Journal article
Synthesis of Porous Carbon Honeycomb Structures Derived from Hemp for Hybrid Supercapacitors with Improved Electrochemistry
ChemPlusChem (Weinheim, Germany), Accepted Article, e202400408
2024
PMID: 39194048
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 WasteAgha Mujeeb - Murdoch UniversityJonathan Whale - Murdoch UniversityRichard Evans - MIRRECO Sustainable Futures 6000 Perth AUSTRALIARob Aughterson - Australian Nuclear Science and Technology OrganisationPragati A. Shinde - National Institute for Materials ScienceKatsuhiko Ariga - National Institute for Materials ScienceLok Kumar Shrestha - National Institute for Materials Science
- Publication Details
- ChemPlusChem (Weinheim, Germany), Accepted Article, e202400408
- Publisher
- Chemistry Europe
- Identifiers
- 991005700254207891
- Copyright
- © 2024 Wiley-VCH GmbH
- Murdoch Affiliation
- Centre for Water, Energy and Waste
- Language
- English
- Resource Type
- Journal article
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