Influence of the Synthesis Parameters in Carbon Nanotubes Doped with Nitrogen for Oxygen Electroreduction 2017 I. Zeferino González.pdf

该【Influence of the Synthesis Parameters in Carbon Nanotubes Doped with Nitrogen for Oxygen Electroreduction 2017 I. Zeferino González 】是由【赖大文档】上传分享，文档一共【5】页，该文档可以免费在线阅读，需要了解更多关于【Influence of the Synthesis Parameters in Carbon Nanotubes Doped with Nitrogen for Oxygen Electroreduction 2017 I. Zeferino González 】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。ECSJournalofSolidStateScienceandTechnology,6(6)M3135-M3139(2017)M3135JSSFOCUSISSUEONNANOCARBONS—INMEMORYOFSIRHARRYKROTOIn?,′-Muniz,?-Nunez,?′?as,′a,zologico′deCancun,′Cancun′77500,Mexico′bUniversidadNacionalAutonoma′deMexico,′olog′?a,,Mexico′Nitrogendopedcarbonnanotubes(Ts)weresynthesizedbymodi??owwereinvestigatedusingscanningelectronmicroscopy,transmissionelectronmicroscopy,Ramanspectroscopy,X-?owratehavein?uenceonthephysical,,?owrategeneratemoredefects,?owrateshowbetterelectrocatalyticactivitytowardoxygenreductionreactionwithpromisingloweronsetpotentialandcurrentdensitiesupto80%paredtotraditionalPt/,mainlypyrrolicandpyridinicincorporatedinthecarbonlattice.?TheAuthor(s),/licenses/by//),whichpermitsunrestrictedreuseoftheworkinanymedium,providedtheoriginalworkisproperlycited.[DOI:],2016;revisedmanuscriptreceivedFebruary15,,–,platinum(pureandPtalloys)hasbeentheExperimentalbestandwellknownelectrocatalystfortheoxidationandreductionTssynthesis.—,scarcity,highpriceanddegradationbytheM--Pyridine(%,Merck,carbonandnitrogensource),2Inrecentyears,therehavebeeneffortstoreduce(98%,Aldrich,metalcatalyst)-theplatinumloading,;?rstthesolutionwaspre-heatedinahome-madeItisthereforenecessarytodevelopnon-Ptcatalyticmaterialsavail-vaporizerconnectedtoatubularfurnacewherethesynthesistakesable,(Ts)havereachedthepointtosynthesis,thefurnacewascooleddownandthe?nalproductswereeanalternativecatalystforoxygenreductionreaction(ORR)-,Tsweretreatedwithconcentratednitricsynthesisofcarbonnanotubesdopedwithnitrogenatomsusingdif-acidinare??owrateandtheferentcarbon-nitrogenprecursorsusingchemicalvapordepositionsynthesistemperaturewerethetwovariablesconsideredforthepara-(CVD)methodandhavingagoodelectrocatalyticactivityforoxy-metricstudy,withtwolevelseachone(lowandhigh).-?cantlymoreactivityforORRthanthefree--Physicalandchemicalcharacterization.—Scanningelectronmi-gensources:aniline(A),diethylamine(DEA)(SEM).%-dispersiveX-.%.%N,(EDS)attachedtotheSEMwasusedtodeterminechem-studies1,5–,?edChemicalVaporDeposition(M-CVD)usingpyridineasnitrogenandcarbonsourceandtheelec-trochemicalstudyoftheeffectsoftwoparameters,suchasthesyn-thesistemperatureandcarriergas?--mail:******@?-03-(/site/terms_use)Licenseinplace(seeabstract).M3136ECSJournalofSolidStateScienceandTechnology,6(6)M3135-M3139(2017)?owrate(Lmin?1)(?C)(TEM)imagingwasperformedonaJEOLJEM-2200FStoprovidehighres-(LabRAMHe-Nea)800?Candb)900??1)wasutilizedforinvestigat-ingthe?rstorderRamanscatteringofthesamplesandtoknowthe?,?Tssynthesizedat900Cshowlargeryieldsthanthoseprepared?obtainedbymeansofanXPSspectrometerfromSPECSGmbH,at800C,-Raysource(μ-FOCUS500)(hν=1,).Measurementswereperformedunderareidenti?