Cobalt oxide surface chemistry : The interaction of CoO ( 1 0 0 ) , Co 3 O 4 ( 1 1 0 ) , and Co 3 O 4 ( 1 1 1 ) with oxygen and water

Content Provider	Semantic Scholar
Author	Petitto, Sarah C. Marsh, Erin M. Carson, Gregory A. Langell, Marjorie A.
Copyright Year	2017
Abstract	Cobalt oxides comprise two readily accessible cation oxidation states: Co2+ and Co3+, which are thermodynamically competitive under common ambient conditions, and redox mechanisms connecting the two states are largely responsible for their success in partial oxidation catalysis. In our studies, CoO(1 0 0), Co3O4(1 1 0), and Co3O4(1 1 1) single crystal substrates have been investigated with X-ray photoelectron spectroscopy (XPS), high-resolution electron energy loss spectroscopy (HREELS), and low energy electron diffraction (LEED) for their surface reactivity toward O2 and H2O and for their stability under reducing UHV conditions. There is facile inter-conversion between CoO and Co3O4 stoichiometry at the oxide surface which, despite the compositional variability, remains well ordered in longrange structure. Surface impurities, however, can pin the surface at either CoO or Co3O4 compositional extremes. Contrary to reports of a pressure gap that creates difficulty in oxide hydroxylation under UHV, it is possible to hydroxylate both cobalt monoxide and spinel oxide substrates with H2O, provided sufficient activation is available to dissociate the water molecule.
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Alternate Webpage(s)	http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1019&context=chemistrylangell
Alternate Webpage(s)	http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1021&context=chemistrylangell
Language	English
Access Restriction	Open
Subject Keyword	Carbon Dioxide Catalysis Cations Cobalt Cobalt:SCnc:Pt:Bld:Qn Electron diffraction Electron energy loss spectroscopy Epitaxy Hepatitis B Surface Antigens Hydroxylation IBM Notes Image resolution MT-CO3 gene Mental Orientation Order (action) Oxides Oxygen Phonon Photoelectric effect Spatial variability Water X-Ray Photoelectron Spectroscopy carboxyl radical cobaltous cation oxidation spinell
Content Type	Text
Resource Type	Article