A5029621172- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Crystal Structures and Properties
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Semiconductor materials and interfaces
- High-pressure geophysics and materials
- Semiconductor Quantum Structures and Devices
- Copper-based nanomaterials and applications
- Semiconductor materials and devices
- Photonic Crystals and Applications
- Photoreceptor and optogenetics research
- Solid-state spectroscopy and crystallography
- Catalytic Processes in Materials Science
- Photosynthetic Processes and Mechanisms
- Spectroscopy and Quantum Chemical Studies
- X-ray Diffraction in Crystallography
- Silicon and Solar Cell Technologies
- Nuclear materials and radiation effects
- Nonlinear Optical Materials Studies
- Glass properties and applications
- Thermal Expansion and Ionic Conductivity
- Inorganic Fluorides and Related Compounds
- Electrocatalysts for Energy Conversion
- Gas Sensing Nanomaterials and Sensors
Institut Català d'Investigació Química
2021-2024
National University of Mar del Plata
2012-2021
Fundación Ciencias Exactas y Naturales
2013-2021
Consejo Nacional de Investigaciones Científicas y Técnicas
2017-2021
Instituto de Investigaciones Físicas de Mar del Plata
2017-2021
Leibniz University Hannover
2019-2021
Universidade Federal do ABC
2016
University of Parma
2000
Masmec (Italy)
1979-1985
The structuring of materials in the form photonic crystals for photocatalytic applications is a quite new strategy aiming to enhance performance photocatalysts at wavelength ranges where their absorption poor. It particular interest successfully manufacture an efficient system that could make use solar light. Thus, key "slow photon effect", occurring edges forbidden band photons. In this Perspective we have chosen some questions consider relevance and are well worth being addressed both...
Abstract Natural photosystems couple light harvesting to charge separation using a ‘special pair’ of chlorophyll molecules that accepts excitation energy from the antenna and initiates an electron-transfer cascade. To investigate photophysics special pairs independently complexities native photosynthetic proteins, as first step toward creating synthetic for new conversion technologies, we designed C 2 -symmetric proteins hold two in closely juxtaposed arrangements. X-ray crystallography...
The interaction of light with semiconducting materials becomes the center a wide range technologies, such as photocatalysis. This technology has recently attracted increasing attention due to its prospective uses in green energy and environmental remediation. characterization electronic structure semiconductors is essential deep understanding photocatalytic process since they influence govern activity by formation reactive radical species. Electron paramagnetic resonance (EPR) spectroscopy...
Zero-valent copper (Cu0) is a promising co-catalyst in semiconductor-based photocatalysis as it inexpensive and exhibits electronic properties similar to those of Ag Au. However, its practical application photocatalytic hydrogen production limited by susceptibility oxidation, forming less active Cu species. Herein, we have carried out situ encapsulation Cu0 nanoparticles with N-graphitic carbon layers (14.4% N) stabilize (N/C-coated Cu) improve the communication TiO2 photocatalyst. A facile...
Photocatalytic reforming of carboxylic acids on cocatalyst-loaded semiconductors is an attractive process for H2 generation that has been studied years. Experimental support the surface reaction mechanisms, nevertheless, still insufficient. Herein, mechanism photocatalytic conversion oxalic acid in anaerobic conditions together with total yields have deeply investigated by employing self-prepared TiO2 photocatalysts loaded different noble metals (Pt and/or Au). While evolution remarkably...
Heterogeneous photocatalysis has been widely considered, among other applications, for environmental remediation and hydrogen production. While these applications have traditionally seen as well-separated areas, recent examples highlighted the possibility of coupling them. Here, we demonstrate simultaneous production H2 naphthalene removal from aqueous solutions with (unoptimized) photonic efficiencies 0.97 0.33%, respectively, over Pt–TiO2 under simulated sunlight. Photocatalytic...
The bismuth 6s2 lone electron pair (LEP) in mullite-type Bi2M4O9/10 (where M = Al, Fe, or Mn) was characterized by means of several parameters derived from experimental and theoretical calculations. Wang-Liebau eccentricity (WLE) parameter proved to be very useful quantify the stereochemical activity LEPs.
