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Deskins NA, Kimmel GA, Petrik NG. Observation of Molecular Hydrogen Produced from Bridging Hydroxyls on Anatase TiO 2(101). J Phys Chem Lett 2020; 11:9289-9297. [PMID: 33090788 DOI: 10.1021/acs.jpclett.0c02735] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Anatase TiO2 is used extensively in a wide range of catalytic and photocatalytic processes and is a promising catalyst for hydrogen production. Here, we show that molecular hydrogen was produced from bridging hydroxyls (HOb) on the (101) surface of single-crystal anatase (TiO2(101)). This stands in contrast to rutile TiO2(110), where HOb pairs react to form H2O. Electron bombardment at 30 K produced bridging oxygen vacancies in the surface. Deuterated bridging hydroxyls (DOb) were subsequently formed via dissociation of adsorbed D2O and confirmed by infrared reflection-absorption spectroscopy. During temperature-programmed desorption (TPD) spectroscopy, D2 desorption was observed at 520 K. Density functional theory calculations show that both H2 and H2O production from HOb are endothermic at 0 K on TiO2(101), but H2 (H2O) desorption is entropically driven above 230 K (800 K). The calculated activation barrier for H2 desorption is 1.40 eV, which is similar to the desorption energy obtained from analysis of the D2 TPD spectra. The H2 desorption likely proceeds in two steps: H atom diffusion on the surface and then recombination.
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Affiliation(s)
- N Aaron Deskins
- Department of Chemical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609, United States
| | - Greg A Kimmel
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Nikolay G Petrik
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
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2
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Wu L, Fu C, Huang W. Surface chemistry of TiO 2 connecting thermal catalysis and photocatalysis. Phys Chem Chem Phys 2020; 22:9875-9909. [PMID: 32363360 DOI: 10.1039/c9cp07001j] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Chemical reactions catalyzed under heterogeneous conditions have recently expanded rapidly from traditional thermal catalysis to photocatalysis due to the rising concerns about sustainable development of energy and the environment. Adsorption of reactants on catalyst surfaces, subsequent surface reactions, and desorption of products from catalyst surfaces occur in both thermal catalysis and photocatalysis. TiO2 catalysts are widely used in thermal catalytic and photocatalytic reactions. Herein we review recent progress in surface chemistry, thermal catalysis and photocatalysis of TiO2 model catalysts from single crystals to nanocrystals with the aim of examining if the surface chemistry of TiO2 can bridge the fundamental understanding between thermal catalysis and photocatalysis. Following a brief introduction, the structures of major facets exposed on TiO2 catalysts, including surface reconstructions and defects, as well as the electronic structure and charge properties, are firstly summarized; then the recent progress in adsorption, thermal chemistry and photochemistry of small molecules on TiO2 single crystals and nanocrystals is comprehensively reviewed, focusing on manifesting the structure-(photo)activity relations and the commonalities/differences between thermal catalysis and photocatalysis; and finally concluding remarks and perspectives are given.
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Affiliation(s)
- Longxia Wu
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China.
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3
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Zhang X, Bieberle-Hütter A. Modeling and Simulations in Photoelectrochemical Water Oxidation: From Single Level to Multiscale Modeling. CHEMSUSCHEM 2016; 9:1223-42. [PMID: 27219662 DOI: 10.1002/cssc.201600214] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Indexed: 05/11/2023]
Abstract
This review summarizes recent developments, challenges, and strategies in the field of modeling and simulations of photoelectrochemical (PEC) water oxidation. We focus on water splitting by metal-oxide semiconductors and discuss topics such as theoretical calculations of light absorption, band gap/band edge, charge transport, and electrochemical reactions at the electrode-electrolyte interface. In particular, we review the mechanisms of the oxygen evolution reaction, strategies to lower overpotential, and computational methods applied to PEC systems with particular focus on multiscale modeling. The current challenges in modeling PEC interfaces and their processes are summarized. At the end, we propose a new multiscale modeling approach to simulate the PEC interface under conditions most similar to those of experiments. This approach will contribute to identifying the limitations at PEC interfaces. Its generic nature allows its application to a number of electrochemical systems.
