A5004973088- Electrocatalysts for Energy Conversion
- Electrochemical Analysis and Applications
- Molecular Junctions and Nanostructures
- Nonlinear Dynamics and Pattern Formation
- Advanced Photocatalysis Techniques
- Spectroscopy and Quantum Chemical Studies
- Fuel Cells and Related Materials
- Analytical Chemistry and Sensors
- Ammonia Synthesis and Nitrogen Reduction
- Ionic liquids properties and applications
- Electrodeposition and Electroless Coatings
- Catalytic Processes in Materials Science
- Hydrogen Storage and Materials
- Catalysis for Biomass Conversion
- Gas Sensing Nanomaterials and Sensors
- Free Radicals and Antioxidants
- Thermodynamic and Structural Properties of Metals and Alloys
- Copper-based nanomaterials and applications
- Supercapacitor Materials and Fabrication
- Iron oxide chemistry and applications
- Nuclear Materials and Properties
- Catalysis and Hydrodesulfurization Studies
- Quantum Dots Synthesis And Properties
- Nanomaterials for catalytic reactions
- Neural Networks and Applications
Universidade Federal de São Carlos
2013-2024
Universidade Estadual de Campinas (UNICAMP)
2018-2021
University of Alicante
2013-2015
Universidade de São Paulo
2005-2014
Instituto de Estudos Avançados da Universidade de São Paulo
2010
Abstract The hydrogen evolution and nitrite reduction reactions are key to producing green ammonia. Antenna–reactor nanoparticles hold promise improve the performances of these transformations under visible‐light excitation, by combining plasmonic catalytic materials. However, current materials involve compromising either on activity or enhancement also lack control reaction selectivity. Here, we demonstrate that ultralow loadings non‐uniform surface segregation component optimize...
Electrochemical systems are ideal working-horses for studying oscillatory dynamics. Experimentally obtained time series, however, usually associated with a spontaneous drift in some uncontrollable parameter that triggers transitions among different patterns, despite the fact all controllable parameters kept constant. Herein we present an empirical method to stabilize experimental potential series. The consists of applying negative galvanodynamic sweep compensate and was tested...
Despite the fact that majority of catalytic electro-oxidation small organic molecules presents oscillatory kinetics under certain conditions, there are few systematic studies concerning influence experimental parameters on dynamics. Of available, most devoted to C1 and just some scattered data available for C2 molecules. We present in this work a comprehensive study ethylene glycol polycrystalline platinum surfaces alkaline media. The system was studied by means electrochemical impedance...
By means of in situIR spectroscopy we investigate the effect dissolved alkali cations on electro-oxidation ethylene glycol platinum alkaline media. The results revealed that increase oxidation currents (Li+ < Na+ K+) is reflected ratio between carbonate and oxalate produced.
Plasmonic catalysis has been employed to enhance molecular transformations under visible light excitation, leveraging the localized surface plasmon resonance (LSPR) in plasmonic nanoparticles. While for accelerating reaction rates, achieving control over selectivity remained a challenge. In addition, incorporation of catalytic components into traditional plasmonic-catalytic antenna-reactor nanoparticles often leads decrease optical absorption. To address these issues, this study focuses on...
It is described in this paper the experimental observation of oscillatory dynamics during electrocatalytic oxidation methanol on platinum. Besides previously reported potential oscillations, current oscillations obtained under potentiostatic control are also presented. The existence region mapped an applied voltage x resistance bifurcation diagram. Conjointly with electrochemical investigations, situ FTIR spectroscopy was employed present studies. Although we were not able to follow eventual...
The problem of non-stationarity in experimentally recorded time-series is common many (electro)chemical systems. Underlying this the slow drift some uncontrollable parameter, and it occurs spite fact that all controllable parameters are kept constant. Particularly for electrochemical systems, us have recently suggested [J. Phys. Chem. C, 144, (2010), 22262-22268] an empirical method to stabilize experimental time-series. was exemplified electro-oxidation methanol different patterns were...
We report a comprehensive study of the electro-oxidation ethylene glycol (EG) on platinum with emphasis effects exerted by electrolyte pH, EG concentration, and temperature, under both regular oscillatory conditions. extracted discussed parameters such as voltammetric activity, reaction orders (with respect to [EG]), oscillation’s amplitude, frequency waveform, evolution mean electrode potential at six pH values from 0 14. In addition, we obtained apparent activation energies several...
We report the effect of alkali cation (Li+, Na+, and K+) on oscillatory electro-oxidation ethylene glycol in alkaline media. As experimentally verified, nature strongly impacts waveform frequency potential oscillations. The oscillation frequencies decrease order KOH > NaOH LiOH, which also corresponds to ascending surface blockage due noncovalent interactions. On other hand, estimated rate constant poison formation, kp, under regime is higher presence rather than NaOH, both acting as...
We studied the open circuit interaction of methanol and ethanol with oxidized platinum electrodes using in situ infrared spectroscopy. For methanol, it was found that formic acid is main species formed initial region transient steep decrease potential coincides an explosive increase CO2 production, which followed by coverage adsorbed CO. ethanol, acetaldehyde product detected only traces dissolved CO were after decay. In both cases, transients interpreted terms (a) emergence sub-surface...
Abstract The hydrogen evolution and nitrite reduction reactions are key to producing green ammonia. Antenna–reactor nanoparticles hold promise improve the performances of these transformations under visible‐light excitation, by combining plasmonic catalytic materials. However, current materials involve compromising either on activity or enhancement also lack control reaction selectivity. Here, we demonstrate that ultralow loadings non‐uniform surface segregation component optimize...
The interaction between organic molecules and oxidized catalyst surfaces has frequently been used to study the fuel crossover from anode cathode in direct liquid cells. In such experiments, surface is put contact with under open circuit conditions, evolution of potential registered. (OCP) vs. time features can then inform on reactivity provide valuable information not only applications cells but also electrochemical reform those produce clean hydrogen. this paper, we present an experimental...
The class of electrochemical oscillators characterized by a partially hidden negative differential resistance in an N-shaped current–potential curve encompasses myriad experimental examples. We present comprehensive methodological analysis the oscillation frequency this systems and discuss its dependence on electrical kinetic parameters. is developed from skeleton ordinary equation model, for obtained. Simulations are carried out model system, namely, nickel electrodissolution, numerical...