Capacitance of the interface between two immiscible electrolyte solutions - A controversial issue

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F22%3A00549372" target="_blank" >RIV/61388955:_____/22:00549372 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0325384" target="_blank" >http://hdl.handle.net/11104/0325384</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.electacta.2021.139720" target="_blank" >10.1016/j.electacta.2021.139720</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Capacitance of the interface between two immiscible electrolyte solutions - A controversial issue

Popis výsledku v původním jazyce

Electrochemical impedance spectroscopy is used to evaluate the capacitance of the polarizable interface between a solution of LiCl + HCl in water and a solution of bis(triphenylphospho-ranylidene)ammonium tetrakis(pentafluorophenyl)borate in 1,2-dichloroethane (DCE).nnA significant effect of both the interfacial potential difference and the electrolyte concentration on the capacitance is observed using two different experimental arrangements. The former effect is supported by an independent evaluation of the capacitance as the second derivative of the interfacial tension vs. the potential difference plot. It is shown that the experimental data can be reproduced relatively well by means of the Gouy-Chapman theory and the modified Verwey-Niessen model of the electric double layer consisting of two back-to-back space charge regions separated by an inner layer of the solvent molecules. However, the effect of the electrolyte concentration points to an easy penetration of ions into the inner layer leading to its negative contribution to the inverse capacitance. These conclusions are at variance with those made recently on the basis of the impedance measurements at the micro-hole supported water/DCE interface. A tentative explanation is proposed, which refers to the possible absence of the direct control of the active area of the liquid/liquid interface shape and position in the micro-hole over a broad range of the potential differences.

Název v anglickém jazyce

Capacitance of the interface between two immiscible electrolyte solutions - A controversial issue

Popis výsledku anglicky

Electrochemical impedance spectroscopy is used to evaluate the capacitance of the polarizable interface between a solution of LiCl + HCl in water and a solution of bis(triphenylphospho-ranylidene)ammonium tetrakis(pentafluorophenyl)borate in 1,2-dichloroethane (DCE).nnA significant effect of both the interfacial potential difference and the electrolyte concentration on the capacitance is observed using two different experimental arrangements. The former effect is supported by an independent evaluation of the capacitance as the second derivative of the interfacial tension vs. the potential difference plot. It is shown that the experimental data can be reproduced relatively well by means of the Gouy-Chapman theory and the modified Verwey-Niessen model of the electric double layer consisting of two back-to-back space charge regions separated by an inner layer of the solvent molecules. However, the effect of the electrolyte concentration points to an easy penetration of ions into the inner layer leading to its negative contribution to the inverse capacitance. These conclusions are at variance with those made recently on the basis of the impedance measurements at the micro-hole supported water/DCE interface. A tentative explanation is proposed, which refers to the possible absence of the direct control of the active area of the liquid/liquid interface shape and position in the micro-hole over a broad range of the potential differences.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/GA20-01589S" target="_blank" >GA20-01589S: Nové strategie pro zlepšení senzorových vlastností nových elektrodových materiálů prostřednictvím jejich předúpravy či modifikace povrchu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Electrochimica acta

ISSN

0013-4686

e-ISSN

1873-3859

Svazek periodika

403

Číslo periodika v rámci svazku

JAN 2022

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

139720

Kód UT WoS článku

000776113700010

EID výsledku v databázi Scopus

2-s2.0-85121256921