CO Adsorbate Promotes Polaron Photoactivity on the Reduced Rutile TiO 2 (110) Surface
Abstract
Polarons play a major role in determining the chemical properties of transitionmetal oxides. Recent experiments show that adsorbates can attract inner polarons to surface sites. These findings require an atomistic understanding of the adsorbate influence on polaron dynamics and lifetime. We consider reduced rutile TiO2(110) with an oxygen vacancy as a prototypical surface and a CO molecule as a classic probe and perform ab initio adiabatic molecular dynamics, time-domain density functional theory, and nonadiabatic molecular dynamics simulations. The simulations show that subsurface polarons have little influence on CO adsorption and CO can desorb easily. On the contrary, surface polarons strongly enhance CO adsorption. At the same time, the adsorbed CO attracts polarons to the surface, allowing them to participate in catalytic processes with CO. The CO interaction with polarons changes their orbital origin, suppresses polaron hopping, and stabilizes them at surface sites. Partial delocalization of polarons onto CO decouples them from free holes, decreasing the nonadiabatic coupling and shortening the quantum coherence time, thereby reducing charge recombination. The calculations demonstrate that CO prefers to adsorb at the next-nearest-neighbor five-coordinated Ti3+ surface electron polaron sites. The reported results provide a fundamental understanding of the influence of electron polarons on the initialmore »
- Authors:
-
- College of Chemistry, Key Laboratory of Theoretical and Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, P.R. China
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
- Publication Date:
- Research Org.:
- Beijing Normal Univ. (China)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1837785
- Alternate Identifier(s):
- OSTI ID: 1841680
- Grant/Contract Number:
- SC0014429
- Resource Type:
- Published Article
- Journal Name:
- JACS Au
- Additional Journal Information:
- Journal Name: JACS Au Journal Volume: 2 Journal Issue: 1; Journal ID: ISSN 2691-3704
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; TiO2; polaron; adsorbate−polaron interaction; electron−hole recombination; nonadiabatic molecular dynamics; time-dependent density functional theory; oxides; adsorption; molecules; electrical energy
Citation Formats
Cheng, Cheng, Zhu, Yonghao, Fang, Wei-Hai, Long, Run, and Prezhdo, Oleg V. CO Adsorbate Promotes Polaron Photoactivity on the Reduced Rutile TiO 2 (110) Surface. United States: N. p., 2021.
Web. doi:10.1021/jacsau.1c00508.
Cheng, Cheng, Zhu, Yonghao, Fang, Wei-Hai, Long, Run, & Prezhdo, Oleg V. CO Adsorbate Promotes Polaron Photoactivity on the Reduced Rutile TiO 2 (110) Surface. United States. https://doi.org/10.1021/jacsau.1c00508
Cheng, Cheng, Zhu, Yonghao, Fang, Wei-Hai, Long, Run, and Prezhdo, Oleg V. Thu .
"CO Adsorbate Promotes Polaron Photoactivity on the Reduced Rutile TiO 2 (110) Surface". United States. https://doi.org/10.1021/jacsau.1c00508.
@article{osti_1837785,
title = {CO Adsorbate Promotes Polaron Photoactivity on the Reduced Rutile TiO 2 (110) Surface},
author = {Cheng, Cheng and Zhu, Yonghao and Fang, Wei-Hai and Long, Run and Prezhdo, Oleg V.},
abstractNote = {Polarons play a major role in determining the chemical properties of transitionmetal oxides. Recent experiments show that adsorbates can attract inner polarons to surface sites. These findings require an atomistic understanding of the adsorbate influence on polaron dynamics and lifetime. We consider reduced rutile TiO2(110) with an oxygen vacancy as a prototypical surface and a CO molecule as a classic probe and perform ab initio adiabatic molecular dynamics, time-domain density functional theory, and nonadiabatic molecular dynamics simulations. The simulations show that subsurface polarons have little influence on CO adsorption and CO can desorb easily. On the contrary, surface polarons strongly enhance CO adsorption. At the same time, the adsorbed CO attracts polarons to the surface, allowing them to participate in catalytic processes with CO. The CO interaction with polarons changes their orbital origin, suppresses polaron hopping, and stabilizes them at surface sites. Partial delocalization of polarons onto CO decouples them from free holes, decreasing the nonadiabatic coupling and shortening the quantum coherence time, thereby reducing charge recombination. The calculations demonstrate that CO prefers to adsorb at the next-nearest-neighbor five-coordinated Ti3+ surface electron polaron sites. The reported results provide a fundamental understanding of the influence of electron polarons on the initial stage of reactant adsorption and the effect of the adsorbate–polaron interaction on the polaron dynamics and lifetime. The study demonstrates how charge and polaron properties can be controlled by adsorbed species, allowing one to design high-performance transition-metal oxide catalysts.},
doi = {10.1021/jacsau.1c00508},
journal = {JACS Au},
number = 1,
volume = 2,
place = {United States},
year = {Thu Dec 30 00:00:00 EST 2021},
month = {Thu Dec 30 00:00:00 EST 2021}
}
https://doi.org/10.1021/jacsau.1c00508
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