Electrolyte effects on the electrochemical performance of microemulsions

Peng, Jing; Xiao, Ye; Imel, Adam; Barth, Brian Andrew; Cantillo, Nelly M.; Nelms, K. McKensie; Zawodzinski, Thomas A.

doi:10.1016/j.electacta.2021.139048

Electrolyte effects on the electrochemical performance of microemulsions

Journal Article · Tue Aug 10 00:00:00 EDT 2021 · Electrochimica Acta

DOI:https://doi.org/10.1016/j.electacta.2021.139048· OSTI ID:3006938

^[1]; Xiao, Ye ^[1]; ^[2]; ^[2]; Cantillo, Nelly M. ^[2]; ^[2]; Zawodzinski, Thomas A. ^[3]

Beihang Univ., Beijing (China)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Here, we report a study of the electrochemistry of Ferrocene (Fc) in a Tween®20 (polyethylene glycol (20) sorbitan monolaurate) /1-butanol/ water/Toluene (TBWT) microemulsion system, focusing on the effects of electrolyte components. Resistance and conductivity measurements are used along with Cyclic Voltammetry (CV) to characterize the effects of supporting electrolyte, such as Bu₄NBF₄ and KNO₃, on the electrochemical performance and transport properties of Fc. With increasing Fc-containing oil phase concentration in the microemulsion, the observed peak current density fails to increase proportionately with the Fc concentration. Adding 0.05 m Bu₄NBF₄ in the oil phase significantly increases the current density, presumably by lowering the resistance of microemulsion and promoting the accessibility of Fc in the system. Moreover, increasing the aqueous phase supporting electrolyte from 0.5 m KNO₃ to 1 m KNO₃ does not exhibit an analogous effect. We discuss these results in the context of our working hypothesis for microemulsion organization and its implications for electron transfer to Fc.

View Accepted Manuscript (DOE)

Research Organization:: Case Western Reserve Univ., Cleveland, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019409

OSTI ID:: 3006938

Alternate ID(s):: OSTI ID: 1813893

Journal Information:: Electrochimica Acta, Journal Name: Electrochimica Acta Vol. 393; ISSN 0013-4686

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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