Publication date: 10th April 2024
In this study, La0.9Sr0.1MO3-δ (M=Al, Ga, In, and Yb) was used for interfacial observations of material dehydration and hydration processes using XPS and FTIR. The goal was to understand the hydration behavior at the gas/solid interface of La-based perovskites for oxygen ion conductors La0.9Sr0.1MO3-δ (M = Al and Ga) and hydrogen ions La0.9Sr0.1MO3-δ (M = In and Yb). After the dehydration process, humidification treatments were performed under an N2 atmosphere to observe whether conductivity recovered and to elucidate the relationship between conductivity and treatment.
From the conductivity results, it can be observed that the ionic conductivity of La0.9Sr0.1MO3-δ (M = Al and Ga) did not show significant changes under humidification treatment at 600 °C. Conversely, the ionic conductivity of La0.9Sr0.1MO3-δ (M = In and Yb) increased to a plateau with humidification treatment, after which there was no further increase within 10 h.
From the XPS O1s results, it is observed that the O1- fraction decreased for all materials due to dehydration. However, for La0.9Sr0.1MO3-δ (M = In and Yb), the O1- fraction increased after humidification treatment due to hydration reactions. This indicates that the ionic conductivity of proton conductors increased significantly due to the pronounced hydration reactions at the interface. In the case of for La0.9Sr0.1AlO3-δ, there is only a slight increase in O1- after humidification treatment, which is consistent with the conductivity results. The FTIR OH- results also show a similar trend to the changes observed in XPS O1-.
The results of this study indicate that the surface of proton conductors facilitated hydration reactions, thereby increasing the concentration of protons and improving the conductivity of the materials. However, although protons were observed in oxygen ion conductor materials, their lattice size was difficult for proton hopping and the interface was not favorable for hydration reactions [1]. Therefore, the ion conductivity of these materials did not show significant changes.
This study was supported by the National Science and Technology Council of Taiwan [Grant No. 112-2221-E-027 -028 –and 112-2622-E-027 -013 -].
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.