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Membranes
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Membranes for Energy Conversion (Volume II)
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Membranes for Energy Conversion (Volume II)

A special issue of Membranes (ISSN 2077-0375). This special issue belongs to the section "Membrane Applications".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 4898

Special Issue Editor

Dr. V. María Barragán

E-Mail Website
Guest Editor
Department of Structure of Matter, Thermal Physics and Electronics, Faculty of Physics, Complutense University of Madrid, Plaza de Ciencias, 1, 28040 Madrid, Spain
Interests: non-equilibrium thermodynamics; membrane transport processes; ion-exchange membranes; energy conversion
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is the continuation of the previous one recently published in Membranes with the same title (https://www.mdpi.com/journal/membranes/special_issues/mem_energy_conversion).

Global energy consumption continues to grow, and the present energy generation is still largely dependent on fossil fuels, which will become less accessible in the not-too-distant future. In addition, the increase in the price of energy together with the environmental problems resulting from the excessive emission of greenhouse gases have led to a growing interest in the development of alternative energy sources. In addressing this challenge, membrane technology is a promising alternative for energy conversion with less environmental impact and, in this sense, the interest in it has been growing rapidly. Membranes have the opportunity to become a key element in the transition to a more energetically sustainable world.

From the energy conversion perspective, the potential application of membranes covers a wide range, including their use as electrolytes in membrane-based fuel cells, as separators in lithium batteries, in obtaining blue energy by means of reverse electrodialysis, or in thermoelectric and electrokinetic energy conversion, among others. Some membrane technologies are already applied in industries at scale, and others are still in earlier stages, but in any case, we are faced with the major challenge of making breakthroughs in membrane science and technology.

Research contributions on all the aspects involved in the use of membranes for energy conversion are welcome for this Special Issue.

Dr. V. María Barragán
Guest Editor

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

  • membranes
  • energy conversion
  • membrane technology
  • physical chemistry
  • chemical physics
  • thermodynamics
  • fuel cells
  • batteries
  • ion transport
  • thermoelectricity
  • electrochemical energy

Published Papers (3 papers)

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Research

11 pages, 2863 KiB  
Article
Proton Conducting Membranes with Molecular Self Assemblies and Ionic Channels for Efficient Proton Conduction
by Avneesh Kumar and Dong Wook Chang
Membranes 2022, 12(12), 1174; https://doi.org/10.3390/membranes12121174 - 22 Nov 2022
Viewed by 1171
Abstract
Supramolecular assemblies are vital for biological systems. This phenomenon in artificial materials is directly related to their numerous properties and their performance. Here, a simple approach to supramolecular assemblies is employed to fabricate highly efficient proton conducting molecular wires for fuel cell applications. [...] Read more.
Supramolecular assemblies are vital for biological systems. This phenomenon in artificial materials is directly related to their numerous properties and their performance. Here, a simple approach to supramolecular assemblies is employed to fabricate highly efficient proton conducting molecular wires for fuel cell applications. Small molecule-based molecular assembly leading to a discotic columnar architecture is achieved, simultaneously with proton conduction that can take place efficiently in the absence of water, which otherwise is very difficult to obtain in interconnected ionic channels. High boiling point proton facilitators are incorporated into these columns possessing central ionic channels, thereby increasing the conduction multifold. Larger and asymmetrical proton facilitators disintegrated the self-assembly, resulting in low proton conduction efficiency. The highest conductivity was found to be approaching 10−2 S/cm for the molecular wires in an anhydrous state, which is ascribed to the continuous network of hydrogen bonds in which protons can hop between with a lower energy barrier. The molecular wires with ionic channels presented here have potential as an alternative to proton conductors operating under anhydrous conditions at both low and high temperatures. Full article
(This article belongs to the Special Issue Membranes for Energy Conversion (Volume II))
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17 pages, 2184 KiB  
Article
Magnesium-Doped Sr2(Fe,Mo)O6−δ Double Perovskites with Excellent Redox Stability as Stable Electrode Materials for Symmetrical Solid Oxide Fuel Cells
by Kun Zheng, Jakub Lach, Hailei Zhao, Xiubing Huang and Kezhen Qi
Membranes 2022, 12(10), 1006; https://doi.org/10.3390/membranes12101006 - 18 Oct 2022
Cited by 4 | Viewed by 1909
Abstract
In this work, magnesium-doped Sr2Fe1.2Mg0.2Mo0.6O6−δ and Sr2Fe0.9Mg0.4Mo0.7O6−δ double perovskites with excellent redox stability have been successfully obtained. The physicochemical properties including: crystal structure properties, redox [...] Read more.
In this work, magnesium-doped Sr2Fe1.2Mg0.2Mo0.6O6−δ and Sr2Fe0.9Mg0.4Mo0.7O6−δ double perovskites with excellent redox stability have been successfully obtained. The physicochemical properties including: crystal structure properties, redox stability, thermal expansion properties in oxidizing and reducing conditions, oxygen content as a function of temperature and transport properties, as well as the chemical compatibility with typical electrolytes have been systematically investigated. The in situ oxidation of reduced samples using high-temperature XRD studies shows the crystal structure of materials stable at up to a high-temperature range. The in situ reduction and oxidation of sinters with dilatometer measurements prove the excellent redox stability of materials, with the thermal expansion coefficients measured comparable with electrolytes. The oxygen nonstoichiometry δ of compounds was determined and recorded in air and argon up to 900 °C. Sr2Fe1.2Mg0.2Mo0.6O6−δ oxide presents satisfactory values of electrical conductivity in air (56.2 S·cm−1 at 600 °C) and reducing conditions (10.3 S·cm−1 at 800 °C), relatively high coefficients D and k, and good ionic conductivity (cal. 0.005 S·cm−1 at 800 °C). The stability studies show that both compounds are compatible with Ce0.8Gd0.2O1.9 but react with the La0.8Sr0.2Ga0.8Mg0.2O3−d electrolyte. Therefore, the magnesium-doped double perovskites with excellent redox stability can be potentially qualified as electrode materials for symmetrical SOFCs and are of great interest for further investigations. Full article
(This article belongs to the Special Issue Membranes for Energy Conversion (Volume II))
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12 pages, 1852 KiB  
Article
Identifying Characteristic Frequencies in the Electrochemical Impedance of Ion-Exchange Membrane Systems
by Antonio Angel Moya
Membranes 2022, 12(10), 1003; https://doi.org/10.3390/membranes12101003 - 16 Oct 2022
Cited by 2 | Viewed by 1342
Abstract
In this study, the characteristic frequencies of the electrochemical impedance of ion-exchange membrane systems constituted by the membrane and two diffusion boundary layers adjacent to the membrane were investigated. Approximations of the impedance of the Randles equivalent electric circuit in multiple frequency ranges [...] Read more.
In this study, the characteristic frequencies of the electrochemical impedance of ion-exchange membrane systems constituted by the membrane and two diffusion boundary layers adjacent to the membrane were investigated. Approximations of the impedance of the Randles equivalent electric circuit in multiple frequency ranges were considered, and the characteristic frequencies of the zeros and poles of orders ½ and 1 were derived. The characteristic geometric frequencies, those associated with the interfacial charge transfer and the diffusive transport processes, as well as those associated with the transitions between processes, were identified by means of analytical expressions. Full article
(This article belongs to the Special Issue Membranes for Energy Conversion (Volume II))
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