A5034371715- Advanced Photocatalysis Techniques
- Polyoxometalates: Synthesis and Applications
- Electrocatalysts for Energy Conversion
- Advanced Nanomaterials in Catalysis
- TiO2 Photocatalysis and Solar Cells
- Chemical Synthesis and Reactions
- CO2 Reduction Techniques and Catalysts
- Copper-based nanomaterials and applications
- Iron oxide chemistry and applications
- Gas Sensing Nanomaterials and Sensors
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced battery technologies research
- Porphyrin and Phthalocyanine Chemistry
- Radical Photochemical Reactions
- Analytical Chemistry and Sensors
- Solar-Powered Water Purification Methods
- Sulfur-Based Synthesis Techniques
- Mine drainage and remediation techniques
- Catalytic Processes in Materials Science
- Metal-Catalyzed Oxygenation Mechanisms
- Microbial Fuel Cells and Bioremediation
- Ionic liquids properties and applications
- X-ray Diffraction in Crystallography
- Catalysts for Methane Reforming
- Advanced oxidation water treatment
University of Ferrara
2014-2024
Institut Català d'Investigació Química
2014-2017
University of Padua
2008-2014
Observatori de l'Ebre
2014
University of Rome Tor Vergata
2007-2008
Isostructural cubane-shaped catalysts [Co(III)(4)(μ-O)(4)(μ-CH(3)COO)(4)(p-NC(5)H(4)X)(4)], 1-X (X = H, Me, t-Bu, OMe, Br, COOMe, CN), enable water oxidation under dark and illuminated conditions, where the primary step of photoinduced electron transfer obeys to Hammett linear free energy relationship behavior. Ligand design catalyst optimization are instrumental for sustained O(2) productivity with quantum efficiency up 80% at λ > 400 nm, thus opening a new perspective in vitro molecular...
Abstract The functional core of oxygenic photosynthesis is in charge catalytic water oxidation by a multi‐redox Mn III /Mn IV manifold that evolves through five electronic states (S i , where =0–4). synthetic model system this cycle and its S 0 →S 4 intermediates the expected turning point for artificial photosynthesis. tetramanganese‐substituted tungstosilicate [Mn 3 O (CH COO) (A‐α‐SiW 9 34 )] 6− (Mn POM) offers an unprecedented mimicry natural reduced state; it features hybrid...
Photoinduced water oxidation to molecular oxygen takes place in systems made of [Ru(bpy)3]2+ (bpy = 2,2′-bipyridine) as the photosensitizer, [Co4O4(O2CMe)4(py)4] (py pyridine) catalyst and Na2S2O8 sacrificial electron acceptor. The photochemical quantum yield process reaches outstanding value 30% depends on pH concentration. Transient absorption spectroscopy experiments aimed clarify first events photocatalytic are also reported.
The tetraruthenium polyoxometalate [Ru4(μ-O)4(μ-OH)2(H2O)4(γ-SiW10O36)2]10- (1) behaves as a very efficient water oxidation catalyst in photocatalytic cycles using Ru(bpy)32+ sensitizer and persulfate sacrificial oxidant. Two interrelated issues relevant to this behavior have been examined detail: (i) the effects of ion pairing between polyanionic cationic sensitizer, (ii) kinetics hole transfer from oxidized catalyst. Complementary charge interactions aqueous solution leads an static...
Water oxidation catalysts: evolution of [Co4(H2O)2(α-PW9O34)2]10− to catalytically active species is assessed by laser flash photolysis in sacrificial photocatalytic cycles with Ru(bpy)32+ as a photosensitizer.
Better together: A novel hybrid N-heterocyclic carbene (NHC) palladium complex, integrating a totally inorganic and polyanionic decatungstate unit, has been synthesized following convergent strategy. The interplay of the Pd binding domains with scaffold is instrumental in accessing multi-turnover catalysis CC cross-coupling aromatic dehalogenation reactions under MW-assisted protocols (see scheme). Detailed facts importance to specialist readers are published as "Supporting Information"....
The AlIII-containing polyanions [AlIII4(H2O)10(β-XW9O33H)2]4− with X = AsIII (1) and SbIII (2) feature four aluminum(III) centers sandwiched by two trivacant (β-XW9O33) Keggin units, trigger peroxide catalysis as well substrate coordination via multiple Lewis acid site interactions.
Abstract The functional core of oxygenic photosynthesis is in charge catalytic water oxidation by a multi‐redox Mn III /Mn IV manifold that evolves through five electronic states (S i , where =0–4). synthetic model system this cycle and its S 0 →S 4 intermediates the expected turning point for artificial photosynthesis. tetramanganese‐substituted tungstosilicate [Mn 3 O (CH COO) (A‐α‐SiW 9 34 )] 6− (Mn POM) offers an unprecedented mimicry natural reduced state; it features hybrid...
We report an efficient molecular light-driven system to oxidize water oxygen and a kinetic analysis of the factors determining efficiency system. The comprises highly active catalyst ([RuIV(tda)(py)2(O)]), [RuII(bpy)(bpy-COOEt)2]2+ (RuP), as sensitizer Na2S2O8 sacrificial electron acceptor. This combination exhibits high quantum yield (25%) chemical (93%) for photodriven evolution from water. processes underlying this performance are identified using optical techniques, including transient...
