Experimental observation of phenomena developing on ion-exchange systems during current-voltage curve measurement

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F19%3A43919672" target="_blank" >RIV/60461373:22340/19:43919672 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/49777513:23640/19:43955074

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0376738818319665?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0376738818319665?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.memsci.2018.11.037" target="_blank" >10.1016/j.memsci.2018.11.037</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Experimental observation of phenomena developing on ion-exchange systems during current-voltage curve measurement

Popis výsledku v původním jazyce

Ion-exchange systems represented, for example, by ion-exchange membranes or ion-exchange resin particles exhibit nonlinear current-voltage curves on which one finds three distinct regions. These regions are referred to as underlimiting, limiting and overlimiting ones. Each of these regions reflects proceeding phenomena responsible for the ion transport. It is known that all important transport processes take place on the depletion side of the ion-exchange systems. Here, we capture the situation at the interface between a cation-exchange system and an electrolyte on the depletion side as it develops during the measurement of a current-voltage curve by using fluorescent and optical observations. Our observations allow to describe qualitatively transport phenomena occurring in ion-exchange systems and to assign their onset to the particular points on the current-voltage curve. We show that current-voltage curves for the studied systems, namely a single cation-exchange particle and a heterogeneous cation-exchange membrane, have a shape typical for ion-exchange systems, i.e. we can clearly recognize underlimiting, limiting and overlimiting region. Interestingly, the overlimiting region of both systems can be divided into two parts based on the slope of the current-voltage curve in this region. We show that there is a qualitative and quantitative change in the developed electroconvection as the major mechanism governing the overlimiting current when the system transitions from the first part of the overlimiting region to the second one. This transition of electroconvection causes its mixing effect to change from local to global. © 2018 Elsevier B.V.

Název v anglickém jazyce

Experimental observation of phenomena developing on ion-exchange systems during current-voltage curve measurement

Popis výsledku anglicky

Ion-exchange systems represented, for example, by ion-exchange membranes or ion-exchange resin particles exhibit nonlinear current-voltage curves on which one finds three distinct regions. These regions are referred to as underlimiting, limiting and overlimiting ones. Each of these regions reflects proceeding phenomena responsible for the ion transport. It is known that all important transport processes take place on the depletion side of the ion-exchange systems. Here, we capture the situation at the interface between a cation-exchange system and an electrolyte on the depletion side as it develops during the measurement of a current-voltage curve by using fluorescent and optical observations. Our observations allow to describe qualitatively transport phenomena occurring in ion-exchange systems and to assign their onset to the particular points on the current-voltage curve. We show that current-voltage curves for the studied systems, namely a single cation-exchange particle and a heterogeneous cation-exchange membrane, have a shape typical for ion-exchange systems, i.e. we can clearly recognize underlimiting, limiting and overlimiting region. Interestingly, the overlimiting region of both systems can be divided into two parts based on the slope of the current-voltage curve in this region. We show that there is a qualitative and quantitative change in the developed electroconvection as the major mechanism governing the overlimiting current when the system transitions from the first part of the overlimiting region to the second one. This transition of electroconvection causes its mixing effect to change from local to global. © 2018 Elsevier B.V.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Membrane Science

ISSN

0376-7388

e-ISSN

—

Svazek periodika

572

Číslo periodika v rámci svazku

Neuvedeno

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

607-618

Kód UT WoS článku

000453402100061

EID výsledku v databázi Scopus

2-s2.0-85057449608