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Development and Application of Solid Oxide Electrolytes
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Development and Application of Solid Oxide Electrolytes

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: closed (20 April 2023) | Viewed by 4263

Special Issue Editor

Dr. Irina Animitsa

E-Mail Website
Guest Editor
Institute of Natural Sciences and Mathematics, Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia
Interests: materials science; transport phenomena in solids; solid-state electrochemistry; solid electrolytes
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Oxygen ionic conductors find important applications in solid-state electrochemical devices, including sensors, solid oxide fuel cells, high-temperature electrolyzers, and oxygen separation membranes. All of these devices offer the potential of enormous commercial and ecological benefits provided that suitable high-performance materials can be developed.

For satisfactory performance, the electrolyte must meet some requirements that limit the choice of the material. These include high oxide-ion conductivity at the operating temperature, negligible electronic conduction, high density of materials, thermodynamic stability over a wide range of temperature and oxygen partial pressure, TEC compatible with that of the electrodes and other cell materials, suitable mechanical properties, negligible chemical interaction with electrode materials, the ability to be elaborated as thin layers, low cost of starting materials and fabrication.

Three electrolytes, yttria-stabilized zirconia, rare-earth-doped ceria, and lanthanum strontium gallium magnesium oxide are the most studied for their high conductivity. However, each of these materials also has disadvantages, so a strong motivation remains to discover electrolyte materials with higher conductivity at the lower working temperatures. 

Not only fluorite- and perovskite-related phases, but other classes of oxygen-ionic conductors have also been found, including brownmillerites, apatites, pyrochlores, BIMEVOXes, and LAMOXes. Recently, new oxygen-ion conductors with a Ruddlesden–Popper structure and hexagonal perovskites have been described.

In this Special Issue, we intend to present studies of the major groups of oxygen ionic conductors, placing special emphasis on their ion transport properties, methods of synthesis and obtaining films, as well as various aspects of applications of oxygen ionic conductors. It is our pleasure to invite you to contribute your research article, communication, or review to this Special Issue.

Dr. Irina Animitsa
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. Materials is an international peer-reviewed open access semimonthly 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 2600 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

  • oxygen ion conductivity
  • diffusion
  • transport properties
  • ceramics
  • thin films
  • solid oxide fuel cells
  • sensors

Published Papers (3 papers)

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Research

13 pages, 3398 KiB  
Article
Advanced Proton-Conducting Ceramics Based on Layered Perovskite BaLaInO4 for Energy Conversion Technologies and Devices
by Nataliia Tarasova and Anzhelika Bedarkova
Materials 2022, 15(19), 6841; https://doi.org/10.3390/ma15196841 - 1 Oct 2022
Cited by 7 | Viewed by 1381
Abstract
Production of high efficiency renewable energy source for sustainable global development is an important challenge for humans. Hydrogen energy systems are one of the key elements for the development of sustainable energy future. These systems are eco-friendly and include devices such as protonic [...] Read more.
Production of high efficiency renewable energy source for sustainable global development is an important challenge for humans. Hydrogen energy systems are one of the key elements for the development of sustainable energy future. These systems are eco-friendly and include devices such as protonic ceramic fuel cells, which require advanced proton-conducting materials. In this study, we focused on new ceramics with significantly improved target properties for hydrogen energy purposes. Neodymium-doped phase based on layered perovskite BaLaInO4 was obtained for the first time. The ability for water intercalation and proton transport was proved. It was shown that the composition BaLa0.9Nd0.1InO4 is the predominant proton conductor below 400 °C under wet air. Moreover, isovalent doping of layered perovskites AA′BO4 is the promising method for improving transport properties and obtaining novel advanced proton-conducting ceramic materials. Full article
(This article belongs to the Special Issue Development and Application of Solid Oxide Electrolytes)
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10 pages, 3306 KiB  
Communication
Modernized Synthesis Technique of Pr2NiO4+δ-Based Complex Oxides Using Low-Temperature Salt Melts
by Artem P. Tarutin, Stanislav A. Baratov and Dmitry A. Medvedev
Materials 2022, 15(17), 6148; https://doi.org/10.3390/ma15176148 - 5 Sep 2022
Cited by 1 | Viewed by 1549
Abstract
Phases based on layered lanthanide nickelates are considered as promising electrode materials for various electrochemical devices, including solid oxide fuel cells and electrolysis cells. While such compounds may be prepared using either solid state or solution-assisted syntheses, each of these approaches entails certain [...] Read more.
Phases based on layered lanthanide nickelates are considered as promising electrode materials for various electrochemical devices, including solid oxide fuel cells and electrolysis cells. While such compounds may be prepared using either solid state or solution-assisted syntheses, each of these approaches entails certain problems. In the present work, we propose a novel approach for the simple and straightforward preparation of Pr2NiO4+δ-based materials. This approach involves co-melting of initial nitrate components, followed by high-temperature decomposition of the obtained mixture. The developed synthesis method exhibits a number of advantages over conventional techniques, enabling highly dispersed and single-phase powders to be obtained at a reduced synthesis temperature of 1050 °C. Therefore, the results of this work open new possibilities for the cost-effective preparation of Ruddlesden–Popper oxide phases. Full article
(This article belongs to the Special Issue Development and Application of Solid Oxide Electrolytes)
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Graphical abstract

