A5034636961- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- Fuel Cells and Related Materials
- Ionic liquids properties and applications
- Advanced battery technologies research
- nanoparticles nucleation surface interactions
- Electrochemical Analysis and Applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Advancements in Solid Oxide Fuel Cells
- Advanced Materials Characterization Techniques
- X-ray Diffraction in Crystallography
- Gold and Silver Nanoparticles Synthesis and Applications
- High Entropy Alloys Studies
- Mesoporous Materials and Catalysis
- CO2 Reduction Techniques and Catalysts
- Nanomaterials for catalytic reactions
- Nanocluster Synthesis and Applications
- Laser-Ablation Synthesis of Nanoparticles
- Crystallization and Solubility Studies
- Electron and X-Ray Spectroscopy Techniques
- Nanoparticles: synthesis and applications
- Iron oxide chemistry and applications
- Advanced Electron Microscopy Techniques and Applications
- Phase Equilibria and Thermodynamics
Institut Català de Nanociència i Nanotecnologia
2023-2025
Max-Planck-Institut für Nachhaltige Materialien
2017-2023
CERCA Institution
2023
Hochschule Düsseldorf University of Applied Sciences
2020
Max Planck Society
2017-2019
Universitat Autònoma de Barcelona
2015-2018
Institut de Ciència de Materials de Barcelona
2015-2018
Abstract In the endeavor of discovering new noble metal–free electrocatalysts for oxygen reduction reaction, multinary transition metal nanoparticle libraries are investigated. The complexity such multiple principal element alloys provides access to a large variety different elemental compositions, each with potentially unique properties. strategy efficient identification novel electrocatalytically active systems comprises combinatorial co‐sputtering into an ionic liquid followed by...
Complex solid solution (CSS) nanoparticles were recently discovered as efficient electrocatalysts for a variety of reactions. As one many advantages, they exhibit the potential to replace noble-metal catalysts with multinary combinations transition metals because offer formation new unique and tailorable active sites multiple elements located next each other. This Perspective reports on current state challenges (combinatorial) synthesis advanced electron microscopy characterization...
The oxygen evolution reaction is the bottleneck to energy-efficient water-based electrolysis for production of hydrogen and other solar fuels. In proton exchange membrane water (PEMWE), precious metals have generally been necessary stable catalysis this reaction. work, we report that delamination cobalt tungstate enables high activity durability through stabilization oxide water-hydroxide networks lattice defects in acid. resulting catalysts achieve lower overpotentials, a current density...
An AB2X4 spinel structure, with tetrahedral A and octahedral B sites, is a paradigmatic class of catalysts several possible geometric configurations numerous applications, including polysulfide conversion in metal–sulfur batteries. Nonetheless, the influence configuration composition on mechanisms catalysis precise manner which facilitate polysulfides remain unknown. To enable controlled exposure single active configurations, herein, Cotd2+ Cooh3+ Co3O4 for sodium are large part replaced by...
Abstract Copper indium gallium diselenide-based technology provides the most efficient solar energy conversion among all thin-film photovoltaic devices. This is possible due to engineered depth gradients and alkali extrinsic doping. Sodium well known impede interdiffusion of in polycrystalline Cu(In,Ga)Se 2 films, thus influencing distribution. Here, however, sodium shown have opposite effect monocrystalline gallium-free CuInSe grown on GaAs substrates. Gallium in-diffusion from substrates...
Electrochemical dealloying is presented as a versatile tool to fine-tune the properties and activity of electrocatalysts.
Ni-Xides (X = B, P, or S) exhibit intriguing properties that have endeared them for electrocatalytic water splitting. However, the role of and S, among others, in tailoring catalytic performance remains vaguely understood, especially if they are studied unpurified KOH (Un-KOH) because renowned impact incidental Fe impurities. Therefore, decoupling effect induced by impurities from inherent material reconstruction processes necessitates investigation materials purified solutions (P-KOH)....
