5694

5316

كارشناسي ارشد

شيمي تجزيه

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1389

هجده،93ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

بهزاد رضايي

علي اصغر انصافي

21/12/89

محمدتقي جعفري، محمد ژياني

شيمي

ID5316

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Influence of alkyl and cyclo alkyl ammonium hydrogen sulfate ionic liquids on the electrochemical and corrosion behavior of lead acid batteries Ahmad reza Taghipour Jahromi a taghipourjahromi@ch iut ac ir 20 December 2010 Department of chemistry Isfahan University of Technology Isfahan 84156 83111 I R IRAN Degree M Sc language farsi Prof B Rezaei rezaei@ch iut ac ir Abstract Nowadays the application of ionic liquids for improving characterization of lead acid batteries is an important issue In this work ionic liquids ILs mono bicycyclohexyl monohexyl and tetrahexyl ammonium hydrogen sulphate was applied as electrolyte additives on the electrochemical performance of lead acid batteries The electrochemical and corrosion behaviors of Pb 1 66 Sb 0 24 Sn alloy in sulphuric acid solution are investigated in the presence of mentioned ILs differing in the number of alkyl or cycloalkyl branches Particularly the hydrogen and oxygen evolution potential and anodic layer characteristics were investigated using cyclic linear sweep voltammetric electrochemical impedance spectroscopy EIS and Tafel plotes methods in the various concentrations of ILs as electrolyte additives in 4 0 mol dm 3 sulphuric acid The obtained results indicate that hydrogen evolution overpotential of lead antimony tin alloy increases in the solution containing ILs and mainly depend on the concentration of ILs and number of alkyl and cycloalkyl branches on the cations So the difference between oxygen oxidation potential in anodic and cathodic scans E decreases using different ILs Hence by increasing the number of alkyl or cycloalkyl branches of ILs corrosion rate of lead alloy decreases whereas inhibition efficiency IE which is obtained from polarization measurements shows a reverse effect The corrosion potential Ecorr has been shifted to the positive potential for all the concentrations and kinds of ILs Also compared to hexyl forms the cyclohexyl ILs have a lower corrosion rate and higher inhabitation efficiency Therefore the adsorption model of the ILs on the alloy surface was proposed Key words Lead acid batteries Ionic liquids Alkyl and cycloalkyl ammonium hydrogen sulphate Lead antimony alloy cyclic voltammetry Electrochemical impedance spectroscopy Inhibitor efficiency

بهزاد رضايي

علي اصغر انصافي

محمدتقي جعفري، محمد ژياني