122nd General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Grand Ballroom
Time 10월 19일 (금요일) 11:00~12:30
Code ELEC.P-495
Subject Semi-quantitative determination of ion transfers at an interface between water and quaternary ammonium polybromide droplets through stochastic electrochemical analysis
Authors Semi Lee, Kyungmi Kim1, Jinho Chang*
Department of Chemistry, Hanyang University, Korea
1Department of Chemistry, Sungshin University, Korea
Abstract we present stochastic electrochemical analyses for the semi-quantitative determination of ion transfers (ITs) at an interface between water and electrochemically generated quaternary ammonium polybromide (QBr2n+1) droplets (water│QBr2n+1) in QBr aqueous solutions containing different acids (HAs). The concentration of Br− in QBr2n+1, CBr-(QBr2n+1) is linearly proportional to CA-(aq) with the proportionality constant, which was estimated from the difference between the two partition coefficients of H+ and A− from water toward QBr2n+1, KH+-KA-, and the ratio of the mean activity coefficient of the aqueous over that of the QBr2n+1 phase, γ±,aq/γ±,QBr2n+1. CBr-(QBr2n+1) also shows the linear function of CQ+(aq) with (γ±,aq⁄γ±,QBr2n+1)KQ+ as its proportionality constant. The stochastic chronoamperometric analyses of QBr2n+1 droplets during their particle-impacts on Pt UME in acidic solutions with MEPBr or EPyBr as model QBrs can provide indirect information about CBr-(QBr2n+1), and we estimated the relative order. Also, we found that Br−-IT at water|QBr2n+1 is effectively limited by A−-IT in the acidic solutions, and Cl− is most significantly transferred to QBr2n+1, leading to the complete inhibition of Br−-IT into QBr2n+1.
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