A5088570020- Advanced Photocatalysis Techniques
- Gas Sensing Nanomaterials and Sensors
- CO2 Reduction Techniques and Catalysts
- Copper-based nanomaterials and applications
- Electrocatalysts for Energy Conversion
- Transition Metal Oxide Nanomaterials
- Electronic and Structural Properties of Oxides
- Ionic liquids properties and applications
- Advanced battery technologies research
- Ga2O3 and related materials
- Catalytic Processes in Materials Science
- Luminescence and Fluorescent Materials
- Quantum Dots Synthesis And Properties
- ZnO doping and properties
- TiO2 Photocatalysis and Solar Cells
- Multiferroics and related materials
- Molecular Sensors and Ion Detection
- Magnetic and transport properties of perovskites and related materials
- Material Properties and Applications
- Oil, Gas, and Environmental Issues
- Carbon dioxide utilization in catalysis
- Pigment Synthesis and Properties
- Hydrogen Storage and Materials
- Maritime Transport Emissions and Efficiency
- Perovskite Materials and Applications
University of Milan
2015-2024
University of Toronto
2020-2024
Mylan (Switzerland)
2017
University of Bergamo
2012
Scientific Research Institute of the Rubber Industry
1981
National Institute of Chemistry
1981
Bismuth vanadate (BiVO4) with a band gap of ∼2.4 eV has emerged as one the visible photocatalysts that can absorb light below 520 nm. The electron/hole pairs are generated following BiVO4 excitation effective for water splitting, especially when is combined other metal oxides such WO3. We report solution processed method designing transparent WO3/BiVO4 heterojunction electrodes and observe synergistic effect on photoelectrochemical activity WO3/BiVO4, system performing dramatically better...
Direct electrolysis of pH-neutral seawater to generate hydrogen is an attractive approach for storing renewable energy. However, due the anodic competition between chlorine evolution and oxygen reaction (OER), direct splitting suffers from a low current density limited operating stability. Exploration catalysts enabling OER overpotential below hypochlorite formation (≈490 mV) critical suppress chloride facilitate splitting. Here, proton-adsorption-promoting strategy increase rate reported,...
Alkali hydroxide systems capture CO2 as carbonate; however, generating a pure stream requires significant energy input, typically from thermal cycling to 900°C. What is more, the subsequent valorization of gas-phase into products presents additional requirements and system complexities, including managing formation (bi)carbonate in an electrolyte separating unreacted downstream. Here, we report direct electrochemical conversion CO2, captured form carbonate, multicarbon (C2+) products. Using...
We report formate production via CO2 electroreduction at a Faradaic efficiency (FE) of 93% and partial current density 930 mA cm–2, an activity level potential industrial interest based on prior techno-economic analyses. devise catalyst synthesized using InP colloidal quantum dots (CQDs): the capping ligand exchange introduces surface sulfur, XPS reveals generation, operando, active exhibiting sulfur-protected oxidized indium metal. Surface metal sites adsorb reduce molecules, while sulfur...
Due to its ∼2.4 eV band gap, BiVO4 is a very promising photoanode material for harvesting the blue portion of solar light photoelectrochemical (PEC) water splitting applications. In WO3/BiVO4 heterojunction films, electrons photoexcited in are injected into WO3, overcoming lower charge carriers' diffusion properties limiting PEC performance photoanodes. Here, we investigate by ultrafast transient absorption spectroscopy carrier interactions occurring at interface between two oxides systems...
The dynamics of photopromoted electrons in BiVO4, WO3, and WO3/BiVO4 heterojunction electrodes has been directly probed by transient absorption (TA) midinfrared (mid-IR) spectroscopy the picosecond to microsecond time range. By comparison recorded with two individual oxides at 2050 cm–1 that system after excitation different wavelengths, electron-transfer processes between selectively excited BiVO4 WO3 have tracked for first time. These results support charge carrier interactions which were...
