Browsing by Author "Gogacz, Michał"

Now showing 1 - 5 of 5

Access status: Open Access ,
A review of nanofiber electrodes and the in situ exsolution of nanoparticles for solid oxide cells
(2025) Lach, Jakub; Gogacz, Michał; Winiarz, Piotr; Ling, Yihan; Zhou, Mingjiong; Zheng, Kun
Wydział Energetyki i Paliw
Solid oxide cells (SOCs) can operate efficiently in solid oxide fuel cell (SOFC) and/or solid oxide electrolysis cell (SOEC) modes, and are one of the most promising electrochemical devices for energy conversion and storage, facilitating the integration of renewable energies with the electric grid. However, the SOC electrodes suffer performance and stability issues, especially in the case of fuel electrodes when SOCs are fueled by cheaper and more available fuels such as methane and natural gas. Typical Ni-YSZ cermet fuel electrodes suffer problems of coarsening, carbon deposition, and sulfur poisoning. Therefore, developing new electrodes using novel design strategies for SOCs is crucial. In this review work, the fuel electrode development strategies including the in situ exsolution of nanoparticles, multi-elemental nanocatalysts, and nanofiber materials have been reviewed and summarized for the design of new electrodes for SOCs. Nanofiber electrodes with in situ exsolved nanoparticles, which combine the advantages of a unique nanofiber microstructure and stable and active exsolved nanoparticles, are of great interest and significantly contribute to the development of high-performance fuel electrodes for SOCs.
Access status: Open Access ,
Controlled exsolution-dissolution in double perovskites enables symmetrical-capable high-performance SOFC electrodes
(2026) Lach, Jakub; Zheng, Kun; Radu, Cristian; Kryński, Marcin; Gogacz, Michał; Ling, Yihan; Klimkowicz, Alicja; Łapiński, Marcin
Wydział Energetyki i Paliw
In situ exsolution has emerged as a powerful strategy for tailoring fuel electrode catalysts in solid oxide fuel cells (SOFCs), yet its integration with reversible exsolution-dissolution processes and its application to symmetrical-capable electrode design remain largely unexplored. Here, we demonstrate controlled exsolution-dissolution in nanofiber double perovskites as a rational route to engineer high-performance SOFC electrodes operable in both symmetrical and anode-supported configurations. $Sm_{0.9}Ba_{0.9}Mn_{1.8−x}Fe_{x}Co_{0.1}Ni_{0.1}O_{5+δ}$ nanofiber perovskites enable composition-dependent control of nanoparticle evolution. Under reducing conditions, socketed Co–Ni–Fe alloy nanocatalysts exsolve and partially embed into the perovskite lattice, while oxidation induces their transformation into $Fe_{3−x−y}Ni_{x}Co_{y}O_{4}$-type hollow core–shell nano-oxides via a Kirkendall-type mechanism. The nanofiber architecture promotes smaller and more densely distributed nanoparticles compared to powders, enhancing catalytic activity and redox stability. The optimized composite electrode delivers a low polarization resistance of 0.046 Ω cm2 at 800 °C. Anode-supported cells achieve a peak power density of 1112 mW cm−2 at 850 °C and 877 mW cm−2 at 800 °C, while symmetrical cells deliver 816 mW cm−2 at 800 °C with stable operation. This work establishes controlled exsolution-dissolution as a versatile platform for designing symmetrical-capable high-performance SOFC electrodes and highlights hollow core–shell nanostructure engineering as a powerful strategy for durable solid oxide electrochemical systems.
