A5101457128- Electrocatalysts for Energy Conversion
- CO2 Reduction Techniques and Catalysts
- Electrochemical sensors and biosensors
- Electrochemical Analysis and Applications
- Catalytic Processes in Materials Science
- Advanced battery technologies research
- Advanced Photocatalysis Techniques
- Fuel Cells and Related Materials
- Supercapacitor Materials and Fabrication
- Water Quality Monitoring and Analysis
- Catalysis and Hydrodesulfurization Studies
- Catalysis for Biomass Conversion
- Advanced Materials Characterization Techniques
- nanoparticles nucleation surface interactions
- Nanomaterials for catalytic reactions
- Advanced Chemical Sensor Technologies
- Analytical Chemistry and Sensors
- Catalysis and Oxidation Reactions
Universidade Estadual de Campinas (UNICAMP)
2016-2024
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)...
The combination of energy and chemical conversion can be achieved by designing glycerol fuel cells. However, the anode must promote reaction at onset potentials low enough to allow a spontaneous reaction, when coupled cathodic selective. Here, we build three-dimensional (3D)-printed microfluidic cell that produces power concomitantly glycolate formate zero bias. balance between two carbonyl compounds is tuned decorating Pt/C/CP in situ (before feeding reactants) or operando (while with Bi....
Abstract Herein we show that Pt(111) and Pt(100) can produce the ketone through oxidation of secondary carbon polyols. After Bi modification, selectivity for formation increases. On other hand, observe pure Bi‐modified Pt(110) only produced C3 molecules oxidized in primary carbon, it is facet shows an enhancement activity due to modification. In line with these findings, small Pt nanoparticles are not selective formation. Finally, based on data obtained DFT calculations, suggest positively...
The electro-oxidation of alcohols and polyols plays a pivotal role in energy conversion biomass utilization, offering profound implications for producing via fuel cells the synthesis value-added chemicals, including derivatives green hydrogen, through electrolyzers. Addressing challenge catalyst poisoning need enhanced catalytic activity, this study delves into utilizing p-block elements (Bi, Pb, Tl, Se, Ge, Sb, Sn, In, S) adsorbed on platinum electrodes. This approach is chosen to mitigate...
Glycerol photoelectrochemical conversion into value-added chemicals by using a Bi 2 Fe 4 O 9 photoanode at different pH values.
This study unveils a novel role of bare graphite as catalyst in glycerol electrooxidation and hydrogen evolution reactions, challenging the prevailing notion that current collectors employed electrolyzers are inert. Half-cell experiments elucidate feasibility oxidation production on bulk electrodes at potentials exceeding 1.7 V. The investigation varying concentrations (0.05 to 1.5 mol L-1) highlights concentration-dependent competition between oxygen reactions. Employing an H-type...
The oxidation of glycerol to value-added products is very important from the economic point view.In this work we performed HPLC experiments with most containing three atoms C.
We studied the underpotential deposition (UPD) of copper on polycrystalline gold in both alkaline and acidic media to determine dependence coverage equilibrium potential system also thermodynamic conditions for formation a monolayer.The behavior was through potentiostatic potentiodynamic experiments.Results shows that process is slower occurs at higher potentials due very low activity Cu(II) ions this condition.
The high demand for the biodiesel has increased glycerol (GlOH) generation, since it is a co-product of production, surpassing industrial demand. In this context, electrooxidation reaction (GER) an interesting option its chemical valorization, generating value-added products. present work, we studied GER on different surfaces Pt single crystals modified with bismuth to understand effect catalyst structure activity and pathways.
We studied the glycerol electrooxidation reaction (GEOR) on Pt surfaces modified by Bi adatoms to understand effect of catalyst strucutre activity and selectivity. This investigation was performed using a combination electrochemical (cyclic voltammetry), chromatographic (HPLC) spectroscopic (FTIR) techniques. Our results show that presence blocks pathways lead CO formation, poisoning intermediate, increase production rate glyceric acid.