-likestructuresareobserved,ultra-highvacuumconditionswithaworkingpressurelowerthan2whichisthetypicalcarbonarrangementofnanotubeswhendoped×10?–64nm??overnightinhighvacuuminthepreparationchamberbeforetheyand67–96nmfor800Cand900Csamples,,13Scanningandtransmission1eVstepsize,whilehigh-resolutionenergyregionswitharangeof30electronmicroscopiesdidnotshowevidenceofeffectsofthe?(N1s,C1sandO1s)positionanalysisusingSEM-,,andwerescannedwithseveralindicatedthepresenceofcarbon,iron,nitrogenandoxygen,asshowssweepsuntilareasonablesignal-to-noiseratiowasobserved(20–).-withthebamboo-likestructuretypicalinnitrogencarbondoped,.???,corre-(CasaSoftwareLtd.,UK)byusingaGaussian/Lorentzian(70/30)spondingtorespectiveDandGbands,,,iscausedbyatomicdisplacementandoncentrationsandratioswerecalculatedbyusingpeakareaslatticedefects,whileGbandindicatestheformationofwellgraphi-,,16Oxygenreductionreactionactivityevaluation.—Theelectro-TheobtainedaveragevaluesforID/IGandIG′/Tschemicalevaluationwascarriedoutinarotatingdiskelectrode(RDE),theDfromBASiandcoupledtoanEpsilonpotentiostat/galvanostattocon-bandintensityisslightlysmallerthantheGbandintensity,,(),Ag/Tssamples,Dbandintensityisgreaterthan(saturatedin3molL?1KCl)electrode,andaplatinumwire,,anydistortioninthehexagonallatticeofpureasasworking,referenceandcounterelectrodes,-,dataT,?onshowaclearincrementintheID/paredtowatersolution(1:3),?,theelectrolytewassaturatedwithargongasandacyclicvoltammetryperformed(?),,oxygengaswasintroducedtosaturatethesolutionandexperimentsweredoneatascanrateof5mVs?,,arereferredtothestandardhydrogenelectrode(SHE).ResultsandDiscussionTssamplespreparedata)800?Candb)900?)800?Cand?800Chaveblocklengthsbetween20and58μm,whilenanotubesb)900?-03-(/site/terms_use)Licenseinplace(seeabstract).ECSJournalofSolidStateScienceandTechnology,6(6)M3135-M3139(2017)-?Cat.%Feat.%Nat.%Oat.%±±±±±±±±±±±±±±±±?Samplenameswerecon?’(or2D).ThisisanovertoneoftheDbandandtheintensityratio21,22inthestructureofthenanotubes,whichreducestheorderingoftheIG’/,20TheIG’/IGintensityratioshowsthatthedegreeofcrystallineperfec-TsID/Ttemperatures,itcanbenoticedthesamplesgrownat900??-?owrateeffectcanalsobeappreciatedsincethelowerthe?owreaction(ORR),,Figure5ashowspolarizationcurvesatdifferentrotationspeeds,?1thereisaband,around2657cm,?-)SampleB9atseveralrotationspeeds;b)-03-(/site/terms_use)Licenseinplace(seeabstract).M3138ECSJournalofSolidStateScienceandTechnology,6(6)M3135-M3139(2017))B8andb),between100andnitrogencontent,,-25,26,2828Figure5bshowslinearsweepvoltammogramsofstudiedsamplesditions()%Pt/C,-(600–900?C)toaffectsigni?cantlythelimitingcurrentdensity;sam-?rentplateauisnotformed,indicatingpoororlackofORRactivity,plesat900CexhibitedgreaterjLandthereforebettercatalyticactiv-normallyshowedforunmodi?