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476 results on '"Świerczek, Konrad"'

13. Atomic‐Scale Engineering for New Generation Air Electrode Materials of Solid Oxide Cells: Quintuple Perovskite Sm2Ba3Co2Fe3O15‐δ with Twinned Crystal Structure.

Author

Sun, Zhipeng, Shen, Zhuoli, Du, Zhihong, Zhang, Yang, Gong, Yue, Zhang, Min, Wang, Kexin, Świerczek, Konrad, Zeng, Jianrong, and Zhao, Hailei

Subjects
ELECTRODE performance, ELECTROCHEMICAL electrodes, ELECTRODE reactions, THERMAL expansion, THERMAL batteries
Abstract

The catalytic activity and thermomechanical stability of electrode materials are crucial for the efficient operation of reversible solid oxide cell (rSOC). However, these two traits often impose limitations on one another. In this work, a unique quintuple perovskite Sm2Ba3Co2Fe3O15‐δ (SBCF‐5L), comprising of A‐site ordered double perovskite layers and disordered simple perovskite layers, is reported as a high‐performance air electrode material for rSOC. The designed SBCF‐5L material exhibits a highly symmetrical tetragonal structure (pseudo‐cubic) with an isotropic thermal expansion and a limited chemical expansion. The formation barriers for oxygen vacancies are comparable between A‐site ordered layers and disordered simple perovskite layers, resulting in a high concentration of oxygen vacancies and 3D‐like bulk mobility of oxygen ions. Perpendicularly twinned nanodomains are developed in the particles, providing more active sites for surface electrode reaction. When applied in electrolyte‐supported cells, the SBCF‐5L electrode exhibits excellent electrochemical performance with low polarization resistance of 0.017 Ω cm−2, high power density of 1.01 W cm−2 and high electrolysis current density of 1.08 A cm−2 at 1.3 V at 800 °C in fuel cell and electrolysis modes, respectively. This study introduces a new approach of atomic‐scale engineering to rationally design a new generation of air electrodes for rSOC. [ABSTRACT FROM AUTHOR]

Published
2024
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39. Air-Stable and Eco-Friendly Symmetrical Imine with Thiadiazole Moieties in Neutral and Protonated form for Perovskite Photovoltaics.

Author

Bogdanowicz, Krzysztof Artur, Iwan, Agnieszka, Dysz, Karolina, Przybyl, Wojciech, Marzec, Monika, Cichy, Kacper, and Świerczek, Konrad

Subjects
DIAMINES, NUCLEAR magnetic resonance, THIADIAZOLES, PROTON magnetic resonance, INFRARED cameras, PHOTOVOLTAIC power generation, PEROVSKITE
Abstract

This paper proposes molecular and supramolecular concepts for potential application in perovskite solar cells. New air-stable symmetrical imine, with thiadiazole moieties PPL2: (5E,6E)-N2,N5-bis(4-(diphenylamino)benzylidene)-1,3,4-thiadiazole-2,5-diamine), as a hole-transporting material was synthesised in a single-step reaction, starting with commercially available and relatively inexpensive reagents, resulting in a reduction in the cost of the final product compared to Spiro-OMeTAD. Moreover, camphorsulfonic acid (CSA) in both enantiomeric forms was used to change the HOMO-LUMO levels and electric properties of the investigated imine-forming complexes. Electric, optical, thermal, and structural studies of the imine and its complexes with CSA were carried out to characterise the new material. Imine and imine/CSA complexes were also characterised in depth by the proton Nuclear Magnetic Resonance 1H NMR method. The position of nitrogen in the thidiazole ring influences the basicity of donor centres, which results in protonation in the imine bond. Simple devices of ITO/imine (with or without CSA(−) or CSA(+))/Ag/ITO architecture were constructed, and a thermographic camera was used to find the defects in the created devices. Electric behaviour was also studied to demonstrate conductivity properties under the forward current. Finally, the electrical properties of imine and its protonated form with CSA were compared with Spiro-OMeTAD. In general, the analysis of thermal images showed a very similar response of the samples to the applied potential in terms of the homogeneity of the formed organic layer. The TGA analysis showed that the investigated imine exhibits good thermal stability in air and argon atmospheres. [ABSTRACT FROM AUTHOR]

Published
2024
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41. Temperature and E-Poling Evolution of Structural, Vibrational, Dielectric, and Ferroelectric Properties of Ba1−xSrxTiO3 Ceramics (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.45)

Author

Suchanicz, Jan, primary, Sitko, Dorota, additional, Stanuch, Krzysztof, additional, Świerczek, Konrad, additional, Jagło, Grzegorz, additional, Kruk, Andrzej, additional, Kluczewska-Chmielarz, Kamila, additional, Konieczny, Krzysztof, additional, Czaja, Piotr, additional, Aleksandrowicz, Jakub, additional, Wieczorek, Wojciech, additional, Grygierek, Justyna, additional, Sokolowski, Mariusz, additional, Stachowski, Grzegorz, additional, Antonova, Maija, additional, and Sternberg, Andris, additional

Published
2023
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