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ID:34829268
大小:4.13 MB
页数:65页
时间:2019-03-12
《镍基ni-s电极及其析氢性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、㈣鞘荆天津人学T程颂十学位论文镍基Ni—S电极及其析氢性能研究ResearchofthePreparationofNi—basedNi—Selectrodeandit’Scapabilityofhydrogenevolution~级学科:化学工程与技术学科专业:化学工程作者姓名:刘晓峰指导教师:单忠强副教授王少波研究员天津大学化工学院2008年9月3曰摘要随着经济的高速发展,水电解制氢装置的应用范围也越来越广,研制高催化活性的新型电极,对于降低电解能耗具有十分重要的意义。本论文主要研究了电流密度、镀液温度、电沉积时间、镀液PH值、硫脲浓度等电沉积工艺参数以及电解液温度和
2、电解对镀层结构、形貌和析氢性能的影响,并模拟了在工业电解水工况下电极的电化学活性和稳定性。实验结果表明:电沉积过程中,电流密度为30mA·cm~、镀液温度为45℃、时间为60~80min、镀液pH为4、硫脲浓度为1009·Lo时,Ni.S镀层具有优良的表面积和非晶化程度,表现出最佳的析氢活性;电解液温度对电极析氢性能影响非常明显,随着温度的升高,电极析氢电位不断降低,且在600C以下受温度影响更明显。镀层电解后,晶化明显,晶粒变得更细更均匀,形成了更多的Ni3S2活性中心,析氢电位变低,比电解前降低约100mV。模拟工业使用工况实验表明,Ni.S电极具有高催化活性和高稳
3、定性,能有效的降低电能的消耗,必将具有广阔的应用前景。关键词:水电解,电沉积,Ni-S电极,析氢ABSTRACTWithrapiddevelopmentofeconomy,thegeneratedhydrogenequipmentbywaterelectrolysiswasbrodelyappilied.Sotheresearchofnewtypeelectrodewithhighactiveofcatalysisismuchsignificative.Inthispaper,theeffectsofelectrodposittechnicalparameters(in
4、cludingcurrentdensity,temperatureofelectroplatesolution,timeofelectrodposit,pHvalueofelectroplatesolution,andconcentrationofTU),temperatureofelectrolyteandelectrolysisonstructure,appearanceandcapabilityofhydrogenevolutionwerestudied.Inaddition,electrochemicalactiveandstabilityofelectrode
5、weresimulatedundertheconditionofindustrialwaterelectrolysis.Theresultsofexperimentsshowthat:Ni-Selectrodehasoptimalcapabilityofhydrogengenerationwithcurrentdensity30mA。cm《,temperatureofelectroplatesolution45。C,time60-80min,pHofelectroplatesolution4,andconcentrationofTU1009‘L~.Theeffectof
6、electrolytetemperatureoncapabilityofhydrogengenerationwasobvious.Withtemperatureincreasing,theelectrodepotentialofhydrogengenerationdecreasedgradually,andmoreobviouslywhentemperaturewasunder600C.Afterelectrolysis,thecrystallizationofelectroplatelayerbecomeobvious,thecrystalparticlemoreun
7、iformandtheactivecenterNi3S2more.Theover-potentialofhydrogengenerationdecreasedbyabout100mV.TheresultsofsimulationexperimentsundertheconditionofindustrialwaterelectrolysisshowsthatthecatalysisactiveandstabilityofNi-Selectrodewerehigh,thiselectrodecandecreaseconsumeptionof
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