Química Inorgánica, Cristalografía y Mineralografía - (QICM): Envíos recientes
Mostrando ítems 21-40 de 456
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Recent progress in nanostructured electrodes for solid oxide fuel cells deposited by spray pyrolysis.
(Elsevier, 2021-07-21)Low-temperature solid oxide fuel cells (LT-SOFCs), operating below 650 ◦C, are attracting a great interest due to their long-term stability and potential application for stationary and portable power generation. Much ... -
A novel multilaminated composite cathode for solid oxide fuel cells.
(Elsevier, 2019-05-28)A novel electrode architecture consisting in alternating layers of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) and Ce0.9Gd0.1O1.95 (CGO) is prepared for the first time by spray-pyrolysis deposition and investigated as cathode material ... -
LSCF-CGO nanocomposite cathodes deposited in a single step by spraypyrolysis.
(Elsevier, 2018-01-01)La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.1O1.95 (LSCF-CGO) nanostructured cathodes with different LSCF-content are prepared in a single step by spray-pyrolysis deposition, simplifying notably the fabrication process compared ... -
Investigation of PO4 3- oxyanion-doping on the properties of CaFe0.4Ti0.6O3 d for potential application as symmetrical electrodes for SOFCs
(Elsevier, 2020)CaTi0.6-xFe0.4PxO3-d (0 x 0.075) perovskite series are investigated as potential symmetrical electrodes for SOFCs. Pure phase compounds with a cubic perovskite structure (s.g. Pm3m) are obtained for x 0.025, while ... -
Impact of the lanthanide size on the polymorphism and electrical properties of Ln5.4MoO11.1 (Ln = Nd, Sm and Gd)
(Elsevier, 2023)Mixed proton-electronic conductors are of great interest for high temperature electrochemical devices, such as hydrogen separation membranes. In this contribution, ceramics with composition Ln5.4MoO11.1 (Ln = Nd, Sm and ... -
Metal-Doping of La5.4MoO11.1 Proton Conductors: Impact on the Structure and Electrical Properties.
(American Chemical Society, 2018-10-03)La5.4MoO11.1 proton conductors with different metal doping (Ca2+, Sr2+, Ba2+, Ti4+, Zr4+, and Nb5+) have been prepared and structurally and electrically characterized. Different polymorphs are stabilized depending on ... -
Doping effects on the structure and electrical properties of La2Ce2O7 proton conductors.
(Elsevier, 2020-01-01)Recent studies have reported that the conductivity of La2Ce2O7 proton conductors is improved by aliovalent doping, despite the high concentration of oxygen vacancies in the pristine material. In this study, we provide ... -
Advanced quantitative synchrotron X-ray imaging of cement micro- and meso- structures
(UMA Editorial, 2023)La tesis se centra en la investigación relacionada con la producción y el comportamiento de varios tipos de cemento, particularmente el cemento Portland y los cementos belíticos, así como los cementos de aluminato cálcico. ... -
Perspectives on Cathodes for Protonic Ceramic Fuel Cells.
(MDPI, 2021-06-09)Protonic ceramic fuel cells (PCFCs) are promising electrochemical devices for the efficient and clean conversion of hydrogen and low hydrocarbons into electrical energy. Their intermediate operation temperature (500–800 ... -
Nanostructured BaCo0.4Fe0.4Zr0.1Y0.1O3- Cathodes with Di erent Microstructural Architectures
(MDPI, 2020-05-30)Lowering the operating temperature of solid oxide fuel cells (SOFCs) is crucial to make this technology commercially viable. In this context, the electrode e ciency at low temperatures could be greatly enhanced by ... -
Influence of Bi1.5Y0.5O3 Active Layer on the Performance of Nanostructured La0.8Sr0.2MnO3 Cathode.
(MDPI, 2020-09-01)The efficiency of solid oxide fuel cell cathodes can be improved by microstructural optimization and using active layers, such as doped bismuth oxides. In this work, Bi1.5Y0.5O3 (BYO) films are prepared by spray-pyrolysis ... -
Mix and measure - Combining in situ X-ray powder diffraction and microtomography for accurate hydrating cement studies.
(Elsevier, 2023-11-14)It is reported an innovative methodology based on in situ MoKα1 laboratory X-ray powder diffraction (LXRPD) and microtomography (μCT) avoiding any sample conditioning. The pastes are injected in 2.0 mm capillaries and the ... -
Activation of LC3 binders by C-S-H nucleation seeding with a new tailored admixture for low-carbon cements.
(Ernst & Sohn GmbH, 2023-12-06)The use of supplementary cementitious materials is currently the most favorable strategy for reducing CO2 emissions in cements. Limestone Calcined Clay Cements, LC3, are a type of cement that allows the reduction of CO2 ... -
Empleo conjunto de difracción de rayos X de polvo y microtomografía de laboratorio en la hidratación del cemento Portland.
(2023)Se trataron los aspectos más generales sobre la química del cemento, la ciencia del hormigón, el empleo de nuevos materiales más eco-eficientes en la preparación de nuevos sistemas cementantes, revalorización de residuos ... -
Materiales puzolánicos para bajar las emisiones de CO2: soluciones locales para un problema global.
(2023)In recent decades, the cement sector has been looking for solutions to reduce the carbon footprint, being one of the most promising strategies, the replacement of clinker with supplementary cementitious materials, SCMs. ... -
Application of zeolites for the production of biofuels and furans from hexose sugars in ethanol.
(Elsevier, 2023-10-24)The use of zeolites as catalysts in the transformation of glucose and 5-hydroxymethylfurfural (HMF) into 5-ethoxymethylfurfural (EMF) was evaluated. The behaviour of the catalysts could be explained by their morphology, ... -
Assessment of the stability of LTA zeolites under natural gas drying TSA conditions.
(Elsevier, 2023-10-17)The main features in cationic LTA zeolites that are likely to impact its potential hydrothermal stability are interconnected. The Al content and the compensating cation play an important role in the water adsorption but ... -
X-Ray Computed Tomography.
(2023)En esta ponencia se presenta una breve introducción a la técnica: Tomografía Computerizada de Rayos-X. Además, se presenta el tomógrafo ubicado en la Unidad de Difracción de Rayos-X y Tomografía Computerizada de los Servicios ... -
Electrocatalytic properties of spray-drying-synthesized cobalt or nickel phosphonate-derived materials.
(2023)As a class of coordination polymers (CPs), metal phosphonates (MPs) are constructed by coordination bonds connecting metal sites and phosphonate (RPO32−) ligands, where the metal sites are dispersed uniformly at the atomic ... -
The effect of mechanochemistry on the preparation of heterogeneous catalysts: Reduction of furfural to obtain furfuryl alcohol.
(2023)In this context, mechanochemistry is receiving increasing attention for the synthesis of many chemical compounds in the solid state, considered by IUPAC as one of the 10 methodologies to change the world.Mechanochemistry ...