Measuring electro-osmotic drag coefficients in PFSA membranes without any diffusion assumption. (20th September 2019)

• Record Type: Journal Article
• Authors: Sellin, R.C.; Mozet, K.; Ménage, A.; Dillet, J.; Didierjean, S.; Maranzana, G.
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 45(2019)
• Page Start: 24905
• Page End: 24912
• Publication Date: 2019-09-20
• Subjects: PFSA membrane -- Electro-osmotic drag -- Hydrogen pump; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.07.076
• Languages: English
• ISSNs: 0360-3199

Abstract

Absrtract: An original set-up derived from the now standard hydrogen pump set-up is presented. The system enables isolation of the electro-osmosis as the lone macroscopic mass transport phenomenon, by minimizing or suppressing other external gradients, keeping the total pressure as the unique adjustment macroscopic parameter. The Electro-Osmotic Drag (EOD) coefficient was determined using 4 Nafion™ MEA (XL, 115, 117, 1110) as material, for temperature values in the 50–80 °C range, relative humidity (RH) values in the 30–90% range and current densities ranging from 1.2 up to 1000 mA cm −2 . Pure Nafion™membranes exhibit the same behaviours with EOD coefficients between 0.8 and 1 and which do not depend on the current density or RH. Nafion™ XL based MEA show a singular behaviour with an EOD coefficient sometime as low as 0.4 and which depends on the RH. Highlights: The electro-osmotic drag coefficient in PFSA membranes is measured without any diffusion assumptions. The Electro-Osmotic Drag coefficient was determined using 4 Nafion™ MEA (XL, 115, 117, 1110). Pure Nafion™ membranes exhibit the same behaviours with EOD coefficients between 0.8 and 1. Nafion™ XL based MEA show a singular behaviour with an EOD coefficient sometime as low as 0.4 and which depends on the RH.