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Wang L, Liu X, Wan L, Gao Y, Wang X, Liu J, Tan S, Guo Q, Zhao W, Hu W, Li Q, Yang J. Excitonic Effects of the Excited-State Photocatalytic Reaction at the Molecule/Metal Oxide Interface. J Phys Chem Lett 2024; 15:2096-2104. [PMID: 38358755 DOI: 10.1021/acs.jpclett.3c03075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
Excitonic effects caused by the Coulomb interaction between electrons and holes play a crucial role in photocatalysis at the molecule/metal oxide interface. As an ideal model for investigating the excitonic effect, coadsorption and photodissociation of water and methanol molecules on titanium dioxide involve complex ground-state thermalcatalytic and excited-state photocatalytic reaction processes. Herein, we systemically investigate the excited-state electronic structures of the coadsorption of H2O and CH3OH molecules on a rutile TiO2(110) surface by linear-response time-dependent density functional theory calculations and probe the reaction path for generating HCOOH or CO2, from ground-state and excited-state perspectives. The reaction barriers in excited-state calculations are significantly different from those in ground-state calculations during three processes, with the largest decrease being 0.94 eV for the Ti5c-O-CH2-O-Ti5c formation process.
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Affiliation(s)
- Lei Wang
- Department of Chemical Physics, and Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiaofeng Liu
- School of Physics, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Lingyun Wan
- Hefei National Research Center for Physical Sciences at the Microscale and Hefei National Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yunzhi Gao
- Hefei National Research Center for Physical Sciences at the Microscale and Hefei National Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiaoning Wang
- Department of Chemical Physics, and Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jie Liu
- Hefei National Research Center for Physical Sciences at the Microscale and Hefei National Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Shijing Tan
- Hefei National Research Center for Physical Sciences at the Microscale and Hefei National Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Qing Guo
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Wenhui Zhao
- Department of Physics, Ningbo University, Ningbo, Zhejiang 315211, China
| | - Wei Hu
- Hefei National Research Center for Physical Sciences at the Microscale and Hefei National Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Qunxiang Li
- Department of Chemical Physics, and Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jinlong Yang
- Department of Chemical Physics, and Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
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Zhu HY, Li QS. Theoretical Understanding on the Facilitated Photoisomerization of a Carbonyl Supported Borane System. Chemphyschem 2023:e202300435. [PMID: 37646234 DOI: 10.1002/cphc.202300435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 08/29/2023] [Accepted: 08/30/2023] [Indexed: 09/01/2023]
Abstract
Boron compound BOMes2 containing an internal B-O bond undergoes highly efficient photoisomerization, followed by sequential structural transformations, resulting in a rare eight-membered B, O-heterocycle (S. Wang, et al. Org. Lett. 2019, 21, 5285-5289). In this work, the detailed reaction mechanisms of such a unique carbonyl-supported tetracoordinate boron system in the first excited singlet (S1 ) state and the ground (S0 ) state were investigated by using the complete active space self-consistent field and its second-order perturbation (MS-CASPT2//CASSCF) method combined with time-dependent density functional theory (TD-DFT). Moreover, an imine-substituted tetracoordinated organic boron system (BNMes2 ) was selected for comparative study to explore the intrinsic reasons for the difference in reactivity between the two types of compounds. Steric factor was found to influence the photoisomerization activity of BNMes2 and BOMes2 . These results rationalize the experimental observations and can provide helpful insights into understanding the excited-state dynamics of heteroatom-doped tetracoordinate organoboron compounds, which facilitates the rational design of boron-based materials with superior photoresponsive performances.
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Affiliation(s)
- Hong-Yang Zhu
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing, P. R. China
| | - Quan-Song Li
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing, P. R. China
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3
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Morales-García Á, Viñes F, Sousa C, Illas F. Toward a Rigorous Theoretical Description of Photocatalysis Using Realistic Models. J Phys Chem Lett 2023; 14:3712-3720. [PMID: 37042213 PMCID: PMC10123813 DOI: 10.1021/acs.jpclett.3c00359] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 03/22/2023] [Indexed: 06/19/2023]
Abstract
This Perspective aims at providing a road map to computational heterogeneous photocatalysis highlighting the knowledge needed to boost the design of efficient photocatalysts. A plausible computational framework is suggested focusing on static and dynamic properties of the relevant excited states as well of the involved chemistry for the reactions of interest. This road map calls for explicitly exploring the nature of the charge carriers, the excited-state potential energy surface, and its time evolution. Excited-state descriptors are introduced to locate and characterize the electrons and holes generated upon excitation. Nonadiabatic molecular dynamics simulations are proposed as a convenient tool to describe the time evolution of the photogenerated species and their propagation through the crystalline structure of photoactive material, ultimately providing information about the charge carrier lifetime. Finally, it is claimed that a detailed understanding of the mechanisms of heterogeneously photocatalyzed reactions demands the analysis of the excited-state potential energy surface.
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Yu F, Wang X, Lu H, Li G, Liao B, Wang H, Duan C, Mao Y, Chen L. Surface Engineering of TiO 2 Nanosheets to Boost Photocatalytic Methanol Dehydrogenation for Hydrogen Evolution. Inorg Chem 2023; 62:5700-5706. [PMID: 36966515 DOI: 10.1021/acs.inorgchem.3c00250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2023]
Abstract
Low-cost high-efficiency H2 evolution is indispensable for its large-scale applications in the future. In the research, we expect to build high active photocatalysts for sunlight-driven H2 production by surface engineering to adjust the work function of photocatalyst surfaces, adsorption/desorption ability of substrates and products, and reaction activation energy barrier. Single-atom Pt-doped TiO2-x nanosheets (NSs), mainly including two facets of (001) and (101), with loading of Pt nanoparticles (NPs) at their edges (Pt/TiO2-x-SAP) are successfully prepared by an oxygen vacancy-engaged synthetic strategy. According to the theoretical simulation, the implanted single-atom Pt can change the surface work function of TiO2, which benefits electron transfer, and electrons tend to gather at Pt NPs adsorbed at (101) facet-related edges of TiO2 NSs for H2 evolution. Pt/TiO2-x-SAP exhibits ultrahigh photocatalytic performance of hydrogen evolution from dry methanol with a quantum yield of 90.8% that is ∼1385 times higher than pure TiO2-x NSs upon 365 nm light irradiation. The high H2 generation rate (607 mmol gcata-1 h-1) of Pt/TiO2-x-SAP is the basis for its potential applications in the transportation field with irradiation of UV-visible light (100 mW cm-2). Finally, lower adsorption energy for HCHO on Ti sites originated from TiO2 (001) doping single-atom Pt is responsible for high selective dehydrogenation of methanol to HCHO, and H tends to favorably gather at Pt NPs on the TiO2 (101) surface to produce H2.
