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Evolution of Oxygen–Metal Electron Transfer and Metal Electronic States During Manganese Oxide Catalyzed Water Oxidation Revealed with In Situ Soft X‐Ray Spectroscopy

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Jones,  Travis
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Skorupska,  Katarzyna
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Abteilung Heterogene Reaktionen, Max-Planck-Institut für Chemische Energiekonversion;

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Mom,  Rik
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Abteilung Heterogene Reaktionen, Max-Planck-Institut für Chemische Energiekonversion;

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Citation

Tesch, M., Bonke, S., Jones, T., Shaker, M., Xiao, J., Skorupska, K., et al. (2019). Evolution of Oxygen–Metal Electron Transfer and Metal Electronic States During Manganese Oxide Catalyzed Water Oxidation Revealed with In Situ Soft X‐Ray Spectroscopy. Angewandte Chemie International Edition, 58(11), 3426-3432. doi:10.1002/anie.201810825.


Cite as: http://hdl.handle.net/21.11116/0000-0002-EA5F-D
Abstract
Manganese oxide (MnOx) electrocatalysts are examined herein by in situ soft X‐ray absorption spectroscopy (XAS) and resonant inelastic X‐ray scattering (RIXS) during the oxidation of water buffered by borate (pH 9.2) at potentials from 0.75 to 2.25 V vs. the reversible hydrogen electrode. Correlation of L‐edge XAS data with previous mechanistic studies indicates MnIV is the highest oxidation state involved in the catalytic mechanism. MnOx is transformed into birnessite at 1.45 V and does not undergo further structural phase changes. At potentials beyond this transformation, RIXS spectra show progressive enhancement of charge transfer transitions from oxygen to manganese. Theoretical analysis of these data indicates increased hybridization of the Mn−O orbitals and withdrawal of electron density from the O ligand shell. In situ XAS experiments at the O K‐edge provide complementary evidence for such a transition. This step is crucial for the formation of O2 from water.