High temperature vacuum annealing and hydrogenation modification of exfoliated graphite nanoplatelets

Xiaobing Li, Sanjib Biswas, Lawrence T. Drzal

    Research output: Contribution to journalArticle

    • 1 Citations

    Abstract

    Highly active defect sites on the edges of graphene automatically capture oxygen from air to form various oxygen groups. A two-step procedure to remove various oxygen functional groups from the defect sites of exfoliated graphene nanoplatelets (GNPs) has been developed to reduce the atomic oxygen concentration from 9.5% to 4.8%. This two-step approach involves high temperature vacuum annealing followed by hydrogenation to protect the reduced edge carbon atoms from recombining with the atmospheric oxygen. The reduced GNPs exhibit decreased surface resistance and graphitic potential-dependent capacitance characteristics compared to the complex potential-dependent capacitance characteristics exhibited by the unreduced GNPs as a result of the removal of the oxygen functional groups present primarily at the edges. These reduced GNPs also exhibit high electrochemical cyclic stability for electrochemical energy storage applications.

    Original languageEnglish (US)
    Article number638576
    JournalJournal of Engineering (United States)
    Volume2013
    DOIs
    StatePublished - 2013

    Profile

    Oxygen
    Graphene
    Functional groups
    Hydrogenation
    Capacitance
    Vacuum
    Annealing
    Defects
    Temperature
    Acetanilides
    Mainframe Computers
    Hyperostosis, Cortical, Congenital
    Deoxyribonucleoproteins
    Scandium
    Surface resistance
    Energy storage
    Graphite
    Removal
    Atoms
    Carbon

    ASJC Scopus subject areas

    • Civil and Structural Engineering
    • Industrial and Manufacturing Engineering
    • Electrical and Electronic Engineering
    • Mechanical Engineering
    • Chemical Engineering(all)
    • Hardware and Architecture

    Cite this

    High temperature vacuum annealing and hydrogenation modification of exfoliated graphite nanoplatelets. / Li, Xiaobing; Biswas, Sanjib; Drzal, Lawrence T.

    In: Journal of Engineering (United States), Vol. 2013, 638576, 2013.

    Research output: Contribution to journalArticle

    Li, Xiaobing; Biswas, Sanjib; Drzal, Lawrence T. / High temperature vacuum annealing and hydrogenation modification of exfoliated graphite nanoplatelets.

    In: Journal of Engineering (United States), Vol. 2013, 638576, 2013.

    Research output: Contribution to journalArticle

    @article{a7451fc3b7944682b7735342ee58c0ff,
    title = "High temperature vacuum annealing and hydrogenation modification of exfoliated graphite nanoplatelets",
    abstract = "Highly active defect sites on the edges of graphene automatically capture oxygen from air to form various oxygen groups. A two-step procedure to remove various oxygen functional groups from the defect sites of exfoliated graphene nanoplatelets (GNPs) has been developed to reduce the atomic oxygen concentration from 9.5% to 4.8%. This two-step approach involves high temperature vacuum annealing followed by hydrogenation to protect the reduced edge carbon atoms from recombining with the atmospheric oxygen. The reduced GNPs exhibit decreased surface resistance and graphitic potential-dependent capacitance characteristics compared to the complex potential-dependent capacitance characteristics exhibited by the unreduced GNPs as a result of the removal of the oxygen functional groups present primarily at the edges. These reduced GNPs also exhibit high electrochemical cyclic stability for electrochemical energy storage applications.",
    author = "Xiaobing Li and Sanjib Biswas and Drzal, {Lawrence T.}",
    year = "2013",
    doi = "10.1155/2013/638576",
    volume = "2013",
    journal = "Journal of Engineering",
    issn = "2314-4904",
    publisher = "Institution of Engineering and Technology",

    }

    TY - JOUR

    T1 - High temperature vacuum annealing and hydrogenation modification of exfoliated graphite nanoplatelets

    AU - Li,Xiaobing

    AU - Biswas,Sanjib

    AU - Drzal,Lawrence T.

    PY - 2013

    Y1 - 2013

    N2 - Highly active defect sites on the edges of graphene automatically capture oxygen from air to form various oxygen groups. A two-step procedure to remove various oxygen functional groups from the defect sites of exfoliated graphene nanoplatelets (GNPs) has been developed to reduce the atomic oxygen concentration from 9.5% to 4.8%. This two-step approach involves high temperature vacuum annealing followed by hydrogenation to protect the reduced edge carbon atoms from recombining with the atmospheric oxygen. The reduced GNPs exhibit decreased surface resistance and graphitic potential-dependent capacitance characteristics compared to the complex potential-dependent capacitance characteristics exhibited by the unreduced GNPs as a result of the removal of the oxygen functional groups present primarily at the edges. These reduced GNPs also exhibit high electrochemical cyclic stability for electrochemical energy storage applications.

    AB - Highly active defect sites on the edges of graphene automatically capture oxygen from air to form various oxygen groups. A two-step procedure to remove various oxygen functional groups from the defect sites of exfoliated graphene nanoplatelets (GNPs) has been developed to reduce the atomic oxygen concentration from 9.5% to 4.8%. This two-step approach involves high temperature vacuum annealing followed by hydrogenation to protect the reduced edge carbon atoms from recombining with the atmospheric oxygen. The reduced GNPs exhibit decreased surface resistance and graphitic potential-dependent capacitance characteristics compared to the complex potential-dependent capacitance characteristics exhibited by the unreduced GNPs as a result of the removal of the oxygen functional groups present primarily at the edges. These reduced GNPs also exhibit high electrochemical cyclic stability for electrochemical energy storage applications.

    UR - http://www.scopus.com/inward/record.url?scp=84966531695&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84966531695&partnerID=8YFLogxK

    U2 - 10.1155/2013/638576

    DO - 10.1155/2013/638576

    M3 - Article

    VL - 2013

    JO - Journal of Engineering

    T2 - Journal of Engineering

    JF - Journal of Engineering

    SN - 2314-4904

    M1 - 638576

    ER -