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Affiliation(s)
- Fengyang Yu
- Department of Pharmaceutical Engineering, Bengbu Medical College, Bengbu, Anhui 233030, P. R. China
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, Liaoning 116024, P. R. China
| | - Xiaohua Wang
- Department of Pharmaceutical Engineering, Bengbu Medical College, Bengbu, Anhui 233030, P. R. China
| | - Haiyue Lu
- Department of Pharmaceutical Engineering, Bengbu Medical College, Bengbu, Anhui 233030, P. R. China
| | - Gen Li
- Department of Pharmaceutical Engineering, Bengbu Medical College, Bengbu, Anhui 233030, P. R. China
| | - Baicheng Liao
- Department of Pharmaceutical Engineering, Bengbu Medical College, Bengbu, Anhui 233030, P. R. China
| | - Hanqing Wang
- Hunan Engineering Research Centre of Full Life-cycle Energy-efficient Buildings and Environmental Health, Central South University of Forestry and Technology, Changsha, Hunan 410004, P. R. China
| | - Chunying Duan
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, Liaoning 116024, P. R. China
| | - Yu Mao
- Hunan Engineering Research Centre of Full Life-cycle Energy-efficient Buildings and Environmental Health, Central South University of Forestry and Technology, Changsha, Hunan 410004, P. R. China
| | - Liyong Chen
- Department of Pharmaceutical Engineering, Bengbu Medical College, Bengbu, Anhui 233030, P. R. China
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, Liaoning 116024, P. R. China
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Fabrication of nitrogen doped TiO 2/Fe 2O 3 nanostructures for photocatalytic oxidation of methanol based wastewater. Sci Rep 2023; 13:4431. [PMID: 36932149 PMCID: PMC10023745 DOI: 10.1038/s41598-023-31625-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 03/14/2023] [Indexed: 03/19/2023] Open
Abstract
An important industrial process that often occurs on the surface of a heterogeneous catalyst using thermochemical or photochemical could help in the oxidation of methanol-based wastewater to formaldehyde. Titania-based photocatalysts have drawn a lot of interest from scientists because they are a reliable and affordable catalyst material for photocatalytic oxidation processes in the presence of light energy. In this study, a straight-forward hydrothermal method for producing n-TiO2@α-Fe2O3 composite photocatalysts and hematite (α-Fe2O3) nanocubes has been done. By adjusting the ratio of n-TiO2 in the prepared composite photocatalysts, the enhancing influence of the nitrogen-doped titania on the photocatalytic characteristics of the prepared materials was investigated. The prepared materials were thoroughly characterized using common physiochemical methods, such as transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX), X-ray photoelectrons spectroscopy (XPS), physisorption (BET), and others, in order to learn more about the structure The results obtained showed that nitrogen-doped titania outperforms non-doped titania for methanol photooxidation. The addition of nitrogen-doped titania to their surfaces resulted in an even greater improvement in the photooxidation rates of the methanol coupled with hematite. The photooxidation of methanol in the aqueous solution to simulate its concentration in the wastewater has been occurred. After 3 h, the four weight percent of n-TiO2@α-Fe2O3 photocatalyst showed the highest rate of HCHO production.
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Wang B, Ding Y, Yin S, Cai M. A DFT Study on the Mechanism of Active Species in Selective Photocatalytic Oxidation of Toluene into Benzaldehyde on (WO
3
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3
Clusters. ChemistrySelect 2022. [DOI: 10.1002/slct.202203173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Bin Wang
- Hunan Provincial Key Laboratory of High-Energy Scale Physics and Applications School of Physics and Electronics Science Hunan University Changsha 410082 P. R. China
| | - Yu‐Feng Ding
- Hunan Provincial Key Laboratory of High-Energy Scale Physics and Applications School of Physics and Electronics Science Hunan University Changsha 410082 P. R. China
| | - Shuang‐Feng Yin
- Advanced Catalytic Engineering Research Center of the Ministry of Education State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions Hunan University Changsha 410082 Hunan Province P. R. China
| | - Meng‐Qiu Cai
- Hunan Provincial Key Laboratory of High-Energy Scale Physics and Applications School of Physics and Electronics Science Hunan University Changsha 410082 P. R. China
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7
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Palma B, Cheng X, Liu L, Zhong N, Zhao H, Renneckar S, Larter S, Kibria M, Hu J. Visible‐light Driven Lignin Valorization into Value‐added Chemicals and Sustainable Hydrogen Using Zn1‐xCdxS Solid Solutions as Photocatalyst. CHEMPHOTOCHEM 2022. [DOI: 10.1002/cptc.202200193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Bruna Palma
- University of Calgary Schulich School of Engineering Chemical and Petroleum Engineering CANADA
| | - Xi Cheng
- University of Calgary Chemical and Petroleum Engineering CANADA
| | - Liyang Liu
- The University of British Columbia Department of Wood Science CANADA
| | - Na Zhong
- University of Calgary Department of Chemical and Petroleum Engineering CANADA
| | - Heng Zhao
- University of Calgary Chemical and Petroleum Engineering 3535 Research RD NW T2L 2K8 Calgary CANADA
| | - Scott Renneckar
- The University of British Columbia Department of Wood Science CANADA
| | | | - Md Kibria
- University of Calgary Department of Chemical and Petroleum Engineering CANADA
| | - Jinguang Hu
- University of Calgary Chemical and Petroleum Engineering CANADA
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8
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Zhang X, Ma H, Zhang M, Ma Y. Interfacial Charge-Transfer Excitons Help the Photoreduction of CO 2 on TiO 2. ACS Catal 2022. [DOI: 10.1021/acscatal.2c03795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiao Zhang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China
| | - Huizhong Ma
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China
| | - Min Zhang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China
| | - Yuchen Ma
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China
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9
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Chu W, Tan S, Zheng Q, Fang W, Feng Y, Prezhdo OV, Wang B, Li XZ, Zhao J. Ultrafast charge transfer coupled to quantum proton motion at molecule/metal oxide interface. SCIENCE ADVANCES 2022; 8:eabo2675. [PMID: 35714193 DOI: 10.1126/sciadv.abo2675] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Understanding how the nuclear quantum effects (NQEs) in the hydrogen bond (H-bond) network influence the photoexcited charge transfer at semiconductor/molecule interface is a challenging problem. By combining two kinds of emerging molecular dynamics methods at the ab initio level, the path integral-based molecular dynamics and time-dependent nonadiabatic molecular dynamics, and choosing CH3OH/TiO2 as a prototypical system to study, we find that the quantum proton motion in the H-bond network is strongly coupled with the ultrafast photoexcited charge dynamics at the interface. The hole trapping ability of the adsorbed methanol molecule is notably enhanced by the NQEs, and thus, it behaves as a hole scavenger on titanium dioxide. The critical role of the H-bond network is confirmed by in situ scanning tunneling microscope measurements with ultraviolet light illumination. It is concluded the quantum proton motion in the H-bond network plays a critical role in influencing the energy conversion efficiency based on photoexcitation.
