{"id":15496,"date":"2020-12-23T08:07:04","date_gmt":"2020-12-23T03:07:04","guid":{"rendered":"http:\/\/ihte.ru\/?page_id=15496"},"modified":"2026-03-27T09:34:37","modified_gmt":"2026-03-27T04:34:37","slug":"news-archive","status":"publish","type":"page","link":"https:\/\/ihte.ru\/?page_id=15496","title":{"rendered":"News archive"},"content":{"rendered":"

07\/07\/2025: <\/strong><\/span>The article \u00abOxygen-ionic transport of (Pr,Ba)FeO3<\/sub>-based perovskite materials: Results from oxygen permeability experiments\u00bb was published in the Journal of Membrane Science (https:\/\/doi.org\/10.1016\/j.memsci.2025.124365<\/a><\/span>). Article abstract is as follows. Fe-containing perovskite materials have attracted considerable attention in the field of high temperature electrochemistry as potential electrode materials for solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs). Belonging to the cobalt-free family of materials, they exhibit high redox stability, acceptable thermal expansion behavior, and good electronic conductivity. However, in order to design electrochemically active electrodes towards oxygen reduction and evolution reactions, the oxygen-ionic conductivity of the iron-based materials must also be high. In the present work, the oxygen-ion transport behavior of Pr0.6<\/sub>Ba0.4<\/sub>FeO3\u2013\u03b4<\/sub> (PBF) was comprehensively investigated by oxygen permeation experiments as a function of doping effects (Pr0.6<\/sub>Ba0.4<\/sub>Fe0.9<\/sub>M0.1<\/sub>O3\u2013\u03b4<\/sub>, M = Ni, Cu, and Co) and external parameters. In detail, three-layer porous|dense| porous membranes with a dense layer thickness of ~100 \u03bcm were successfully prepared by the tape calendaring method followed by their electrochemical characterization. It was found that the highest oxygen permeation fluxes were obtained for the basic PBF composition, while the Co-containing membrane showed the inferior permeation properties. The Ni- and Cu-doped PBF materials were intermediate in permeation properties and derived oxygen-ionic conductivity. These data, together with other functional properties tailored by doping, make Ni- and Cu-containing materials one of the most promising derivatives from (Pr,Ba)FeO3\u2013\u03b4<\/sub> for electrochemical applications.<\/span><\/p>\n

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10\/06\/2025: <\/strong><\/span>Two members of our laboratory, together with a colleague from Saint-Petersburg State University, wrote an article \u00abThermomechanical behavior of promising mixed ion-electron conductors based on co-doped barium ferrite\u00bb (10.15826\/elmattech.2025.4.048<\/a><\/span>). Mixed ion-electron conductors (MIECs) represent a class of materials that have emerged as promising candidates for various applications in energy conversion and storage fields. These materials, which may demonstrate triple conducting behavior, are especially promising as symmetrical electrodes in protonic ceramic fuel cells or as oxygen-permeable membranes. Notable representatives of these materials include perovskites based on barium ferrite with an ABO3<\/sub> structure, which might be doped or co-doped with various dopants. This short communication focuses on the investigation of the thermomechanical characteristics of Pr0.6<\/sub>Ba0.4<\/sub>FeO3\u2013\u03b4<\/sub>, Pr0.6<\/sub>Ba0.4<\/sub>Fe0.9<\/sub>Ni0.1<\/sub>O3\u2013\u03b4<\/sub> and (Pr0.6<\/sub>Ba0.4<\/sub>)0.9<\/sub>Fe0.9<\/sub>Ni0.1<\/sub>O3\u2013\u03b4<\/sub> materials. Their phase stability was investigated by high-temperature XRD analysis, while the contributions of thermal and chemical expansions as parts of the total expansion were analyzed between 25 and 1000 \u00b0C. According to the results obtained, at temperatures above 500 \u00b0C, changes in the thermal dependence patterns of the unit cell parameters for all the samples were observed. This phenomenon may be attributed to dimensional factors resulting from the variation in the ionic radii of the B-sublattice cations upon reduction of the B-cations and oxygen vacancy formation. A comprehensive analysis of the obtained results enables the formulation of conclusions regarding the rational level of co-doping for these materials, with the objective of optimizing their thermomechanical characteristics by reducing the chemical expansion contribution.<\/span><\/p>\n

