A5038490099- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Iron oxide chemistry and applications
- Mesoporous Materials and Catalysis
- TiO2 Photocatalysis and Solar Cells
- Electronic and Structural Properties of Oxides
- Adsorption and biosorption for pollutant removal
- Mine drainage and remediation techniques
- Silicone and Siloxane Chemistry
- Chemical Synthesis and Characterization
- biodegradable polymer synthesis and properties
- Extraction and Separation Processes
- Catalytic Processes in Materials Science
- Electrochemical sensors and biosensors
- Machine Learning in Materials Science
- Covalent Organic Framework Applications
- Perovskite Materials and Applications
- Chemistry Education and Research
- Advanced oxidation water treatment
- Chemistry and Chemical Engineering
- Pesticide and Herbicide Environmental Studies
- Synthesis and properties of polymers
- Nanomaterials for catalytic reactions
- Polyoxometalates: Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
Universidade Federal Fluminense
2021-2025
Sociedade Brasileira de Química
2023
Novem (Netherlands)
2023
Universidade de São Paulo
2019-2022
Universidade Federal de São Carlos
2022
Universidade do Estado do Rio de Janeiro
2021
University of California, Davis
2016-2020
Czech Academy of Sciences, Institute of Physics
2020
Universidade Estadual de Campinas (UNICAMP)
2008-2018
Surface photovoltage spectroscopy (SPS) is used to measure the photopotential across a Ru-SrTiO3:Rh/BiVO4 particle tandem overall water splitting photocatalyst. The synthesized from Ru-modified SrTiO3:Rh nanocrystals and BiVO4 microcrystals by electrostatic assembly followed thermal annealing. It splits into H2 O2 with an apparent quantum efficiency of 1.29% at 435 nm solar hydrogen conversion 0.028%. According SPS, develops above 2.20 eV, effective band gap tandem, reaches its maximal value...
The photovoltage onset reveals the energetics of donor states, while size and reversibility provide information on charge transfer dynamics dopants their ability to oxidize methanol.
TEACHING LABORATORIES.A new practical experiment involving silver and gold nanoparticle syntheses was introduced in an inorganic chemistry laboratory course for undergraduate students at the Institute of Chemistry, UNICAMP.The nanoparticles were synthesized by reduction nitrate tetrachloroauric acid with sodium borohydride citrate aqueous medium.Stabilities suspensions tested using several different reactants including chloride, polyvinylpyrrolidone, polyvinyl alcohol cistamine.Changes...
Abstract The efficiency of a nanostructure applied to photo‐electrocatalysis is fundamentally governed by the capability surface sustain reaction without occurrence electron trapping or recombination photogenerated holes. This Minireview summarizes latest progress in use cocatalysts on hematite electrodes and their application water splitting induced sunlight. major drawback hole diffusion through solid‐liquid interface addressed selection best cocatalyst for increasing an iron‐based...
Inorganic-organic hybrid mesoporous silicas have been considered some of the most effective matrices for adsorption potentially toxic species from aqueous and non-aqueous media. Among them, SBA-15 porous silica is superior due to its all-connected large pores associated with intrinsic high surface area this class materials. Herein, we take advantage pore volume form organic macrocycles containing basic centres inside mesopores potentialize metal ability waste water. The construction was...
Dye-sensitized solar cells (DSSCs) have emerged as a promising alternative in photovoltaic energy, owing to their efficiency, cost-effectiveness, and versatility. Sensitizers are crucial efficiently converting energy into electricity these systems. This review focuses on employing coumarins, class of aromatic organic compounds, sensitizers DSSCs. We address the synthesis photophysical electronic properties, application optimizing conversion efficiency explore molecular engineering strategies...
With <italic>in situ</italic> ESEM and GIWAXS we saw that the perovskite degradation passes through hexagonal polytypes is dependent on composition.
The energy conversion efficiency of tandem photocatalysts for the overall water splitting reaction (OWS) is currently limited by our understanding carrier separation and recombination in such systems. What effect solid–solid solid–liquid interfaces on dynamics, how do photovoltage catalytic activity depend light intensity? In order to address these issues, we report here intensity-dependent open circuit potential (OCP) measurements a core–shell made from bismuth vanadate (BiVO4)...
Semiconductor-based solar water splitting is a promising strategy for the production of fuels from clean and sustainable source, following global trend replacing fossil fuels. Herein, systematic study application single-phase pseudobrookite Fe2TiO5 nanoparticles as oxygen-evolving photocatalyst splitting, in suspended particle system, presented. A solvothermal route was employed synthesis with average diameter (34 ± 8) nm. The obtained orange powder absorbs broad portion spectrum (band gap...
Graphene quantum dots (GQDs) have emerged as a new group of quantum-confined semiconductors in recent years, with possible applications light absorbers, luminescent labels, electrocatalysts, and photoelectrodes for photoelectrochemical water splitting. However, their semiconductor characteristics, such the effective band gap, majority carrier type, photochemistry, are obscured by defects this material. Herein, we use surface photovoltage spectroscopy (SPS) combination measurements to...
Inorganic–organic cobalt phyllosilicate hybrids were synthesized by the sol–gel procedure under mild non-hydrothermal conditions with a silicon precursor, formed through individual reactions between silane 3-glycidoxypropyltriethoxysilane and aminoalcohols ethanol- or diethanolamine. These procedures generated talc-like phyllosilicates containing pendant organic chains nitrogen oxygen basic centres located in interlamellar region. For organofunctionalized lamellar structure obtained method...
Combining TiO<sub>2</sub> pillaring with the loading of NiO<sub>x</sub> co-catalyst can boost water splitting hydrogen production over K<sub>2</sub>Ti<sub>4</sub>O<sub>9</sub> 66 times.
An interesting practical experiment about the preparation of dye-sensitized solar cells (DSSC) using natural dyes were carried out by undergraduate students in chemistry course at UNICAMP .Natural extracted from blueberries (Vaccinium myrtillus L.), jabuticabas (Myrciaria cauliflora), raw and cooked beets (Beta vulgaris annattos (Bixa orellana which used to sensitize TiO 2 films that composed photoanode DSSC.A polymer electrolyte containing an iodide/triiodide redox couple was lieu use...
Novel nanostructured 2 : 1 hybrid cobalt and nickel phyllosilicates containing attached diethyl iminodiacetate moieties within the interlamellar spaces were synthesized using a mild non-hydrothermal sol–gel methodology. The organofunctionalization of these hybrids was achieved silylating agents formed by reaction 3-chloropropyltriethoxysilane or 3-iodopropyltrietoxysilane with iminodiacetate, whereas 3-iodopropyltriethoxysilane from NaI. degrees functionalization new materials are associated...