Abstract
Waste coffee grounds were activated by KOH at various pyrolysis temperatures, changing the ratio of the area of the mesoporous structure to that of the microporous structure, the surface area, the amount of oxygen and nitrogen functional groups in the grounds, and their chemical structure. At a pyrolysis temperature of 700°C, the KOH-activated waste coffee grounds had a specific capacitance of 175Fg−1 at 1Ag−1 and 475Fg−1 at 0.1Ag−1 from the discharge profiles. Assembling the KOH-activated waste coffee grounds in a coin cell yielded an energy density and power density of 11Whkg−1 and 7500Wkg−1, respectively, with an operating potential of 1.5V, making waste coffee grounds a viable feedstock for manufacturing energy materials.
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