12\/05\/2025: <\/strong><\/span>A research work ‘Ion-conducting materials based on Y-doped SrSnO3<\/sub>: Features of ceramics preparation and transport properties’ has been accepted in the Journal of the European Ceramic Society, https:\/\/doi.org\/10.1016\/j.jeurceramsoc.2025.117441<\/a><\/span>. In this paper, dense SrSn1\u2013x<\/sub>Yx<\/sub>O3\u2013\u03b4<\/sub> (x = 0, 0.05, 0.1, 0.15, 0.2) ceramic materials were prepared and then characterized in terms of microstructure, thermomechanical, and electrical transport properties. Within the investigated concentration range (0 \u2264 x \u2264 0.2), all materials are found to be single phase with a certain variation of crystal structure symmetry depending on composition and temperature. No detectable dopant exsolution or strontium segregation is found in either the surface or bulk portions of the ceramic samples, but their conductivity shows an atypical behavior, dropping significantly across the Y content (x) boundary of 0.1\/0.15. This can be attributed to the microstructural features of the prepared ceramics, consisting of the formation of either conventionally spherical or unusual rectangular (anisotropic) grains. Possible explanations for the observed results are also presented. Therefore, this work highlights the basic properties of Y-doped SrSnO3, including structural, microstructural, thermal, and electrical aspects at high temperatures. To the best of our knowledge, no systematic studies on the SrSn1\u2013x<\/sub>Yx<\/sub>O3\u2013\u03b4<\/sub> system have been published in the literature.<\/span><\/p>\n

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02\/04\/2025: <\/strong><\/span>Chemical Engineering Journal<\/strong> has accepted a new review paper entitled ‘Engineering the one-pot synthesized Ba(Ce,Fe)O3<\/sub>-based composites as triple-conducting electrodes for solid oxide electrochemical cell applications’, https:\/\/doi.org\/10.1016\/j.cej.2025.162320<\/span><\/a>. In the present review, dual-phase composites based on BaCe1\u2212x<\/sub>Fex<\/sub>O3\u2212\u03b4<\/sub> compositions and their doped derivatives were considered as research objects. These compounds have attracted considerable research interest because of their potential as triple-conducting materials, allowing the simultaneous transport of three charge carriers (holes, oxygen ions, and protons) within two different composite components (BaCeO3<\/sub>— and BaFeO3<\/sub>-based phases). To understand their prospects for electrochemical applications, information on phase state (two-phase boundary formation, crystal structures of each component), transport properties (total electronic conductivity, contribution of oxygen-ion and proton transport), thermomechanical properties (thermal expansion and chemical strain effects due to high-temperature chemical processes), and electrochemical performance (for symmetrical cells and single fuel cells) was collected and comprehensively analyzed.<\/span><\/p>\n

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02\/04\/2025: <\/strong><\/span>A new research paper entitled ‘High-temperature phase relationships of BaSn1\u2212x<\/sub>Inx<\/sub>O3\u2212\u03b4<\/sub> perovskite materials over a wide In-content variation’ has been published in the Ceramics International<\/strong> journal, https:\/\/doi.org\/10.1016\/j.ceramint.2025.04.015<\/span><\/a>. In the present study, the synthesis and characterization of BaSn1\u2013x<\/sub>Inx<\/sub>O3\u2013\u03b4<\/sub> materials (0.05 \u2264 x \u2264 0.60) were conducted through high-temperature XRD analysis, aiming to elucidate the correlations between the composition, structure, and thermochemical expansion behavior of such stannates. Single-phase materials can be formed over the entire concentration range investigated, revealing the existence of a very wide solid solution range without the appearance of impurity phases. As Ba-based perovskites with a large number of oxygen vacancies, BaSn1\u2212x<\/sub>Inx<\/sub>O3\u2212\u03b4<\/sub> are capable of reversible water uptake in humid atmospheres. This process induces local structural distortions in the perovskites, resulting in pronounced chemical expansion effects along with conventional thermal expansion. Chemical expansion was found to be significant for highly doped stannates (in both heating and cooling modes); as a result, the lattice parameters of the BaSn1\u2212x<\/sub>Inx<\/sub>O3\u2212\u03b4<\/sub> compounds deviated from a linear trend with temperature variation. However, for the high-temperature range (above 600 \u00b0C), the studied materials exhibited predominant thermal expansion behavior, allowing the evaluation of the pure thermal expansion coefficients. Therefore, the findings of the present study provide significant insights into the thermal and chemical expansion of proton-conducting oxide materials, particularly those with highly disordered impurity structures.<\/span><\/p>\n

