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Changes in Nafion® 117 internal structure and related properties during exposure to elevated temperature and pressure in an aqueous environment
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SYSNO ASEP 0486339 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Changes in Nafion® 117 internal structure and related properties during exposure to elevated temperature and pressure in an aqueous environment Author(s) Mališ, J. (CZ)
Paidar, M. (CZ)
Bystroň, T. (CZ)
Brožová, Libuše (UMCH-V) RID, ORCID
Zhigunov, Alexander (UMCH-V) RID, ORCID
Bouzek, K. (CZ)Source Title Electrochimica acta. - : Elsevier - ISSN 0013-4686
Roč. 262, 1 February (2018), s. 264-275Number of pages 12 s. Language eng - English Country GB - United Kingdom Keywords Nafion ; elevated temperature ; excessive swelling Subject RIV CG - Electrochemistry OECD category Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis) Institutional support UMCH-V - RVO:61389013 UT WOS 000424637300029 EID SCOPUS 85040237036 DOI 10.1016/j.electacta.2018.01.011 Annotation In this study the behaviour and structure of a Nafion® 117 membrane exposed to liquid water at temperatures and pressures of up to 150 °C and 700 kPa, respectively, were investigated. The results clearly showed that, as the temperature of the environment approaches or exceeds the glass transition temperature of the membrane, it undergoes extensive swelling. This is connected with several changes in the membrane structure which have a predominantly detrimental influence on the functional properties of the membrane, such as ionic conductivity and ionic exchange capacity. The extent and rate of the changes increase with both rising temperature and pressure. While the changes at 150 °C and 700 kPa take place in the order of tens of minutes, at 110 °C and 500 kPa several hundreds of hours are required. The changes are enabled by amorphisation of pseudo-crystalline domains which are responsible for keeping the membrane structure intact. The changes in the internal structure were followed using small-angle X-ray scattering and visualised by current-sensing atomic force microscopy. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2019
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