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High-Temperature Electrochemistry of Solid Oxide Materials and Systems
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High-Temperature Electrochemistry of Solid Oxide Materials and Systems

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "D1: Advanced Energy Materials".

Deadline for manuscript submissions: closed (31 December 2019) | Viewed by 19880

Special Issue Editors

Prof. Dr. Maxim Ananyev

E-Mail Website
Guest Editor
Laboratory of Solid Oxide Fuel Cells, Institute of High Temperature Electrochemistry, Yekaterinburg, Russia
Interests: physical chemistry and electrochemistry of solid oxides; electrochemical devices for conversion and storage of energy; solid oxide fuel cells; protonic ceramic fuel cells; electrode kinetics; catalysis; isotopic exchange; diffusion in solid oxides; surface exchange kinetics; defect formation in oxide materials
Dr. Dmitry Medvedev

E-Mail Website
Guest Editor
Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, 620066 Ekaterinburg, Russia
Interests: electrochemistry; energy conversion technology; hydrogen production; electrochemical analysis; solid state chemistry and electrochemistry; solid oxide fuel cells (SOFCs); solid oxide electrolysis cells (SOECs); protonic ceramic fuel cells (PCFCs); protonic ceramic electrolysis cells (PCECs); reversible solid oxide cells (rSOCs); sensors; energy conversion; steam electrolysis; proton transportation; chemical engineering, synthesis and characterization of solid oxide materials with different nature of conductivity (ionic, electronic, mixed) for energy conversion technologies; design and fabrication of solid oxide electrochemical cells (fuel cells, electrolysis cells, sensors, pumps, converters, membrane reactors)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The field of high-temperature electrochemistry covers many current demands related with effective energy conversion, environmental safety, sustainable developments, and economic reasons. As a part of this field, solid oxide materials with different functionalities as well as various electrochemical devices based on them possess high applicability prospects in terms of energy generation in power systems, which satisfy the mentioned demands. This Issue is related to the recent achievements in materials science and to the development of solid oxide electrochemical devices. The Issues include the crystal structure, electronic structure, microstructure and related transport properties of oxygen ionic and protonic electrolytes, mixed electronic and ionic conductors, and triple conducting materials. The design, fabrication techniques, scale-up production, and long-term tests of the solid oxide electrochemical devices are of great interest for researchers working in this field. Special attention is paid to the different scale modeling of solid oxide fuel cells, including protonic ceramic fuel cells. On behalf of the editorial team, we have pleasure to invite all of you to contribute to the Special Issue, High-Temperature Electrochemistry of Solid Oxide Materials and Systems, with your state-of-the-art findings.

Prof. Dr. Maxim Ananyev
Dr. Dmitry Medvedev
Guest Editors

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Published Papers (6 papers)

