Pomegranate: An Eco-Friendly Source for Green Energy Storage Devices

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Publication Date

Spring 2021

Abstract

With an increasing demand for energy and concerns about the environment, scientists are trying to find a better way to generate green energy and to efficiently store the generated energy. Biowaste could be an attractive source for the preparation of active materials for energy storing devices. In this project, a shell of pomegranate was used for the preparation of high surface area carbon for supercapacitor applications. The dry powder of a pomegranate was chemically activated using various ratios of pomegranate and activating agent to produce carbon with a range of different properties. The surface area of the pomegranate-based carbon was 40 m2/g, which improved to 1459, 1737, and 2189 m2/g upon chemical activation using, 1:1, 1:2, and 1:3 ratios of pomegranate: activating agent, respectively. The energy storage capacity was calculated using galvanostatic charge-discharge measurements, and the highest specific capacitance of 190 F/g at 1 A/g was observed for PG-2 (1:2 ratio of pomegranate: activating agent) activated pomegranate-based carbon. Using the electrode, the symmetric supercapacitor devices were fabricated utilizing various electrolytes (aqueous, organic, and ionic liquid electrolytes). From the Ragone curve, the highest energy and power density of [8.8 Wh kg-1, 3,950 W kg-1], [39 Wh kg-1, 8,943 W kg-1], and [68 Wh kg-1, 11,316 W kg-1] was obtained for aqueous, organic, and ionic liquid electrolytes, respectively. Our research suggests that pomegranate-based carbon could be an attractive material for the fabrication of energy storage devices.

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