Lignocellulosic biomass-derived, graphene sheet-like porous activated carbon for electrochemical supercapacitor and catechin sensing
Journal
RSC Advances
Journal Volume
7
Journal Issue
72
Pages
45668-45675
Date Issued
2017
Author(s)
Veeramani V.
Sivakumar M.
Chen S.-M.
Madhu R.
Alamri H.R.
Alothman Z.A.
Hossain M.S.A.
Chen C.-K.
Yamauchi Y.
Miyamoto N.
Abstract
We synthesize graphene sheet-like porous activated carbon (GPAC) with a high specific surface area by using Bougainvillea spectabilis as a precursor with the assistance of a facile and reliable chemical activation method. The as-synthesized GPAC materials were characterized with a variety of physico-chemical and analytical techniques to investigate their structural and porous properties. In addition, we apply the synthesized GPAC as an electrode material for supercapacitor and catechin sensing, and corresponding electrochemical studies were carried out using cyclic voltammetry, galvanostatic charge-discharge and differential pulse voltammetry. For supercapacitor application, the GPAC exhibits a specific capacitance of 233 F g -1 (at a current density of 1.6 A g -1 ) and an energy density of 7.2 W h kg -1 (for a symmetric cell). For the sensing application, the GPAC exhibits sensitive detection of catechin (CA). We achieved good sensitivity, an extensive linear range, and a low limit of detection for the CA sensor, with values of 7.2 £gA £gM -1 cm -2 , 4-368 £gM, and 0.67 £gM, respectively. We further test the GPAC sensor in green tea leaves for real time CA detection. This work demonstrates the successful conversion of waste biomass to useful electrochemical devices. ? 2017 The Royal Society of Chemistry.
SDGs
Type
journal article