A5063177962- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Chalcogenide Semiconductor Thin Films
- Supercapacitor Materials and Fabrication
- Quantum Dots Synthesis And Properties
- Electron and X-Ray Spectroscopy Techniques
- Advanced battery technologies research
- 2D Materials and Applications
- Conducting polymers and applications
- Advanced Battery Technologies Research
- Extraction and Separation Processes
- Polyoxometalates: Synthesis and Applications
- Inorganic Chemistry and Materials
- Electrocatalysts for Energy Conversion
- Advanced Electron Microscopy Techniques and Applications
- Semiconductor materials and interfaces
- Copper-based nanomaterials and applications
- Photonic Crystals and Applications
- Transition Metal Oxide Nanomaterials
- Catalytic Processes in Materials Science
- Nanocluster Synthesis and Applications
- Catalysis and Oxidation Reactions
- X-ray Diffraction in Crystallography
- Ga2O3 and related materials
- Advanced Photocatalysis Techniques
Institut de Ciència de Materials de Barcelona
2015-2024
Consejo Superior de Investigaciones Científicas
2014-2023
ALBA Synchrotron (Spain)
2021
Instituto de Ciencia de Materiales de Madrid
2008-2018
Universitat Autònoma de Barcelona
2017
Centre de Recerca Matemàtica
2013-2014
École Polytechnique Fédérale de Lausanne
2004-2008
Universidad Complutense de Madrid
2008
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
1998-2005
Technical University of Darmstadt
2002-2004
We use light to transform a colloidal solution of spherical silver nanoparticles into larger different shape. The particle size and shape can be controlled by choosing the wavelength(s) used drive photochemical growth. These findings suggest new way thinking about growth in show exciting possibility that as major control parameter metallic nanoparticle reactions.
The temperature dependence of the absorption and fluorescence spectra colloidal CdSe nanocrystals was compared for three different shapes (dots, rods, tetrapods) in range 4–300K. While shift maximum indicates little on shape, authors find that broadening emission spectrum behaves very differently dots indicating major differences mechanisms shapes. Tetrapods behave more similarly to dots, which suggests lowest exciton state is centered at core.
Development of high energy density hybrid electrode based on rGO–PMo<sub>12</sub> for all-solid state supercapacitors along with actual demonstration lighting thirty one LEDs (NEO).
Porous carbon has been widely used as an efficient host to encapsulate highly active molecular sulfur (S) in Li-S and Na-S batteries. However, for these sub-nanosized pores, it is a challenge provide fully accessible sodium ions with unobstructed channels during cycling, particularly high content. It well recognized that solid interphase full coverage over the designed architectures plays critical roles promoting rapid charge transfer stable conversion reactions batteries, whereas...
The discharge products of ether-based Li–O2 cells were grown directly on common carbon-coated TEM grids and observed by oxidation-state-sensitive full field transmission soft X-ray microscopy (TXM). acquired data have permitted to quantify localize with spatial resolution the distribution oxygen in these samples (i.e., lithium superoxide, peroxide, carbonates) appreciate several compositional, structural, morphological aspects. Most peroxide particles had a toroidal shape, often central hole...
Three-dimensionally ordered macroporous (3DOM) LiMn2O4 spinel was prepared by a colloidal templating process. An opal structure consisting of monodispersed poly[styrene-co-methacrilic acid] beads (380 nm in diameter) used as template. After infiltration Li and Mn nitrates, the assembly calcined air at temperatures between 500 700 °C. Chemical processes were studied means thermal analysis, X-ray diffraction (XRD), solid-state nuclear magnetic resonance (NMR). Morphological microstructural...
Femtosecond photoluminescence (PL) up-conversion studies in polychromatic mode and laser-power-dependence of the PL were carried out on colloidal solutions CdSe quantum dots with diameters ranging from $2.4\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}4\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. The main features spectra consist, addition to band-gap luminescence, three bands, one $120--130\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ another...
Highly performing N-doped carbon nanosheet/MnO 2 derived from bacterial cellulose in an aqueous Zn-ion battery show MnO dissolution/deposition mechanism.
Absorption and photoluminescence excitation (PLE) spectra have been recorded for colloidal CdSe quantum dots of different sizes. We find no significant deviation between the PLE absorption spectra, provided appropriate corrections sample treatment are made. This implies that there is intrinsic wavelength dependence luminescence yield, in line with ultrafast intraband relaxation processes reported literature. suggest a possible source deviations literature scattering produced by aggregates...
Carbon free-radicals are used as soluble redox mediators to catalyze ORR and enhance the discharge of Li–O<sub>2</sub> batteries.
Lithium-rich transition-metal-oxide cathodes are among the most promising materials for next generation lithium-ion-batteries because they operate at high voltages and deliver capacities. However, their cycle-life remains limited, individual roles of transition-metals still not fully understood. Using bulk-sensitive X-ray absorption emission spectroscopy on Li[Li0.2Ni0.16Mn0.56Co0.08]O2, we inspect behavior Mn, generally considered inert upon electrochemical process. During first charge Mn...
We report on the (sub)picosecond relaxation processes in PbSe quantum dots of different sizes, measured by a near-infrared photoluminescence upconversion technique. The early-time spectra are characterized emission from several low-lying excited states. direct measurement Huang-Rhys factors lowest states excludes strong electron-phonon coupling intraband relaxation. kinetics point to fast sequential cascade process between states, governed energy gaps and quasicontinuous valence-band structure.
We analyze in detail the relationship between pore size distribution and discharge capacity for cathodes ionic liquid-based Li/O2 batteries at room temperature (RT) 60 °C. used several porous carbons with similar composition apparent surface area but peaks different points of meso/macroporous region. The structure caused a significant influence on specific capacity. However, no obvious correlations or total volumes were observed. Carbons high mesopore predominant 20–40 nm exhibited highest...
A reactive inverse matrix assisted pulsed laser evaporation method was used for the fabrication of hybrid graphene-based electrodes supercapacitors.
The stabilization of the intermediates formed during oxygen reduction reaction and their efficient solubilization diffusion is a crucial issue that needs to be improved in nonaqueous lithium–oxygen batteries. By adding 0.1 M K+ (as KOTf salt) electrolyte, we have observed remarkable improvements rate capability discharge process. cation facilitates more homogeneous product deposition porous cathode. Instead, as evidenced by synchrotron measurements, find does not influence cell chemistry,...
Crystalline 2H-WS2 thin films were prepared by thermal decomposition of amorphous WS3 sputter-deposited onto a Ni layer. Structural, electrical, and photoelectrochemical properties investigated. Room temperature photoconductivity response shown to arise from the same interband transitions as in single crystals. The photocurrent spectra measured function wavelength revealed structure due excitonic transitions. Surface modification adsorption ethylenediaminetetraacetic acid was increase reduce...
In this work, different electrodes consisting of a layer nanostructured binderless carbon supported on stainless steel (SS) mesh have been developed and tested as cathodes for Li–air batteries. Inverse opal (IO) carbons were using poly(styrene-co-methacrylic acid) (PS-MAA) spheres sizes templates via resorcinol–formaldehyde sol–gel process. The resulting electrodes, which mechanically stable easy to manipulate, electrochemically at both 25 60 °C by galvanostatic cycling in an ionic...