srtiolt3gt储氢合金电极的光电化学与光充电性能

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1、浙江大学博士论文"ri02、SrTi03／储氢合金电极的光电化学与光充电性能膜晶化温度的升高先增大后减小，500℃晶化的薄膜的光电流、开路光电压最大。随着Nb掺杂浓度的增大，在我们的研究范围内(O．2％)，光电流和开路光电压都是增大。薄膜厚度对其光电流的影响较为复杂，不同的电位区间影响不同，外加电位<-0．71V时，阳极光电流和开路光电压随薄膜厚度先增加后减小，厚度为90nm时，阳极光电流最大。外加电位>．0．71V时，阳极光电流随SrTi03薄膜厚度的增加而增加。射频磁控溅射法制备的掺铌钛酸锶薄

2、膜的光充电性能的影响因素与光电流的影响因素相同，其趋势也相类似。光照480分钟后，SNH电极的最终电位及其相应的放电时时间随薄膜的晶化温度行增加后减少，在500℃时达最大，为一0．893V，190分钟。随着掺杂浓度的提高，相应的SNH电极的光充电的最终电位及其放电时间都增加，当Nb的掺杂浓度为2％时，其值分别为．0．9V，235分钟。随着薄膜厚度的增加，相应的SNH电极的光充电最终电位、放电时间先地加，后减少，当膜的厚度为90nln时，其光充电最终电位、放电时间分别为-0．893V，190分钟。关

3、键词：二氧化钛，钛酸锶，光充电，贮氢合金。II浙江大学博士论文1102、SrTi02／储氢合金电极的光电化学与光充电性能AbstractInordertOinventanewtypeofcells，whichcanbephotoehargeddirectly,somesemiconductorsuchasTi02nanoparticlesmodifiedwilllplatinum．strontiumtitanatcnanoparticlesandthinfilmswer；epreparedbydi

4、fferentmethods．Theifphotoclectrochemicalperformances，photochargeabilitytohydrogenstoragealloys，anditsmechanismwereinvestigated．The2-8nlnplatinumnanopartielesweredepositedphotoassistedlyOntitaniananopartieleswhosesizeswereabout20-50nnl．Thephotoehargeab

5、leelectrodes(TPMelectrodes)Wel'epreparedbymodifyingthehydrogenstoragealloyelectrodewitlltheas-prepared0．5Wt％Pt-loadedTi02powders．TheTPMelectrodescanbechargedbylight，buttheircyclenumbersweretOOsmall．TheTPMelectrodesCanbephotochargedagainwhentheelectrod

6、eswffreactivatednewlybysmallcurrent．WhentheTPMelectrodeswerechargedwithacurrentof0．2mAandilluminatedsimultaneously,thedischargetimewasabout630minutes，whichislongthanthesum(415minutes)ofthedischargedtimechargedonlywithcurrent(400minutes)andthat(15minut

7、es)chargedonlywithbylight．Atthesametime，therephotochargeabilityoftheTPMelectrodewasimprovedgreatly．WhenallUVphotoisabsorbedbyTi02，anelectron-holepairmaybegenerated．Thephotogenemtedholecannotonlyoxidizethewatertoproduce02andtheabsorbedHtoformH20，butals

8、omayoxidizethehydrogenstoragealloytoformMO，whichhindersthesoliddiffusionoftheHatom0nthesurfaceofTPMelectrode．WhentheTPMelectrodewasirradiatedandchargedwimacurrentof0．2mAsimultaneously,thecurrentcouldchargetheTPMelectrode．Furthermore，thecurrent