Mechanistic study of the electrochemical oxygen reduction reaction on Pt(111) using density functional theory

Article Abstract:

Density functional theory is used to study the electrolyte solution effects on the oxygen reduction reaction on Pt(111) and to model the acid electrolyte, an [H5O2.sup. +] cluster is used. The vibrational proton oscillation modes for adsorbed [H5O2.sup. +] computed at 1711 and 1010 [cm.sup. -1], in addition to OH stretching and H2O scissoring modes, agree with experimental vibrational spectra for proton formation on Pt surfaces in ultrahigh vacuum.

Usage, Observations, Spectra, Oxidation-reduction reaction, Oxidation-reduction reactions, Density functionals, Density functional theory

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Probing electric fields at the ionic liquid-electrode interface using sum frequency generation spectroscopy and electrochemistry

Article Abstract:

The arrangement of ions at the platinum electrode in the room-temperature ionic liquid 1-butyl 3-methylimidazolium tetrafluoroborate is determined using sum frequency generation vibrational spectroscopy (SFG), electrochemical impedance spectroscopy (EIS), and the vibrational Stark effect. The result indicates that the ions of a neat ionic liquid are organized in a Helmholtz layer at the electrified metal electrode interface.

Electric fields

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Electrodeposition of platinum on highly oriented pyrolytic graphite. Part I: Electrochemical characterization

Article Abstract:

The electrochemical deposition of Pt on highly oriented pyrolytic graphite from H(sub 2)PtCl(sub 6) (HOPG) solutions was investigated by cyclic voltammetry and chronoamperometry. The results indicated that the most appropriate conditions for growing Pt nanoparticles on HOPG with narrow size distribution are to use an H(sub 2)PtCl(sub 6) solution with HCl as supporting electrolyte and to apply a high cathodic overpotential.

Nanoparticles

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