Origin of chronoamperometric responses associated with impacts of single electrolyte droplets at a polarized liquid/liquid interface

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F20%3A00531040" target="_blank" >RIV/61388955:_____/20:00531040 - isvavai.cz</a>

Result on the web

<a href="http://hdl.handle.net/11104/0309797" target="_blank" >http://hdl.handle.net/11104/0309797</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.electacta.2020.136653" target="_blank" >10.1016/j.electacta.2020.136653</a>

Result language

angličtina

Original language name

Origin of chronoamperometric responses associated with impacts of single electrolyte droplets at a polarized liquid/liquid interface

Original language description

Chronoamperometric measurements at a constant potential are used to study the single impacts of the water-in-DCE emulsion droplets containing an electrolyte (tetrapropylammonium chloride, TPrACl) at a polarized water(W)/1,2-dichloroethane (DCE) interface. The impacts give rise to the spike-like current transients, which are characterized by the initial current step (time constant less than 2 ms) followed by a slower exponential current decay with a time constant in tens of milliseconds. It is shown that the theoretical treatment of the current spikes can be based on a modification of the bulk electrolysis model including (1) the droplet collision at the W/DCE interface, (2) a partial coalescence (fusion) of the droplet with the impacted interface, (3) a reorganization of the electric double layer leading to the propagation of the interfacial potential difference from the impacted interface to the surface of the droplet, and (4) stripping (bulk electrolysis) of TPrA+ from the droplet to the DCE phase accompanied by the chloride depletion into the bulk water phase. On assuming that the stripping of TPrA+ is the rate-determining step of the impact event, the theoretical relationships for the current transient are derived, which are confirmed by the experimental data. An analysis of the current transients yields the charge corresponding to the ionic content of the droplets, which is used to evaluate the droplet diameter. Droplet size distribution with the droplet diameter of around 8 μm is verified by an analysis of the microscopic images of the W-in-DCE emulsion, and in part also by the dynamic laser scattering measurements. It is shown that the frequency of the droplet collisions with the W/DCE interface (1–10 Hz) is controlled by migration of the negatively charged droplets towards the interface.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

<a href="/en/project/GA20-01589S" target="_blank" >GA20-01589S: New strategies for improving sensing properties of novel electrode materials via their surface pretreatment or modification</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Electrochimica acta

ISSN

0013-4686

e-ISSN

—

Volume of the periodical

354

Issue of the periodical within the volume

SEP 2020

Country of publishing house

GB - UNITED KINGDOM

Number of pages

8

Pages from-to

136653

UT code for WoS article

000569140400006

EID of the result in the Scopus database

2-s2.0-85086891141