Water states measurement in proton-exchange membranes using humidity-controlled terahertz time-domain spectroscopy

Ludlam, George A.H. and Gnaniah, Samuel J.P. and Degl'innocenti, Riccardo and Gupta, Gaurav and Wain, Andrew J. and Lin, Hungyen (2024) Water states measurement in proton-exchange membranes using humidity-controlled terahertz time-domain spectroscopy. In: 2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2024 :. International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz . IEEE Computer Society Press, AUS. ISBN 9798350370324

Abstract

Terahertz time-domain spectroscopy (THz-TDS) has previously been demonstrated to resolve water states inside industrially relevant proton-exchange fuel-cell membranes under ambient conditions. As these membranes will operate under various humidities, in this work we quantify water states inside commercially available Nafion membranes in-situ at various humidities for direct comparisons against literature values from differential scanning calorimetry and Fourier transform infrared spectroscopy where correlations are observed.