Conversion of wheat husk to high surface area activated carbon for energy storage in high-performance supercapacitors

2021-01-01

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Mutawara Mahmood Baig

Iftikhar Hussain Gul *

DOI：10.1016/j.biombioe.2020.105909

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Conversion of carbon-containing biomass into useful carbon products is highly demanded. A rising understanding of environmental problems explains the growing focus on evaluating bioproducts and wastes in numerous applications. Herein, the wheat husks derived activated carbon (WHAC) was employed as electrode material for supercapacitors' energy storage. Three samples of activated carbon were made using wheat husks, which were activated at different temperatures. The prepared electrodes were characterized and electrochemically tested using Fourier-transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscope, cyclic voltammetry, galvanostatic charge-discharge, and electrical impedance spectroscopy. The maximum capacitance (271.5 F g(-1) at a current density of 0.5 A g(-1)) was observed for AC-800, activated at 800 degrees C. The electrochemical impedance showed low resistance (3.659 Omega) and low-frequency response (6.84 s). The AC-800 electrode exhibited the capacitance retention of 82% after 5000 cycles. The excellent electrochemical properties reveal the utilization of biomass waste as a potential electrode material for supercapacitors. The process used is simple, environmentally friendly, and could significantly reduce the county's biomass wastes from wheat husks. The approach can not only reduce environmental pollution but develop porous carbon electrodes for energy storage devices.

Keywords:

Wheat husk

Activated carbon

Supercapacitors

Biomass

Agricultural waste

Conversion of wheat husk to high surface area activated carbon for energy storage in high-performance supercapacitors

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