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    Effect of pH-induced chemical modification of hydrothermally reduced graphene oxide on supercapacitor performance

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    Type
    Article
    Authors
    Bai, Yaocai
    Baby, Rakhi Raghavan
    Chen, Wei
    Alshareef, Husam N. cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Functional Nanomaterials and Devices Research Group
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2013-07
    Permanent link to this record
    http://hdl.handle.net/10754/562828
    
    Metadata
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    Abstract
    Three kinds of reduced graphene oxides are prepared by hydrothermal reduction under different pH conditions and their pseudocapacitive performances are evaluated using full-cell supercapacitor devices. The pH values are found to have great influence on the performance of the supercapacitors, achieving the highest specific capacitance value reported for hydrothermal reduced graphene oxide supercapacitors. Acidic and neutral media yield reduced graphene oxides with more oxygen-functional groups and lower surface areas but with broader pore size distributions than those in basic medium. The graphene produced in the basic solution (nitrogen-doped graphene) presents mainly electrochemical double layer (ECDL) behavior with specific capacitance of 185 F g-1, while the graphene produced under neutral or acidic conditions show both ECDL and pseudocapacitive behavior with specific capacitance of 225 F g-1 (acidic) and 230 F g-1 (neutral), respectively, at a constant current density of 1 A g-1. The influence of pH on cycling performance and electrochemical impedance of the supercapacitive devices is also presented. © 2013 Elsevier B.V. All rights reserved.
    Citation
    Bai, Y., Rakhi, R. B., Chen, W., & Alshareef, H. N. (2013). Effect of pH-induced chemical modification of hydrothermally reduced graphene oxide on supercapacitor performance. Journal of Power Sources, 233, 313–319. doi:10.1016/j.jpowsour.2013.01.122
    Sponsors
    Authors acknowledge the help from Dr M. N. Hedhili, (research scientist, Advanced Nanofabrication, Imaging & Characterization Lab, KAUST) for the XPS measurements and the help from Analytical Chemistry Core Lab (KAUST) in BET measurements. R.B.R. acknowledges the financial support from SABIC Post Doctoral Fellowship. W.C. acknowledges support from KAUST Graduate Fellowship. H.N.A. acknowledges the generous support from the KAUST baseline fund.
    Publisher
    Elsevier BV
    Journal
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2013.01.122
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jpowsour.2013.01.122
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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