Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
1 PublicationIn situ Spectroelectrochemical Investigation of Pt(II/IV) Oxidation in Aqueous Solution Using X-ray Absorption Spectroscopy
Takao, K.; Takao, S.; Scheinost, A. C.; Bernhard, G.; Hennig, C.
Abstract
The oxidation from PtIICl42− to PtIVCl62− in HCl aq. was studied in situ by combining electrochemistry with XAFS spectroscopy. During the oxidation of PtIICl42−, isosbestic points were observed in Pt LIII and LII XANES spectra as a function of time, indicating that the Pt(II/IV) redox equilibrium is the only reaction in the system. The Pt LIII and LII X-ray absorption edge energies of the initial PtIICl42− are 11562.9 and 13271.8 eV, respectively, while those of the electrolyzed species are 11564.6 and 13273.7 eV which are identical with those of a PtIVCl62 reference sample. The coordination of the electrolyzed species was characterized by structural parameters derived from the EXAFS curve fit, and identified to PtIVCl62.
Keywords: XAFS; Spectroelectrochemistry; Platinum(II/IV); Redox; Molecular Structure
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Inorganica Chimica Acta 363(2010)4, 802-806
DOI: 10.1016/j.ica.2009.11.032
Cited 9 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-13060