Influence of the activation parameters on the electrochemical performance of chemically activated graphene materials

Y. Quintero, S. Herrera, Z. Zapata-Benabithe, D. Arango, R. Santamaría, Z. González, L. Cruz

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

    Abstract

    In this work, activated graphene-like materials were obtained by varying both, the ratio of activated agent/graphene precursor and the activation temperature. The resulting materials were then characterized, resulting in higher values of specific surface area (SSA) when increasing the impregnation ratio at each temperature, reaching values up to 1325 m2 g−1. Gravimetric capacitances ranging between 11.0 and 49.0 F g−1 when charging/discharging at 0.5 A g-1 were obtained. The highest capacitance value was achieved not for samples with the highest SSA but with a micropore volume up to ~ 63 % of total pore volume. Overall, the capacitance values decreased significantly at activation temperatures of 600 and 700 °C at 2:1 and 4:1 impregnation ratios, regardless of an enhanced SSA, which could be explained considering the release of surface oxygenated functional groups during the thermal treatment. These results present the activated graphene materials as promising electrodes in energy storage devices.

    Original languageEnglish
    Title of host publicationIV Congreso Colombiano de Electroquimica, IVCCEQ 2020
    EditorsJ. Morales, J. Orozco, J. Calderon, R. A. Torres
    PublisherIOP Publishing Ltd
    Pages13-26
    Number of pages14
    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 from Minciencias, Colombia (project No. 121071552608), and CIDI-UPB, and to INCAR-CSIC for the technical and scientific support. Also, XPS Laboratory of the Antioquia University for XPS analysis.

    Publisher Copyright:
    © The Electrochemical Society.

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