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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Solutionphasesynthesisofhalogenatedgrapheneandtheelectrocatalyticactivityforoxygenreductionreaction
DOI: 10.1016/S1872-2067(14)60108-X, PP. 884-890
Keywords: Halogen-doping,Sulfur-doping,Graphene,Oxygenreductionreaction,Electrocatalyst
Abstract:
？Metal-freecarbonelectrocatalytsfortheoxygenreductionreaction(ORR)areattractivefortheirhighactivityandeconomicadvantages.However,theoriginoftheactivityhasneverbeenclearlyelucidatedinasystematicmanner.Halogengroupelementsaregoodcandidatesforelucidatingtheeffect,althoughithasbeenadifficulttaskduetosafetyissues.Inthisreport,wedemonstratethesynthesisofCl-,Br-andI-dopedreducedgrapheneoxidethroughtwosolutionphasesyntheses.WehaveevaluatedtheeffectivenessofdopingandperformedelectrochemicalmeasurementsoftheORRactivityonthesehalogenatedgraphenematerials.OurresultssuggestthatthehighelectronegativityofthedopantisnotthekeyfactorforhighORRactivity;bothBr-andI-dopedgraphenepromotedORRmoreefficientlythanCl-dopedgraphene.Furthermore,anunexpectedsulfur-dopinginacidicconditionssuggeststhatahighlevelofsulfidecandegradetheORRactivityofthegraphenematerial.
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