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Membranes
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Membranes for Fuel Cells
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Membranes for Fuel Cells

A special issue of Membranes (ISSN 2077-0375).

Deadline for manuscript submissions: closed (31 May 2020) | Viewed by 7902

Special Issue Editors

Dr. Cecilia Solís

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Guest Editor
German Engineering Materials Science Centre (GEMS) at Heinz Maier-Leibnitz Zentrum (MLZ), Helmholtz-Zentrum Geesthacht GmbH, Lichtenbergstr. 1, 85748 Garching bei München, Germany
Interests: solid state ionics; membranes; electroceramics; solid oxide fuel cells; structure characterization
Dr. María Balaguer

E-Mail Website
Guest Editor
Instituto de Tecnología Química (Universitat Politècnica de València - Consejo Superior de Investigaciones Científicas), Valencia, Spain
Interests: solid oxide fuel cells; gas separation membranes; solid state electrochemistry

Special Issue Information

Dear Colleagues,

Electrolytes are very important components in fuel cells, as they are responsible for ion selection and transport to react in the electrode.

Fuel cells based on polymer electrolyte membranes (PEMs) play an important role in applications, such as power sources for portable electronics, distributed power generation, and electric vehicles. A good PEM must present high proton conductivity, excellent mechanical strength, mechanical, chemical and electrochemical stability, low fuel or oxidant crossover, and be manageable for fabrication in membrane electrode assemblies.

Solid oxide fuel cells based on oxygen ion conductors (SOFC) and protonic conduction electrolytes (PCFC) are promising candidates for green energy production as they present high efficiency, long-term stability and fuel flexibility. Membranes based on oxygen-electron conductors have been studied the last few decades for oxygen extraction from air, as well as for direct partial oxidation of natural gas. Similarly, membranes based on mixed proton–electron conducting oxides have been widely studied in recent years for application as hydrogen separation membranes and for different catalytic membrane reactors applications. The materials and composites with the highest mixed conductivity values, at high temperatures (500–1000 °C), and stable in operation conditions (high temperature and different atmospheres), are also promising candidates as electrodes in SOFC or PCFC.

This Special Issue, “Membranes for Fuel Cells”, will be a perfect forum to bring together the latest results obtained by key laboratories focused on membranes and membrane materials with applications in fuel cell research and development.

Dr. Cecilia Solís
Dr. María Balaguer
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Membranes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • fuel cell
  • PEM
  • SOFC
  • oxygen transport membrane
  • hydrogen membrane
  • composite membrane

Published Papers (2 papers)

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Research

16 pages, 7661 KiB  
Article
In Situ Raman Characterization of SOFC Materials in Operational Conditions: A Doped Ceria Study
by Cecilia Solís, María Balaguer and José M. Serra
Membranes 2020, 10(7), 148; https://doi.org/10.3390/membranes10070148 - 10 Jul 2020
Cited by 5 | Viewed by 3546
Abstract
The particular operational conditions of electrochemical cells make the simultaneous characterization of both structural and transport properties challenging. The rapidity and flexibility of the acquisition of Raman spectra places this technique as a good candidate to measure operating properties and changes. Raman spectroscopy [...] Read more.
The particular operational conditions of electrochemical cells make the simultaneous characterization of both structural and transport properties challenging. The rapidity and flexibility of the acquisition of Raman spectra places this technique as a good candidate to measure operating properties and changes. Raman spectroscopy has been applied to well-known lanthanide ceria materials and the structural dependence on the dopant has been extracted. The evolution of Pr-doped ceria with temperature has been recorded by means of a commercial cell showing a clear increment in oxygen vacancies concentration. To elucidate the changes undergone by the electrolyte or membrane material in cell operation, the detailed construction of a homemade Raman cell is reported. The cell can be electrified, sealed and different gases can be fed into the cell chambers, so that the material behavior in the reaction surface and species evolved can be tracked. The results show that the Raman technique is a feasible and rather simple experimental option for operating characterization of solid-state electrochemical cell materials, although the treatment of the extracted data is not straightforward. Full article
(This article belongs to the Special Issue Membranes for Fuel Cells)
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11 pages, 3351 KiB  
Article
Protonic Conduction of Partially-Substituted CsH2PO4 and the Applicability in Electrochemical Devices
by Laura Navarrete, Andreu Andrio, Sonia Escolástico, Sergio Moya, Vicente Compañ and José M. Serra
Membranes 2019, 9(4), 49; https://doi.org/10.3390/membranes9040049 - 09 Apr 2019
Cited by 14 | Viewed by 3733
Abstract
CsH2PO4 is a proton conductor pertaining to the acid salts group and shows a phase transition from monoclinic to cubic phase at 232 ± 2 °C under high-steam atmospheres (>30%). This cubic phase gives rise to the so-called superprotonic conductivity. [...] Read more.
CsH2PO4 is a proton conductor pertaining to the acid salts group and shows a phase transition from monoclinic to cubic phase at 232 ± 2 °C under high-steam atmospheres (>30%). This cubic phase gives rise to the so-called superprotonic conductivity. In this work, the influence of the partial substitution of Cs by Ba and Rb, as well as the partial substitution of P by W, Mo, and S in CsH2PO4 on the phase transition temperature and electrochemical properties is studied. Among the tested materials, the partial substitution by Rb led to the highest conductivity at high temperature. Furthermore, Ba and S-substituted salts exhibited the highest conductivity at low temperatures. CsH2PO4 was used as electrolyte in a fully-assembled fuel cell demonstrating the applicability of the material at high pressures and the possibility to use other materials (Cu and ZnO) instead of Pt as electrode electrocatalyst. Finally, an electrolyzer cell composed of CsH2PO4 as electrolyte, Cu and ZnO as cathode and Pt and Ag as anode was evaluated, obtaining a stable production of H2 at 250 °C. Full article
(This article belongs to the Special Issue Membranes for Fuel Cells)
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