Quantitative Analysis of the Oxidation State of Cobalt Oxides by Resonant Photoemission Spectroscopy

Lykhach Y, Piccinin S, Skála T, Bertram M, Tsud N, Brummel O, Farnesi Camellone M, Beranová K, Neitzel A, Fabris S, Prince KC, Matolín V, Libuda J (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Journal of Physical Chemistry Letters American Chemical Society

Pages Range: 6129-6136

DOI: 10.1021/acs.jpclett.9b02398

Abstract

Quantitative assessment of the charge transfer phenomena in cobalt oxides and cobalt complexes is essential for the design of advanced catalytic materials. We propose a method for the evaluation of the oxidation state of cobalt oxides with mixed valence states using resonant photoemission spectroscopy. The method is based on the calculation of the resonant enhancement ratio (RER) from the heights of the resonant features associated with the Co3+ and Co2+ states. The nature of the corresponding states was corroborated by means of density functional calculations. We employed a well-ordered Co3O4(111) film to calibrate the RER with respect to the atomic Co3+/Co2+ ratio. The method was applied to monitor the reduction of a well-ordered Co3O4(111) film to CoO(111) upon annealing under exposure to isopropanol. We demonstrate that this method yields the stoichiometry of cobalt oxides at a level of accuracy that cannot be achieved when fitting the Co 2p core level spectra.

Authors with CRIS profile

Yaroslava Lykhach Lehrstuhl für Physikalische Chemie II Manon Bertram Lehrstuhl für Katalytische Grenzflächenforschung Olaf Brummel Lehrstuhl für Physikalische Chemie II Armin Neitzel Lehrstuhl für Physikalische Chemie II Jörg Libuda Lehrstuhl für Katalytische Grenzflächenforschung

Involved external institutions

IOM - Istituto Officina dei Materiali IT Italy (IT) Univerzita Karlova v Praze / Charles University in Prague CZ Czech Republic (CZ) Elettra Sincrotrone Trieste S.C.p.A. IT Italy (IT)

How to cite

APA:

Lykhach, Y., Piccinin, S., Skála, T., Bertram, M., Tsud, N., Brummel, O.,... Libuda, J. (2019). Quantitative Analysis of the Oxidation State of Cobalt Oxides by Resonant Photoemission Spectroscopy. Journal of Physical Chemistry Letters, 6129-6136. https://dx.doi.org/10.1021/acs.jpclett.9b02398

MLA:

Lykhach, Yaroslava, et al. "Quantitative Analysis of the Oxidation State of Cobalt Oxides by Resonant Photoemission Spectroscopy." Journal of Physical Chemistry Letters (2019): 6129-6136.

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