Towards understanding of the behavior of heterogeneous ion-exchange membranes
The result's identifiers
Result code in 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>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Towards understanding of the behavior of heterogeneous ion-exchange membranes
Original language description
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.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
CI - Industrial chemistry and chemical engineering
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GJ15-10907Y" target="_blank" >GJ15-10907Y: The effect of surface heterogeneities of heterogeneous ion-exchange membranes on their behavior.</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
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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Number of pages
10
Pages from-to
720-729
Publisher name
Slovak Society of Chemical Engineering
Place of publication
Bratislava
Event location
Tatranské Matliare
Event date
May 23, 2016
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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