribution, and the activated carbon's electrochemical properties with faster kinetics. The high cell voltage for the device is devoted to the EMD electrode.

Details

Title: Synthesis of Porous Carbon Honeycomb Structures Derived from Hemp for Hybrid Supercapacitors with Improved Electrochemistry
Authors/Creators: Manickam Minakshi - Murdoch University, Centre for Water, Energy and Waste
Agha Mujeeb - Murdoch University
Jonathan Whale - Murdoch University
Richard Evans - MIRRECO Sustainable Futures 6000 Perth AUSTRALIA
Rob Aughterson - Australian Nuclear Science and Technology Organisation
Pragati A. Shinde - National Institute for Materials Science
Katsuhiko Ariga - National Institute for Materials Science
Lok Kumar Shrestha - National Institute for Materials Science
Publication Details: ChemPlusChem (Weinheim, Germany), Vol.89(12), e202400408
Publisher: Wiley-VCH GmbH
Identifiers: 991005700254207891
Murdoch Affiliation: Centre for Water, Energy and Waste
Language: English
Resource Type: Journal article

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