简介：

简介：

简介：Themicrostructureevolutionandphasecompositionofanα+βtitaniumalloy,Ti-3Al-5Mo-4.5V(wt.%),havebeeninvestigated.Electronprobemicroanalysis(EPMA)quantitativeresultsmanifestthatthestabilityofβphasedecreaseswithincreasingquenchingtemperature,whichisinfluencedbythesignificantvariationofβ-stabilizingelementsconcentration.Detailedmicrostructureanalysisshowsthattheβ→ωphasetransformationdoesoccurwhenquenchingat750℃and800℃.Theω-reflectionschangefromincommensurateω-spots(750℃)toidealω-spots(800℃)astheβstabilityofthealloydecreases.Furtherthedecreaseofβphasestabilityencouragestheformationofathermalα"martensite,whichhasthefollowingorientationrelationships:[111]β//[110]α",[100]p//[100]α"and[-110]p//[00-1]α"withrespecttotheβmatrix.

简介：

简介：Theyolk-shellFe3O4@Cnanocubesweresuccessfullysynthesizedthroughcarbothermicreductionprocessfromcarbon-coateda-Fe2O3precursor.Theresultsshowthattheyolk-shellFe3O4@Cnanocubesareuniformlycoatedwithathincarbonlayer,andaclearcavityabout150nminwidthbetweenFe3O4coreandcarbonshellareformedduetothevolumeshrinkageduringthereductiontreatment.Theobtainedyolk-shellFe3O4@Cnanocubesexhibitexcellentcyclingstability(thedischargecapacityis709.7mAh/gafter100cyclesatthecurrentdensityof0.1C)andrateperformance(1023.4mAh/gat0.1C,932.5mAh/gat0.2C,756.1mAh/gat0.5C,405.6mAh/gat1C,and332.3mAh/gat2C,andmoreimportantly,whenthecurrentdensityfinallybacksto0.1C,acapacityof776.8mAh/gcanberestored).Theoutstandinglithiumstoragepropertiesmaybeattributedtotheuniqueyolk-shellstructures.

简介：

简介：Inpursuingexcellentsupercapacitorelectrodes,wedesignedaseriesofM0S2/C0S2compositesconsistingofflower-likedMoS2andoctahedron-shapedCoS2throughafacileone-stephydrothermalmethodandinvestigatedtheelectrochemicalperformanceofthesampleswithvarioushydrothermaltime.Duetothecouplingoftwometalspeciesandabigamountofwell-developedCoS2andMoS2,theresultsindicatedthattheMoS2/CoS2compositeselectrodesexhibitedthebestelectrochemicalperfor-mancewithalargespecificcapacitanceof490F/gat2mV/sor400F/gat10A/gamongallsamplesasthehydrothermaltimereached48h(MCS48).Furthermore,theretentionofMCS48is93.1%after10000cyclesat10A/g,whichmanifeststheexcellentcyclingstability.TheoutstandingelectrochemicalperformanceofMCS48indicatesthatitcouldbeaverypromisingandnovelenergystoragematerialforsupercapacitorsinthefuture.