简介:Thedevelopmentofthehydrogenelectrodeisvitalfortheapplicationofalkalinepolymerelectrolytefuelcells(APEFCs).Inthisstudy,aseriesofNi(OH)2decoratedNi/Ccatalysts(Ni(OH)2-Ni/C)werepreparedbyathree-stepelectrochemicaltreatmentofNi/C.TheexistenceofNi(OH)2wasdemonstratedbyX-rayphotoelectronspectroscopy(XPS),andthesurfacemolarratioofNi(OH)2/Niofthesampleswasestimatedviaanelectrochemicalmethod.TheHORcatalyticactivityofthecatalystswasevaluatedbyarotationdiskelectrode(RDE)method,anda'volcanoplot'wasestablishedbetweentheHORexchangecurrent(j0)andthesurfacemolarratioofNi(OH)2/Ni.Ontopofthe'volcano',thesurfacemolarratioofNi(OH)2/Niis1.1:1,thej0ofwhichwas6.8timesofthatofNi/C.ThestabilityofthesamplestowardHORwasevaluatedtobegood.OurstudyaddedasystematicexperimentalevidencetotheHORresearch,showingthattheHORcatalyticactivityofNicanbedeliberatelycontrolledviadecorationofNi(OH)2,whichmayhelpunderstandingtheHORmechanismonNi.
简介:由Synechcoccus在Ni的简历累积上影响因素在这篇论文被学习。当到干燥重量集中ofSynechcoccus的Ni的集体比率是16-18%时,简历累积在附近是在水的solution.Bioaccumulation数量的80min的Ni的使平衡时间到达了最大值。Bioaccumulation数量与增加pH增加了。最佳pHwas9-10和更高的pH导致了Ni的降水(哦)_2。Bioaccumulation数量被在35℃到达他们的optima的温度和轻紧张也影响,无生命的水藻的3000Ixrespectively.Bioaccumulation比生活水藻的大。
简介:HomogeneousNi2+-dopedtitaniagelwassynthesizedbyasol-gelprocess,andthexerogelwasthenobtainedthroughaginganddrying,leadingtotheformationofNi/TiO2nanocompositeafterheattreatmentunderasuitablereducingatmosphere.TheresultingnanocompositewascharacterizedbyTGA-DSC,TEM,XRDandBETmethods.Theresultsshowthatthestructureandgrainsizeofthenanocompositescouldbemanipulatedbyalteringtheheat-treatmentconditions,andthatthenanocompositepossessesamesoporousstructurewithaporeradiusofca.28nmandaspecifictheanatase-rutilephasetransformation.
简介:Threetypesofcarbonnano-onions(CNOs)includingNi@CNOs.Fe3C@CNOsandFe0.64Ni0.36@CNOsnanoparticleshavebeensynthesizedbycatalyticdecompositionofmethaneat850℃usingnickel,ironandiron-nickelalloycatalysts.Comparativeandsystematicstudieshavebeencarriedoutonthemorphology,structuralcharacteristicsandgraphiticcrystallinityoftheseCNOsproducts.Furthermore,theelectrochemicalhydrogenstoragepropertiesofthreetypesofCNOshavebeeninvestigated.MeasurementsshowthattheNi@CNOshavethehighestdischargecapacityof387.2mAh/g,coiTespondingtoahydrogenstorageof1.42%.ThiscomparisonstudyshowstheadvantagesofeachcatalystinthegrowthofCNOs.enablingthecontrollablesynthesisandtuningthepropertiesofCNOsbymediatingdifferentmetalsandtheiralloyforusinginthefuelcellsystem.
简介:Ni/Mo2NasaHighlyActiveHydrodenitrogenationCatalystNi/Mo2NasaHighlyActiveHydrodenitrogenationCatalyst¥WenYuZHANG;XinPingWANG;...