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Affiliation(s)
- Weibin Chu
- Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
- Departments of Chemistry, and Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA
- Key Laboratory of Computational Physical Sciences (Ministry of Education), Institute of Computational Physical Sciences, Fudan University, Shanghai 200433, People's Republic of China
| | - Shijing Tan
- Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Qijing Zheng
- Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Wei Fang
- State Key Laboratory of Molecular Reaction Dynamics and Center for Theoretical Computational Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China
- Department of Chemistry, Fudan University, Shanghai 200438, People's Republic of China
- Laboratory of Physical Chemistry, ETH Zurich, CH-8093 Zürich, Switzerland
| | - Yexin Feng
- School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China
| | - Oleg V Prezhdo
- Departments of Chemistry, and Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA
| | - Bing Wang
- Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Xin-Zheng Li
- Interdisciplinary Institute of Light-Element Quantum Materials, Research Center for Light-Element Advanced Materials, State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Frontier Science Center for Nano-optoelectronics and School of Physics, Peking University, Beijing 100871, People's Republic of China
- Peking University Yangtze Delta Institute of Optoelectronics, Nantong, Jiangsu 226010, People's Republic of China
| | - Jin Zhao
- Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
- Hefei National Laboratory, Hefei 230088, People's Republic of China
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Sun R, Liu X, Chen X, Che L, Yang X, Guo Q. One-Pot Ethyl Acetate Production from Ethanol Photooxidation on Rutile TiO 2(110): Strong Photon Energy Dependence. J Phys Chem Lett 2022; 13:801-807. [PMID: 35044191 DOI: 10.1021/acs.jpclett.2c00048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Ethyl acetate (EA) production from sequential ethanol (EtOH) photooxidation on a rutile(R)-TiO2(110) surface has been investigated by the temperature-programmed desorption (TPD) method at 355 and 266 nm. Significant EA product is detected under 266 nm irradiation, which is most likely to be formed via cross-coupling of primary dissociation products, aldehyde (CH3CHO) and ethoxy groups. On the contrary, EA formation at 355 nm is negligible. In addition, the initial rate of EA formation from EtOH at 266 nm is nearly 2 orders of magnitude faster than that at 355 nm. Quantitative analysis suggests that EA formation from sequential EtOH photooxidation on R-TiO2(110) is strongly dependent on photon energy or the energy of hot holes. This experimental result raises doubt about the traditional photocatalysis model on TiO2 where charge carriers relax to their respective band edges prior to charge transfer to adsorbates during the photocatalytic process, leading to no dependence on photon energy in TiO2 photocatalysis.
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Affiliation(s)
- Rulin Sun
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian, Liaoning 116026, People's Republic of China
| | - Xinlu Liu
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian, Liaoning 116026, People's Republic of China
| | - Xiao Chen
- Shenzhen Key Laboratory of Energy Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People's Republic of China
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People's Republic of China
| | - Li Che
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian, Liaoning 116026, People's Republic of China
| | - Xueming Yang
- Shenzhen Key Laboratory of Energy Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People's Republic of China
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, People's Republic of China
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People's Republic of China
| | - Qing Guo
- Shenzhen Key Laboratory of Energy Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People's Republic of China
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People's Republic of China
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Kang Y, Wang Z, Shi Y, Guo B, Wu L. Synthesis of aluminum doped MIL-100(Fe) compounds for the one-pot photocatalytic conversion of cinnamaldehyde and benzyl alcohol to the corresponding alcohol and aldehyde under anaerobic conditions. J Catal 2022. [DOI: 10.1016/j.jcat.2022.01.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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12
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Yu F, Chen L, Li X, Shen X, Zhao H, Duan C, Chen Q. Cu Nanocluster-Loaded TiO 2 Nanosheets for Highly Efficient Generation of CO-Free Hydrogen by Selective Photocatalytic Dehydrogenation of Methanol to Formaldehyde. ACS APPLIED MATERIALS & INTERFACES 2021; 13:18619-18626. [PMID: 33848135 DOI: 10.1021/acsami.0c20116] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Safe storage and transportation of H2 is a fundamental requirement for its wide applications in the future. Controllable release of high-purity H2 from a stable storage medium such as CH3OH before use offers an efficient way of achieving this purpose. In our case, Cu nanoclusters uniformly dispersed onto (001) surfaces of TiO2 nanosheets (TiO2/Cu) are selectively prepared by thermal treatment of HKUST-1 loaded TiO2 nanosheets. One of the TiO2/Cu composites, TiO2/Cu_50, exhibits remarkably high activity toward the selective dehydrogenation of CH3OH to HCHO with a H2 evolution rate of 17.8 mmol h-1 per gram of catalyst within a 16-h photocatalytic reaction (quantum efficiency at 365 nm: 16.4%). Theoretical calculations reveal that interactions of Cu nanoclusters with TiO2 could affect their electronic structures, leading to higher adsorption energy of CH3OH at Ti sites and a lower barrier for the dehydrogenation of CH3OH by the synergistic effect of Cu nanoclusters and TiO2, and lower Gibbs free energy for desorption HCHO and H2 as well.