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Affiliation(s)
- Xueqing Zhang
- Photo-/Electrochemical Materials and Interfaces, Dutch Institute for Fundamental Energy Research (DIFFER), De Zaale 20, 5612 AJ, Eindhoven, The Netherlands
| | - Anja Bieberle-Hütter
- Photo-/Electrochemical Materials and Interfaces, Dutch Institute for Fundamental Energy Research (DIFFER), De Zaale 20, 5612 AJ, Eindhoven, The Netherlands.
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Sang L, Zhang Y, Wang J, Zhao Y, Chen YT. Correlation of the depletion layer with the Helmholtz layer in the anatase TiO2–H2O interface via molecular dynamics simulations. Phys Chem Chem Phys 2016; 18:15427-35. [DOI: 10.1039/c6cp01990k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By correlating the Helmholtz layer with the depletion layer, the depletion layer widths of anatase TiO2 surfaces (001), (100), and (101) are calculated.
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Affiliation(s)
- Lixia Sang
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation
- Ministry of Education
- Key Laboratory of Heat Transfer and Energy Conservation
- Beijing Municipality
- College of Environmental and Energy Engineering
| | - Yudong Zhang
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation
- Ministry of Education
- Key Laboratory of Heat Transfer and Energy Conservation
- Beijing Municipality
- College of Environmental and Energy Engineering
| | - Jun Wang
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation
- Ministry of Education
- Key Laboratory of Heat Transfer and Energy Conservation
- Beijing Municipality
- College of Environmental and Energy Engineering
| | - Yangbo Zhao
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation
- Ministry of Education
- Key Laboratory of Heat Transfer and Energy Conservation
- Beijing Municipality
- College of Environmental and Energy Engineering
| | - Yi-tung Chen
- Department of Mechanical Engineering
- University of Nevada Las Vegas
- Las Vegas
- USA
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5
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Li C, Monti S, Agren H, Carravetta V. Cysteine on TiO2(110): a theoretical study by reactive dynamics and photoemission spectra simulation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:8819-8828. [PMID: 25020148 DOI: 10.1021/la5014973] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Owing to the importance of bioinorganic interface properties for the biocompatibility of implants and for biosensing technology, it has become indispensable to gain understanding of their crucial structure-property relations at the atomistic level. Motivated by this fact, we use cysteine amino acid on perfect and defective TiO2(110) surfaces as model systems and study adsorption by means of classical all-atom reactive molecular dynamics and ab initio O 1s, N 1s, and S 2p photoemission spectra (XPS) simulations of the most relevant adsorbate structures. By analysis of the dynamics results and a detailed comparison with spectra recently collected for this adsorbate, we obtain conclusions of both general and particular character. It is shown that the interaction of cysteine with the TiO2(110) surface has multipoint character involving the carboxylic group as well as the amino and sulfur groups. The proton-transfer reactivity of cysteine is enhanced by the presence of the surface, and different forms of cysteines are confirmed to be present in the adsorbate. A general conclusion is that reactive force field dynamics combined with selected spectroscopy provides a viable path to understanding bioinorganic surfaces with ramifications for the design of such surfaces for future technological applications.
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Affiliation(s)
- Cui Li
- Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology , SE-10044 Stockholm, Sweden
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6
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Lozovoi AY, Pashov DL, Sheppard TJ, Kohanoff JJ, Paxton AT. Universal tight binding model for chemical reactions in solution and at surfaces. III. Stoichiometric and reduced surfaces of titania and the adsorption of water. J Chem Phys 2014; 141:044505. [DOI: 10.1063/1.4890492] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- A. Y. Lozovoi
- Atomistic Simulation Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, Northern Ireland, United Kingdom
| | - D. L. Pashov
- Department of Physics, King's College London, Strand, London WC2R 2LS, United Kingdom
| | - T. J. Sheppard
- Atomistic Simulation Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, Northern Ireland, United Kingdom
| | - J. J. Kohanoff
- Atomistic Simulation Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, Northern Ireland, United Kingdom
| | - A. T. Paxton
- Department of Physics, King's College London, Strand, London WC2R 2LS, United Kingdom
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Soundarrajan P, Sankarasubramanian K, Sethuraman K, Ramamurthi K. Controlled (110) and (101) crystallographic plane growth of single crystalline rutile TiO2 nanorods by facile low cost chemical methods. CrystEngComm 2014. [DOI: 10.1039/c4ce00820k] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new approach has been employed to grow large rutile TiO2 nanorods (NRs) with a high number density by low cost chemical methods.
