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时间:2020-03-27
《表面稳定单质铜的介孔二氧化钛的光催化产氢性能.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第32卷第6期无机化学学报Vol_32No.62016年6月CHINESEJOURNALOFINORGANICCHEMISTRY1063.1070表面稳定单质铜的介孑L二氧化钛的光催化产氢性能刘娟娟乔培胜过军芳邹世辉肖丽萍范杰(浙江大学化学系,杭州310027)摘要:采用十二烷基硫醇作为保护剂有效地稳定住了光催化过程中介孔二氧化钛一Ti02)表面原位生成的Cu。物种。通过X射线衍射.X射线光电子能谱.高分辨透射电镜,高角环形暗场扫描透射电镜等手段对催化剂的组成结构进行了表征,发现催化剂中仅有Co物
2、种存在在紫外光照射下.以甲醛水溶液为牺牲试剂测试了Cu~物种对介孑L二氧化钛产氢性能的影响,发现适量的Cuo纳米颗粒能够极大地提高介孔二氧化钛的产氢性能。当Cu~的物质的量分数为1.O%时,Cu~/m.TiC表现出最高的产氢速率,为725m01.hg~。该样品中Cuo纳米颗粒的尺寸为(4.2±O.9)nin。此外,通过气相色谱检测到产生的H2和C0的物质的量之比为2:1.表明部分氢气来自于水分解关键词:单质铜;介孔二氧化钛;光催化产氢;甲醛中图分类号:0643.3:0614.411:0614.12
3、1文献标识码:A文章编号:1001.4861(2016)06—1063—08DoI:10.11862/C:JIC.2016.143StabilizingMetallicCu~ontheSurfaceofm·TiC2forPhotocatalyticH2ProductionLIUJuan—JuanQIAOPei—ShengGUOJun—FangZOUShi—HuiXIAOLi—PingFANJie(DepartmentofChemistry,ZhejiangUniversity,Hangzhou,Z
4、hejiang310027,China)Abstract:DodecanethiolwasintroducedasaprotectiveagenttostabilizetheinsitugeneratedCu。speciesonthesurfaceofmesoporousTiO2fm—TiO2).Theas—producedsampleswerecharacterizedbyXRD,XPS,HRTEMandHADDF—STEM.ItiSnotewo~hythatonlyCu0specieswere
5、detectedinthesesamples.ThesystemthusservedasanexcellentmodeltoinvestigateCu~一incorporatedm—TiO2.PhotoeatalyticmeasurementssuggestedthattheCu。speciescouldgreatlyenhancethephotocatalyticH2一evolutionactivityofm—Ti02in~rmaldehydesolution.Moreover.wef0undt
6、hattheactivitydependsontheconcentrationofCu。.ThemaximumH2evolutionrateof725p~mol·h·gisobtainedon1.0%Cu/m—TiC2,withaverageCu~particlesizeof(4.2±0.9)nm.Itisinterestingtofindthatinourcase,themolarratioofproducedH2toCO2is2:1,whichindicatestheinvolvementof
7、H20ashydrogensource.Keywords:Cu。species;mesoporousTiC2;photoeatalytieH2evolution;formaldehydeHydrogen(H2)hasbeenconsideredasapromisinggases(NOors02)andparticulatematters[7-9].Fromafuelcandidateofnextgenerationinindustriesduetoclean—energyperspective,f
8、abricatingemission-freeitshighenergycapacity(142MJ·kg),en-dronmentalpathwaytoproducehydrogenisimportantforapplica-friendlinessandrecyclingpossibility【卜句.Currently.H2tionsof“hydrogeneconomy”.whichdrivepeopleSismainlyproducedbysteamreformingoffo
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