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dc.contributor.authorBai, Yaocai
dc.contributor.authorBaby, Rakhi Raghavan
dc.contributor.authorChen, Wei
dc.contributor.authorAlshareef, Husam N.
dc.date.accessioned2015-08-03T11:11:47Z
dc.date.available2015-08-03T11:11:47Z
dc.date.issued2013-07
dc.identifier.issn03787753
dc.identifier.doi10.1016/j.jpowsour.2013.01.122
dc.identifier.urihttp://hdl.handle.net/10754/562828
dc.description.abstractThree 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.
dc.description.sponsorshipAuthors 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.
dc.publisherElsevier BV
dc.subjectfunctionalization
dc.subjectGraphene
dc.subjectHydrothermal
dc.subjectpH
dc.subjectSpecific capacitance
dc.subjectSupercapacitor
dc.titleEffect of pH-induced chemical modification of hydrothermally reduced graphene oxide on supercapacitor performance
dc.typeArticle
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Center
dc.contributor.departmentFunctional Nanomaterials and Devices Research Group
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Power Sources
kaust.personBai, Yaocai
kaust.personBaby, Rakhi Raghavan
kaust.personAlshareef, Husam N.
kaust.personChen, Wei


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