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17\/03\/2025: <\/strong><\/span>Two members of the lab published a new review in collaboration with Chinese colleagues, https:\/\/doi.org\/10.1002\/adfm.202416651<\/span><\/a>. The review entitled ‘Recent advances and challenges in perovskite-based protonic ceramic electrolytes: design strategies and fabrication innovations’ (Advanced Functional Materials<\/strong> journal) covers state-of-the-art developments in protonic ceramic electrolyte fabrication technologies, including powder synthesis, thin-film deposition, more controllable sintering processes and interface treatments for structural integrity and ionic conductivity. This review comprehensively summarizes the most recent design approaches and optimization strategies for perovskite-based protonic ceramic electrolyte materials and is crucial for advancing the commercialization of protonic ceramic electrochemical cells.\u00a0<\/span><\/p>\n

12\/03\/2025: <\/strong><\/span>A new research paper ‘The effect of a CuO sintering additive on the sinterability of Ba-based perovskite electrolytes for protonic ceramic electrochemical cell applications’ has just been accepted for publication in the Journal of Materials Chemistry A<\/strong> (https:\/\/doi.org\/10.1039\/D5TA00875A<\/span><\/a>). In the present study, BaSn0.8<\/sub>Y0.2<\/sub>O3\u2212\u03b4<\/sub> + x wt% CuO ceramic samples (x = 0, 0.25, 0.5, 0.75, 1 and 2) were successfully obtained in gas-tight forms and subsequently examined in detail with respect to their microstructural and electrochemical properties. This was done to gain a deeper understanding of the actual impact of the CuO sintering additive. The present results offer insights into the diverse effects of sintering additives on the physicochemical and functional properties of proton-conducting perovskite oxides. These findings can serve as supplementary information in the field of scalable fabrication of proton-conducting ceramics and related protonic ceramic cells for electrochemical applications.\u00a0<\/span><\/p>\n

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23\/01\/2025: <\/strong><\/span>The Ceramics International<\/strong> journal has accepted a new work entitled ‘Phase relationships and thermal behavior of one-pot synthesized dual-phase BaCe0.5<\/sub>Fe0.5<\/sub>O3\u2013\u03b4<\/sub> composites’, https:\/\/doi.org\/10.1016\/j.ceramint.2024.11.324<\/span><\/a>. Within the present work, a BaCe0.5<\/sub>Fe0.5<\/sub>O3\u2013\u03b4<\/sub> composite (extensively investigated in the literature as a triple conductor) was prepared as both dense and porous ceramics. The refinement of the compositions for both Ce- and Fe-enriched phases, as well as the determination of the thermal expansion behaviors of both the basic components and the composite as a whole were provided. The experimental results demonstrate that the Ce- and Fe-based phases exhibit markedly disparate thermomechanical responses, which represents a significant limitation for the joint application of BaCe0.5<\/sub>Fe0.5<\/sub>O3\u2013\u03b4<\/sub>-derived electrodes with a range of electrolyte representatives. While the thermomechanical discrepancy can be reduced for the porous state of the electrodes, greater attention should be paid to the microstructural integrity of such electrodes and the quality of the electrolyte\/electrode interface under long-term and cycling operating conditions. Therefore, this work provides complementary information on the various functional properties of dual-phase BaCe0.5<\/sub>Fe0.5<\/sub>O3\u2013\u03b4<\/sub> composites.<\/span><\/p>\n

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06\/01\/2025: <\/strong><\/span>The new paper entitled ‘Localization of CuO, NiO, and Co3<\/sub>O4<\/sub> sintering additives in dense proton-conducting perovskite ceramics based on BaSnO3<\/sub>‘ has been published in the International Journal of Hydrogen Energy<\/strong>, https:\/\/doi.org\/10.1016\/j.ijhydene.2024.11.490<\/a><\/span>. In this study, we present a comprehensive characterization of ceramic materials based on Y-doped BaSnO3<\/sub> prepared with the addition of 1 wt% of three sintering additives (copper, cobalt, and nickel oxides). Although these introduced oxides belong to a group of compounds with similar physicochemical properties, each additive exerts a distinct influence on the microstructural and electrochemical properties of the ceramics owing to their own chemical localization features. The present work provides a detailed discussion of these features, employing a precise microstructural analysis of both the as-prepared ceramics and their reduced derivatives to facilitate exsolution processes.<\/span><\/p>\n

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