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Affiliation(s)
- Fengyang Yu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Liyong Chen
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Xuezhao Li
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Xiaoshuang Shen
- School of Physical Science & Technology, Yangzhou University, Yangzhou 225002, P. R. China
| | - He Zhao
- Division of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China
| | - Chunying Duan
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Qianwang Chen
- Hefei National Laboratory for Physical Science at Microscale, Department of Materials Science & Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
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Zhang Z, Wang M, Zhou H, Wang F. Surface Sulfate Ion on CdS Catalyst Enhances Syngas Generation from Biopolyols. J Am Chem Soc 2021; 143:6533-6541. [DOI: 10.1021/jacs.1c00830] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Zhe Zhang
- Zhang Dayu School of Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, P. R. China
| | - Min Wang
- Zhang Dayu School of Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, P. R. China
| | - Hongru Zhou
- Zhang Dayu School of Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, P. R. China
| | - Feng Wang
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning P. R. China
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Abstract
Photoinduced charge transport in lithium niobate for standard illumination, composition and temperature conditions occurs by means of small polaron hopping either on regular or defective lattice sites. Starting from Marcus-Holstein’s theory for polaron hopping frequency we draw a quantitative picture illustrating two underlying microscopic mechanisms besides experimental observations, namely direct trapping and migration-accelerated polaron trapping transport. Our observations will be referred to the typical outcomes of transient light induced absorption measurements, where the kinetics of a polaron population generated by a laser pulse then decaying towards deep trap sites is measured. Our results help to rationalize the observations beyond simple phenomenological models and may serve as a guide to design the material according to the desired specifications.
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Xu C, Xu F, Chen X, Li Z, Luan Z, Wang X, Guo Q, Yang X. Wavelength-Dependent Water Oxidation on Rutile TiO 2(110). J Phys Chem Lett 2021; 12:1066-1072. [PMID: 33470822 DOI: 10.1021/acs.jpclett.0c03726] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Understanding the microscopic mechanism of water photocatalysis on TiO2 is of great value in energy chemistry and catalysis. To date, it is still unclear how water photocatalysis occurs after the initial light absorption. Here we report the investigation of the photoinduced water dissociation and desorption on a R-TiO2(110) surface, at different wavelengths (from 250 to 330 nm), using temperature-programmed desorption and time-of-flight techniques. Primary photooxidation products, gas phase OH radicals and surface H atoms, were clearly observed at wavelengths of ≤290 nm. As the laser wavelength decreases from 290 to 250 nm, the relative yield of H2O oxidation increases significantly. Likewise, photoinduced H2O desorption was also observed in the range of 320-250 nm, and the relative yield of H2O desorption also increases with a decrease in wavelength. The strong wavelength-dependent H2O photooxidation and photodesorption suggest that the energy of charge carriers is important in these two processes. More importantly, the result raises doubt about the widely accepted photocatalysis model of TiO2 in which the excess energy of charge carriers is useless for photocatalysis. In addition, the H2O photooxidation is more likely initiated by nonthermalized holes and is accomplished on the ground state potential energy surface via a non-adiabatic decay process.
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Affiliation(s)
- Chenbiao Xu
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Zhongshan Road 457, Dalian 116023, Liaoning, P. R. China
| | - Fei Xu
- Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, Anhui, P. R. China
| | - Xiao Chen
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China
| | - Zhenxing Li
- Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, Anhui, P. R. China
| | - Zhiwen Luan
- Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, Anhui, P. R. China
| | - Xingan Wang
- Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, Anhui, P. R. China
| | - Qing Guo
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China
| | - Xueming Yang
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Zhongshan Road 457, Dalian 116023, Liaoning, P. R. China
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16
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Wang H, Jin S, Zhang X, Xie Y. Excitonic Effects in Polymeric Photocatalysts. Angew Chem Int Ed Engl 2020; 59:22828-22839. [DOI: 10.1002/anie.202002241] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Indexed: 12/31/2022]
Affiliation(s)
- Hui Wang
- Hefei National Laboratory for Physical Sciences at the Microscale CAS Centre for Excellence in Nanoscience University of Science and Technology of China Hefei Anhui 230026 P. R. China
- Institute of Energy Hefei Comprehensive National Science Center Hefei Anhui 230031 P. R. China
| | - Sen Jin
- Hefei National Laboratory for Physical Sciences at the Microscale CAS Centre for Excellence in Nanoscience University of Science and Technology of China Hefei Anhui 230026 P. R. China
| | - Xiaodong Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale CAS Centre for Excellence in Nanoscience University of Science and Technology of China Hefei Anhui 230026 P. R. China
- Institute of Energy Hefei Comprehensive National Science Center Hefei Anhui 230031 P. R. China
| | - Yi Xie
- Hefei National Laboratory for Physical Sciences at the Microscale CAS Centre for Excellence in Nanoscience University of Science and Technology of China Hefei Anhui 230026 P. R. China
- Institute of Energy Hefei Comprehensive National Science Center Hefei Anhui 230031 P. R. China
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17
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Affiliation(s)
- Hui Wang
- Hefei National Laboratory for Physical Sciences at the Microscale CAS Centre for Excellence in Nanoscience University of Science and Technology of China Hefei Anhui 230026 P. R. China
- Institute of Energy Hefei Comprehensive National Science Center Hefei Anhui 230031 P. R. China
| | - Sen Jin
- Hefei National Laboratory for Physical Sciences at the Microscale CAS Centre for Excellence in Nanoscience University of Science and Technology of China Hefei Anhui 230026 P. R. China
| | - Xiaodong Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale CAS Centre for Excellence in Nanoscience University of Science and Technology of China Hefei Anhui 230026 P. R. China
- Institute of Energy Hefei Comprehensive National Science Center Hefei Anhui 230031 P. R. China
| | - Yi Xie
- Hefei National Laboratory for Physical Sciences at the Microscale CAS Centre for Excellence in Nanoscience University of Science and Technology of China Hefei Anhui 230026 P. R. China
- Institute of Energy Hefei Comprehensive National Science Center Hefei Anhui 230031 P. R. China
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18
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Wang H, Liu W, Jin S, Zhang X, Xie Y. Low-Dimensional Semiconductors in Artificial Photosynthesis: An Outlook for the Interactions between Particles/Quasiparticles. ACS CENTRAL SCIENCE 2020; 6:1058-1069. [PMID: 32724841 PMCID: PMC7379106 DOI: 10.1021/acscentsci.0c00540] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Indexed: 06/11/2023]
Abstract
By virtue of their intriguing electronic structures and excellent surface properties, low-dimensional semiconductors hold great promise in the field of solar-driven artificial photosynthesis. However, owing to promoted structural confinement and reduced Coulomb screening, remarkable interactions between particles/quasiparticles, including electrons, holes, phonons, and excitons, can be expected in low-dimensional semiconductors, which endow the systems with distinctive excited-state properties that are distinctly different from those in the bulk counterparts. Consequently, these interactions determine not only the mechanisms but also quantum yields of photosynthetic energy utilization. In this Outlook, we review recent advances in studying the unique interactions in low-dimensional semiconductor-based photocatalysts. By highlighting the relevance of different interactions to excited-state properties, we describe the impacts of the interactions on photosynthetic energy conversion. Furthermore, we summarize the regulation of these interactions for gaining optimized photosynthetic behaviors, where the relationships between these interactions and structural factors/external fields are elaborated. Additionally, the challenges and opportunities in studying the interaction-related photosynthesis are discussed.
