Gas Diffusion Electrodes and Membrane Electrode Assemblies Based on a Sulfonated Polysulfone for High-Temperature PEMFC
2006 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 153, no 11, A2077-A2084 p.Article in journal (Refereed) Published
Membrane electrode assemblies MEAs with a sulfonated polysulfone sPSU as the proton-conducting phase were fuel cellevaluated at varying temperatures in over-humidified conditions. The sPSU was prepared by a direct polycondensation involvinga commercially available sulfonated naphthalene diol monomer. The gas diffusion electrodes GDEs and MEAs were successfullyfabricated and a thorough morphological study was subsequently carried out on GDEs with varying sPSU contents and inksolvents. The scanning electron microscopy and porosimetry studies revealed highly porous GDE morphologies at sPSU contentsbelow 20 wt %. Double-layer capacitance measurements showed an almost fully sPSU-wetted electronic phase when the sPSUcontent was 10 wt %. The MEAs were prepared by applying the GDEs directly onto sPSU membranes. MEAs with a total Ptloading of 0.2 mg/cm2 were successfully fuel cell operated at 120°C. The MEAs showed mass-transport limitations in the rangeof 600–800 mA/cm2, most probably caused by abundant water due to the overhumidified measuring conditions. The low resistanceof the MEAs indicated a well-integrated structure between the GDEs and the membrane.
Place, publisher, year, edition, pages
2006. Vol. 153, no 11, A2077-A2084 p.
Gas diffusion electrodes (GDE), Membrane electrode assemblies (MEA), Sulfonated polysulfone (sPSU), Diffusion, High temperature effects, Membranes, Monomers, Morphology, Polysulfones
IdentifiersURN: urn:nbn:se:kth:diva-9178DOI: 10.1149/1.2335979ISI: 000241057000011ScopusID: 2-s2.0-33749612550OAI: oai:DiVA.org:kth-9178DiVA: diva2:25593
QC 201009222008-10-132008-09-302010-09-22Bibliographically approved