Measurement of Water Uptake and States in Nafion Membranes Using Humidity-Controlled Terahertz Time-Domain Spectroscopy

Ludlam, George A. H. and Gnaniah, Sam J. P. and Degl’Innocenti, Riccardo and Gupta, Gaurav and Wain, Andrew J. and Lin, Hungyen (2024) Measurement of Water Uptake and States in Nafion Membranes Using Humidity-Controlled Terahertz Time-Domain Spectroscopy. ACS Sustainable Chemistry and Engineering, 12 (20). pp. 7924-7934. ISSN 2168-0485

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Abstract

Perfluorinated sulfonic acid ionomers are well known for their unique water uptake properties and chemical/mechanical stability. Understanding their performance–stability trade-offs is key to realizing membranes with optimal properties. Terahertz time-domain spectroscopy has been demonstrated to resolve water states inside industrially relevant membranes, producing qualitatively agreeable results to conventional gravimetric analysis and prior demonstrations. Using the proposed humidity-controlled terahertz time-domain spectroscopy, here we quantify this detailed water information inside commercially available Nafion membranes at various humidities for direct comparison against literature values from dynamic vapor sorption, differential scanning calorimetry, and Fourier transform infrared spectroscopy on selected samples. Using this technique therefore opens up opportunities for rapid future parameter space investigation for membrane optimization.

Item Type:
Journal Article
Journal or Publication Title:
ACS Sustainable Chemistry and Engineering
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1500
Subjects:
?? membrane hydrationproton-exchange membranesterahertz spectroscopywater stateschemical engineering(all)chemistry(all)renewable energy, sustainability and the environmentenvironmental chemistry ??
ID Code:
220014
Deposited By:
Deposited On:
17 May 2024 09:05
Refereed?:
Yes
Published?:
Published
Last Modified:
19 Jun 2024 12:25