A5030504206- Magnetic and transport properties of perovskites and related materials
- Ferroelectric and Piezoelectric Materials
- Advancements in Battery Materials
- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Electronic and Structural Properties of Oxides
- Supercapacitor Materials and Fabrication
- Advanced Battery Materials and Technologies
- Dielectric properties of ceramics
- Electrocatalysts for Energy Conversion
- Catalysis for Biomass Conversion
- Extraction and Separation Processes
- Thermal Expansion and Ionic Conductivity
- Crystal Structures and Properties
- Magnetic Properties and Synthesis of Ferrites
- Advanced Thermoelectric Materials and Devices
- Catalytic Processes in Materials Science
- Chemical Synthesis and Characterization
- Catalysis and Oxidation Reactions
- Chalcogenide Semiconductor Thin Films
- Heusler alloys: electronic and magnetic properties
- Advanced battery technologies research
- Ammonia Synthesis and Nitrogen Reduction
- Mesoporous Materials and Catalysis
- Iron oxide chemistry and applications
Universidad Complutense de Madrid
2016-2025
Tulane University
2003
The growing demand of energy needs the search for alternative sources different to fossil fuels. use biomass as source is one most studied, because there are high value products that can be produced from biomass. One these γ-valerolactone, obtained furfural, which a derived product. To transform furfural into γ-valerolactone necessary bifunctional catalyst and hydrogen source. In this work, was using 2-propanol solvent donor on Zr supported sepiolite catalysts. It demonstrated sepiolite,...
ABSTRACT This study introduces a novel method for the effective doping of hexagonal molybdenum trioxide ( h‐ MoO 3 ) microstructures with different contents nickel, significantly enhancing its electrochemical performance in aluminum‐ion batteries (AIBs). Ni does not alter high crystallinity and phase purity pristine oxide but modifies defective structure electronic properties. Electrochemical tests, including cyclic voltammograms charge–discharge cycling, showed improvements capacity...
Abstract δ‐MnO 2 nanofibers, synthesized by using a simple, low‐cost sol‐gel method, showed high electrochemical performance as cathode for rechargeable Al‐ion batteries (AIBs). presented an initial discharge capacity of 59 mA h g −1 and stabilized at 37 current rate 100 after 15 cycles more than with almost 99 % coulombic efficiency. Different plateaus in charge/discharge curves, consistent CV peaks, revealed the insertion/deinsertion stability battery. Moreover, different measurements...
Abstract A set of multiphase manganese‐oxide composite materials (Mn 2 O 3 @Mn 4 and Mn 5 8 ), a birnessite‐type K x MnO oxide are prepared evaluated as cathodes for Zn‐ion batteries. The species formed when the electrodes subjected to V in aqueous solutions MnSO ZnSO analyzed, suggesting an interphase activation leading enhancement electrochemical response. For first time, it is shown that Zn (SO )(OH) 6 .xH phase coats composite‐type charging stage, contributing extending lifetime...
Abstract This study presents groundbreaking results in the field of rechargeable aluminium‐ion batteries, achieving stable capacities exceeding 300 mAh g −1 for more than cycles. The key to this achievement lies utilization tailor‐made carbon materials and a urea‐AlCl 3 ‐based electrolyte. article investigates optimal physicochemical properties active material necessary effective electrodes these batteries. investigation employs wide range characterization techniques (XRD, SEM‐EDX, N 2...
Iron oxides (FeOx) are non-toxic, non-expensive and environmentally friendly compounds, which makes them good candidates for many industrial applications, among catalysis. In the present article five catalysts based on FeOx were synthesized by mild routes: hydrothermal in subcritical supercritical conditions (Fe-HT, Few200, Few450) solvothermal (Fe-ST1 Fe-ST2). The catalytic activity of these was studied total oxidation toluene using very demanding with high space velocities including water...
KxMnO2 materials with birnessite-type structure are synthetized by two different methods which make it possible to obtain manganese oxides degrees of crystallinity. The XPS results indicate that the sample obtained at high temperature (KMn8) exhibits a lower oxidation state for ions as well denser morphology. Both characteristics could explain capacity value this electrode. In contrast, low (KMn4) or hydrothermal method presents close 4 and more porous Indeed, in case higher values obtained....
Perovskite-type cobaltites LaCo1−xTixO3 (0 ⩽ x 0.5) synthesized by the liquid mix technique were characterized x-ray diffraction, neutron XPS, magnetic susceptibility and magnetization versus field measurements. Structural symmetry changes from rhombohedral (S.G. ) for 0.05 0.20 to orthorhombic Pbnm) 0.25 0.40. The bond distances dependence on composition, x, has been analysed diffraction data. Both structural spectroscopic (from XPS) results suggest that Ti4+ substitution implies...
Polycrystalline Sr 2 MnTiO 6−δ (SMTO) nanosized powders have been prepared by the liquid mix technique. Thermogravimetric experiments show presence of small amounts (4%) Mn 3+ in sample. A systematic structural study shows stabilization nanocrystals about 50 nm, which crystallize an space group Pm 3 m , i.e. arystotype perovskite. Microstructural analysis permits us to interpret electrical and magnetic properties terms a high degree disorder including intergrowths. Although existence...
Spinel oxides with composition LiMn2-xMxO4 (M, a transition metal) are intensively studied due to their remarkable electrochemical properties. This study deals cathode materials based on the lithium iron manganese oxide LiFe0.5Mn1.5O4 synthesized by different methods (sol-gel, in solution and hydrothermal) order obtain samples various morphologies. SEM results show microspheres, composed of nanosized/submicrometer-sized subunits, microrods less porous surface, finally nanoparticles that form...
γ-Valerolactone (GVL) is a valuable chemical that can be used as clean additive for automotive fuels. This compound produced from biomass-derived compounds. Levulinic acid (LA) obtained easily biomass and it transformed into GVL by dehydration hydrogenation using metallic catalysts. In this work, catalysts of Ni (a non-noble metal) supported on series natural low-cost clay-materials have been tested in the transformation LA GVL. Catalysts were prepared modified wet impregnation method oxalic...
New iron-oxide-based anodes are prepared by an environmentally-friendly and low-cost route. The analysis of the composition, structure, microstructure samples reveals presence a major hematite phase, which is accompanied certain concentration oxyhydroxide can act as “lithium-reservoir”. By using sodium alginate binder, synthesized display superior electrochemical response, i.e., high specific capacity values stability, not only versus Li but also voltage cathode in full cell. From these bare...
A new series of [Fe3−xLnx]O4 nanoparticles, with Ln = Gd; Dy; Lu and x 0.05; 0.1; 0.15, was synthesized using the coprecipitation method. Analyses by X-ray diffraction (XRD), Rietveld refinement, high-resolution transmission electron microscopy (HRTEM) indicate that all phases crystallized in space group Fd3¯m, characteristic spinels. The XRD patterns, HRTEM, scanning analysis (SEM-EDS), Raman spectra showed single phases. Transmission (TEM), analysis, Scherrer’s calculations confirm these...
Abstract Novel materials and methods of synthesis in the field energy conversion economy are reported. The main goal is to prepare characterize Li (4 − x ) Mn (5 2 Fe 3 O 12 compounds. These compounds crystallize a spinel‐type structure, AB 4 , which cationic location A B sublattices drives potential application these two current prominent research fields: magnetic refrigeration lithium batteries. This solid solution revealed as tunable system that nicely permits specific response be...