The co-adsorption of UPD copper and irreversibly adsorbed bismuth on Pt(111) and Pt(100) electrodes

Article Abstract:

The underpotential deposition of copper onto irreversibly adsorbed bismuth-modified Pt(111) and Pt(100) electrodes was investigated with emphasis on the deposition process in sulfuric acid electrolytes with and without the presence of halide anions. Results revealed a formation of a simple mixed adlattice of bismuth and copper adatoms, with copper adsorbing onto the remaining free platinum sites not occupied by bismuth. A similar adlattice behavior was found to occur when Bi/Pt(111) is immersed into the copper UPD solution containing halide anions.

Adsorption, Platinum compounds

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Effects of electrolyte identity and the presence of anions on the redox behavior of irreversibly adsorbed bismuth on Pt(111)

Article Abstract:

The redox characteristics associated with irreversibly adsorbed bismuth on Pt(111) electrodes was observed to be highly dependent on the presence of anions in the electrolyte. In a sulfuric acid electrolyte, it is proposed that the two redox peaks associated with the high coverage bismuth adlayer correspond to the production of a bismuth hydroxide and oxide network upon bismuth oxidation. After potential scanning, this network was replaced by (bi)sulfate, which results in the appearance of two new redox peaks with a sharp isopotential point.

Analysis, Platinum, Oxidation-reduction reaction, Oxidation-reduction reactions, Electrolytes

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X-ray and electrochemical studies on Cu UPD and Au(111) single-crystal electrodes in the presence of bromide

Article Abstract:

A study was conducted to analyze the underpotential deposition of copper on Au(111) during the presence of bromide anions using electrochemical methods, crystal truncation rod measurements and in-situ grazing incidence x-ray diffraction. The x-ray reflections were correlated to the hexagonal coordinations of the Au(111) substrate. Specular crystal truncation red measurements were then performed across the Brag diffraction points.

Usage, Electrochemistry, Bromides, X-ray diffractometer, X-ray diffractometers, Bromides (Chemistry)

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