Journal article
Structures and Thermodynamic Stability of Cobalt Molybdenum Oxide (CoMoO 4 -II)
Surface Science, Vol.677, pp.52-59
2018
Abstract
This contribution reports density functional theory (DFT) calculations on structural and electronic properties of bulk and surfaces of cobalt molybdenum oxide CoMoO4-II; i.e., a material that enjoys a wide array of chemical catalytic and optical applications. Estimated lattice constants and atomic charges for bulk CoMoO4-II reproduce limited analogous experimental measurements. Bader's charges confirm the ionic nature for metal-O bonds in bulk and surfaces of CoMoO4-II. Plotted partial density of states reveal a narrow band gap of 1.8 eV for bulk CoMoO4-II. We found that cleaving bulk of CoMoO4-II along the low-Miller indices afford twelve distinct surfaces. Upward displacement of oxygen atom becomes evident when contrasting bulk positioning of atoms with relaxed surfaces. The two mixed Mo/O- and Co/O–terminated surfaces dominate the thermodynamic stability diagram at 1 atm and 300 – 1400 K, and across a wide range of oxygen chemical potential. The presence of surface oxygen atoms in these stable surfaces is expected to facilitate the occurrence of oxygen reduction reactions as experimentally demonstrated. Likewise, the adjacent surface cations (Mo4+/Co2+) and anions (O2−) serve as Lewis-acid pairs; i.e., very potent active sites in prominent catalysis reactions.
Details
- Title
- Structures and Thermodynamic Stability of Cobalt Molybdenum Oxide (CoMoO 4 -II)
- Authors/Creators
- I.S. Altarawneh (Author/Creator) - German Jordanian UniversityS.E. Rawadieh (Author/Creator) - Al-Hussein Bin Talal UniversityM.A. Batiha (Author/Creator) - Al-Hussein Bin Talal UniversityL.A. Al-Makhadmeh (Author/Creator) - Al-Hussein Bin Talal UniversityM.A. Al-Shaweesh (Author/Creator) - Al-Hussein Bin Talal UniversityM.K. Altarawneh (Author/Creator) - Al-Hussein Bin Talal University
- Publication Details
- Surface Science, Vol.677, pp.52-59
- Publisher
- Elsevier BV
- Identifiers
- 991005542142207891
- Copyright
- © 2018 Elsevier B.V.
- Murdoch Affiliation
- School of Engineering and Information Technology
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 2 Chemistry
- 2.41 Catalysts
- 2.41.25 Catalytic Oxidation
- Web Of Science research areas
- Chemistry, Physical
- Physics, Condensed Matter
- ESI research areas
- Physics