Electrocatalytic reduction of CO2 recently emerged as a viable solution in view changing the common belief and considering carbon dioxide valuable reactant instead waste product. In this view, we herein propose one-step synthesis gold nanostructures different morphologies grown on fluorine-doped tin oxide electrodes by means pulsed-laser deposition. The resulting cathodes are able to produce syngas mixtures compositions at overpotentials low 0.31 V CO2-presaturated aqueous media. Insights...
Olefin epoxidation by [gamma-SiW10O36(PhPO)2]4- and H2O2 occurs in hydrophobic ionic liquids (ILs), with yields selectivity up to >99%. The catalytic IL phase is recyclable. Under MW irradiation the reaction 200 turnovers per minute. Simultaneous cooling instrumental for quantitative conversion.
The oxygen evolving catalyst [Ru4(μ-OH)2(μ-O)4(H2O)4(γ-SiW10O36)2]10− effects H2O2 dismutation at rates (k = 36.8 ± 1.4 M−1 s−1), one/two order of magnitude higher compared to related tetra-substituted Cu, Fe, Mn, Ni and even Co polyoxometalates, thus providing localised gas bursts power nano-propulsion composite materials.
Abstract Mastering the light‐induced four‐electron oxidation of water to molecular oxygen is a key step towards achievement overall splitting produce alternative solar fuels. In this work, we report two rugged pyrazolate‐based diruthenium complexes that efficiently catalyze visible‐light‐driven oxidation. These were fully characterized both in solid state (by X‐ray diffraction analysis) and solution (spectroscopically electrochemically). Benchmark performances for homogeneous production have...
One main difficulty for the technological development of photoelectrochemical (PEC) water splitting (WS) devices is fabrication active, stable and cost-effective photoelectrodes that ensure high performance. Here, we report a CuO/Silicon based photoanode, which shows an onset potential oxidation 0.53 V vs SCE at pH 9, is, overpotential 75 mV, stability above 10 h. These values account photovoltage 420 mV due to absorbed photons by silicon, as proven comparing with analogous CuO/FTO...
Abstract Organic–inorganic hybrids based on polyoxometalate scaffolds(POMs) are a unique class of molecular metal‐oxides featuring composite surface, whereby the merging complementary domains stimulates new functions and enhances performances. The interaction between organic inorganic components can be designed via covalent and/or non‐covalent strategies, yielding novel systems with key applications in catalysis materials science. Selected examples such rewarding approach will illustrated,...
Indium tin oxide (ITO) surfaces of triple junction photovoltaic cells were functionalized with oxygen evolving catalysts (OECs) based on amorphous hydrous earth-abundant metal oxides (metal = Fe, Ni, Co), obtained by straightforward Successive Ionic Layer Adsorption and Reaction (SILAR) in an aqueous environment. Functionalization Fe(iii) gave the best results, leading to photoanodes capable efficiently splitting water, photocurrent densities up 6 ± 1 mA cm(-2) at 0 V vs. reversible hydrogen...
Hematite photoelectrodes prepared via a hydrothermal route are functionalized with water oxidation catalyst consisting of amorphous Fe(III) oxide, obtained by successive ionic layer adsorption and reaction. The performances the catalyst-modified photoanodes considerably higher than those parent electrodes, resulting in nearly doubled photoanodic current all basic aqueous electrolytes explored this study. combination electrochemical impedance spectroscopy laser flash photolysis indicates that...
The deposition of perylene diimide-based aggregates (PDI) onto wide band gap n-type Sb-doped SnO2 (ATO) was investigated with the aim finding efficient and versatile dye-sensitized platforms for photoelectrochemical solar fuel generation. These ATO-PDI photoanodes displayed hydrolytic stability in a range pH (from 1 to 13) revealed superior performances (up mA/cm2 net photocurrent at V vs SCE) compared both WO3-PDI undoped SnO2-PDI when used setup HBr splitting. Although ATO, SnO2, WO3 are...
A novel pentacyclic quinoid photosensitizer with extended absorption in the visible region and enabling proton-coupled electron transfer is employed photoelectrodes for water oxidation combination a ruthenium polyoxometalate catalyst.
A hybrid photoanode, made of a multilayered heterostructured WO<sub>3</sub>/BiVO<sub>4</sub> semiconductor, carbon nanotube fibre and rugged highly active molecular water oxidation catalyst is described.
Three perfluorinated ZnII porphyrins were evaluated as n-type sensitizers in photoelectrosynthetic cells for HBr and water splitting. All the dyes are featured by presence of pentafluorophenyl electron-withdrawing groups to increase ground-state oxidation potential differ nature position π-conjugate linker between core anchoring group tasked bind metal oxide, order assess best way coupling with semiconductor. A phenyl-triazole moiety was used link carboxylic onto meso position, while an...
Hematite (α-Fe2O3) is an earth-abundant indirect n-type semiconductor displaying a band gap of about 2.2 eV, useful for collecting large fraction visible photons, with frontier energy levels suitably aligned carrying out the photoelectrochemical water oxidation reaction under basic conditions. The modification hematite mesoporous thin-film photoanodes Ti(IV), as well their functionalization oxygen-evolving catalyst, leads to 6-fold increase in photocurrent density respect unmodified...