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Charakterisierung anodischer Deckschichten an Platin-Elektroden mittels Röntgen-Photoelektronenspektroskopie

Characterization of anodic coatings on platinum electrodes by X-ray photoelectron spectroscopy

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Summary

A platinum electrode was anodically polarized at 3 V vs. SHE in 0.5 M H2SO4 and in 1 M NaOH at 3 V vs. Ag/AgCl reference electrode and the oxidic coatings formed were spectroscopically analyzed. The passive layers could be characterized by X-ray photoelectron and electron energy loss spectroscopy after transferring the electrode from the electrochemical cell into a UHV system. The coatings were found to consist of Pt(OH)4 (acid electrolyte) and PtO(OH)2 (alkaline electrolyte). Hydroxide seems also to be the predominant surface species at lower potentials in H2SO4. These investigations are in agreement with voltammetric in situ measurements.

Zusammenfassung

Eine Platinelektrode wurde bei 3 V vs. SHE in 0,5 M H2SO4 und bei 3 V vs. Ag/AgCl-Bezugselektrode in 1 M NaOH anodisch polarisiert und die entstandenen oxidischen Deckschichten spektroskopisch analysiert. Mittels Röntgen-Photoelektronen- und Elektronenenergieverlust-Spektroskopie konnten die Passivschichten nach Transfer der Elektrode aus der elektrochemischen Zelle in ein Ultrahochvakuumsystem als Pt(OH)4 (saurer Elektrolyt) und PtO(OH)2 (alkalischer Elektrolyt) charakterisiert werden. Auch bei niedrigeren Potentialen scheint in H2SO4 Hydroxid als Oberflächenspezies vorzuliegen. Diese Untersuchungen stehen in Einklang mit voltammetrischen In-situ-Messungen.

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Authors and Affiliations

  1. Institut für Grenzflächenforschung und Vakuumphysik, Kernforschungsanlage Jülich, Postfach 1913, D-5170, Jülich, Bundesrepublik Deutschland

    M. Peuckert & H. P. Bonzel

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  1. M. Peuckert
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  2. H. P. Bonzel
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Peuckert, M., Bonzel, H.P. Charakterisierung anodischer Deckschichten an Platin-Elektroden mittels Röntgen-Photoelektronenspektroskopie. Z. Anal. Chem. 319, 670–672 (1984). https://doi.org/10.1007/BF01226747

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  • DOI: https://doi.org/10.1007/BF01226747

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