Dissecting graphene capacitance in electrochemical cell

Sheng Sun, Yue Qi, Tong Yi Zhang

    Research output: Contribution to journalArticle

    • 8 Citations

    Abstract

    Quantum capacitance of graphene plays a significant role for graphene's applications in electrochemical devices and sensors, while the determination of these basic characters of Dirac point, Fermi energy, quantum capacitance, etc is still a subject of considerable debate in both experiments and simulations. Here, we report joint first-principles/continuum calculations (JFPCCs) on a monolayer graphene electrode immersed in an electrolyte coupled with a reference electrode under an applied potential. The JFPCCs gave the Fermi level, charge density on graphene, Dirac point energy, electrostatic potential, electric double layer etc as a function of the applied potential with respect to the reference electrode. These results revealed the strongly coupled relationship between Fermi level change and Dirac point shift in electrochemical cell. The total capacitance of the electrochemical cell was dissected into the quantum capacitance of the graphene electrode and the capacitance of the electric double layer. Furthermore, simple and analytic formulas were proposed for the three capacitances, which predicted, in sufficient accuracy, the behavior of capacitance versus potential. These findings deepen the understanding of quantum capacitance of graphene, which will stimulate novel experimental and theoretical studies and boost the applications of graphene in electrochemical and energy areas.

    Original languageEnglish (US)
    Pages (from-to)296-302
    Number of pages7
    JournalElectrochimica Acta
    Volume163
    DOIs
    StatePublished - May 1 2015

    Profile

    Capacitance
    Mainframe Computers
    Graphene
    Electrodes
    Autoradiography
    Electrochemical cells
    Fermi level
    Community Psychiatry
    Charge density
    Electrostatics
    Monolayers
    Electrolytes
    Sensors
    Experiments
    Common Bile Duct Diseases
    Carbuncle
    Clemastine
    Cystamine
    Artificial Organs

    Keywords

    • Dirac point shift
    • Electrode/electrolyte interface
    • Graphene
    • Joint first-principles/continuum calculations
    • Quantum capacitance

    ASJC Scopus subject areas

    • Electrochemistry
    • Chemical Engineering(all)

    Cite this

    Dissecting graphene capacitance in electrochemical cell. / Sun, Sheng; Qi, Yue; Zhang, Tong Yi.

    In: Electrochimica Acta, Vol. 163, 01.05.2015, p. 296-302.

    Research output: Contribution to journalArticle

    Sun, Sheng; Qi, Yue; Zhang, Tong Yi / Dissecting graphene capacitance in electrochemical cell.

    In: Electrochimica Acta, Vol. 163, 01.05.2015, p. 296-302.

    Research output: Contribution to journalArticle

    @article{0ae2e20b3b2541da9e2b539aa804dd25,
    title = "Dissecting graphene capacitance in electrochemical cell",
    abstract = "Quantum capacitance of graphene plays a significant role for graphene's applications in electrochemical devices and sensors, while the determination of these basic characters of Dirac point, Fermi energy, quantum capacitance, etc is still a subject of considerable debate in both experiments and simulations. Here, we report joint first-principles/continuum calculations (JFPCCs) on a monolayer graphene electrode immersed in an electrolyte coupled with a reference electrode under an applied potential. The JFPCCs gave the Fermi level, charge density on graphene, Dirac point energy, electrostatic potential, electric double layer etc as a function of the applied potential with respect to the reference electrode. These results revealed the strongly coupled relationship between Fermi level change and Dirac point shift in electrochemical cell. The total capacitance of the electrochemical cell was dissected into the quantum capacitance of the graphene electrode and the capacitance of the electric double layer. Furthermore, simple and analytic formulas were proposed for the three capacitances, which predicted, in sufficient accuracy, the behavior of capacitance versus potential. These findings deepen the understanding of quantum capacitance of graphene, which will stimulate novel experimental and theoretical studies and boost the applications of graphene in electrochemical and energy areas.",
    keywords = "Dirac point shift, Electrode/electrolyte interface, Graphene, Joint first-principles/continuum calculations, Quantum capacitance",
    author = "Sheng Sun and Yue Qi and Zhang, {Tong Yi}",
    year = "2015",
    month = "5",
    doi = "10.1016/j.electacta.2015.02.049",
    volume = "163",
    pages = "296--302",
    journal = "Electrochimica Acta",
    issn = "0013-4686",
    publisher = "Elsevier Limited",

    }

    TY - JOUR

    T1 - Dissecting graphene capacitance in electrochemical cell

    AU - Sun,Sheng

    AU - Qi,Yue

    AU - Zhang,Tong Yi

    PY - 2015/5/1

    Y1 - 2015/5/1

    N2 - Quantum capacitance of graphene plays a significant role for graphene's applications in electrochemical devices and sensors, while the determination of these basic characters of Dirac point, Fermi energy, quantum capacitance, etc is still a subject of considerable debate in both experiments and simulations. Here, we report joint first-principles/continuum calculations (JFPCCs) on a monolayer graphene electrode immersed in an electrolyte coupled with a reference electrode under an applied potential. The JFPCCs gave the Fermi level, charge density on graphene, Dirac point energy, electrostatic potential, electric double layer etc as a function of the applied potential with respect to the reference electrode. These results revealed the strongly coupled relationship between Fermi level change and Dirac point shift in electrochemical cell. The total capacitance of the electrochemical cell was dissected into the quantum capacitance of the graphene electrode and the capacitance of the electric double layer. Furthermore, simple and analytic formulas were proposed for the three capacitances, which predicted, in sufficient accuracy, the behavior of capacitance versus potential. These findings deepen the understanding of quantum capacitance of graphene, which will stimulate novel experimental and theoretical studies and boost the applications of graphene in electrochemical and energy areas.

    AB - Quantum capacitance of graphene plays a significant role for graphene's applications in electrochemical devices and sensors, while the determination of these basic characters of Dirac point, Fermi energy, quantum capacitance, etc is still a subject of considerable debate in both experiments and simulations. Here, we report joint first-principles/continuum calculations (JFPCCs) on a monolayer graphene electrode immersed in an electrolyte coupled with a reference electrode under an applied potential. The JFPCCs gave the Fermi level, charge density on graphene, Dirac point energy, electrostatic potential, electric double layer etc as a function of the applied potential with respect to the reference electrode. These results revealed the strongly coupled relationship between Fermi level change and Dirac point shift in electrochemical cell. The total capacitance of the electrochemical cell was dissected into the quantum capacitance of the graphene electrode and the capacitance of the electric double layer. Furthermore, simple and analytic formulas were proposed for the three capacitances, which predicted, in sufficient accuracy, the behavior of capacitance versus potential. These findings deepen the understanding of quantum capacitance of graphene, which will stimulate novel experimental and theoretical studies and boost the applications of graphene in electrochemical and energy areas.

    KW - Dirac point shift

    KW - Electrode/electrolyte interface

    KW - Graphene

    KW - Joint first-principles/continuum calculations

    KW - Quantum capacitance

    UR - http://www.scopus.com/inward/record.url?scp=84923830207&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84923830207&partnerID=8YFLogxK

    U2 - 10.1016/j.electacta.2015.02.049

    DO - 10.1016/j.electacta.2015.02.049

    M3 - Article

    VL - 163

    SP - 296

    EP - 302

    JO - Electrochimica Acta

    T2 - Electrochimica Acta

    JF - Electrochimica Acta

    SN - 0013-4686

    ER -