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Research

12 pages, 5141 KiB  
Article
Application of Promising Electrode Materials in Contact with a Thin-Layer ZrO2-Based Supporting Electrolyte for Solid Oxide Fuel Cells
by Denis A. Osinkin, Ekaterina P. Antonova, Alena S. Lesnichyova, Evgeniy S. Tropin, Mikhail E. Chernov, Efim I. Chernov, Andrey S. Farlenkov, Anna V. Khodimchuk, Vadim A. Eremin, Anastasia I. Kovrova, Anton V. Kuzmin and Maxim V. Ananyev
Energies 2020, 13(5), 1190; https://doi.org/10.3390/en13051190 - 5 Mar 2020
Cited by 14 | Viewed by 3096
Abstract
The paper presents the results of an investigation into thin single- and triple-layer ZrO2-Sc2O3-based electrolytes prepared using the tape-casting technique in combination with promising electrodes based on La2NiO4+δ and Ni-Ce0.8Sm0.2O [...] Read more.
The paper presents the results of an investigation into thin single- and triple-layer ZrO2-Sc2O3-based electrolytes prepared using the tape-casting technique in combination with promising electrodes based on La2NiO4+δ and Ni-Ce0.8Sm0.2O2-δ materials. It is shown that pressing and joint sintering of single electrolyte layers allows multilayer structures to be obtained that are free of defects at the layer interface. Electrical conductivity measurements of a triple-layer electrolyte carried out in longitudinal and transverse directions with both direct and alternating current showed resistance of the interface between the layers on the total resistance of the electrolyte to be minimal. Long-term tests have shown that the greatest degradation in resistance over time occurs in the case of an electrolyte with a tetragonal structure. Symmetrical electrochemical cells with electrodes fabricated using a screen-printing method were examined by means of electrochemical impedance spectroscopy. The polarization resistance of the electrodes was 0.45 and 0.16 Ohm∙cm2 at 800 °C for the fuel and oxygen electrodes, respectively. The distribution of relaxation times method was applied for impedance data analysis. During tests of a single solid oxide fuel cell comprising a supporting triple-layer electrolyte having a thickness of 300 microns, a power density of about 160 mW/cm2 at 850 °C was obtained using wet hydrogen as fuel and air as an oxidizing gas. Full article
(This article belongs to the Special Issue High-Temperature Electrochemistry of Solid Oxide Materials and Systems)
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10 pages, 4195 KiB  
Article
Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ
by Denis A. Osinkin, Anna V. Khodimchuk, Natalia M. Porotnikova, Nina M. Bogdanovich, Andrey V. Fetisov and Maxim V. Ananyev
Energies 2020, 13(1), 250; https://doi.org/10.3390/en13010250 - 3 Jan 2020
Cited by 27 | Viewed by 3339
Abstract
The oxygen surface kinetics of Sr2Fe1.5Mo0.5O6−δ was determined using the 16O2/18O2 isotope exchange method with gas phase analysis at 600–800 °C. The heterogeneous exchange rates (rH) and [...] Read more.
The oxygen surface kinetics of Sr2Fe1.5Mo0.5O6−δ was determined using the 16O2/18O2 isotope exchange method with gas phase analysis at 600–800 °C. The heterogeneous exchange rates (rH) and the oxygen diffusion coefficients (D) were calculated by processing the concentration dependences of the 18O fraction using Ezin’s model. The rates of oxygen dissociative adsorption (ra) and incorporation (ri) were calculated based on a model using the three exchange type rates. It has been established that the rates ra and ri were comparable in this temperature range. Assumptions were made about the effect of the chemical composition of the surface on the rate of oxygen adsorption. It was found that the oxygen exchange coefficient (k) of Sr2Fe1.5Mo0.5O6−δ is comparable to that of La0.6Sr0.4MnO3±δ oxide. High values of the oxygen diffusion coefficient were found for Sr2Fe1.5Mo0.5O6−δ. The values were comparable to those of the double cobaltite praseodymium-barium and exceed by more than an order those of lanthanum-strontium manganite. Full article
(This article belongs to the Special Issue High-Temperature Electrochemistry of Solid Oxide Materials and Systems)
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8 pages, 3803 KiB  
Article
Direct AC/DC Heating of Oxygen Transport Membranes
by Ivan Kovalev, Alexander Vorobyev, Artem Bagishev, Mikhail Popov, Marat Sharafutdinov, Alexander Titkov, Sergey Bychkov and Alexander Nemudry
Energies 2020, 13(1), 30; https://doi.org/10.3390/en13010030 - 19 Dec 2019
Cited by 4 | Viewed by 2233
Abstract
This article is devoted to the development of the direct resistive heating of oxygen transport membranes technique. In this case, DC was selected to perform direct heating. The effect of DC on the oxygen fluxes and the microstructure of the membrane was studied. [...] Read more.
This article is devoted to the development of the direct resistive heating of oxygen transport membranes technique. In this case, DC was selected to perform direct heating. The effect of DC on the oxygen fluxes and the microstructure of the membrane was studied. It is shown that in the short-term experiment with DC, a positive significant effect on the oxygen transport was found, while sample exposure under the influence of DC for a long period of time had a significant negative effect on the microstructure of the membrane. Full article
(This article belongs to the Special Issue High-Temperature Electrochemistry of Solid Oxide Materials and Systems)
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16 pages, 7438 KiB  
Article
Formation of Conductive Oxide Scale on 33NK and 47ND Interconnector Alloys for Solid Oxide Fuel Cells