简介:HydrotalciteprecursorsofLamodifiedNi-Al2O3andNi-SiO2catalystspreparedbyco-precipitationmethodandthecatalyticactivitieswereexaminedfortheproductionofCOx-freeH2byCH4decomposition.Physico-chemicalcharacteristicsoffresh,reducedandusedcatalystswereevaluatedbyXRD,TPRandO2pulsechemisorptions,TEMandBET-SAtechniques.XRDstudiesshowedphasesduetohydrotalcite-likeprecursorsinovendriedformproduceddispersedNiOspeciesuponcalcinationinstaticairabove450C.Ramanspectraofdeactivatedsamplesrevealedthepresenceofbothorderedanddisorderedformsofcarbon.Ni-La-Al2O3catalystwithamoleratioofNi:La:Al=2:0.1:0.9exhibitedtremendouslyhighlongevitywithahydrogenproductionrateof1300molH2mol1Ni.AdirectrelationshipbetweenNimetalsurfaceareaandhydrogenyieldswasestablished.
简介:ThepartialoxidationofethanoltohydrogenwasinvestigatedoverNi/Fe/Lacatalystspreparedbytheco-precipitationmethod.TheeffectsofintroductionofLapromoterandthereactiontemperatureonthecatalyticperformancewerestudied.ItwasfoundthattheintroductionofLaintoNi/Fecatalystsishelpfultoincreasetheselectivitytohydrogenandthestabilityofthecatalysts.TheresultsofXRDandXPScharacterizationshowthatthestructureofthecatalystwaschangedduringthereaction.TheexistenceofLaFeO3speciesispossiblythemainreasonoftheincreaseofthecatalyststability.
简介:当考虑热传导时,阶段地建模途径被用来学习纯Ni的氧化行为。在这计算,温度T上的Cahn-Hilliard方程Lc的系数的依赖被考虑。到这个目的,为纯Ni当模特儿的高温度的氧化实验和阶段地在600点在气压下面在空中被执行,700,并且\(800\,^{\circ}\hbox{C}\)。氧化率被thermogravimetry测量,在这些温度的Lc经由交互算法是坚定的。与Lc\({构造的-}T\)关系,Ni的氧化行为当考虑热时,传导被调查。氧化度,氧化物电影厚度,和特定的重量获得上的温度边界的影响被讨论。当模特儿的途径在这研究建议了的阶段地将给氧化抵抗分析的一些热点和热保护材料的冷却措施设计。
简介:AMonteCarlosimulation,withtheenergeticsdescribedbytheembeddedatommethod,hasbeenemployedtostudythephysicalbehaviourofboronatomsduringrelaxationoftheNi3AlBxgrainboundary,IthasalsobeenusedtocalculatenotonlythepeakconcentrationsofNiandBandthevalleyconcentrationofAlatthegrainboundary,butalsothedependenceofthegrainboundarycohesionontheBbulkconcentration.DuringrelaxationofimpureNi3Algrainboundaries,wesuggestthat,asthesegregatingspecies,theBatomseitherinsertintointersticesinthegrainboundaryorsubstituteNiatoms.Meanwhile,astheinducingspecies,theyinduceNiatomstosubstituteforAlatoms.Calculationsshowthatintheequilibrium,whentheBbulkconcentrationxincreasesfrom0.1to0.9thepeakconcentrationofBincreases,thepeakconcentrationofNimaximizeswhilethevalleyconcentrationofAlminimizesatx=0.5,Thecalculationsalsoshowthebestcohesionofthegrainboundaryatx=0.5。
简介:Asamemberof1Dnanostructuredmaterials,theferromagneticandnonmagneticmultilayernanowiresexhibittremendouspotentialapplicationsinmanyfieldsduetotheiruniquemagneticandelectricalproperties.Thebasicpropertyofmultilayernanowirearrays,suchascoercivity,iscrucialimportantforthefutureapplication.Inordertoobtainthecoercivityinformation,besidesdirectlymeasuringitthroughexperiment,theoreticalcalculationalsoprovidesausefulandfastwaytoevaluatethemultilayer’scoervicity.Fig.1(a)and(b)demonstrateasinglemultilayernanowireandnanowirearraysembodiedinamatrix,respectively.Inthiswork,byimprovingPant’smodel,wedevelopedthenewmodelandsuccessfullypredictedtherelationshipbetweenthecoercivitychangingofCu/Nimultilayernanowirearraysandstructualparameters.Fig.
