Time-dependent Nonadiabatic Investigations on the Photo-generated Carrier Dynamics at TiO2/molecule Interfaces
EMSL Project ID
48900
Abstract
Band gap excitation of TiO2 instigates photocatalytic reactions. In the presence of molecular adsorbates the generated holes and electrons act as the reactants in the oxidation and reduction processes for solar fuel generation. In order to understand photocatalytic processes through theoretical methods one must go beyond theoretical descriptions of the static molecular end electronic structure, because the nuclear and electronic interactions leading to chemistry are strongly coupled. We propose to carry out ab initio theoretical investigations on dynamics of photogenerated holes and electrons based on time-dependent nonadiabatic molecular dynamics (NAMD) method. We will focus on the H2O/TiO2, CH3OH/TiO2 and CO2/TiO2 chemisorption systems, which are tractable by theory and for which extensive chemical, STM, and time-resolved two photon photoemission (TR-2PP) studies exist. We plan to study the interfacial transfer and decay dynamics of photogenerated carriers. The coupling with phonons and proton transfer will be also investigated. The proposed theoretical research will couple strongly with the ongoing TR-2PP spectroscopy experiments at the University of Pittsburgh. The research on photocatalytic processes at metal oxide surfaces is directed to the clean and sustainable energy generation, environmental remediation, and climate change. The research addresses CESD goals to 1) strengthen model representations of energy and other human systems such as dynamic emissions; 2) advance understanding and process representation of the couplings involving energy, carbon, and water cycles; and 3) to use of EMSL high-performance computing to characterization and understanding of the experimental and theoretical basis of molecular-level reactions that occur in energy transduction and carbon recapture systems. The results of the proposed research are likely to have an impact on the fundamental molecular science for reducing the human impact on global climate and environment.
For the proposed NAMD simulations, usually we need to perform an ab initio molecular dynamics calculation up to 10 ps, which means 10,000 steps of electronic structure optimization. And for different structures and initial conditions, we need to perform many such calculations. Therefore, we believe the supercomputing facilities at EMSL are essential for our large scale computing needs. Neither PI has in-house computing facilities that could accomplish the proposed research. We request 150,000 node-hrs computing time on the Cascade supercomputer for the planned theoretical studies.
Project Details
Project type
Large-Scale EMSL Research
Start Date
2015-10-01
End Date
2017-09-30
Status
Closed
Released Data Link
Team
Principal Investigator
Co-Investigator(s)
Team Members
Related Publications
Ultrafast Plasmon-Enhanced Hot Electron Generation at Ag Nanocluster/Graphite Heterojunctions
Tan S., L. Liu, Y. Dai, J. Ren, J. Zhao, and H. Petek. 2017. "Ultrafast Plasmon-Enhanced Hot Electron Generation at Ag Nanocluster/Graphite Heterojunctions." Journal of the American Chemical Society. doi:10.1021/jacs.7b01079
Tuning Solvated Electrons by Polar–Nonpolar Oxide Heterostructure
Wang Y., H. Guo, Q. Zheng, W.A. Al-Saidi, and J. Zhao. 2018. "Tuning Solvated Electrons by Polar-Nonpolar Oxide Heterostructure." Journal of Physical Chemistry Letters 9, no. 11:3049–3056. doi:10.1021/acs.jpclett.8b00938
Phonon-coupled ultrafast interlayer charge oscillation at van der Waals heterostructure interfaces
Zheng Q., Y. Xie, Z. Lan, O. Prezhdo, W.A. Al-Saidi, and J. Zhao. 2018. "Phonon-coupled Ultrafast Interlayer Charge Oscillation at Van der Waals Heterostructure Interfaces." Physical Review B 97. doi:10.1103/PhysRevB.97.205417
Structures of defects on anatase TiO2(001) surfaces