by V.A. Eremin, A.A. Solodyankin, S.A. Belyakov, A.V. Khodimchuk, A.S. Farlenkov, D.A. Krainova, N.S. Saetova, A.V. Kuzmin, A.S. Artamonov, R. Steinberger-Wilckens and M.V. Ananyev
Energies 2019, 12(24), 4795; https://doi.org/10.3390/en12244795 - 16 Dec 2019
Cited by 8 | Viewed by 2715
Abstract
: Two grades of chromium-free alloys were studied in order to apply them as interconnectors for solid oxide fuel cells. The surface modification methods were proposed for each alloy with the purpose of forming of oxide scales considering the required physicochemical properties. Investigations [...] Read more.
: Two grades of chromium-free alloys were studied in order to apply them as interconnectors for solid oxide fuel cells. The surface modification methods were proposed for each alloy with the purpose of forming of oxide scales considering the required physicochemical properties. Investigations of the structure and properties of the obtained oxide scales were performed and the efficiency of the chosen surface modification methods was approved. The samples with the surface modification exhibited higher conductivity values in comparison with the nonmodified samples. A compatibility study of samples with surface modification and glass sealant of chosen composition was accomplished. The modified samples demonstrated good adhesion during testing and electrical resistance less than 40 mOhm/cm2 at 850 °C in air, which allowed us to recommend these alloys with respective modified oxide scales as interconnectors for SOFC. Full article
(This article belongs to the Special Issue High-Temperature Electrochemistry of Solid Oxide Materials and Systems)
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11 pages, 2726 KiB  
Communication
Tailoring Ni and Sr2Mg0.25Ni0.75MoO6−δ Cermet Compositions for Designing the Fuel Electrodes of Solid Oxide Electrochemical Cells
by Lubov S. Skutina, Aleksey A. Vylkov, Dmitry K. Kuznetsov, Dmitry A. Medvedev and Vladimir Ya. Shur
Energies 2019, 12(12), 2394; https://doi.org/10.3390/en12122394 - 21 Jun 2019
Cited by 9 | Viewed by 3099
Abstract
The design of new electrode materials for solid oxide electrochemical cells, which are stable against redox processes as well as exhibiting carbon/sulphur tolerance and high electronic conductivity, is a matter of considerable current interest as a means of overcoming the disadvantages of traditional [...] Read more.
The design of new electrode materials for solid oxide electrochemical cells, which are stable against redox processes as well as exhibiting carbon/sulphur tolerance and high electronic conductivity, is a matter of considerable current interest as a means of overcoming the disadvantages of traditional Ni-containing cermets. In the present work, composite materials having the general formula (1−x)Sr2Mg0.25Ni0.75MoO6−δ + xNiO (where x = 0, 15, 30, 50, 70 and 85 mol.%) were successfully prepared to be utilised in solid oxide fuel cells. A detailed investigation of the thermal, electrical, and microstructural properties of these composites, along with their phase stability in oxidising and reducing atmospheres, was carried out. While possessing low thermal expansion coefficient (TEC) values, the composites having low Ni content (15 mol.%–70 mol.%) did not satisfy the requirement of high electronic conductivity. Conversely, the 15Sr2Mg0.25Ni0.75MoO6−δ + 85NiO samples demonstrated very high electrical conductivity (489 S sm−1 at 850 °C in wet H2) due to well-developed Ni-based networks, and no deterioration of thermal properties (TEC values of 15.4 × 10−6 K−1 in air and 14.5 × 10−6 K−1 in 50%H2/Ar; linear expansion behaviour in both atmospheres). Therefore, this material has potential for use as a component of a fuel cell electrode system. Full article
(This article belongs to the Special Issue High-Temperature Electrochemistry of Solid Oxide Materials and Systems)
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12 pages, 2972 KiB  
Article
PrBaCo2O6−δ-Ce0.8Sm0.2O1.9 Composite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells: Stability and Cation Interdiffusion
by Dmitry Tsvetkov, Nadezhda Tsvetkova, Ivan Ivanov, Dmitry Malyshkin, Vladimir Sereda and Andrey Zuev
Energies 2019, 12(3), 417; https://doi.org/10.3390/en12030417 - 29 Jan 2019
Cited by 20 | Viewed by 4473
Abstract
The single-phase oxide PrBaCo2O6−δ and composites (100 − y)PrBaCo2O6−δ-yCe0.8Sm0.2O1.9 (y = 10–30 wt.%) were investigated as cathode materials for intermediate-temperature solid oxide fuel cells. The chemical compatibility, [...] Read more.
The single-phase oxide PrBaCo2O6−δ and composites (100 − y)PrBaCo2O6−δ-yCe0.8Sm0.2O1.9 (y = 10–30 wt.%) were investigated as cathode materials for intermediate-temperature solid oxide fuel cells. The chemical compatibility, cation interdiffusion, thermal expansion and dc conductivity were studied. As a result, strong interdiffusion of Pr and Sm was found between PrBaCo2O6−δ and Ce0.8Sm0.2O1.9. This leads to only insignificantly decreasing thermal expansion coefficient of composite with increasing fraction of Ce0.8Sm0.2O1.9 and, thus, mixing PrBaCo2O6−δ with Ce0.8Sm0.2O1.9 does not improve thermal expansion behavior of the cathode material. Moreover, formation of poorly-conducting BaCeO3, caused by chemical interaction between the double perovskite and doped ceria, was shown to lead to pronounced drop in the electrical conductivity of the composite cathode material with increasing Ce0.8Sm0.2O1.9 content. Full article
(This article belongs to the Special Issue High-Temperature Electrochemistry of Solid Oxide Materials and Systems)
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