119th General Meeting of the KCS

Type Symposium
Area Recent Trends in Electrochemistry I
Room No. 406호
Time THU 13:30-:
Code ELEC1-1
Subject Electrochemical Generation of Single Emulsion Droplets and in-situ Observation of Collisions on an Ultramicroelectrode
Authors 장진호
성신여자대학교 화학과, Korea
Abstract The Br−/Br2 redox couple in aqueous solution has been often employed for redox flow batteries along with N-methyl-N-ethyl pyrrolidinium bromide (MEPBr) as a bromine-complexing agent, which forms insoluble organic droplets of MEPBr3 complexes during electro-oxidation of Br−. We, for the first time, report the electro- chemistry of Br− electro-oxidation in electrochemically generated single droplets of MEPBr3 using the current transient method on an ultramicroelectrode (UME). Current spikes were observed in the chronoamperogram of the aqueous solutions containing more than 32 mM of MEPBr, and they correspond to electro-oxidation of Br− in MEPBr3. The voltammetric behavior of Br− electro-oxidation in single droplets of MEPBr3 was similar to that in the aqueous phase. The maximum concentration of Br− in the MEPBr3 droplets was estimated to be ∼7.5 M by fitting the observed current transient curves to the simulation using a bulk electrolysis model. Our study reveals that MEPBr3 also plays a vital role as an electrochemical reaction medium for Br− electro-oxidation in the Br−/Br2 redox system.
E-mail jinho_echem@sungshin.ac.kr