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May 31, 2022 to June 3, 2022
Arabella Brauneck Hotel
Europe/Berlin timezone

Structure of Nafion membranes in humidity

Jun 3, 2022, 10:50 AM
Arabella Brauneck Hotel

Arabella Brauneck Hotel

Münchner Str. 25 83661 Lenggries
Talk Main Friday Morning


Dr Henrich Frielinghaus (JCNS)


Nafion membranes are frequently used as membranes in fuel cells and electrolyzers due to their chemical resistivity. In this study, we used Nafion membranes before and after the application. We investigated the structure of Nafion membranes in different humidity conditions using small angle neutron scattering (SANS) and prompt gamma activation analysis (PGAA). The SANS measurements reveal the swelling of the pores with water that base on the analysis of structural correlation peaks. Furthermore, the bare water content is also characterized in terms of the incoherent background. Using hydrogen polarization by spin pumping, a full contrast variation series is measured by SANS. Here, the finite pore size is clearly measured, and by the time dependence of the signals upon pumping, the thickness of the water/polymer interphases is given. PGAA reveals an independent cross check of the water uptake.

Primary authors

Earl Babcock Dr Henrich Frielinghaus (JCNS) Marie-Sousai APPAVOU (Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH) Noemi Szekely (Jülich Centre for Neutron Science JCNS) Olaf Holderer Prof. Satoshi Koizumi (Ibaraki University) Dr Yohei Noda (Ibaraki Univeristy)

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