A5055511531- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Electrocatalysts for Energy Conversion
- Electron and X-Ray Spectroscopy Techniques
- Crystallography and molecular interactions
- CO2 Reduction Techniques and Catalysts
- Catalytic Processes in Materials Science
- Advanced Electron Microscopy Techniques and Applications
- Advanced Materials Characterization Techniques
- Supercapacitor Materials and Fabrication
- Electrochemical Analysis and Applications
- Machine Learning in Materials Science
- Fuel Cells and Related Materials
- Anodic Oxide Films and Nanostructures
- Hydrogen embrittlement and corrosion behaviors in metals
- Innovative Microfluidic and Catalytic Techniques Innovation
- Advanced battery technologies research
- Biosensors and Analytical Detection
- Microfluidic and Capillary Electrophoresis Applications
- Magnetic Properties and Synthesis of Ferrites
- Spectroscopy and Quantum Chemical Studies
- Advanced X-ray Imaging Techniques
- nanoparticles nucleation surface interactions
- Synthesis of Tetrazole Derivatives
- Chemistry Education and Research
Universidade Estadual de Campinas (UNICAMP)
2017-2025
Herein we investigate the effect of irreversibly adsorbed bismuth on polycrystalline platinum (Ptp) electrooxidation glycerol in alkaline media by combining electrochemical, spectroscopic (in situ FTIR), and analytical (HPLC line) techniques. We found that activity Ptp increases about 5-fold when optimal quantity Bi ions is added to solution. Besides, adatom strongly impacts reaction products suppressing pathways with C–C bond breaking, hindering formation CO (and other unknown...
Herein we investigated the effect of adsorption Bi and Pb on polycrystalline platinum (Ptp) electrooxidation glycerol (EOG) in alkaline media by combining electrochemical, spectroscopic (in situ FTIR), analytical (online HPLC) techniques. Besides, used single crystal Pt electrodes to understand modification Ptp terms atomic arrangements its surface. We found that activity increases presence (Ptp–Pb), which acts suppressing pathways with complete C—C bond breaking (to produce carbonate)...
Electrocatalysis is at the heart of a broad range physicochemical applications that play an important role in present and future sustainable economy. Among myriad different electrocatalysts used this field, nanomaterials are ubiquitous importance. An increased surface area/volume ratio compared to bulk makes nanoscale catalysts preferred choice perform electrocatalytic reactions. Bragg coherent diffraction imaging (BCDI) was introduced 2006 since has been applied obtain 3D images crystalline...
The cost-effective production of green hydrogen is one the most important challenges for a sustainable energy transition. To decrease cost through electrolysis, there are several obstacles that must be overcome. For instance, more active and stable anodes made abundant cheap materials will contribute to lowering capital operational expenditure. It well known oxidation water requires high overpotentials, which main limitation performance device. In this context, substituting [oxygen evolution...
Abstract An improved understanding of catalyst dynamics for the oxygen evolution reaction (OER) in acid is critical informing development highly efficient, stable, and cost‐effective OER catalysts proton exchange membrane water electrolysis applications. Herein tunable, active, dynamic Ir 5+ materials are studied, Ln 3 IrO 7 (Ln = Pr, Nd, Sm, Eu). Leveraging a combination situ ex characterization, as well an advanced mercury underpotential deposition technique surface site quantification,...
The activity of Pt for the electro-oxidation several organic molecules changes with cation electrolyte. It has been proposed that underlying reason behind effect is so-called noncovalent interactions between hydrated cations and adsorbed OH (OH
Real (electro)catalysts are often heterogeneous, and their activity selectivity depend on the properties of specific active sites. Therefore, unveiling so-called structure-activity relationship is essential for a rational search better materials and, consequently, development field (electro-)catalysis. Thus, spatially resolved techniques powerful tools as they allow us to characterize and/or measure different regions heterogeneous catalysts. To take full advantage that, we have developed...
Abstract Shedding synchrotron light on microfluidic systems, exploring several contrasts in situ / operando at the nanoscale, like X-ray fluorescence, diffraction, luminescence, and absorption, has potential to reveal new properties functionalities of materials across diverse areas, such as green energy, photonics, nanomedicine. In this work, we present micro-fabrication characterization a multifunctional polyester/glass sealed device well-suited combine with analytical techniques. The...
Most electrochemical processes occur in the electrode-solution interface, thus, understanding structure and dynamic of electric double layer is mandatory for development field its related technologies. Herein, we present an apparatus <i>in situ </i>ultrafast dynamics low-frequency stimulated Raman spectroscopy measurements interface by time-resolved optical Kerr effect spectroscopy. We give details laser system, spectroelectrochemcial cell, calibration integrated setup. studied as a function...
Real (electro-)catalysts are often heterogeneous, and their activity selectivity depend on the properties of specific active sites. Therefore, unveiling so-called structure-activity relationship is essential for a rational search better materials and, consequently, development field (electro-)catalysts. Thus, spatially resolved techniques powerful tools as they allow us to characterize and/or measure different regions heterogeneous catalysts. To take full advantage that, we have developed...
Electrochemistry plays a crucial role in addressing energy transition challenges, with synchrotron radiation (SR) significantly enhancing the understanding of electrochemical systems. SR's importance has grown advent fourth-generation facilities, which offer specialized beamlines for spatially-resolved studies nanomaterials. These facilities enable novel techniques, but also introduce especially need high brilliance and potential damage to samples. In addition, nanoscale spatial resolution...
<p>Underpotential deposition (UPD) is a phenomenon where atoms of an element M are deposited from ions M<sup>n+</sup> on substrate S at potentials more positive than for the M<sup>n+ </sup>on M. These systems have been studied century and interesting both applied fundamental point view. Despite vast literature subject, there no thermodynamic parameter so far able to characterize UPD system. Even if so-called “UPD shift” has used decades, limitations this fully...
The cost-effective production of green hydrogen is one the most important challenges for a sustainable energy transition. To decrease cost in through electrolysis, there are several obstacles that must be overcome. For instance, more active and stable anodes made abundant cheap materials will contribute to lowering capital operational expenditure process. It well-known oxidation water requires high overpotentials, which main limitation performance device. In this context, substituting (OER)...