Nitric oxide adsorption at Pt(100) electrode surfaces

Nitric oxide adlayers formed at Pt(100) electrode surfaces have been characterized in situ by means of electrochemical and FTIR spectroscopic experiments. These adlayers can be reductively stripped from the electrode surface yielding dissolved ammonium as the main reduction product in acidic solutio...

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Veröffentlicht in:Electrochimica acta 1998-01, Vol.44 (6), p.1077-1090
Hauptverfasser: Rodes, A., Climent, V., Orts, J.M., Pérez, J.M., Aldaz, A.
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container_end_page 1090
container_issue 6
container_start_page 1077
container_title Electrochimica acta
container_volume 44
creator Rodes, A.
Climent, V.
Orts, J.M.
Pérez, J.M.
Aldaz, A.
description Nitric oxide adlayers formed at Pt(100) electrode surfaces have been characterized in situ by means of electrochemical and FTIR spectroscopic experiments. These adlayers can be reductively stripped from the electrode surface yielding dissolved ammonium as the main reduction product in acidic solution. From the voltammetric charge involved in this process the absolute NO coverage for the saturated adlayers has been calculated to be 0.5. This value agrees with that corresponding to the c(4×2) overlayer found by different authors under UHV conditions. The oxidation of the NO adlayer in acid media proceeds between 0.90 and 1.10 V RHE through the formation of surface species (probably a mixture of nitrite and nitro species), which can be further oxidized to dissolved nitrate anions at higher potentials. The same NO adlayers have been found to oxidize directly to dissolved nitrite anions in alkaline solutions. The potential dependence of the N–O stretching mode, which is shifted towards higher wavenumbers when the electrode potential increases, has been analyzed for the saturated NO adlayer. Linear relations were found both in acidic and neutral solutions with tuning rates of ca. 50 cm −1 V −1 in the potential region between 0.50 and 0.90 V RHE where the saturated NO adlayers are stable. A slow dissolution process has been evidenced at potentials slightly below 0.80 V for the NO adlayer in alkaline solutions.
doi_str_mv 10.1016/S0013-4686(98)00211-4
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source ScienceDirect Journals (5 years ago - present)
subjects Adsorption
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Nitric oxide
Pt electrode surfaces
Study of interfaces
title Nitric oxide adsorption at Pt(100) electrode surfaces
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