18 pages, 4991 KiB  
Article
Proton and Oxygen-Ion Conductivities of Hexagonal Perovskite Ba5In2Al2ZrO13
by Roman Andreev, Daniil Korona, Irina Anokhina and Irina Animitsa
Materials 2022, 15(11), 3944; https://doi.org/10.3390/ma15113944 - 1 Jun 2022
Cited by 9 | Viewed by 1934
Abstract
The hexagonal perovskite Ba5In2Al2ZrO13 and In3+-doped phase Ba5In2.1Al2Zr0.9O12.95 were prepared by the solid-state synthesis method. The introduction of indium in the Zr-sublattice was accompanied by [...] Read more.
The hexagonal perovskite Ba5In2Al2ZrO13 and In3+-doped phase Ba5In2.1Al2Zr0.9O12.95 were prepared by the solid-state synthesis method. The introduction of indium in the Zr-sublattice was accompanied by an increase in the unit cell parameters: a = 5.967 Å, c = 24.006 Å vs. a = 5.970 Å, c = 24.011 Å for doped phase (space group of P63/mmc). Both phases were capable of incorporating water from the gas phase. The ability of water incorporation was due to the presence of oxygen deficient blocks in the structure, and due to the introduction of oxygen vacancies during doping. According to thermogravimetric (TG) measurements the compositions of the hydrated samples corresponded to Ba5In2Al2ZrO12.7(OH)0.6 and Ba5In2.1Al2Zr0.9O12.54(OH)0.82. The presence of different types of OH−-groups in the structure, which participate in different hydrogen bonds, was confirmed by infrared (IR) investigations. The measurements of bulk conductivity by the impedance spectroscopy method showed that In3+-doping led to an increase in conductivity by 0.5 order of magnitude in wet air (pH2O = 1.92·10−2 atm); in this case, the activation energies decreased from 0.27 to 0.19 eV. The conductivity−pO2 measurements showed that both the phases were dominant proton conductors at T < 500 °C in wet conditions. The composition Ba5In2.1Al2Zr0.9O12.95 exhibited a proton conductivity ~10−4 S·cm−1 at 500 °C. The analysis of partial (O2−, H+, h•) conductivities of the investigated phases has been carried out. Both phases in dry air (pH2O = 3.5·10−5 atm) showed a mixed (oxygen-ion and hole) type of conductivity. The obtained results indicated that the investigated phases of Ba5In2Al2ZrO13 and Ba5In2.1Al2Zr0.9O12.95 might be promising proton-conducting oxides in the future applications in electrochemical devices, such as solid oxide fuel cells. Further modification of the composition and search for the optimal dopant concentrations can improve the H+-conductivity. Full article
(This article belongs to the Special Issue Development and Application of Solid Oxide Electrolytes)
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