Shi Y., H. Sun, M. Nguyen, C. Wang, K. Ho, W.A. Al-Saidi, and J. Zhao. 2017. "Structures of Defects on Anatase TiO2(001) Surfaces." Nanoscale 9, no. 32:11553. doi:10.1039/c7nr02458d
Role of Surface Stress on the Reactivity of Anatase TiO2(001)
Shi Y., H. Sun, W.A. Al-Saidi, M. Nguyen, C. Wang, K. Ho, and J. Yang, et al. 2017. "Role of Surface Stress on the Reactivity of Anatase TiO2(001)." Journal of Physical Chemistry Letters 8, no. 8:1764–1771. doi:10.1021/acs.jpclett.7b00181
Plasmonic coupling at a metal/semiconductor interface
Tan S., A. Argondizzo, J. Ren, L. Liu, J. Zhao, and H. Petek. 2017. "Plasmonic Coupling at a Metal/Semiconductor Interface." Nature Photonics 11. doi:10.1038/s41566-017-0049-4
Coherent Electron Transfer at the Ag/Graphite Heterojunction Interface
Tan S., Y. Dai, S. Zhang, L. Liu, J. Zhao, and H. Petek. 2018. "Coherent Electron Transfer at the Ag/Graphite Heterojunction Interface." Physical Review Letters 120. doi:10.1103/PhysRevLett.120.126801
Delocalized Impurity Phonon Induced Electron–Hole Recombination in Doped Semiconductors
Zhang L., Q. Zheng, Y. Xie, Z. Lan, O. Prezhdo, W.A. Al-Saidi, and J. Zhao. 2018. "Delocalized Impurity Phonon Induced Electron-Hole Recombination in Doped Semiconductors." Nano Letters 18, no. 3:1592–1599. doi:10.1021/acs.nanolett.7b03933
Ab initio nonadiabatic molecular dynamics investigation on the dynamics of photogenerated spin hole current in Cu-doped MoS2
Zhao C., Q. Zheng, J. Wu, and J. Zhao. 2017. "Ab Initio Nonadiabatic Molecular Dynamics Investigation on the Dynamics of Photogenerated Spin Hole Current in Cu-doped MoS2." Physical Review B 96, no. 13:134308. doi:10.1103/PhysRevB.96.134308
Phonon-Assisted Ultrafast Charge Transfer at van der Waals Heterostructure Interface
Zheng Q., W.A. Al-Saidi, Y. Xie, Z. Lan, O. Prezhdo, H. Petek, and J. Zhao. 2017. "Phonon-Assisted Ultrafast Charge Transfer at van der Waals Heterostructure Interface." Nano Letters 17, no. 10:6435–6442. doi:10.1021/acs.nanolett.7b03429
Tunability of the two-dimensional electron gas at the LaAlO3/SrTiO3 interface by strain-induced ferroelectricity
Guo H ,Al-Saidi W A,Zhao J 2016. "Tunability of the Two-dimensional Electron Gas at the LaAlO3/SrTiO3 Interface by Strain-induced Ferroelectricity" Physical Chemistry Chemical Physics. PCCP 18(41):28474-28484. 10.1039/C6CP04769F
Half-metallicity in 2D organometallic honeycomb frameworks
Sun H ,Li B ,Zhao J 2016. "Half-metallicity in 2D Organometallic Honeycomb Frameworks" Journal of Physics: Condensed Matter 28():425301. 10.1088/0953-8984/28/42/425301
New family of Dirac and Weyl semimetals in XAuTe (X = Na, K, Rb) ternary honeycomb compounds
Sun H ,Zhao J 2016. "New Family of Dirac and Weyl Semimetals in XAuTe (X = Na, K, Rb) Ternary Honeycomb Compounds" Science China. Physics, Mechanics & Astronomy 59():107011. 10.1007/s11433-016-0174-6
Ultrafast Dynamics of Photongenerated Holes at a CH3OH/TiO2 Rutile Interface
Chu W ,Al-Saidi W A,Zheng Q ,Xie Y ,Lan Z ,Prezhdo O ,Petek H ,Zhao J 2016. "Ultrafast Dynamics of Photongenerated Holes at a CH3OH/TiO2 Rutile Interface" Journal of the American Chemical Society 138(41):13740–13749. 10.1021/jacs.6b08725
Formaldehyde adsorption and decomposition on rutile (110): A first-principles study
Liu L ,Zhao J 2016. "Formaldehyde Adsorption and Decomposition on Rutile (110): A First-Principles Study" Surface Science 62():156–162. 10.1016/j.susc.2015.12.036
Oxidation of Anatase TiO2(001) (1×4) Surface
Chen KD, Y Shi, and J Zhao. 2015. "Oxidation of Anatase TiO2(001) (1x4) Surface." Chinese Journal of Chemical Physics 28(6):664. doi:10. 1063/1674-0068/28/cjcp1505095
Nano-scale polar–nonpolar oxide heterostructures for photocatalysis
Guo H, WA Al-Saidi, J Yang, and J Zhao. 2016. "Nano-scale Polar–nonpolar Oxide Heterostructures for Photocatalysis." Nanoscale 8(11):6057-6063. doi:10. 1039/c5nr08689b