Publication date: 10th April 2024
The group of BaLnCo2O6-δ cobaltites (Ln – lanthanides) are promising well-recognized mixed ionic-electronic conductors, with a mobile electrons/electron holes, oxygen ions, and, in some cases, protons. Such a materials can be applied in the hydrogen technology sector e.g. as electrodes for proton ceramic fuel cells and electrolysers [1,2]. By implementation of multiple lanthanides in equimolar proportions into the Ln sublattice these materials can become the so-called high-entropy oxides. The introduction of many cations can alter local crystal ordering and introduce significant lattice strains. This in turn can lead to new properties [3,4].
This work focuses on materials with general formula Ba(Ln1/xLn’1/xLn’’1/xLn3’1/x…Lnx’1/x)Co2O6-δ (8 ≤ x ≤ 14), where Ln, Ln’, Ln’’ and so on are lanthanide. In such a way we created high-entropy materials with up to 14 different lanthanides occupying the same lattice site. The crystal structure was characterized using X-ray diffraction (XRD) and Rietveld refinement.
Oxygen non-stoichiometry was studied by iodometric titration and thermogravimetric analysis (TGA). Finally, the temperature dependence of total electrical conductivity was investigated in air by the means of DC-4W technique. In order to analyse predominant charge carriers and their concentration, the total Seebeck coefficient measurements were performed by 4W method, both in wet and dry air.
Financial support of these studies from Gdańsk University of Technology by the DEC-3/2/IDUB/III.1a/Ra/2023 grant under the Radium - ‘Excellence Initiative - Research University’ program is gratefully acknowledged.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.