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Affiliation(s)
- P. Soundarrajan
- School of Physics
- Madurai Kamaraj University
- Madurai 625021, India
| | | | - K. Sethuraman
- School of Physics
- Madurai Kamaraj University
- Madurai 625021, India
| | - K. Ramamurthi
- Department of Physics and Nanotechnology
- SRM University
- Chennai 603203, India
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Akimov AV, Neukirch AJ, Prezhdo OV. Theoretical Insights into Photoinduced Charge Transfer and Catalysis at Oxide Interfaces. Chem Rev 2013; 113:4496-565. [DOI: 10.1021/cr3004899] [Citation(s) in RCA: 402] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Alexey V. Akimov
- Department of Chemistry, University of Rochester, Rochester, New York 14627,
United States
- Chemistry
Department, Brookhaven National Laboratory, Upton, New York 11973-5000,
United States
| | - Amanda J. Neukirch
- Department
of Physics and Astronomy, University of Rochester, Rochester, New York 14627,
United States
| | - Oleg V. Prezhdo
- Department of Chemistry, University of Rochester, Rochester, New York 14627,
United States
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Wu C, Chen M, Skelton AA, Cummings PT, Zheng T. Adsorption of arginine-glycine-aspartate tripeptide onto negatively charged rutile (110) mediated by cations: the effect of surface hydroxylation. ACS APPLIED MATERIALS & INTERFACES 2013; 5:2567-2579. [PMID: 23461392 DOI: 10.1021/am3031568] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Classical molecular dynamics (MD) simulations were employed to investigate the adsorption behaviors of arginine-glycine-aspartate (RGD) tripeptide onto the negatively charged hydroxylated/nonhydroxylated rutile (110) surfaces, mediated by biologically important cations (Na+ or Ca2+). The simulation results indicate that the inherent nature of the cation determines its binding strength, thereby regulating the adsorption geometry of the peptide. The sparse hydroxyl groups on the nonhydroxylated rutile diminish the probability of H-bond formation between RGD and the surface, resulting in an early desorption of the peptide even with a mediating Na+ ion. In contrast, the negatively charged aspartate (Asp) side chain is bridged to the negatively charged hydroxylated rutile by an inner-sphere Na+ ion, in coordination with the Asp-rutile hydrogen bonds at the anchoring sites. The inner- and outer-sphere Ca2+ ions are demonstrated to be capable of "trapping" RGD on both hydroxylated and nonhydroxylated rutile, in the absence of hydrogen bonds with the surface. The strongly bound inner-sphere mediating Ca2+ ion exerts a "gluing" effect on the Asp side chain, producing a tightly packed RGD-rutile complex, whereas a less localized distribution density of the outer-sphere mediating Ca2+ ion results in a higher mobility of the Asp side chain. The intramolecular interaction is suggested to facilitate the structural stability of RGD adsorbed on the negative rutile in a "horseshoe" configuration.
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Affiliation(s)
- Chunya Wu
- Center for Precision Engineering, Harbin Institute of Technology, P.O. Box 413, Harbin, Heilongjiang 150001, China.
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Lee C, Maeng G, Kim HW, Sohlberg K. Quantum mechanical modeling of a tripodal [2]rotaxane and its binding to TiO2. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2011.02.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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First-principles calculation of core-level binding energy shift in surface chemical processes. Sci China Chem 2010. [DOI: 10.1007/s11426-010-0086-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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12
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Sun C, Liu LM, Selloni A, Lu GQ(M, Smith SC. Titania-water interactions: a review of theoretical studies. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm01491e] [Citation(s) in RCA: 225] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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