Publication date: 10th April 2024
Ruddlesden-Popper phase oxides such as Pr2NiO4+δ have been proposed as a promising alternative to conventional perovskite-structured materials for use as oxygen electrodes for Solid Oxide Cells (SOCs). However, it has been shown that Pr2NiO4+δ undergoes a structural evolution to a higher order phase Pr3Ni4O10±δ and PrOx under certain conditions and reacts with a Gd-dopped ceria (CGO) interlayer to form a Ce1-x-yGdxPryO2-δ (CGPO) phase.[1] Albeit the limited stability of Pr2NiO4+δ raises debate about its long-term electrochemical performance, the decomposition phases Pr3Ni4O10±δ and CGPO are potentially suitable candidates for electrode materials in SOCs.[2,3]
In this work, a solid solution of single-phase CGPO and composite phases of Pr2NiO4+δ and CGO have been prepared and investigated. The oxygen diffusion kinetics were studied via isotopic exchange Raman spectroscopy (IERS), an alternative to the well-established conventional approach using isotopic exchange depth profiling combined with secondary ion mass spectrometry (IEDP-SIMS). This novel isotopic exchange Raman spectroscopy methodology, based upon the Raman frequency shift due to the changes in isotope concentration, has been demonstrated as a powerful technique to study the oxygen diffusion and surface exchange kinetics in situ with unprecedented time resolution.[4] Moreover, due to the incorporation of rare earth elements, a negative frequency shift of the single Raman-allowed mode in pure CeO2 (F2g at ~464 cm-1) has been observed together with an increase in intensity of the bands, due to the formation of oxygen vacancies. Here, this technique was applied to Pr, and Gd-doped ceria bulk materials with a multidimensional analysis demonstrating its ability to study simultaneously the defect chemistry and the oxygen diffusion kinetics in CPGO bulk materials.
Z.S. wishes to thank funding from Horizon Europe under the program HORIZON-MSCA-2021-PF-01, project no.101064349 (NATFOX).
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.