Improvement of electrochemical capacitance of activated carbon electrodes from African palm shell modified with HNO3

Z. Zapata-Benabithe, E. Arenas, D. A. Borrás-Jiménez, S. N. Herrera-Penagos

Producción científica: Capítulo del libro/informe/acta de congresoPonencia publicada en las memorias del evento con ISBNrevisión exhaustiva

Resumen

Activated carbon electrodes were synthetized from African palm shell with KOH (CK) at 2/1 KOH/biomass mass ratio and treated thermically at 700 °C (1056 m2/g). Then CK was modified at different conditions by surface treatment using HNO3/CK impregnation mass ratios 1 and 12, temperatures between 25 – 80 °C, impregnation time 1 – 4 h. The performance of electrodes as supercapacitors was evaluated in 1 M H2SO4 using electrical impedance spectroscopy (EIS) and charge/discharge technique (CP). The results showed that the specific capacitance increases upon oxidation (57 F/g up to 89.7 F/g). The highest capacitance was obtained for sample prepared at impregnation ratio 1, 4 h and 25 °C (606 m2/g) without increasing the equivalent resistance series significantly. These results were influenced mainly by the increased of nitrogen functional groups rather than specific surface area, which confirm that the surface composition has a high influence on the electrochemical performance.

Idioma originalInglés
Título de la publicación alojadaIV Congreso Colombiano de Electroquimica, IVCCEQ 2020
EditoresJ. Morales, J. Orozco, J. Calderon, R. A. Torres
EditorialIOP Publishing Ltd
Páginas27-35
Número de páginas9
Edición1
ISBN (versión digital)9781607689102
DOI
EstadoPublicada - 2021
Evento4th Congreso Colombiano de Electroquimica, IVCCEQ 2020 - 4th Colombian Congress of Electrochemistry, IVCCEQ 2020 - Virtual, Online, Colombia
Duración: 5 oct. 20207 oct. 2020

Serie de la publicación

NombreECS Transactions
Número1
Volumen100
ISSN (versión impresa)1938-6737
ISSN (versión digital)1938-5862

Conferencia

Conferencia4th Congreso Colombiano de Electroquimica, IVCCEQ 2020 - 4th Colombian Congress of Electrochemistry, IVCCEQ 2020
País/TerritorioColombia
CiudadVirtual, Online
Período5/10/207/10/20

Nota bibliográfica

Publisher Copyright:
© The Electrochemical Society.

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