The determination of effective diffusion coefficient from the electrochemical impedance spectra of composite poly (vinyl alcohol) membranes
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F19%3A43956216" target="_blank" >RIV/49777513:23640/19:43956216 - isvavai.cz</a>
Výsledek na webu
<a href="http://hdl.handle.net/11025/35978" target="_blank" >http://hdl.handle.net/11025/35978</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/ep.13195" target="_blank" >10.1002/ep.13195</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
The determination of effective diffusion coefficient from the electrochemical impedance spectra of composite poly (vinyl alcohol) membranes
Popis výsledku v původním jazyce
This study presents the effect of swelling on effective diffusion coefficient of the composite poly(vinyl alcohol) (PVA) membranes through electrochemical impedance spectroscopy. The PVA based membranes were cross‐linked by sulfosuccinic acid (SSA) or tetraethylorthosilicate (TEOS) to improve the ionic conductivity and suppress the swelling. The impedance spectra of the synthesized membranes were recorded and then fitted using Randles circuit. The values of the Warburg element were analyzed and the effective diffusion coefficient was calculated for membranes in dry or wet state. Obtained values were compared with those of the Nafion NR 212 and pure PVA. A significant dependency of effective diffusion coefficient on dimension change caused by swelling was measured. In case of SSA cross‐linking, an improvement of ionic conductivity by chemical modification was observed. However, the highly hydrophilic behavior of PVA SSA samples is limiting further utilization of membrane in applications such as methanol fuel cells. To improve the stability of membrane in the wet environment, the composite PVA SSA TEOS membrane was prepared.
Název v anglickém jazyce
The determination of effective diffusion coefficient from the electrochemical impedance spectra of composite poly (vinyl alcohol) membranes
Popis výsledku anglicky
This study presents the effect of swelling on effective diffusion coefficient of the composite poly(vinyl alcohol) (PVA) membranes through electrochemical impedance spectroscopy. The PVA based membranes were cross‐linked by sulfosuccinic acid (SSA) or tetraethylorthosilicate (TEOS) to improve the ionic conductivity and suppress the swelling. The impedance spectra of the synthesized membranes were recorded and then fitted using Randles circuit. The values of the Warburg element were analyzed and the effective diffusion coefficient was calculated for membranes in dry or wet state. Obtained values were compared with those of the Nafion NR 212 and pure PVA. A significant dependency of effective diffusion coefficient on dimension change caused by swelling was measured. In case of SSA cross‐linking, an improvement of ionic conductivity by chemical modification was observed. However, the highly hydrophilic behavior of PVA SSA samples is limiting further utilization of membrane in applications such as methanol fuel cells. To improve the stability of membrane in the wet environment, the composite PVA SSA TEOS membrane was prepared.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10403 - Physical chemistry
Návaznosti výsledku
Projekt
<a href="/cs/project/LO1402" target="_blank" >LO1402: CENTEM+</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Environmental Progress and Sustainable Energy
ISSN
1944-7442
e-ISSN
—
Svazek periodika
38
Číslo periodika v rámci svazku
5
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
6
Strana od-do
"NESTRÁNKOVÁNO"
Kód UT WoS článku
000486024400054
EID výsledku v databázi Scopus
2-s2.0-85062367993