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时间:2020-03-27
《离子液体添加剂[BMIM]HSO4对锌电积过程析氧反应动力学的影响.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、物理化学学~(WuliHuaxueXuebao1JanuaryActaPhys.一Chim.Sin.,2011,27(1):149—155149【Article]www.whxb.pku.edu.cn离子液体添加剂【BMlM】HSO4对锌电积过程析氧反应动力学的影响张启波华一新(离子液体冶金重点实验室,昆明理工大学冶金与能源工程学院,昆明650093)摘要:研究了1-丁基-3-甲基咪唑硫酸氢盐([BMIMIHSO)离子液体对锌电积过程析氧反应的影响.研究工作借助于动电位极化,电化学阻抗谱,扫描电
2、镜和X射线衍射等测试技术.动电位极化曲线及对应的动力学参数分析表明,[BMIM]HSO对阳极析氧反应具有催化作用,可提高析氧反应速率常数.电化学阻抗谱数据表明,【BMIM]HSO能显著降低阳极析氧电荷传递电阻,在所研究的1.85—2.10V电位范围内添加5mg.L。‘【BMIM】HSO,电阻值至少降低50%.此外,添加剂对阳极表面二次反应具有抑制作用,其在阳极表面的吸附,阻碍了阴离子的阳极活化位点吸附过程.电化学测试结果与长时间(120h)阳极极化后所得阳极表面形貌和结晶取向分析结果相一致.[B
3、MIM]HSO的添加能有效抑制中间产物卢一PbO的形成,促进铅银电极表面大块且疏松多孔a-PbO:的生成,加速阳极析氧的进行.关键词:电化学阻抗谱:锌电积:析氧:离子液体添加剂:表面形貌中图分类号:0646EffectoftheIonicLiquidAdditive一[BMIM]HSO4ontheKineticsofOxygenEvolutionduringZincElectrowinningZHANGQI.BoHUAY._Xin(KeyLaboratoryofIonicLiquidsMetal
4、lurgy,FacultyofMetallurgicalandEnergyEngineering,KunmingUniversityofScienceandTechnology,Kunming650093,PR.China)Abstract:Theefectoflheionicliquidadditive1-butyl-3一methylimidazoliumhydrogensulfate([BMlM】HSO4)onthekineticsofoxygenevolutionduringzincele
5、ctrowinningfr0manacidicsulfatesolutionwasinvestigated.Weusedpotentiodynamicpolarization,electrochemicalimpedancespectroscopy,scanningelectronmicroscopy,andX—raydiffractionforthisstudy.Potentiodynamicpolarizationcurvesandthecorresp0ndingkineticparamet
6、eranalysisshowthat【BMIM]HSO4hasacatalyticefectonoxygenevolutionbystimulatingthereactionrateconstant.ImpedancedatareveaIthat『BMlM]HSO4canmarkedlyreducetheoxygenevolutionchargetransferresistance.Theadditionof5mg·L『BMIM]HSO4obviouslydecreasedtheresistan
7、cevaluebyatIeast50%overthestudiedpotentiaIrangefr0m1.85tO2.1OInaddition,theresultsoftheimpedancemeasurementsalsosuggestaninhibitioneffectof『BMlM]HSO4onthesecondaryreactionsandthisiSduetotheadsorptionoftheadditiveontheanodeSUrface,whichdecreasedtheamo
8、untofactivesitesforanionadsorption.AlIelectrochemicaIresultswerecorroboratedwithamorphologicalandorientationanalysisoftheanodicsurfaceafter120hofanodicpolarization.Theadditionof【BMlM]HSO4inhibitedthegenerationoftheintermediateproduct/3.PbO2anditpromo
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