Publication date: 15th December 2014
A new procedure for the electrodeposition of Ca-Mn oxides with OER activity was developed. The methodoloy combines electrolysis at 1.45 V vs NHE in a borate buffer with a backing procedure at 200 °C. The proportion of Ca incorporated into the film is controlled by the proportion of Ca in the electrodeposition solution. At an optimal concentration, Ca improves the catalytic properties of the oxide regarding water oxidation by increasing the exchange current density. The proportion of Ca affects also the Tafel slope of the films: the higher the Ca concentration the higher the Tafel slope. The films with highest Ca concentrations are found to be catalytically inactive. To understand the structural details of the electrodes, X-ray absorption spectroscopy (XAS) measurements were performed at the Ca and Mn K-edges. The EXAFS (extended X-ray absorption fine-structure) reveals a birnessite-type structure for all the MnCa oxides. The calcium is incorporated into the material forming, inter alia, Mn3CaO4 cubanes, as also found in the MnCa complex of biological photosynthesis. The activation of the films with the baking proccedure is explained by a decrease of the long-range order in the oxide structure that is coupled to creation of active sites for water oxidation catalysis.
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.