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<p>Carbon with characteristics to be used in energy storage devices, particularly in supercapacitors, was prepared using waste coffee grounds. The processing conditions were optimized in the present study for that purpose. It was synthesized by pyrolysis, using a factorial experimental design, with the following factors activation agents (phosphoric acid and potassium hydroxide), impregnation time (24, 48 and 72&#xa0;h), and processing temperature (600—800 ºC). A thorough characterization of the produced carbon samples was performed by FFT-IR, XRD, TEM, SEM, TG and N<sub>2</sub> Physisorption, to correlate the structural and compositional characteristics of the carbon with their electrochemical performance as electrodes of a supercapacitor. The electrochemical characterization of the electrodes was carried out in a two-electrode configuration, using an aqueous KOH (5&#xa0;M) solution as electrolyte. The best performing electrodes were the ones made with carbon activated with KOH at medium temperature, exhibiting specific capacities of up to 495 F/g at 1&#xa0;mA/g. It was found out that there are optimal processing conditions for obtaining the best performances.</p>

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Activated carbon from used coffee grounds for energy storage

  • 期刊论文

  • 发表日期：

    2026年3月20日

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  • Alex Pérez Aguirre,
  • Ebelia Del Angel Meraz,
  • Enrique Quiroga González,
  • Rene Sebastián Mora Ortiz,
  • Mayra Agustina Pantoja Castro,
  • Roger Castillo-Palomera

摘要

Carbon with characteristics to be used in energy storage devices, particularly in supercapacitors, was prepared using waste coffee grounds. The processing conditions were optimized in the present study for that purpose. It was synthesized by pyrolysis, using a factorial experimental design, with the following factors activation agents (phosphoric acid and potassium hydroxide), impregnation time (24, 48 and 72 h), and processing temperature (600—800 ºC). A thorough characterization of the produced carbon samples was performed by FFT-IR, XRD, TEM, SEM, TG and N2 Physisorption, to correlate the structural and compositional characteristics of the carbon with their electrochemical performance as electrodes of a supercapacitor. The electrochemical characterization of the electrodes was carried out in a two-electrode configuration, using an aqueous KOH (5 M) solution as electrolyte. The best performing electrodes were the ones made with carbon activated with KOH at medium temperature, exhibiting specific capacities of up to 495 F/g at 1 mA/g. It was found out that there are optimal processing conditions for obtaining the best performances.