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

Handle URI:
http://hdl.handle.net/10754/562828
Title:
Effect of pH-induced chemical modification of hydrothermally reduced graphene oxide on supercapacitor performance
Authors:
Bai, Yaocai; Baby, Rakhi Raghavan; Chen, Wei; Alshareef, Husam N. ( 0000-0001-5029-2142 )
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.
KAUST Department:
Materials Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Advanced Membranes and Porous Materials Research Center; Functional Nanomaterials and Devices Research Group
Publisher:
Elsevier BV
Journal:
Journal of Power Sources
Issue Date:
Jul-2013
DOI:
10.1016/j.jpowsour.2013.01.122
Type:
Article
ISSN:
03787753
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.
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorBai, Yaocaien
dc.contributor.authorBaby, Rakhi Raghavanen
dc.contributor.authorChen, Weien
dc.contributor.authorAlshareef, Husam N.en
dc.date.accessioned2015-08-03T11:11:47Zen
dc.date.available2015-08-03T11:11:47Zen
dc.date.issued2013-07en
dc.identifier.issn03787753en
dc.identifier.doi10.1016/j.jpowsour.2013.01.122en
dc.identifier.urihttp://hdl.handle.net/10754/562828en
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.en
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.en
dc.publisherElsevier BVen
dc.subjectfunctionalizationen
dc.subjectGrapheneen
dc.subjectHydrothermalen
dc.subjectpHen
dc.subjectSpecific capacitanceen
dc.subjectSupercapacitoren
dc.titleEffect of pH-induced chemical modification of hydrothermally reduced graphene oxide on supercapacitor performanceen
dc.typeArticleen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.contributor.departmentFunctional Nanomaterials and Devices Research Groupen
dc.identifier.journalJournal of Power Sourcesen
kaust.authorBai, Yaocaien
kaust.authorBaby, Rakhi Raghavanen
kaust.authorAlshareef, Husam N.en
kaust.authorChen, Weien
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