Towards understanding of the behavior of heterogeneous ion-exchange membranes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F16%3A43902369" target="_blank" >RIV/60461373:22340/16:43902369 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Towards understanding of the behavior of heterogeneous ion-exchange membranes

Popis výsledku v původním jazyce

It has been known for over 50 years that ion-exchange membranes display interesting nonlinear current-voltage characteristics. One can find three regions on such current-voltage curves that are referred to as underlimiting, limiting and overlimiting. While underlimiting and limiting regions can be well explained by concentration polarization, overlimiting region is still a subject of often tumultuous scientific debates. The concentration polarization predicts (i) formation of depletion and concentration electrolyte layers adjacent to the membrane and (ii) true saturation of the electrical current that cannot exceed its limiting value reached for a critical voltage. In reality, overlimiting current higher than the value of the limiting current is observed. Many theories have described to explain this observation and the general consensus in the scientific community agrees with the fact that a few mechanisms may play a significant role. To shed more light on the origin of the overlimiting current observed on heterogeneous ion-exchange membranes we developed a milifluidic system, that allow several important measurements: (i) structural analysis of membrane samples prior to any measurement, (ii) electrochemical characterization of those membrane samples, (iii) optical and fluorescent observation of processes occurring around the ion-exchange membranes. By combining different experimental data we aim to relate and describe mutual dependencies among membrane structure, its electrochemical properties and observed behavior in the overlimiting current. In this paper, we will focus on a systematic study of heterogeneous ion-exchange membranes kindly provided by Membrain a.s. We will discuss observed phenomena in the context of membrane properties and structure.

Název v anglickém jazyce

Towards understanding of the behavior of heterogeneous ion-exchange membranes

Popis výsledku anglicky

It has been known for over 50 years that ion-exchange membranes display interesting nonlinear current-voltage characteristics. One can find three regions on such current-voltage curves that are referred to as underlimiting, limiting and overlimiting. While underlimiting and limiting regions can be well explained by concentration polarization, overlimiting region is still a subject of often tumultuous scientific debates. The concentration polarization predicts (i) formation of depletion and concentration electrolyte layers adjacent to the membrane and (ii) true saturation of the electrical current that cannot exceed its limiting value reached for a critical voltage. In reality, overlimiting current higher than the value of the limiting current is observed. Many theories have described to explain this observation and the general consensus in the scientific community agrees with the fact that a few mechanisms may play a significant role. To shed more light on the origin of the overlimiting current observed on heterogeneous ion-exchange membranes we developed a milifluidic system, that allow several important measurements: (i) structural analysis of membrane samples prior to any measurement, (ii) electrochemical characterization of those membrane samples, (iii) optical and fluorescent observation of processes occurring around the ion-exchange membranes. By combining different experimental data we aim to relate and describe mutual dependencies among membrane structure, its electrochemical properties and observed behavior in the overlimiting current. In this paper, we will focus on a systematic study of heterogeneous ion-exchange membranes kindly provided by Membrain a.s. We will discuss observed phenomena in the context of membrane properties and structure.

Druh

D - Stať ve sborníku

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

<a href="/cs/project/GJ15-10907Y" target="_blank" >GJ15-10907Y: Vliv povrchových heterogenit heterogenních iontově-výměnných membrán na jejich chování.</a><br>

Návaznosti

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

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings 43rd International Conference of the Slovak Society of Chemical Engineering

ISBN

978-80-89597-35-2

ISSN

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e-ISSN

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Počet stran výsledku

10

Strana od-do

720-729

Název nakladatele

Slovak Society of Chemical Engineering

Místo vydání

Bratislava

Místo konání akce

Tatranské Matliare

Datum konání akce

23. 5. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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