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

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    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.

    Original languageEnglish
    Title of host publicationIV Congreso Colombiano de Electroquimica, IVCCEQ 2020
    EditorsJ. Morales, J. Orozco, J. Calderon, R. A. Torres
    PublisherIOP Publishing Ltd
    Pages27-35
    Number of pages9
    Edition1
    ISBN (Electronic)9781607689102
    DOIs
    StatePublished - 2021
    Event4th Congreso Colombiano de Electroquimica, IVCCEQ 2020 - 4th Colombian Congress of Electrochemistry, IVCCEQ 2020 - Virtual, Online, Colombia
    Duration: 5 Oct 20207 Oct 2020

    Publication series

    NameECS Transactions
    Number1
    Volume100
    ISSN (Print)1938-6737
    ISSN (Electronic)1938-5862

    Conference

    Conference4th Congreso Colombiano de Electroquimica, IVCCEQ 2020 - 4th Colombian Congress of Electrochemistry, IVCCEQ 2020
    Country/TerritoryColombia
    CityVirtual, Online
    Period5/10/207/10/20

    Bibliographical note

    Funding Information:
    The authors would like to thank financial support by Departamento Administrativo de Ciencia Tecnología e Innovación – Colciencias (Project 1210-718-49775) and CIDI-UPB (Project 503C-06/19-18).

    Publisher Copyright:
    © The Electrochemical Society.

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