Contribution of dielectric screening to the total capacitance of few-layer graphene electrodes

Zhan, Cheng; Jiang, De-en

doi:10.1021/acs.jpclett.6b00047

Title: Contribution of dielectric screening to the total capacitance of few-layer graphene electrodes

Abstract

We apply joint density functional theory (JDFT), which treats the electrode/electrolyte interface self-consistently, to an electric double-layer capacitor (EDLC) based on few-layer graphene electrodes. The JDFT approach allows us to quantify a third contribution to the total capacitance beyond quantum capacitance (C_Q) and EDL capacitance (C_EDL). This contribution arises from the dielectric screening of the electric field by the surface of the few-layer graphene electrode, and we therefore term it the dielectric capacitance (C_Dielec). We find that C_Dielec becomes significant in affecting the total capacitance when the number of graphene layers in the electrode is more than three. In conclusion, our investigation sheds new light on the significance of the electrode dielectric screening on the capacitance of few-layer graphene electrodes.

Authors:

Zhan, Cheng ^[1]; Jiang, De-en ^[1]

Univ. of California, Riverside, CA (United States)

Publication Date:: Wed Feb 17 00:00:00 EST 2016

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1267032

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physical Chemistry Letters

Additional Journal Information:: Journal Volume: 7; Journal Issue: 5; Journal ID: ISSN 1948-7185

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats


                    Zhan, Cheng, and Jiang, De-en. Contribution of dielectric screening to the total capacitance of few-layer graphene electrodes.  United States: N. p., 2016. 
Web.  doi:10.1021/acs.jpclett.6b00047.

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                    Zhan, Cheng, & Jiang, De-en. Contribution of dielectric screening to the total capacitance of few-layer graphene electrodes.  United States.  https://doi.org/10.1021/acs.jpclett.6b00047

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                    Zhan, Cheng, and Jiang, De-en. Wed .  
"Contribution of dielectric screening to the total capacitance of few-layer graphene electrodes".  United States.  https://doi.org/10.1021/acs.jpclett.6b00047.  https://www.osti.gov/servlets/purl/1267032.

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@article{osti_1267032,

  title        = {Contribution of dielectric screening to the total capacitance of few-layer graphene electrodes},

  author       = {Zhan, Cheng and Jiang, De-en},

  abstractNote = {We apply joint density functional theory (JDFT), which treats the electrode/electrolyte interface self-consistently, to an electric double-layer capacitor (EDLC) based on few-layer graphene electrodes. The JDFT approach allows us to quantify a third contribution to the total capacitance beyond quantum capacitance (CQ) and EDL capacitance (CEDL). This contribution arises from the dielectric screening of the electric field by the surface of the few-layer graphene electrode, and we therefore term it the dielectric capacitance (CDielec). We find that CDielec becomes significant in affecting the total capacitance when the number of graphene layers in the electrode is more than three. In conclusion, our investigation sheds new light on the significance of the electrode dielectric screening on the capacitance of few-layer graphene electrodes.},

  doi          = {10.1021/acs.jpclett.6b00047},

  journal      = {Journal of Physical Chemistry Letters},

  number       = 5,

  volume       = 7,

  place        = {United States},

  year         = {Wed Feb 17 00:00:00 EST 2016},

  month        = {Wed Feb 17 00:00:00 EST 2016}

}

Copy to clipboard

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https://doi.org/10.1021/acs.jpclett.6b00047

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Title: Contribution of dielectric screening to the total capacitance of few-layer graphene electrodes

Abstract

Citation Formats

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