Abstract High kinetic inductance superconductors are gaining increasing interest for the realisation of qubits, amplifiers and detectors. Moreover, thanks to their high impedance, quantum buses made such materials enable large zero-point fluctuations voltage, boosting coupling rates spin charge qubits. However, fully exploiting potential disordered or granular is challenging, as and, therefore, impedance at values difficult control. Here, we report a reproducible fabrication aluminium...
Controlling the amorphous or crystalline state of multinary Cr-Mn-Fe-Co-Ni alloy nanoparticles with sizes in range between ~1.7 nm and ~4.8 is achieved using three processing routes. Direct current sputtering from an target ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide leads to as observed by high-resolution transmission electron microscopy. Crystalline can be situ a microscope exposure beam, ex heating vacuum, directly during synthesis high-power impulse...
Focused-ion beam lift-out and annular milling is the most common method used for obtaining site specific specimens atom probe tomography (APT) experiments transmission electron microscopy. However, one of main limitations this technique comes from structural damage as well chemical degradation caused by high-energy ions. These aspects are especially critical in highly-sensitive specimens. In regard, ion under cryogenic conditions has been an established mitigation. Here, we implement a...
Complex solid solution electrocatalysts (often called high-entropy alloys) present a new catalyst class with highly promising features due to the interplay of multi-element active sites. One hurdle is limited knowledge about structure-activity correlations needed for targeted design. We prepared Cr-Mn-Fe-Co-Ni nanoparticles by magnetron sputtering high entropy Cantor alloy target simultaneously into an ionic liquid library. The synthesized have narrow size distribution but different sizes...
Rhodium-platinum core-shell nanoparticles on a carbon support (Rh@Pt/C NPs) are promising candidates as anode catalysts for polymer electrolyte membrane fuel cells. However, their electrochemical stability needs to be further explored successful application in commercial Here we employ identical location scanning transmission electron microscopy track the morphological and compositional changes of Rh@Pt/C NPs during potential cycling (10 000 cycles, 0.06-0.8 VRHE, 0.5 H2SO4) down atomic...
Cerium oxide (IV) nanoparticles offer a high redox ability, while maintaining nontoxicity and stability. Thus, dispersed nanoceria is promising candidate as antioxidant material for human cells. In this work, we report on fast simple one-pot process that yield final nanoparticle size of 2-4 nm in polar solvents such water alcohols. High boiling point solvents, namely, benzyl alcohol triethylene glycol, are used to obtain crystalline by thermal microwave activation. Transmission electron...
Bottom-up and top-down approaches are described for the challenging synthesis of Fe/Al nanoparticles (NPs) in ionic liquids (ILs) under mild conditions. The crystalline phase morphology metal synthesized three different were identified by powder X-ray diffractometry (PXRD), photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), selected-area diffraction (SAED) fast Fourier transform (FFT) high-resolution TEM images. Characterization was completed scanning with energy...
Binary alloy nanoparticles were fabricated by two combinatorial methods: (I) cosputtering from elemental targets into the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [Bmim][(Tf)2N] and (II) mixing after sputtering them separately [Bmim][(Tf)2N]. Both methods lead to formation of Au–Cu (2.3 nm for cosputtered, 3.6 mixed), however with different resulting compositions: cosputtered show a composition range Au80–90Cu20–10; Au- Cu-loaded liquids leads Au75Cu25...
Ru@Pt core-shell nanoparticles are currently being explored as carbon monoxide tolerant anode catalysts for proton exchange membrane fuel cells. However, little is known about their degradation under cell conditions. In the present work, two types of with nominal shell thicknesses 1 (Ru@1Pt) and 2 (Ru@2Pt) Pt monolayers studied synthesized after accelerated stress tests. These tests were designed to imitate occurring operating Our advanced (scanning) transmission electron microscopy...
Highlights•Mechanochemical synthesis is an efficient method for catalyst preparation•NiRu/CeO2 has proven to be a highly active NH3 decomposition•The high activity attributed number of vacancies in CeO2 structureSummaryDeveloping and stable catalysts carbon-free hydrogen production crucial mitigate the effects climate change. Ammonia promising source, as it content liquid at low pressure, which allows its easy storage transportation. We have recently developed nickel-based with small...