简介:AdsorptionofhydrogenmoleculesonanNi-doped(8,0)single-walledcarbonnanotube(SWNT)isinvestigatedbyusingfirst-principlesdensityfunctionalcalculations.TheresultshowsthatasingleNiatomadsorbedonthebridgesiteofthetubecouldcannotdissociatetheH2,howeveritcanchemisorbthreeH2atmost,withtheaveragebindingenergyperH2suitableforthehydrogenstorageattheroomtemperature.MoreH2wouldphysisorbaroundanNiatomweakly.AsfortheSWNTwithanNidimeradsorbed,wefindthatwhentheH2approachestheNi-Nibond,itdissociateswithoutovercominganybarrierandmakesbondswithNiatom.
简介:Immobilizingbiocomponentsonsolidsurfacesisacriticalstepinthedevelopmentofnewdevicesforfuturebiological,medical,andelectronicapplications.Therefore,numerousintegratedfilmswererecentlydevelopedbyimmobilizingdifferentproteinsorenzymesonelectrodesurfaces.Inthiswork,hemeproteinsweresafelyimmobilizedontomacroporousnickel-basedelectrodeswhilemaintainingtheirfunctionality.Suchmodifiedelectrodesshowedinterestingpseudo-capacitivebehavior.Amonghemeproteins,hemoglobin(Hb)filmhasahigherelectrochemicalperformanceandgreatercharge/dischargecyclingstabilitythanmyoglobin(Mb)andcytochromeC(CytC).Thehemegroupinanalkalinemediumcouldinducetheformationofsuperoxidesontheelectrodesurface.Thesecapacitivefeaturesofhemeprotein-NielectrodewererelatedtostrongbindingsitesbetweenhemeproteinsandporousNielectrode,theaccumulationofsuperoxideorradicalsontheNisurface,andfacileelectrontransferandelectrolytediffusionthroughthethree-dimensionalmacroporousnetwork.Thus,thesenewprotein-basedsupercapacitorshavepotentialuseinfree-standingplatformtechnologyforthedevelopmentofimplantableenergy-storagedevices.
简介:一个各向异性的micromechanics模型基于相等的包括方法被开发调查基于Ni的单个水晶superalloys的rafting方向。micromechanical模型考虑实际立方的结构和直角的anisotropy性质。当适用时,在micromechanical模型的不同包括的von协定压力,有弹性的紧张精力密度,和静水力学的压力被计算一张力或压缩装载[001]方向。计算结果能成功地为展出的合金预言rafting方向一积极或否定失配,它与能接受的试验性、理论的研究一致。而且,矩阵的有弹性的经常的差别和失配度并且猛抛rafting方向上的阶段和他们的影响小心地被讨论。
简介:Wehaveshownthat,incontrasttotheresultsintheliterature,theBraggpeakintensityofNi80Fe20/Cusuperlatticesisenhancedattheincidentx-rayenergyslightlyhigherthantheabsorptionedgeoftheheavierelement(Cu).TheatomicdensityatNi80Fe20/Cuinterfacewasanalysedbythediffractionanomalousfinestructuretechnologywiththeincidentangleofx-rayfixedatthefirstBraggpeak.OurresultsdemonstratetheepitaxygrowthofNi80Fe20/Cusuperlattices.Uponannealing,theepitaxityofNi80Fe20/Cumultilayersbecomespoorbutthelocalcrystallinityineachlayerisimproved.
简介:Thecrystalstructureof[Ni(TAAB)(py)2](BF4)2,whereTAABisthetetradentatemacrocyclicligandtetrabenzo[b,f,j,n][1,5,9,13]tetraazacyclohexadecine,hasbeendeterminedfromX-raydiffractionanalysis.Thecrys.taibeiongstomonoclinic,spacegroupP21/nwithcellparameters