Structure-Dependent Dissociation of Water on Cobalt Oxide

Schwarz M, Faisal F, Mohr S, Hohner C, Werner K, Xu T, Skala T, Tsud N, Prince KC, Matolin V, Lykhach Y, Libuda J (2018)

Publication Status: Published

Publication Type: Journal article

Publication year: 2018

Journal

Journal of Physical Chemistry Letters American Chemical Society

Publisher: AMER CHEMICAL SOC

Book Volume: 9

Pages Range: 2763-2769

Journal Issue: 11

DOI: 10.1021/acs.jpclett.8b01033

Abstract

Understanding the correlation between structure and reactivity of oxide surfaces is vital for the rational design of catalytic materials. In this work, we demonstrate the exceptional degree of structure sensitivity of the water dissociation reaction for one of the most important materials in catalysis and electrocatalysis. We studied H2O on two atomically defined cobalt oxide surfaces, CoO(100) and Co3O4(111). Both surfaces are terminated by O2- and Co2+ in different coordination. By infrared reflection absorption spectroscopy and synchrotron radiation photoelectron spectroscopy we show that H2O adsorbs molecularly on CoO(100), while it dissociates and forms very strongly bound OH and partially dissociated (H2O)(n)(OH)(m) clusters on Co3O4(111). We rationalize this structure dependence by the coordination number of surface Co2+. Our results show that specific well-ordered cobalt oxide surfaces interact very strongly with H2O whereas others do not. We propose that this structure dependence plays a key role in catalysis with cobalt oxide nanomaterials.

Authors with CRIS profile

Matthias Schwarz Lehrstuhl für Physikalische Chemie II Firas Faisal Lehrstuhl für Physikalische Chemie II Susanne Mohr Lehrstuhl für Physikalische Chemie II Chantal Hohner Lehrstuhl für Physikalische Chemie II Kristin Werner Lehrstuhl für Physikalische Chemie II Tao Xu Lehrstuhl für Physikalische Chemie II Yaroslava Lykhach Lehrstuhl für Physikalische Chemie II Jörg Libuda Professur für Physikalische Chemie

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials (EAM)

Involved external institutions

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:

Schwarz, M., Faisal, F., Mohr, S., Hohner, C., Werner, K., Xu, T.,... Libuda, J. (2018). Structure-Dependent Dissociation of Water on Cobalt Oxide. Journal of Physical Chemistry Letters, 9(11), 2763-2769. https://doi.org/10.1021/acs.jpclett.8b01033

MLA:

Schwarz, Matthias, et al. "Structure-Dependent Dissociation of Water on Cobalt Oxide." Journal of Physical Chemistry Letters 9.11 (2018): 2763-2769.

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