Una nueva arquitectura para la Red de Bibliotecas del CSIC

En esta ponencia, después de un breve repaso al proceso de automatización de las Bibliotecas del CSIC y al desarrollo de la Red de Bibliotecas, se exponen y analizan una serie de cambios importantes que van a tener lugar a medio plazo en la arquitectura de la Red. Por una parte, el paso de una arquitectura distribuida, con cuatro nodos zonales, a una arquitectura centralizada en un solo nodo, y por otra, la introducción de una nueva versión del programa de automatización Aleph, con una estructura y filosofía de funcionamiento totalmente nuevas respecto a la versión actual

Analysis of TihxOy Films Produced by Physical Vapor Deposition Method

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Surface oxide on thin films of yttrium hydride studied by neutron reflectometry

The applicability of standard methods for compositional analysis is limited for H-containing films. Neutron reflectometry is a powerful, non-destructive method that is especially suitable for these systems due to the large negative scattering length of H. In this work we demonstrate how neutron reflectometry can be used to investigate thin films of yttrium hydride. Neutron reflectometry gives a strong contrast between the film and the surface oxide layer, enabling us to estimate the oxide thickness and oxygen penetration depths. A surface oxide layer of 5-10 nm thickness was found for unprotected yttrium hydride films

Plasmonic hot-electron assisted phase transformation in 2D-MoS2 for the hydrogen evolution reaction: current status and future prospects

Layered two-dimensional (2D) transition metal dichalcogenides (TMDs) offer unique opportunities as sustainable energy materials owing to their high surface area per unit volume arising from the atomically thin architectures, chemically tunable in-plane electrical conductivity, electrocatalytic activities, absorption coefficient, and high stability. Physicochemical modifications of these layered TMDs with plasmonic nanostructures further enhance their optoelectronic and photoelectrochemical properties to saturation limits. This article provides a comprehensive overview of the structural and electrocatalytic properties of layered 2D molybdenum disulfides (MoS2) with and without plasmonic nanostructure modification for their application as an electrode for electrocatalytic hydrogen production via the hydrogen evolution reaction (HER). The 2H-phase of 2D-MoS2 has limited active electrocatalytic sites and low electron conductivity; however, it can be phase transformed into a 1T phase with a larger number of surface catalytic sites and higher metallic conductivity. The structure and properties of the two phases of 2D-MoS2, their synthesis, mechanisms, and characteristics of phase transitions with or without plasmonic nanostructures are thoroughly discussed for their application as an electrocatalyst for the HER. Plasmonic hot electron-assisted 2H to 1T phase transformation in 2D-MoS2 provides enormous opportunities in producing hydrogen efficiently via water splitting. This article also discusses further initiatives required to develop 2D-MoS2 as a large-scale electrocatalyst for hydrogen production

Editorial: Topical issue "Nanomaterials for energy- and environment-related applications"

© Elsevier Ltd. Available online 26 May 2020. Symposium on Metal Oxide-and Oxyhydride-Based Nanomaterials for Energy and Environment-Related Applications of the E-MRS (2019. Varsovia)Depto. de Física de MaterialesFac. de Ciencias FísicasTRUEpu

Investigation of biphenyl enamines for applications as p-type semiconductors

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Visible-Light-Active Black TiO2 Nanoparticles with Efficient Photocatalytic Performance for Degradation of Pharmaceuticals

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Enhanced hydrophobicity of CeO2 thin films: Role of the morphology, adsorbed species and crystallography

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Scaling up Studies on PEMFC Using a Modified Serpentine Flow Field Incorporating Porous Sponge Inserts to Observe Water Molecules

Flooding of the cathode flow channel is a major hindrance in achieving maximum performance from Proton Exchange Membrane Fuel Cells (PEMFC) during the scaling up process. Water accumulated between the interface region of Gas Diffusion Layer (GDL) and rib of the cathode flow field can be removed by the use of Porous Sponge Inserts (PSI) on the ribs. In the present work, the experimental investigations are carried out on PEMFC for the various reaction areas, namely 25, 50 and 100 cm2. Stoichiometry value of 2 is maintained for all experiments to avoid variations in power density obtained due to differences in fuel utilization. The experiments include two flow fields, namely Serpentine Flow Field (SFF) and Modified Serpentine with Staggered provisions of 4 mm PSI (4 mm × 2 mm × 2 mm) Flow Field (MSSFF). The peak power densities obtained on MSSFF are 0.420 W/cm2, 0.298 W/cm2 and 0.232 W/cm2 compared to SFF which yields 0.242 W/cm2, 0.213 W/cm2 and 0.171 W/cm2 for reaction areas of 25, 50 and 100 cm2 respectively. Further, the reliability of experimental results is verified for SFF and MSSFF on 25 cm2 PEMFC by using Electrochemical Impedance Spectroscopy (EIS). The use of 4 mm PSI is found to improve the performance of PEMFC through the better water management

Understanding the effects of Cr doping in rutile TiO₂ by DFT calculations and X-ray spectroscopy

The effects of Cr on local environment and electronic structure of rutile TiO₂ are studied combining theoretical and experimental approaches. Neutral and negatively charged substitutional Cr impurities Cr_(Ti)(0)* and Cr_(Ti)(-1)* as well as Cr-oxygen vacancy complex 2Cr_(Ti) + V₀ are studied by the density functional theory (DFT) within the generalized gradient approximation (GGA) of Perdew-Burke-Ernzerhof (PBE) functional. Experimental results based on X-Ray absorption spectroscopy (XAS) and X-Ray photoelectron spectroscopy (XPS) performed on Cr doped TiO₂ at the Synchrotron facility were compared to the theoretical results. It is shown that the electrons of the oxygen vacancy tend to be localized at the t_(2g) states of the Cr ions in order to reach the stable oxidation state of Cr(3+)*. Effects of Cr on crystal field (CF) and structural distortions in the rutile TiO₂ cell were analyzed by the DFT calculations and XAS spectra revealing that the CF and tetragonal distortions in TiO₂ are very sensitive to the concentration of Cr