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Affiliation(s)
- Hui Wang
- Hefei
National Laboratory for Physical Sciences at the Microscale, CAS Centre
for Excellence in Nanoscience, University
of Science and Technology of China, Hefei, Anhui 230026, P. R. China
- Institute
of Energy, Hefei Comprehensive National
Science Center, Hefei, Anhui 230031, P.
R. China
| | - Wenxiu Liu
- Hefei
National Laboratory for Physical Sciences at the Microscale, CAS Centre
for Excellence in Nanoscience, University
of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Sen Jin
- Hefei
National Laboratory for Physical Sciences at the Microscale, CAS Centre
for Excellence in Nanoscience, University
of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Xiaodong Zhang
- Hefei
National Laboratory for Physical Sciences at the Microscale, CAS Centre
for Excellence in Nanoscience, University
of Science and Technology of China, Hefei, Anhui 230026, P. R. China
- Institute
of Energy, Hefei Comprehensive National
Science Center, Hefei, Anhui 230031, P.
R. China
| | - Yi Xie
- Hefei
National Laboratory for Physical Sciences at the Microscale, CAS Centre
for Excellence in Nanoscience, University
of Science and Technology of China, Hefei, Anhui 230026, P. R. China
- Institute
of Energy, Hefei Comprehensive National
Science Center, Hefei, Anhui 230031, P.
R. China
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19
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Giret Y, Guo P, Wang LF, Cheng J. Theoretical study of kinetics of proton coupled electron transfer in photocatalysis. J Chem Phys 2020; 152:124705. [PMID: 32241134 DOI: 10.1063/5.0001825] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Photocatalysis induced by sunlight is one of the most promising approaches to environmental protection, solar energy conversion, and sustainable production of fuels. The computational modeling of photocatalysis is a rapidly expanding field that requires to adapt and to further develop the available theoretical tools. The coupled transfer of protons and electrons is an important reaction during photocatalysis. In this work, we present the first step of our methodology development in which we apply the existing kinetic theory of such coupled transfer to a model system, namely, methanol photodissociation on the rutile TiO2(110) surface, with the help of high-level first-principles calculations. Moreover, we adapt the Stuchebrukhov-Hammes-Schiffer kinetic theory, where we use the Georgievskii-Stuchebrukhova vibronic coupling to calculate the rate constant of the proton coupled electron transfer reaction for a particular pathway. In particular, we propose a modified expression to calculate the rate constant, which enforces the near-resonance condition for the vibrational wave function during proton tunneling.
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Affiliation(s)
- Yvelin Giret
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Pu Guo
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Li-Feng Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Jun Cheng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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20
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Rutile TiO2 supported single atom Au catalyst: A facile approach to enhance methanol dehydrogenation. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2019.110670] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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21
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Li Z, Ivanenko A, Meng X, Zhang Z. Photocatalytic oxidation of methanol to formaldehyde on bismuth-based semiconductors. JOURNAL OF HAZARDOUS MATERIALS 2019; 380:120822. [PMID: 31319333 DOI: 10.1016/j.jhazmat.2019.120822] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 06/24/2019] [Accepted: 06/25/2019] [Indexed: 06/10/2023]
Abstract
Methanol is widely applied in photocatalysis as a scavenger of holes, and is also studied as a model system for heterogeneous photocatalysis for the production of formaldehyde. Compared to commercial processes for formaldehyde production via thermal catalytic methanol oxidation, photocatalytic oxidation of methanol to formaldehyde may be more promising when considering the following aspects: 1) lower reaction temperature and pressure (generally operated at room temperature and ambient pressure); 2) lower cost of the energy source (such as solar light) and 3) easy-to-design reactive system. Photocatalytic methanol oxidation was carried out using four different bismuth-based semiconductors (BBS), Bi2WO6, Bi2MoO6, BiOBr and BiVO4, under varying system temperature (5-50 °C), bubbling speed (0.1-1.0 LPM), catalyst dosage (0.2-2.0 g/L), and initial methanol concentration (12.5-250 mM). It was found that the formaldehyde formation rate for all photocatalysts increased as a function of each of these system parameters. Of these four BBS, it was found that Bi2WO6 had the highest formaldehyde formation rate (0.081 mM/h). This work provides a new approach to produce formaldehyde using photocatalysis, and future work has also been proposed.
