Biomass‐derived porous carbon and colour‐tunable graphene quantum dots for high‐performance supercapacitor and selective probe for metal ion detection. (25th March 2022)

• Record Type: Journal Article
• Authors: S Iyer, Maalavika; Rajangam, Ilangovan
• Other Names: Bicer Yusuf guestEditor.
• Is Part Of: International journal of energy research. Volume 46:Number 8(2022)
• Page Start: 10833
• Page End: 10843
• Publication Date: 2022-03-25
• Subjects: orange peel -- porous carbon -- quantum dots -- sensing -- supercapacitor; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.7883
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: The abundance of biomass waste and their alteration into carbon‐based electrodes grants practical application of the same. The present work describes all‐round utilization of orange peel waste for the synthesis of graphene quantum dots (GQDs) and carbon‐based electrode fabricated via facile hydrothermal reaction. The supernatant liquid is used for Fe 3+ ion sensing and the remnant material is used for synthesis of porous carbon for supercapacitor application. GQDs synthesised via hydrothermal and microwave technique showed dual emission in blue and green wavelength region. Presence of Fe 3+ ions quenched the fluorescence of GQDs and the selectivity is studied using other metal ions. Concentration of Fe 3+ is varied upto 2.0 mM and the corresponding photoluminescence intensity is observed in the range 85–195 unit, indicating the inverse proportionality relation between these parameters. Carbon obtained has a combination of meso/macro and microporous structure with surface area of 64.002 m 2 g −1 . Porous OC electrode is employed in three electrode system and is fabricated as coin‐cell which delivered specific capacitance of 290.64 F g −1 and 146.9 F g −1, respectively. The asymmetrical supercapacitor delivered an efficiency of 86% after 10 000 charge‐discharge cycle. The resultant material derived from this work is suitable for both energy and sensing application. Abstract : The present work utilizes biomass (orange peel) for synthesis of graphene quantum dots (GQDs) and porous carbon (OC) for sensing and energy application. Presence of Fe3+ ions quenched the fluorescence of GQDs and the selectivity is studied using other metal ions. Porous OC electrode is employed in three electrode system and is fabricated as asymmetric coin‐cell device which delivered specific capacitance of 290.64 F g−1 and 146.9 F g−1, respectively. The device delivered 86% efficiency after 10 000 charge‐discharge cycles.