A5084426798- Advanced Photocatalysis Techniques
- Electrocatalysts for Energy Conversion
- Gas Sensing Nanomaterials and Sensors
- Copper-based nanomaterials and applications
- Electronic and Structural Properties of Oxides
- Advanced battery technologies research
- Electrochemical Analysis and Applications
- ZnO doping and properties
- Perovskite Materials and Applications
- Transition Metal Oxide Nanomaterials
- TiO2 Photocatalysis and Solar Cells
- Catalytic Processes in Materials Science
- Quantum Dots Synthesis And Properties
- Semiconductor materials and devices
- Ammonia Synthesis and Nitrogen Reduction
- Conducting polymers and applications
- Water Quality Monitoring and Analysis
- Machine Learning in Materials Science
- Fuel Cells and Related Materials
- Nanowire Synthesis and Applications
- Caching and Content Delivery
- Semiconductor materials and interfaces
- Ga2O3 and related materials
- Advanced Nanomaterials in Catalysis
- Chalcogenide Semiconductor Thin Films
IMDEA Energy Institute
2022-2025
Madrid Institute for Advanced Studies
2022-2024
Universitat Jaume I
2018-2024
Luxembourg Institute of Science and Technology
2021
Universidad Complutense de Madrid
2016-2021
Ayuntamiento de Castellón de la Plana
2019-2021
Hospital General Universitari de Castelló
2019
Institute for Energy Technology
2017
Oxygen vacancies are ubiquitous in metal oxides and critical to performance, yet the impact of these states upon charge carrier dynamics important for photoelectrochemical photocatalytic applications remains contentious poorly understood. A key challenge is unambiguous identification spectroscopic fingerprints which can be used track their function. Herein, we employ five complementary techniques modulate electronic occupancy associated with oxygen situ BiVO4 photoanodes, allowing us...
Metal oxides and oxyhydroxides exhibit state-of-the-art activity for the oxygen evolution reaction (OER); however, their mechanism, particularly relationship between charging of oxide OER kinetics, remains elusive. Here, we investigate a series Mn-, Co-, Fe-, Zn-doped nickel using operando UV-vis spectroscopy coupled with time-resolved stepped potential spectroelectrochemistry. The Ni2+/Ni3+ redox peak is found to shift anodically from Mn- < Co- Fe- samples, suggesting decrease in binding...
Inspired by the outstanding optoelectronic properties reported for all-inorganic halide perovskite quantum dots (QDs), we have evaluated potential of these materials toward photocatalytic and photoelectrochemical degradation organic compounds, taking oxidation 2-mercaptobenzothiazole (MBT) as a proof-of-concept. First, determined electrochemically energy levels dispersions QDs with different band gaps induced ratios between halides (Br I) metallic cations (Pb Sn). Then, selected CsPbBr3 to...
Abstract Transition metal chalcogenides have been identified as low-cost and efficient electrocatalysts to promote the hydrogen evolution reaction in alkaline media. However, identification of active sites underlying catalytic mechanism remain elusive. In this work, we employ operando X-ray absorption spectroscopy near-ambient pressure photoelectron elucidate that NiS undergoes an in-situ phase transition intimately mixed Ni 3 S 2 NiO, generating highly synergistic dual at /NiO interface....
Unveiling the role of applied bias on charge carrier dynamics in WO<sub>3</sub>/BiVO<sub>4</sub> junction during water oxidation.
The present topical review aims to summarize the role of oxygen vacancies on four most studied semiconducting thin film oxides (BiVO<sub>4</sub>, Fe<sub>2</sub>O<sub>3</sub>, TiO<sub>2</sub> and WO<sub>3</sub>) as photoanodes for solar water splitting.
Russelite bismuth tungstate (Bi2WO6) has been widely reported for the photocatalytic degradation and mineralization of a myriad pollutants as well organic compounds. These materials present perovskite-like structure with hierarchical morphologies, which confers excellent optoelectronic properties potentials candidates solar fuels production. Here, we propose development Bi2WO6/TiO2 heterojunctions CO2 photoreduction, promising solution to produce fuels, alleviate global warming tackle fossil...
Realization of photo-electrochemical water splitting to generate H2 alternative fuel requires the facilitation kinetically-sluggish oxygen evolution reaction (OER) occurring at photoanode. To do so, there is a need develop new methods assemble suitable OER co-catalysts semiconductor–solution interface. Although Metal–Organic Frameworks (MOFs) are frequently used as precursor materials synthesize high surface area, effective electrocatalysts, until now their utilization in working cell (PEC)...
A major challenge for achieving the energy transition and transforming current model into distributed production is development of efficient artificial leaf devices made earth-abundant materials sustainable fuel production.
The present review gives an overview of the different state-of-the-art X-ray techniques employed for characterisation photoelectrocatalytic systems, focusing on possibilities studied techniques, cell designs and relevant results.