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Affiliation(s)
- Zizhen Li
- Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Anthony Ivanenko
- Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Xiangchao Meng
- Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
| | - Zisheng Zhang
- Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
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22
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Guo Q, Zhou C, Ma Z, Yang X. Fundamentals of TiO 2 Photocatalysis: Concepts, Mechanisms, and Challenges. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1901997. [PMID: 31423680 DOI: 10.1002/adma.201901997] [Citation(s) in RCA: 433] [Impact Index Per Article: 86.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 07/23/2019] [Indexed: 05/27/2023]
Abstract
Photocatalysis has been widely applied in various areas, such as solar cells, water splitting, and pollutant degradation. Therefore, the photochemical mechanisms and basic principles of photocatalysis, especially TiO2 photocatalysis, have been extensively investigated by various surface science methods in the last decade, aiming to provide important information for TiO2 photocatalysis under real environmental conditions. Recent progress that provides fundamental insights into TiO2 photocatalysis at a molecular level is highlighted. Insights into the structures of TiO2 and the basic principles of TiO2 photocatalysis are discussed first, which provides the basic concepts of TiO2 photocatalysis. Following this, details of the photochemistry of three important molecules (oxygen, water, methanol) on the model TiO2 surfaces are presented, in an attempt to unravel the relationship between charge/energy transfer and bond breaking/forming in TiO2 photocatalysis. Lastly, challenges and opportunities of the mechanistic studies of TiO2 photocatalysis at the molecular level are discussed briefly, as well as possible photocatalysis models.
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Affiliation(s)
- Qing Guo
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
- Department of Chemistry, Southern University of Science and Technology, 1088 Xueyuan Avenue, Shenzhen, 518055, China
| | - Chuanyao Zhou
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
| | - Zhibo Ma
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
| | - Xueming Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
- Department of Chemistry, Southern University of Science and Technology, 1088 Xueyuan Avenue, Shenzhen, 518055, China
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23
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Guo Q, Ma Z, Zhou C, Ren Z, Yang X. Single Molecule Photocatalysis on TiO2 Surfaces. Chem Rev 2019; 119:11020-11041. [DOI: 10.1021/acs.chemrev.9b00226] [Citation(s) in RCA: 129] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Qing Guo
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, 457 Zhongshan Road, Dalian, Liaoning 116023, P. R. China
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China
| | - Zhibo Ma
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, 457 Zhongshan Road, Dalian, Liaoning 116023, P. R. China
| | - Chuanyao Zhou
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, 457 Zhongshan Road, Dalian, Liaoning 116023, P. R. China
| | - Zefeng Ren
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, 457 Zhongshan Road, Dalian, Liaoning 116023, P. R. China
| | - Xueming Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, 457 Zhongshan Road, Dalian, Liaoning 116023, P. R. China
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China
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24
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Katsiev K, Harrison G, Al-Salik Y, Thornton G, Idriss H. Gold Cluster Coverage Effect on H2 Production over Rutile TiO2(110). ACS Catal 2019. [DOI: 10.1021/acscatal.9b01890] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. Katsiev
- Fundamental Catalysis, SABIC-CRD at KAUST, Thuwal, Saudi Arabia
| | - G. Harrison
- Department of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Y. Al-Salik
- Fundamental Catalysis, SABIC-CRD at KAUST, Thuwal, Saudi Arabia
| | - G. Thornton
- Department of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - H. Idriss
- Fundamental Catalysis, SABIC-CRD at KAUST, Thuwal, Saudi Arabia
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25
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Sun H, Zheng Q, Lu W, Zhao J. Ultrafast dynamics of solvated electrons at anatase TiO 2/H 2O interface. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:114004. [PMID: 30625440 DOI: 10.1088/1361-648x/aafcf6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Solvated electrons are known to be the lowest energy charge transfer pathways at oxide/aqueous interface and the understanding of the electron transfer dynamics at the interface is fundamental for photochemical and photocatalytic processes. Taking anatase TiO2/H2O interface as a prototypical system, we perform time-dependent ab initio nonadiabatic molecular dynamics calculations to study the charge transfer dynamics of solvated electrons. For the static electronic properties, we find that the dangling H atoms can stabilize solvated electrons. A solvated electron band can be formed with one monolayer H2O adsorption. The energies of the solvated electron band minimum (SEBM) decrease when H2O adsorbs dissociatively. Moreover, the surface oxygen vacancies are also helpful for stabilizing the solvated electron band. For the dynamics behaviour, we find that the ultrafast charge transfer from SEBM to anatase TiO2 (1 0 1) surface at 100 K is mainly contributed by nonadiabatic mechanism. Comparing with rutile TiO2 (1 1 0) surface, the lifetime of solvated electron on anatase TiO2 (1 0 1) surface is longer, suggesting a better photocatalytic properties. Our results provide essential insights into the understanding of the charge transfer dynamics and the possible photocatalytic mechanism at oxide/aqueous interface.
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Affiliation(s)
- Huijuan Sun
- College of Physics and State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao, Shandong 266071, People's Republic of China
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26
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Messerschmidt S, Krampf A, Freytag F, Imlau M, Vittadello L, Bazzan M, Corradi G. The role of self-trapped excitons in polaronic recombination processes in lithium niobate. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:065701. [PMID: 30524011 DOI: 10.1088/1361-648x/aaf4df] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Transient absorption and photoluminescence are experimentally investigated in the polaronic reference system lithium niobate, LiNbO[Formula: see text] (LN), with the aim to refine the microscopic model of small polaron dynamics in materials with strong electron-phonon coupling. As a unique feature, our study is performed by using two different spectroscopic methods, in crystals with dopants enhancing photorefraction or damage resistance, and over a broad temperature range from 15-400 K. Although being self-consistent for particular experimental conditions, the hitherto used microscopic polaronic models reveal inconsistencies when applied to this larger data set. We show that comprehensive modeling is unlocked by the inclusion of an additional type of polaronic state with the following characteristics: (i) strongly temperature- and dopant-dependent relaxation times, (ii) an absorption feature in the blue-green spectral range, and (iii) a Kohlrausch-Williams-Watts decay shape with a temperature-dependent stretching factor [Formula: see text] showing a behavior contrary to that of small, strong-coupling polarons. The hypothesis of self-trapped excitons (STEs, i.e. bound electron-hole pairs strongly coupled to Nb[Formula: see text] and O[Formula: see text] within a niobium-oxygen octahedron) and their pinning on defects as the microscopic origin of these characteristics is supported by a spectroscopic linkage of photoluminescence at low (15 K) and elevated (300 K) temperatures and explains the long-lifetime components in transient absorption as due to pinned STEs.