Access status: Open Access ,
Designing high-performance quasi-symmetrical solid oxide cells with a facile chemical modification strategy for Sr2Fe2-xWxO6-δ ferrites electrodes with in situ exsolution of nanoparticles
(2023) Zheng, Kun; Lach, Jakub; Czaja, Paweł; Gogacz, Michał; Czach, Patryk; Brzoza-Kos, Agnieszka; Winiarz, Piotr; Luo, Jie
Wydział Energetyki i Paliw
The chemical modification of perovskites is one of the most effective design strategies for electrode materials for solid oxide cells. In this work, the tungsten doping in $Sr_{2}Fe_{2−x}W_{x}O_{6−δ}$ shows a significant impact on their physicochemical properties, and it leads to a substantial change of electrochemical properties in the air and reducing conditions, with $Sr_{2}Fe_{1.8}W_{0.2}O_{6−δ}$ (Rp = 0.06 Ω cm2 at 800 °C stable for 100 h in air) and $Sr_{2}Fe_{1.6}W_{0.4}O_{6−δ}$ (Rp = 0.56 Ω cm2 at 800 °C over 100 h in 5 vol% $H_{2}/Ar$) being the best air and fuel electrode candidates, respectively. We have proposed an attractive design of high-performance quasi-symmetrical solid oxide cells with $80%Sr_{2}Fe_{1.8}W_{0.2}O_{6−δ}+20%GDC$ | LSGM | $80%Sr_{2}Fe_{1.6}W_{0.4}O_{6−δ}+20%GDC$, demonstrating excellent power outputs ($874 mW cm^{−2}$ at 850 °C in wet $H_{2}$) and good current density of 743 mA $cm^{−2}$ at 1.5 V in electrolysis mode at 750 °C. A good performance of 451 mW $cm^{−2}$ was also recorded in wet $CH_{4}$ at 800 °C. The in situ exsolved metallic iron nanoparticles decorated on the $Sr_{2}Fe_{1.6}W_{0.4}O_{6−δ}$ anode contribute to the excellent electrochemical performance of cells. This study provides a successful scenario for designing high-performance symmetrical solid oxide cells with a facile chemical modification strategy for ferrites electrodes with in situ exsolution of nanoparticles.
Access status: Open Access ,
Electrospun Nanofiber Electrodes with in situ Exsolved Nanocatalysts for Symmetrical SOCs
(2023) Lach, Jakub; Zheng, Kun; Gogacz, Michał; Czaja, Paweł; Luo, Jie; Brzoza-Kos, Agnieszka
Wydział Energetyki i Paliw
In this work, A-site deficient $Sm_{0.9}Ba_{0.9}Mn_{1.8−x}Fe_{x}Co_{0.1}Ni_{0.1}O_{6−δ}$ (x = 0, 0.45 and 0.9) double perovskites with in situ exsolved nanoparticles were successfully obtained and evaluated as electrode materials for symmetrical Solid Oxide Cells (SOCs). All obtained oxides belong to the P4/nmm tetragonal system, and a phase transition from P4/nmm to P4/mmm was recorded by the HT-XRD in the air. The in situ exsolution of nanoparticles has been confirmed by the XRD and SEM analysis. The proposed materials present excellent redox stability and moderate thermal expansion coefficients. Electrospun nanofibers (with 150 nm diameter) were successfully fabricated, indicating an excellent potential application in the electrode. The results show the developed A-site deficient double perovskites with iron doping at Mn-site can be potentially applied as novel electrode materials for symmetrical SOCs.
Access status: Open Access ,
Gospodarka wodorowa jako segment rozwoju energetyki rozproszonej
(Wydawnictwa AGH, 2025) Adamczyk, Bartosz; Boruta, Piotr; Bujok, Tomasz; Chmielniak, Tomasz; Dudek, Magdalena; Gogacz, Michał; Gołdasz, Andrzej; Kalawa, Wojciech; Lach, Jakub; Lis, Łukasz; Mika, Łukasz; Naperty, Rafał; Nowak, Wojciech; Radomska, Ewelina; Raźniak, Andrzej; Sztekler, Karol; Winiarz, Piotr; Wójcikowski, Artur; Zasada-Chruścińska, Katarzyna; Zheng, Kun; Zych, Anita
The article presents current topics in the development chain of the hydrogen economy and highlights the R&D initiatives of researchers from the Faculty of Energy and Fuels and the Energy Center of the AGH University of Krakow. The main research trends presented in the article concern the following topics: i) the production of low-emission hydrogen from natural gas, biomass and water electrolysis, ii) the storage and use of hydrogen to generate electricity and heat in engines, gas turbines or fuel cells, iii) interdisciplinary issues of developing new materials or diagnostic methods for electrochemical devices. This study was prepared on the basis of the authors’ experience in carrying out numerous R&D projects, also in cooperation with domestic and foreign industry or in international scientific cooperation. The article also presents selected research stations and devices intended for conducting interdisciplinary research in the field of hydrogen.