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 175 F g1 at
1 A g1 and 475 F g1 at 0.1 A g1 from the discharge profiles. Assembling the KOH-activated waste coffee
grounds in a coin cell yielded an energy density and power density of 11Wh kg1 and 7500Wkg1,
respectively, with an operating potential of 1.5 V, making waste coffee grounds a viable feedstock for
manufacturing energy materials.
2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder
Technology Japan. All rights reserved
Waste coffee grounds were activated by KOH at various pyrolysis temperatures, changing the ratio of thearea of the mesoporous structure to that of the microporous structure, the surface area, the amount ofoxygen and nitrogen functional groups in the grounds, and their chemical structure. At a pyrolysis temperatureof 700 C, the KOH-activated waste coffee grounds had a specific capacitance of 175 F g1 at1 A g1 and 475 F g1 at 0.1 A g1 from the discharge profiles. Assembling the KOH-activated waste coffeegrounds in a coin cell yielded an energy density and power density of 11Wh kg1 and 7500Wkg1,respectively, with an operating potential of 1.5 V, making waste coffee grounds a viable feedstock formanufacturing energy materials. 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of PowderTechnology Japan. All rights reserved
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