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Affiliation(s)
- S Messerschmidt
- School of Physics, Osnabrueck University, Barbarastraße 7, 49076 Osnabrueck, Germany
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27
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Small Polaron Hopping in Fe:LiNbO3 as a Function of Temperature and Composition. CRYSTALS 2018. [DOI: 10.3390/cryst8070294] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Small-polaron hopping involved in charge transport in Fe-doped congruent lithium niobate is investigated as a function of temperature and composition by means of light-induced transient absorption spectroscopy. The relaxation dynamics of the light-induced polaron population is characterized by individual activation energies within different temperature ranges. A numerical investigation carried out by Monte Carlo simulations reveals that these findings may be understood in terms of the varying abundance of the different types of hops that the polarons may perform among regular or defective lattice sites. The role of the temperature and of the sample composition on the distribution of the different hop types is thus explored for a wide range of parameters, allowing one to preview the charge transport properties for a given set of experimental conditions.
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28
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Wang Y, Guo H, Zheng Q, Saidi WA, Zhao J. Tuning Solvated Electrons by Polar-Nonpolar Oxide Heterostructure. J Phys Chem Lett 2018; 9:3049-3056. [PMID: 29767527 DOI: 10.1021/acs.jpclett.8b00938] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Solvated electron states at the oxide/aqueous interface represent the lowest energy charge-transfer pathways, thereby playing an important role in photocatalysis and electronic device applications. However, their energies are usually higher than the conduction band minimum (CBM), which makes the solvated electrons difficult to utilize in charge-transfer processes. Thus it is essential to stabilize the energy of the solvated electron states. Taking LaAlO3/SrTiO3 (LAO/STO) oxide heterostructure with H2O-adsorbed monolayer as a prototypical system, we show using DFT and ab initio time-dependent nonadiabatic molecular dynamics simulation that the energy and dynamics of solvated electrons can be tuned by the electric field in the polar-nonpolar oxide heterostructure. In particular, for LAO/STO with p-type interface, the CBM is contributed by the solvated electron state when LAO is thicker than four unit cells. Furthermore, the solvated electron band minimum can be partially occupied when LAO is thicker than eight unit cells. We propose that the tunability of solvated electron states can be achieved on polar-nonpolar oxide heterostructure surfaces as well as on ferroelectric oxides, which is important for charge and proton transfer at oxide/aqueous interfaces.
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Affiliation(s)
- Yanan Wang
- ICQD/Hefei National Laboratory for Physical Sciences at Microscale and Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences and Department of Physics , University of Science and Technology of China , Hefei , Anhui 230026 , China
| | - Hongli Guo
- ICQD/Hefei National Laboratory for Physical Sciences at Microscale and Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences and Department of Physics , University of Science and Technology of China , Hefei , Anhui 230026 , China
- School of Physics and Technology, Center for Nanoscience and Nanotechnology, and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education , Wuhan University , Wuhan 430072 , China
| | - Qijing Zheng
- ICQD/Hefei National Laboratory for Physical Sciences at Microscale and Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences and Department of Physics , University of Science and Technology of China , Hefei , Anhui 230026 , China
| | - Wissam A Saidi
- Department of Mechanical Engineering and Materials Science , University of Pittsburgh , Pittsburgh , Pennsylvania 15261 , United States
| | - Jin Zhao
- ICQD/Hefei National Laboratory for Physical Sciences at Microscale and Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences and Department of Physics , University of Science and Technology of China , Hefei , Anhui 230026 , China
- Department of Physics and Astronomy , University of Pittsburgh , Pittsburgh , Pennsylvania 15260 , United States
- Synergetic Innovation Center of Quantum Information & Quantum Physics , University of Science and Technology of China , Hefei , Anhui 230026 , China
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29
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Xiong J, Du X, Cheng G, Yang H, Chen J, Dou S, Li Z. One dimensional hierarchical nanostructures composed of CdS nanosheets/nanoparticles and Ag nanowires with promoted photocatalytic performance. Inorg Chem Front 2018. [DOI: 10.1039/c8qi00014j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One dimensional Ag@CdS core–shell hierarchical nanostructures with excellent photocatalytic performance have been fabricated via a simple wet-chemistry approach at low temperature.
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Affiliation(s)
- Jinyan Xiong
- College of Chemistry and Chemical Engineering
- Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing
- Wuhan Textile University
- Wuhan 430200
- China
| | - Xulei Du
- Key Laboratory for Ultrafine Materials of Ministry of Education
- School of Materials Science and Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Gang Cheng
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan
- PR China
| | - Huagui Yang
- Key Laboratory for Ultrafine Materials of Ministry of Education
- School of Materials Science and Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Jun Chen
- Intelligent Polymer Research Institute
- The University of Wollongong
- Australia
| | - Shixue Dou
- Institute for Superconducting & Electronic Materials
- The University of Wollongong
- Australia
| | - Zhen Li
- State Key Laboratory of Radiation Medicine and Protection
- School of Radiation Medicine and Radiation Protection
- Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions
- Soochow University
- Suzhou 215123
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30
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Hao H, Zhang L, Wang W, Zeng S. Modification of heterogeneous photocatalysts for selective organic synthesis. Catal Sci Technol 2018. [DOI: 10.1039/c7cy01853c] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
This review elaborates on recent strategies of modifying heterogeneous photocatalysts for high-efficiency selective organic synthesis.
