Characterization of activated biomass carbon from tea leaf for supercapacitor applications. (March 2022)

• Record Type: Journal Article
• Authors: Thirumal, V.; Yuvakkumar, R.; Ravi, G.; Dineshkumar, G.; Ganesan, M.; Alotaibi, Saad H.; Velauthapillai, Dhayalan
• Is Part Of: Chemosphere. Volume 291:Part 2(2022)
• Publication Date: 2022-03
• Subjects: Tea waste -- Biomass -- Activated carbon -- CVD -- Supercapacitor; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.132931
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In this study, a facile synthesis of chemical and thermal activation of biomass tea-waste materials was explored. A tea-waste biosource carbon was explored by chemical vapor deposition (CVD) method at 700 °C. The KOH-treated carbon (AC-KH) and H3 PO4 -treated carbon (AC-HP) were systematically studied for morphological characteristics and showed good morphological structures and a few transparent focused layered nanosheets. The elemental analysis done by scanning electron microscopy with energy-dispersive X-ray spectroscopy confirmed the presence of activated carbon. Fourier transform infrared spectroscopy (FT-IR) showed carbon-containing functional groups. The electrochemical analysis showed cyclic voltammetry (CV) curves for electric double layer capacitance (EDLC) with 3 M KOH electrolyte. The Nyquist plot obtained using electrochemical impedance spectroscopy (EIS) showed charge transfer resistance value (Rct ) of 6.08 Ω. The electrochemical galvanostatic charge-discharge (GCD) study was conducted to obtain the specific capacitance (Scp) values of AC-KH, which were found to be 131.95 F/g at 0.5 A/g and also AC-HP active material was observed 55.76 F/g at 1 A/g. The AC-KH showed superior electrochemical performance when compared to AC-HP material. Hence, AC-KH is a promising active material for high-energy supercapacitor applications. Graphical abstract: Image 1 Highlights: Prepared AC-KH product exhibited good nanostructures. AC-KH Product exhibited charge transfer resistance value Rct – 6.08 Ω. AC-KH material exhibited 131.95 F/g specific capacitance (Scp) at 0.5 A/g. AC-KH is a promising active material for high-energy supercapacitor.