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Kakekhani A, Roling LT, Kulkarni A, Latimer AA, Abroshan H, Schumann J, AlJama H, Siahrostami S, Ismail-Beigi S, Abild-Pedersen F, Nørskov JK. Nature of Lone-Pair–Surface Bonds and Their Scaling Relations. Inorg Chem 2018; 57:7222-7238. [DOI: 10.1021/acs.inorgchem.8b00902] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Arvin Kakekhani
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Luke T. Roling
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Ambarish Kulkarni
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Allegra A. Latimer
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Hadi Abroshan
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Julia Schumann
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Hassan AlJama
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Samira Siahrostami
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Sohrab Ismail-Beigi
- Department of Applied Physics, Yale University, New Haven, Connecticut 06520, United States
| | - Frank Abild-Pedersen
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Jens K. Nørskov
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
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Halwidl D, Mayr-Schmölzer W, Setvin M, Fobes D, Peng J, Mao Z, Schmid M, Mittendorfer F, Redinger J, Diebold U. A full monolayer of superoxide: oxygen activation on the unmodified Ca 3Ru 2O 7(001) surface. JOURNAL OF MATERIALS CHEMISTRY. A 2018; 6:5703-5713. [PMID: 30009023 PMCID: PMC6003542 DOI: 10.1039/c8ta00265g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 03/04/2018] [Indexed: 05/20/2023]
Abstract
Activating the O2 molecule is at the heart of a variety of technological applications, most prominently in energy conversion schemes including solid oxide fuel cells, electrolysis, and catalysis. Perovskite oxides, both traditionally-used and novel formulations, are the prime candidates in established and emerging energy devices. This work shows that the as-cleaved and unmodified CaO-terminated (001) surface of Ca3Ru2O7, a Ruddlesden-Popper perovskite, supports a full monolayer of superoxide ions, O2-, when exposed to molecular O2. The electrons for activating the molecule are transferred from the subsurface RuO2 layer. Theoretical calculations using both, density functional theory (DFT) and more accurate methods (RPA), predict the adsorption of O2- with Eads = 0.72 eV and provide a thorough analysis of the charge transfer. Non-contact atomic force microscopy (nc-AFM) and scanning tunnelling microscopy (STM) are used to resolve single molecules and confirm the predicted adsorption structures. Local contact potential difference (LCPD) and X-ray photoelectron spectroscopy (XPS) measurements on the full monolayer of O2- confirm the negative charge state of the molecules. The present study reports the rare case of an oxide surface without dopants, defects, or low-coordinated sites readily activating molecular O2.
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Affiliation(s)
- Daniel Halwidl
- Institute of Applied Physics , TU Wien , Wiedner Hauptstrasse 8-10/134 , 1040 Vienna , Austria .
| | - Wernfried Mayr-Schmölzer
- Institute of Applied Physics , TU Wien , Wiedner Hauptstrasse 8-10/134 , 1040 Vienna , Austria .
- Center for Computational Materials Science , TU Wien , Wiedner Hauptstrasse 8-10/134 , 1040 Vienna , Austria
| | - Martin Setvin
- Institute of Applied Physics , TU Wien , Wiedner Hauptstrasse 8-10/134 , 1040 Vienna , Austria .
| | - David Fobes
- Department of Physics and Engineering Physics , Tulane University , 2001 Percival Stern Hall , New Orleans , LA 70118 , USA
| | - Jin Peng
- Department of Physics and Engineering Physics , Tulane University , 2001 Percival Stern Hall , New Orleans , LA 70118 , USA
| | - Zhiqiang Mao
- Department of Physics and Engineering Physics , Tulane University , 2001 Percival Stern Hall , New Orleans , LA 70118 , USA
| | - Michael Schmid
- Institute of Applied Physics , TU Wien , Wiedner Hauptstrasse 8-10/134 , 1040 Vienna , Austria .
| | - Florian Mittendorfer
- Institute of Applied Physics , TU Wien , Wiedner Hauptstrasse 8-10/134 , 1040 Vienna , Austria .
- Center for Computational Materials Science , TU Wien , Wiedner Hauptstrasse 8-10/134 , 1040 Vienna , Austria
| | - Josef Redinger
- Institute of Applied Physics , TU Wien , Wiedner Hauptstrasse 8-10/134 , 1040 Vienna , Austria .
- Center for Computational Materials Science , TU Wien , Wiedner Hauptstrasse 8-10/134 , 1040 Vienna , Austria
| | - Ulrike Diebold
- Institute of Applied Physics , TU Wien , Wiedner Hauptstrasse 8-10/134 , 1040 Vienna , Austria .
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