Mo 6+ doping increases the photoelectrochemical performance of BiVO 4 photoanodes in water oxidation. Herein, underlying mechanisms is elucidated through a systematic structural, morphological, and investigation on photoelectrodes pure doped prepared by novel multistep spin‐coating deposition approach, leading to multilayer flat films with high optical transparency. Transient absorption spectroscopy nano‐ microsecond time scale reveals longer lifetime photogenerated holes films. Besides...
The WO3/BiVO4 heterojunction is a promising photoanode architecture for water splitting applications. Here, the photoinduced charge carrier dynamics occurring in this system operando photoelectrochemical conditions, i.e., under an applied anodic potential, are studied through femtosecond transient absorption spectroscopy to unveil effects of bias on early following excitation. Electrochromic measurements BiVO4 suggest presence intraband gap (IBG) states oxide, which play important role...
Photoelectrochemical solar energy conversion offers a way to directly store light into energy-rich chemicals. Photoanodes based on the WO3/BiVO4 heterojunction are most effective mainly thanks efficient separation of photogenerated charges. The interfacial space region in is investigated here with increasing thickness BiVO4 layer over WO3 scaffold. On basis X-ray diffraction analysis results, density functional theory simulations show growth along {010} face, driven by formation stable...
CuWO4 is a ternary semiconductor oxide with excellent visible light harvesting properties up to 550 nm and stability at high pH values, which make it suitable material build photoanodes for solar conversion hydrogen via water splitting. In this work, we studied the photoelectrochemical (PEC) performance of transparent electrodes tunable absorption thickness, aiming identifying intrinsic bottlenecks photogenerated charge carriers in semiconductor. We found that optimal thickness exhibit...
Photoelectrochemical (PEC) water splitting converts solar light and into oxygen energy-rich hydrogen. WO3/BiVO4 heterojunction photoanodes perform much better than the separate oxide components, though internal charge recombination undermines their PEC performance when both oxides absorb light. Here we exploit BiVO4 layer to sensitize WO3 visible shield it from direct photoexcitation overcome this efficiency loss. experiments ultrafast transient absorption spectroscopy performed by frontside...
WO3/BiVO4 heterojunction photoanodes can be efficiently employed in photoelectrochemical (PEC) cells for the conversion of water into molecular oxygen, kinetic bottleneck splitting. Composite photoelectrodes possessing a nanoflake-like morphology have been synthesized through multistep process and their PEC performance was investigated comparison to that displaying planar surface similar absorption properties thickness. tests, also presence sacrificial hole scavenger, electrochemical...
Photoelectrodes with the WO3/BiVO4 heterojunction architecture are among most efficient semiconductor oxide-based photoanodes for water oxidation. However, because of different experimental conditions employed in their photoelectrochemical characterization (in particular nature and concentration contact electrolyte pH solution), a direct unambiguous comparison performance obtained laboratories is often quite difficult. In this work, we systematically tested identical solutions commonly used...
Abstract CuWO 4 has emerged in the last years as a ternary metal oxide material for photoanodes application photoelectrochemical cells, thanks to its relatively narrow band gap, high stability and selectivity toward oxygen evolution reaction, though largely limited by poor charge separation efficiency. Aiming at overcoming this limitation, we investigate here effects that Cu(II) ion substitution on photoelectrocatalytic (PEC) performance of copper tungstate. Optically transparent thin-film...
The PEC performance of WO3/BiVO4 heterojunction photoanodes with a fixed BiVO4 thick top layer and different WO3 thicknesses was investigated under backside irradiation, in comparison the same electrodes without layer. While these latter increase increasing thickness, presence layer, besides leading to an effective sensitization up 520 nm, leads decrease incident photon current efficiency short wavelength's range. After having excluded major filter effects, this has been attributed charge...
The need for stable oxide-based semiconductors with a narrow band gap, able to maximize the exploitation of visible light portion solar spectrum, is challenging issue photoelectrocatalytic (PEC) applications. In present work, CuW1–xMoxO4 (Eg = 2.0 eV x 0.5), which exhibits significantly reduced optical gap Eg compared isostructural CuWO4 2.3 eV), was investigated as photoactive material preparation photoanodes. CuW0.5Mo0.5O4 electrodes different thicknesses (80–530 nm), prepared by simple...