離子液體添加劑[BMIM]HSO4對(duì)鋅電積過程析氧反應(yīng)動(dòng)力學(xué)的影響.pdf

《離子液體添加劑[BMIM]HSO4對(duì)鋅電積過程析氧反應(yīng)動(dòng)力學(xué)的影響.pdf》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。

1、物理化學(xué)學(xué)~(WuliHuaxueXuebao1JanuaryActaPhys．一Chim．Sin．，2011，27(1)：149—155149【Article]www．whxb．pku．edu．cn離子液體添加劑【BMlM】HSO4對(duì)鋅電積過程析氧反應(yīng)動(dòng)力學(xué)的影響張啟波華一新(離子液體冶金重點(diǎn)實(shí)驗(yàn)室，昆明理工大學(xué)冶金與能源工程學(xué)院，昆明650093)摘要：研究了1-丁基-3-甲基咪唑硫酸氫鹽([BMIMIHSO)離子液體對(duì)鋅電積過程析氧反應(yīng)的影響．研究工作借助于動(dòng)電位極化，電化學(xué)阻抗譜，掃描電

2、鏡和X射線衍射等測(cè)試技術(shù)．動(dòng)電位極化曲線及對(duì)應(yīng)的動(dòng)力學(xué)參數(shù)分析表明，[BMIM]HSO對(duì)陽極析氧反應(yīng)具有催化作用，可提高析氧反應(yīng)速率常數(shù)．電化學(xué)阻抗譜數(shù)據(jù)表明，【BMIM]HSO能顯著降低陽極析氧電荷傳遞電阻，在所研究的1．85—2．10V電位范圍內(nèi)添加5mg．L?！綛MIM】HSO，電阻值至少降低50％．此外，添加劑對(duì)陽極表面二次反應(yīng)具有抑制作用，其在陽極表面的吸附，阻礙了陰離子的陽極活化位點(diǎn)吸附過程．電化學(xué)測(cè)試結(jié)果與長(zhǎng)時(shí)間(120h)陽極極化后所得陽極表面形貌和結(jié)晶取向分析結(jié)果相一致．[B

3、MIM]HSO的添加能有效抑制中間產(chǎn)物盧一PbO的形成，促進(jìn)鉛銀電極表面大塊且疏松多孔a-PbO：的生成，加速陽極析氧的進(jìn)行．關(guān)鍵詞：電化學(xué)阻抗譜：鋅電積：析氧：離子液體添加劑：表面形貌中圖分類號(hào)：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