16 research outputs found
Open circuit potential shifts of activated carbon in aqueous solutions during chemical and adsorption interactions
Effect of conditions of formation of composite pyrographite/Nafion-polyaniline-Pt anode upon electrooxidation of methanol
PtâNi carbon-supported catalysts for methanol oxidation prepared by Ni electroless deposition and its galvanic replacement by Pt
Electrochemical deposition of platinum nanoparticles on different carbon supports and conducting polymers
Electrodeposition of Pt nanoparticles under
potentiostatic conditions was performed on several types of carbon electrode supports: commercial macroporous carbon (a three-dimensional electrode), glassy carbon and
graphite. Conducting polymers (poly-aniline and poly-oaminophenol) were also used. The platinum nanoparticles were obtained by different Potential Step Deposition (PSD)
methods in 5 mM H2PtCl6 + 0.5 M H2SO4 aqueous
solutions. The effect of the final potential, time and number of steps on the quantity, distribution and size of the platinum nanoparticles was analysed. The mechanism of the electrochemical deposition of platinum was studied through the application of theoretical modelling. The progressive nucleation mechanism provided the closest agreement with the results obtained. In addition, the chemical state and morphology of the electrodeposited
materials were determined by means of SEM, TEM and XPS. The results show that the carbon material structure has a strong influence on the Pt particle structure and this, in turn, affects the catalytic activity.Spanish Ministerio de EducaciĂłn y Ciencia (Projects CTQ2006-08958/PPQ and MAT2004-1479) and the EU (FEDER)
Study of 2-Propanol, 1-Propanol, and Acetone Electrochemical Oxidation on Pt in Gelled Phosphoric Acid at 170 °C
Electrocatalytic activity of polyaniline-copper composites in electrohydrogenation of p-nitroaniline
Electrochemical carbon dioxide and bicarbonate reduction on copper in weakly alkaline media
The electrochemical reduction of CO2 on copper is an intensively studied reaction. However, there has not been much attention for CO2 reduction on copper in alkaline electrolytes, because this creates a carbonate buffer in which CO2 is converted in HCO3 (-) and the pH of the electrolyte decreases. Here, we show that electrolytes with phosphate buffers, which start off in the alkaline region and, after saturation with CO2, end up in the neutral region, behave differently compared to CO2 reduction in phosphate buffers which starts off in the neutral region. In initially alkaline buffers, a reduction peak is observed, which is not seen in neutral buffer solutions. In contrast with earlier literature reports, we show that this peak is not due to the formation of a CO adlayer on the electrode surface but due to the production of formate via direct bicarbonate reduction. The intensity of the reduction peak is influenced by electrode morphology and the identity of the cations and anions in solution. It is found that a copper nanoparticle-covered electrode gives a rise in intensity in comparison with mechanically polished and electropolished electrodes. The peak is observed in the SO4 (2-)-, ClO4 (-)-, and Cl-- containing electrolytes, but the formate-forming peak is not seen with Br- and I-