Title: Composite membranes for alkaline electrolysis based on polysulfone and mineral fillers
Authors : Burnat, Dariusz Artur
Schlupp, Meike
Wichser, Adrian
Lothenbach, Barbara
Gorbar, Michal
Züttel, Andreas
Vogt, Ulrich F.
Published in : Journal of Power Sources
Volume(Issue) : 291
Pages : 163
Pages to: 172
Publisher / Ed. Institution : Elsevier
Issue Date: 2015
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subject (DDC) : 620: Engineering
Abstract: Mineral-based membranes for high temperature alkaline electrolysis were developed by a phase inversion process with polysulfone as binder. The long-term stability of new mineral fillers: wollastonite, forsterite and barite was assessed by 8000 h-long leaching experiments (5.5 M KOH, 85 °C) combined with thermodynamic modelling. Barite has released only 6.22 10–4 M of Ba ions into the electrolyte and was selected as promising filler material, due to its excellent stability. Barite-based membranes, prepared by the phase inversion process, were further studied. The resistivity of these membranes in 5.5 M KOH was investigated as a function of membrane thickness and total porosity, hydrodynamic porosity as well as gas purities determined by conducting electrolysis at ambient conditions. It was found that a dense top layer resulting from the phase inversion process, shows resistivity values up to 451.0 ± 22 Ω cm, which is two orders of magnitude higher than a porous bulk membrane microstructure (3.89 Ω cm). Developed membranes provided hydrogen purity of 99.83 at 200 mA cm−2, which is comparable to previously used chrysotile membranes and higher than commercial state-of-the-art Zirfon 500utp membrane. These cost-effective polysulfone – barite membranes are promising candidates as asbestos replacement for commercial applications.
Departement: School of Engineering
Organisational Unit: Institute of Materials and Process Engineering (IMPE)
Publication type: Article in scientific Journal
DOI : 10.1016/j.jpowsour.2015.04.066
ISSN: 0378-7753
URI: https://digitalcollection.zhaw.ch/handle/11475/15272
Appears in Collections:Publikationen School of Engineering

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