We report on the structural characterization of mullite-type PbAl1-xMnxBO4 series using neutron, synchrotron and in-house X-ray powder diffraction, Raman spectroscopy density functional theory (DFT) calculations. The planar geometry BO3 group changes only slightly over whole composition range. rigid plays dominant roles in thermal contraction a-direction followed by expansion b- c-directions, leading to a correlation · b/c ~ unity. unit-cell volume at zero-pressure 0 K was obtained, as well...
The rich crystal chemistry of mullite-type Bi2M4O9 (M = Fe, Al, Ga) offers multiple potential applications. In particular, the strong absorption visible light shown by Bi2Fe4O9 has led to an influx research on its photocatalytic properties. However, most published studies involve decolorization dyes and take it as proof activity; furthermore, there are no reports conduction valence band edges, and, thus, actual redox characteristics photogenerated charge carriers have not been determined....
We report on strontium doped dibismuth-nonaoxoaluminate(III) produced at 1023 K. Partial substitution of bismuth by in the structure yields oxygen vacancies for charge balance. Introducing rearranged associated Al2O7 double-tetrahedra forming "Al3O10" tri-clusters which were identified multi-quantum 27Al MAS NMR. Both STEM-EDX and XPS showed homogeneous distribution bulk surface, respectively. Moreover, confirms valence state after doping. The orientations 6s2 lone electron pairs calculated...
In photosynthesis, pigment-protein complexes achieve outstanding photoinduced charge separation efficiencies through a set of strategies in which excited states delocalization over multiple pigments ("excitons") and charge-transfer play key roles. These concepts, their implementation bioinspired artificial systems, are attracting increasing attention due to the vast potential that could be tapped by realizing efficient photochemical reactions. particular, de novo designed proteins provide...
Abstract Screen‐printing is a commonly used method for the preparation of photoelectrodes. Although previous studies have explored effect number printed layers on efficiency dye‐sensitized solar cells, its interplay with photoelectrocatalytic properties electrodes has rarely been examined. This study focuses this issue by studying oxidation methanol over TiO 2 electrodes. Incident photon‐to‐current efficiencies reached 87 % at optimal conditions monochromatic (338 nm) irradiation one‐layer...
Energetically favorable local interactions can overcome the entropic cost of chain ordering and cause otherwise flexible polymers to adopt regularly repeating backbone conformations. A prominent example is α helix present in many protein structures, which stabilized by
Abstract The growth and Raman scattering results obtained for ZnGa 2 x In 2(1− ) S 4 , Zn Cd 1− Ga CdGa tetragonal pseudoternary compounds are given discussed. phonon spectra display one‐ two‐mode behaviour. For a virtual crystal model seems to describe the observed one‐mode
Undoped and In-doped CdS films have been grown by flash-evaporation at a substrate temperature between 150 200 °C. A resistivity of 5 Ω⋅cm has obtained for undoped °C while about 2.5×10−3 could be 1% any The transparency such wavelengths larger than that absorption edge is close to 100% when corrected the reflection loss. Due above characteristics these are suitable as windows in heterojunction solar cells.
We propose two new members of the mullite-type family, SnAlBO4 and SnGaBO4, carry out an in-depth study their crystal properties using hybrid method PW1PW. Both are isostructural to PbMBO4 (M = Fe, Mn, Al, Ga), which show axial negative linear compressibility (ANLC), among other interesting features. find that, although Sn2+ is susceptible being oxidized by oxygen, a suitable range experimental parameters exists in compounds could be synthesized. observe absence ANLC below 20 GPa explain it...
The phosphorus pressure in equilibrium with solid InP heated at temperatures of up to 980 °C was measured using a new-concept apparatus appositely designed and manufactured. With this apparatus, all the difficulties inherent handling vapor high were overcome without making use complicated devices such as quartz membranes or helix. This has allowed reproducible series measurements be made. found vary exponentially between 2 550 mbar temperature grows from 800 °C. results are practical...
Although titanium dioxide gathers many of the required properties for its application in photocatalytic processes, lack activity visible range is a major hurdle yet to be overcome. Among different strategies, post-synthesis modification TiO2 powders with organic compounds has already led commercially available materials, such as KRONOClean 7000. In this work, we apply diffuse reflectance transient absorption spectroscopy on visible-light active photocatalyst and study dynamics charge...