Oxygen-containing yttrium hydride thin films exhibit photochromic behavior: Transparent reversibly switch from a transparent state to photodarkened after being illuminated with UV or blue light. From optical spectrophotometry and ellipsometry measurements of the state, it is concluded that effect can be explained by gradual growth, under illumination, metallic domains within initial wide-band-gap semiconducting lattice. This conclusion supported Raman measurements.
Photoelectrochemical water splitting using semiconductor materials has emerged as a promising approach to produce hydrogen (H2) from renewable resources such sunlight and water. In the present study, Ag3PO4 nanoparticles were electrodeposited on BiVO4 photoanodes for splitting. A remarkable oxidation photocurrent of 2.3 mA·cm–2 at 1.23 V versus reversible electrode with ∼100% Faradaic efficiency was obtained, which constitutes notable increase compared pristine photoanode. It is demonstrated...
The present study proposes a laser irradiation method to superficially reduce BiVO4 photoelectrodes and boost their water oxidation reaction performance. origin of this enhanced performance toward oxygen evolution (OER) was studied using combination suite structural, chemical, mechanistic advanced characterization techniques including X-ray photoelectron (XPS), absorption spectroscopy (XAS), electrochemical impedance (EIS), transient (TAS), among others. We found that the reduction material...
The use of magnetic fields as external stimuli to improve the kinetics electrochemical reactions is attracting substantial attention, given their potential reduce energy losses. Despite recent reports showing a positive effect on catalytic performance upon applying field working electrode, there are still many uncertainties and lack experimental evidence correlating presence electrocatalytic performance. Here, we present combination spectroscopic tools that demonstrate how an alters reaction...
Herein, we report the cooperative effect of Zr doping and vacuum annealing on carrier dynamics interfacial kinetics anodized TiO2 nanotubes for light-driven water oxidation. After evaluation different loads conditions, it was found that both lead to a significantly enhanced light harvesting efficiency photoelectrochemical performance. The substitution Zr4+ by Ti4+ species leads higher density surface defects such as oxygen vacancies, facilitating electron trapping Zr4+, which reduced charge...
Nickel oxyhydroxide electrocatalysts are highly active for water oxidation and swell when electrochemically activated. In this thickness dependence study, we find only the upper surface (<5 nm) is during catalysis.
Abstract Light‐driven water splitting with metal oxide semiconductor materials to produce H 2 constitutes one of the most promising energy conversion technologies built on solar power. BiVO 4 stands out as attractive oxides reported photocurrents close its theoretical maximum 7.5 mA cm −2 at 1 sun illumination. The present work addresses state‐of‐the‐art strategies enhance performance this material for oxidation by heterostructuring different underlayer (SnO and WO 3 ) overlayer...
A novel ultrafast solution combustion method produces self-supported M-doped NiO-based OER electrocatalysts exhibiting improved performances with respect to benchmarks obtained by traditional methods. The overpotential at 10 mA cm<sup>−2</sup> and pH 13 was 190 mV.
In this study, we report an up-scalable and low-cost solution-processed method to in situ synthesize earth-abundant non-stoichiometric NiOx-based electrocatalytic film for water oxidation. The catalytic activity was found be inversely proportional the baking temperature, which varied from 50 500 °C. We formation of a hybrid nanocomposite thin NiOx nanocrystals (<2 nm size) inside acetate-based organic matrix at low temperatures (<200 °C). defective short-range structural order...
Cr doped SnO<sub>2</sub> microtubes have been fabricated by a thermal evaporation–deposition method.
ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTIntensity-Modulated Photocurrent Spectroscopy for Solar Energy Conversion Devices: What Does a Negative Value Mean?Drialys Cardenas-MorcosoDrialys Cardenas-MorcosoInstitute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, SpainMore by Drialys Cardenas-Morcoso, Agustín BouAgustín BouInstitute Bou, Sandheep RavishankarSandheep RavishankarInstitute Ravishankarhttp://orcid.org/0000-0002-8118-0159, Miguel García-TecedorMiguel...
Cr doped nanostructures in forms of wires, belts, zigzags, and boomerangs have been fabricated by a vapor–solid method using metallic Sn Cr2O3 as precursors. A concentration around 1 at. % has estimated the energy dispersive X-ray spectroscopy. The presence modifies morphology as-grown promoting lateral growths stepped features. doping induces slight changes Raman signal, enhancement 721 cm–1 mode associated with lattice disorder. luminescence SnO2 can be also modified doping. new emission...
Copper-based hydrogen evolution electrocatalysts are promising materials to scale-up production due their reported high current densities; however, electrode durability remains a challenge. Here, we report facile, cost-effective, and scalable synthetic route produce Cu2-xS electrocatalysts, exhibiting rates that increase for ∼1 month of operation. Our electrodes reach state-of-the-art performance ∼400 mA cm-2 at -1 V vs RHE under mild conditions (pH 8.6), with almost 100% Faradaic efficiency...