Oxidation of adsorbed CO on Pt(111) in CO-saturated perchloric acid aqueous solutions: Simultaneous in situ time-resolved reflectance spectroscopy and second harmonic generation studiesd

Article Abstract:

Simultaneous normalized differential reflectance spectroscopy and second harmonic generation (SHG) is employed. The purpose is to follow, independently, OH and adsorbed CO on a single Pt(111) microfacet in CO-saturated aqueous perchloric acidic solutions during voltammetric cycles, leading to the oxidation of [CO.sub.ads] and subsequent readsorption of CO on the surface and the results are consistent.

Industrial Gas Manufacturing, Industrial gases, Carbon Dioxide, Spectra, Platinum compounds

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Sum-frequency vibrational spectroscopy of CO adsorption on Pt(111) and Pt(110) electrode surfaces in perchloric acid solution: effects of thin-layer electrolytes in spectroelectrochemistry

Article Abstract:

The sum-frequency vibrational spectra of CO adsorbed on (111)- and (110)-oriented Pt single-crystal electrodes in a 0.1 M HCIO4 aqueous electrolyte are discussed. The comparison of sum-frequency generation (SFG) spectra with single-frequency measurements showed that preoxidation is an effective mechanism for CO desorption in experiments utilizing a thin-layer electrolyte configuration.

Copper, Electrodes, Chemical compounds

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First evidence of the oxidation and regeneration of polysulfides at a GaAs electrode, under anodic conditions. A study by in situ UV-visible spectroelectrochemistry

Article Abstract:

The study reports on the oxidation and regeneration, at a GaAs electrode, of polysulfides present in (NH4)2Sn aqueous solutions. It concludes that under conditions of anodic current and electrolyte composition, the surface of the GaAs anode is neither oxidized no passivated.

Oxidation-reduction reaction, Oxidation-reduction reactions, Gallium arsenide, Polysulfides

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