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Activated Carbon Electrodes for Supercapacitors from Purple Corncob (Zea maysL.).
Huarote-Garcia, Emily; Cardenas-Riojas, Andy A; Monje, Ivonne E; López, Elvis O; Arias-Pinedo, Ofelia M; Planes, Gabriel A; Baena-Moncada, Angélica M.
Afiliación
  • Huarote-Garcia E; Laboratorio de Investigación de Electroquímica Aplicada, Facultad de Ciencias de la Universidad Nacional de Ingeniería, Av. Túpac Amaru 210, Rímac 15333, Lima, Perú.
  • Cardenas-Riojas AA; Laboratorio de Investigación de Electroquímica Aplicada, Facultad de Ciencias de la Universidad Nacional de Ingeniería, Av. Túpac Amaru 210, Rímac 15333, Lima, Perú.
  • Monje IE; Laboratorio de Investigación de Electroquímica Aplicada, Facultad de Ciencias de la Universidad Nacional de Ingeniería, Av. Túpac Amaru 210, Rímac 15333, Lima, Perú.
  • López EO; Department of Experimental Low Energy Physics, Brazilian Center for Research in Physics (CBPF), Rio de Janeiro 22290-180, Brazil.
  • Arias-Pinedo OM; Laboratorio de Investigación de Electroquímica Aplicada, Facultad de Ciencias de la Universidad Nacional de Ingeniería, Av. Túpac Amaru 210, Rímac 15333, Lima, Perú.
  • Planes GA; Facultad de Ciencias Exactas Fisicoquímicas y Naturales - Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados (IITEMA) Universidad Nacional de Río Cuarto, Ruta Nac. 36, Km 601, Río Cuarto 5800, Córdoba, Argentina.
  • Baena-Moncada AM; Laboratorio de Investigación de Electroquímica Aplicada, Facultad de Ciencias de la Universidad Nacional de Ingeniería, Av. Túpac Amaru 210, Rímac 15333, Lima, Perú.
ACS Environ Au ; 4(2): 80-88, 2024 Mar 20.
Article en En | MEDLINE | ID: mdl-38525024
ABSTRACT
Activated carbon-based supercapacitor electrodes synthesized from biomass or waste-derived biomass have recently attracted considerable attention because of their low cost, natural abundance, and power delivery performance. In this work, purple-corncob-based active carbons are prepared by KOH activation and subsequently evaluated as a composite electrode for supercapacitors using either an acidic or an alkali solution as the electrolyte. The synthesis of the material involves mixing the purple corncob powder with different concentrations of KOH (in the range of 5% to 30%) and a thermal treatment at 700 °C under an inert atmosphere. Physicochemical characterizations were performed using scanning electron microscopy, Raman spectroscopy, N2 physisorption analysis, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, while the electrochemical characteristics were determined using cyclic voltammetry, a galvanostatic charge/discharge curve, and electrochemical impedance techniques measured in a three- and two-electrode system. Composite electrodes activated with 10% KOH had a specific surface area of 728 m2 g-1, and high capacitances of 195 F g-1 at 0.5 A g-1 in 1 mol L-1 H2SO4 and 116 F g-1 at 0.5 A g-1 in 1 mol L-1 KOH were obtained. It also presented a 76% capacitance retention after 50 000 cycles. These properties depend significantly on the microporous area and micropore volume characteristics of the activated carbon. Overall, our results indicate that purple corncob has an interesting prospect as a carbon precursor material for supercapacitor electrodes.

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Environ Au Año: 2024 Tipo del documento: Article

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Environ Au Año: 2024 Tipo del documento: Article