Coconut Residue-Derived Nanoporous Carbon via Hydrothermal Carbonization for Nanoporous Carbon-Based Supercapacitor Electrodes

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dc.contributor.authorRuenroengrit, Kemchat
dc.contributor.authorKunyuan, Jumpon
dc.contributor.authorRuttanadech, Nuttapong
dc.contributor.authorKaewtrakulchai, Napat
dc.contributor.authorPuengjinda, Pramote
dc.contributor.authorChaiammart, Nattapat
dc.contributor.authorChutipaijit, Sutee
dc.contributor.authorBuasri, Achanai
dc.contributor.authorFuji, Masayoshi
dc.contributor.authorEiad-Ua, Apiluck
dc.contributor.authorPanomsuwan, Gasidit
dc.date.accessioned2026-08-06T10:51:41Z
dc.date.available2026-08-06T10:51:41Z
dc.date.issued2025-07-01
dc.description.abstractThe increasing demand for sustainable and cost-effective energy storage solutions has driven interest in biomass-derived carbon materials for supercapacitor electrodes. This study explores the valorization of coconut residue (CR), an abundant agricultural waste, as a carbon precursor for nanoporous carbon (NPC) production. NPC was synthesized via hydrothermal carbonization (HTC) of CR, followed by chemical activation using potassium hydroxide (KOH) at varying temperatures (700, 800, and 900 °C). The effects of activation temperature on the structure and electrochemical performance of the NPC were systematically investigated. The activated materials exhibited amorphous, highly porous structures, with surface areas increasing alongside activation temperature—reaching a maximum of 1969 m<sup>2</sup> g<sup>−1</sup> at 900 °C. Electrochemical characterization was conducted using a three-electrode setup through cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) in a 1 M Na<inf>2</inf>SO<inf>4</inf> electrolyte. The sample activated at 900 °C with a CR:KOH weight ratio of 1:2.5 achieved the highest specific capacitance of 52 F g<sup>−1</sup> at a specific current of 1 A g<sup>−1</sup>. These findings underscore the potential of CR as a low-cost and sustainable raw material for fabricating efficient electrode materials in energy storage applications.
dc.identifier.citationPolymers, 17(13), 2025
dc.identifier.doi10.3390/polym17131752
dc.identifier.issn20734360
dc.identifier.other2-s2.0-105010338701
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/17117
dc.sourcePolymers
dc.subjectcoconut residue
dc.subjecthydrothermal carbonization
dc.subjectKOH activation
dc.subjectnanoporous carbon
dc.subjectsupercapacitor electrodes
dc.titleCoconut Residue-Derived Nanoporous Carbon via Hydrothermal Carbonization for Nanoporous Carbon-Based Supercapacitor Electrodes
dc.typeArticle

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