Publication date: 10th April 2024
The surface exchange reaction is, while technologically relevant, poorly described for many mixed ionic-electronic conductors (MIECs). Due to the complex, multi-step nature of the exchange reaction, over the years there have been efforts to develop empirical correlations between the exchange reaction and properties that are easier to measure, calculate, or engineer. These include, concentrations of defects, diffusion coefficients, and the position of the conduction band, valance band or Fermi level. All suffer from the same limitations: they are based on bulk properties.
Given that the oxygen exchange reaction takes place on the outer surface, it is not surprising that the surface chemistry plays a significant role in the oxygen exchange rate. Intuitively, one might expect increases in the exchange rate to come from the addition of redox-active transition metal species, however, recently Nicollet et al. demonstrated that the surface exchange rate of Pr0.1Ce0.9O2 (PCO) could be altered by more than 5 orders of magnitude by the infiltration of nominally inert, isovalent binary oxides, and that the change in the exchange rate is correlated with the acidity of the infiltrated species.[1] Experimental work from Riedl et al. have confirmed these findings,[2] and an increasing body of work have shown that this correlation extends to multiple MIEC systems.
Attempts to provide a mechanistic explanation have primarily focused on the role of electron transfer between the modified surface and adsorbed oxygen species. In this work, based on experimental data from model MEICs systems and an analysis of literature, we present an alternative hypothesis, which considers, instead, the role of water species from the gas atmosphere.
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.