模拟光合作用Z型反应光催化分解水的初步研究

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1、上海交通大学硕士学位论文模拟光合作用Z型反应光催化分解水的初步研究姓名：冯清鹏申请学位级别：硕士专业：动力机械及工程指导教师：上官文峰;袁坚20070101模拟光合作用Z型反应光催化分解水的初步研究以−I/IO为中间体的光解水体系的产氢产氧性能，以及探讨了在真空3反应系统和排空反应系统中以K4Ce2Ta10O30和WO3为催化剂，以2+3+Fe/Fe为中间体的光解水体系的产氢、产氧性能。结果表明，以上三种光解水体系中并不能确定Z型反应是否实现，但在研究中发现，光催化剂的活性与反应器中压力有关，在真空条件下光催化剂的活性明显高于排空条件下光催化剂的活性。综上所述，在本论文中实现了Z型反应

2、光催化分解水同时产氢、产氧。在研究中得出的一些结论对下一步的工作有很好的借鉴意义。关键词：氢能，Z型反应，光解水，光催化剂，氧化还原中间体5模拟光合作用Z型反应光催化分解水的初步研究APHOTOCATALYTICSYSTEMSPLITTINGWATERINTOH2ANDO2MIMICKINGZ-SCHEMEMECHANISMABSTRACTHydrogenenergyiswellrecognizedasoneofthemostidealenergytosolvetheenergyandenvironmentalproblemsconfrontingthewholesocietycurr

3、ently,andthedevelopmentofhydrogenenergyhasbeenattractedmoreattention.Amongthesewaysandmethodsdeployedtodevelophydrogen,splittingwatertoH2usingsemiconductorphotocatalystsisoneofthemostpromisingandidealwayconsideringenergycost,resourceandenvironmentalissues.Itispossibletoemployvisiblelightbyphotoc

4、atalyticwatersplittingsystemmimickingZ-schememechanism.Thisdissertationbeganwiththeintroductionofthewaysofphotocatalyticwatersplitting,andexplainedthemechanismofthewatersplitting,typicalphotocatalysts,andthefactorswhichrelatetotheactivityofthephotocatalyst.SubsequentlythemechanismofZ-schemewater

5、splittingwasclarified.6模拟光合作用Z型反应光催化分解水的初步研究ThedissertationdiscussedtheinfluenceofthepHvalueandtheelectrondonor(orelectronaccecptor)totheactivityofWO3(orPt/TiO2).TheH2yieldofphotocatalyticwatersplittingofPt/TiO2reachtothe2+maximum,whenpH≈2andFeaselectrondonor.TheO2yieldofphotocatalyticwatersplit

6、tingofWO3reachtothemaximum,whenpH≈3+2andFeaselectronacceptor.Z-schemewatersplittingsystemwasconstructedbytwopowderedheterogeneousphotocatalystsPt/TiO2,WO33+2+andwithFe/Feredoxcoupleasanelectronrelay.Thesystemshowedoverallphotocatalyticwatersplittingcontinuouslyduring20hirradiationof300WXelamp.Al

7、sootherseveralwatersplittingsystemswereconstructedbyotherdifferentphotocatalystsanddifferentredoxcouple.Asfollowing:ThephotocatalyticwatersplittingcomposedofPt/TiO2as,WOasphotocalysttoproduceOand−−photocalysttoproduceH232I/I