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Citethis:J.Mater.Chem.A,2016,4,9072
YuanjuanBai,HuijuanZhang,YangyangFeng,LiFangandYuWang*
Nowadays,thesluggishkineticsoftheoxygenevolutionreaction(OER)hasbeenabottleneckfactorinwaterelectrolysis.Designingandsynthesizingsomematerials,withnovelandspeci?cmorphology,mayhopefullyrelievethepresentpuzzle.Herein,anovelsandwich-likeCoP/Cnanocompositewasdevelopedbyalow-temperaturephosphorizationmethodusingacarbon-encapsulatedCo-basednanosheetasaprecursor.Thecross-sectionimagesdirectlyshowthatthemonodispersedCoPnanoparticlesaresandwichedbetweentwothincarbonlayers.TheoutercoatingofCoPnanoparticlesservesasane?cientprotectivelayerandconductivemediumintheprocessofwaterelectrolysis.Remarkably,thesandwich-likeCoP/Cobtainsasmalloverpotentialofonly330mV(1.56Vvs.RHE)atacurrentdensityof10mAcmà2,whichisfavorablycomparedwiththecommercialIrO2/C(400mV),sandwich-likeCoO/C(450mV)andmacroporousCoP(610mV)catalystsweprepared.ThisCoP/CnanocompositealsopresentsbetterstabilityinalkalinesolutionthanthatofCoO/CandmacroporousCoP.WhatisimportantisthatthisexcellentOERperformancehasexceededmostCo-basedmaterialsreportedthusfar.Thesandwich-likeCoP/Cmaterialweobtaineda?ordsthepossibilityofthepursuitofrobust,low-costandhigh-e?ectiveOERcatalysts.
Received23rdApril2016Accepted6thMay2016DOI:10.1039/c6ta03392jm.kkreddy.com
?Electronicsupplementaryinformation(ESI)available:MoreXRD,SEM,andelectrochemicaltestdates.SeeDOI:10.1039/c6ta03392j
ardentlydesigned.7,9,10,14However,theoverallOERe?ciencyofCo-basedmaterialswilldegradeaeralong-termtestingonaccountoftheirintrinsicallyinferiorelectricalconductivityandlowactivesurfacearea.
Transition-metalphosphide(TMP)isamultifunctionalmaterialthatiswidelyusedintheeldsofenergyconversionandstorage,catalyst,magnetics,andphotoelectrics.15–17Quiterecently,studieshaveindicatedthatlikesomeTMPs(e.g.,Ni5P4andFe2P),cobalt-basedphosphideisnotonlyanexcellenttraditionalhydrogenevolutionreactionHERcatalystintheprocessofwatersplitting,butalsoapromisingOERcatalyst.8,18However,theOERcatalyticactivityofmostofthosecobalt-basedphosphidesisusuallyinhibitedbytheine?cientmassdi?usionofelectronsandsmallelectrodesurfacearea.Inaddition,thecatalyticstabilityislessthandesirable.Devel-opingalow-cost,high-activityandstrong-stableOERcatalystisalwayswhatweareaer.Thedesignandsynthesisofsomematerialswithanovelandspecicmorphologyhasbeenrepeatedlyproventobeagoodwaytooptimizetheelectro-chemicalperformance.19,20
Twodimension(2D)carbon-coatedcompositematerialshadarousedconsiderableinterestinenergystorageandconversionaccordingtothesynergetice?ectbetweencarbonandactivematerials.21,22Ingeneral,these2Dcarbon-involvedcompositematerialshavemanyadvantages,includinglargesurfacearea,greatstructuralstability,highchargetransfere?ciencyandshortelectrondi?usionpath.Therefore,aseriesof2Dsand-wich-likenanostructureswithFe2P,Ni2P,NiFeandFe-doped
9072|J.Mater.Chem.A,2016,4,9072–9079Thisjournalis?TheRoyalSocietyofChemistry2016
磷化钴 Sandwich like CoP-C nanocomposites as efficient and stable oxygen evolution catalysts.doc下载久久建筑网m.kkreddy.com提供大量：建筑图纸、施工方案、工程书籍、建筑论文、合同表格、标准规范、CAD图纸等内容。