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Affiliation(s)
- Hongchang Hao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai 200050
- P.R. China
| | - Ling Zhang
- University of Chinese Academy of Sciences
- Beijing 100049
- P.R. China
| | - Wenzhong Wang
- University of Chinese Academy of Sciences
- Beijing 100049
- P.R. China
| | - Shuwen Zeng
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai 200050
- P.R. China
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31
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Hao QQ, Wang ZQ, Dai DX, Zhou CY, Yang XM. Photoelectron Spectroscopic Study of Methanol Adsorbed Rutile TiO2(110) Surface. CHINESE J CHEM PHYS 2017. [DOI: 10.1063/1674-0068/30/cjcp1711219] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Qun-qing Hao
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
| | - Zhi-qiang Wang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
- School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071 China
| | - Dong-xu Dai
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
| | - Chuan-yao Zhou
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
| | - Xue-ming Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
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32
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Shi Y, Sun H, Nguyen MC, Wang C, Ho K, Saidi WA, Zhao J. Structures of defects on anatase TiO 2(001) surfaces. NANOSCALE 2017; 9:11553-11565. [PMID: 28770922 DOI: 10.1039/c7nr02458d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Defects on oxide surfaces play a crucial role in surface reactivity and thus it is crucial to understand their atomic and electronic structures. The defects on anatase TiO2(001)-(1 × 4) surfaces are found to be highly reactive; however, due to the surface reconstruction, the defects exhibit a complicated character in different experiments that make it very challenging to determine their atomic structures. Here we present a systematic first-principles investigation of the defects on anatase TiO2(001)-(1 × 4) surfaces based on a global-search adaptive genetic algorithm (AGA) and density functional theory (DFT). For different Ti-O ratios, we identify the low energy defect structures, investigate their electronic structure using a hybrid functional, and map their regions of stability under realistic conditions. We successfully find novel oxygen vacancy (OV) and Ti interstitial (Tiini) structures that are different from the conventional ones in terms of their charge localization, magnetic state, and their scanning-tunneling-microscopy bright-dark image signature. This provides an insight into the complex geometric and electronic structure of the surface defects, and resolves several experimental discrepancies.
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Affiliation(s)
- Yongliang Shi
- ICQD/Hefei National Laboratory for Physical Sciences at Microscale, and Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences, and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
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33
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Migani A, Blancafort L. What Controls Photocatalytic Water Oxidation on Rutile TiO2(110) under Ultra-High-Vacuum Conditions? J Am Chem Soc 2017; 139:11845-11856. [DOI: 10.1021/jacs.7b05121] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Annapaola Migani
- Departament
de Química Biològica i Modelització Molecular, IQAC-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
| | - Lluís Blancafort
- Institut
de Química Computacional i Catàlisi and Departament
de Química, Universitat de Girona (UDG), C/M. A. Capmany
69, 17003 Girona, Spain
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34
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Affiliation(s)
- Norbert Hoffmann
- CNRS Université de Reims Champagne-Ardenne; ICMR; Université de Reims Champagne-Ardenne; B.P. 1039 51687 Reims France
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35
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Wu WJ, Li QS, Li ZS. Insights into the Thermal Eliminations and Photoeliminations of B,N-Heterocycles: A Theoretical Study. J Phys Chem A 2017; 121:753-761. [PMID: 28045528 DOI: 10.1021/acs.jpca.6b09495] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Understanding the photochemistry of organoboron compounds is essential to expand optoelectronic applications. In this work, the complete active space self-consistent field (CASSCF) and its second-order perturbation (CASPT2) methods combining with density functional theory (DFT) have been employed to investigate the elimination mechanisms of compound 6,7-dihydro-54-benzo[d]pyrido[2,1-f][1,2]azaborininr (B4) on the ground state (S0) and the first excited state (S1). B4 is one of the 1,2-B,N-heterocycles that undergo competitive thermal elimination and photoelimination depending on the substitution groups on the B atom and the chelate backbone, thus providing a high-selectivity synthesis strategy for luminescent compounds. Since the energy barrier from B4 to BH3-pyrido[1,2-a]isoindole (D1) and pyrido[1,2-a]isoindole (A1) on the ground state is lower than that from B4 to 54-benzo[d]pyrido[2,1-f][1,2]azaborininr (C4), the retraction ring reaction is expected to proceed with larger probability than the H2 elimination upon heating. On the contrary, photoelimination of H2 may take place easily due to the almost barrierless pathway on the S1 state. Remarkably, we have located an energetically available conical intersection (S1/S0)X-1, which allows for ultrafast S1 → S0 decay and subsequently generation of C4. Our results not only throw light on the experimental observations of the selectivity of thermal elimination and photoelimination but also provide detailed information on the excited state as instructional implications for further synthesis and application of B,N-embedded aromatics.
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Affiliation(s)
- Wen-Jie Wu
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, China
| | - Quan-Song Li
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, China
| | - Ze-Sheng Li
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, China
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36
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Cheng G, Wei Y, Xiong J, Gan Y, Zhu J, Xu F. Same titanium glycolate precursor but different products: successful synthesis of twinned anatase TiO2 nanocrystals with excellent solar photocatalytic hydrogen evolution capability. Inorg Chem Front 2017. [DOI: 10.1039/c7qi00278e] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Exploiting a synthesis protocol to tailor TiO2 with a unique morphology and crystal phase has received considerable interest in the energy and environmental fields.
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Affiliation(s)
- Gang Cheng
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan
- PR China
| | - Yi Wei
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan
- PR China
| | - Jinyan Xiong
- College of Chemistry and Chemical Engineering
- Wuhan Textile University
- Wuhan 430200
- PR China
- Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing
| | - Yixin Gan
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan
- PR China
| | - Jiaxin Zhu
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan
- PR China
| | - Feifan Xu
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan
- PR China
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37
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Xiong J, Gan Y, Zhu J, Li W, Gao C, Wei Y, Cheng G, Li Z, Dou S. Insights into the structure-induced catalysis dependence of simply engineered one-dimensional zinc oxide nanocrystals towards photocatalytic water purification. Inorg Chem Front 2017. [DOI: 10.1039/c7qi00481h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
One-dimensional nanocrystalline semiconductors have been comprehensively studied because of their fascinating properties and practical applications in various fields.
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Affiliation(s)
- Jinyan Xiong
- College of Chemistry and Chemical Engineering
- Wuhan Textile University
- Wuhan 430073
- China
- Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing
| | - Yixin Gan
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430073
- PR China
| | - Jiaxin Zhu
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430073
- PR China
| | - Wei Li
- College of Chemistry and Chemical Engineering
- Wuhan Textile University
- Wuhan 430073
- China
- Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing
| | - Chao Gao
- College of Chemistry and Chemical Engineering
- Wuhan Textile University
- Wuhan 430073
- China
| | - Yi Wei
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430073
- PR China
| | - Gang Cheng
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430073
- PR China
| | - Zhen Li
- School of Radiation Medicine and Radiation Protection
- Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions
- Soochow University
- Suzhou 215123
- China
| | - Shixue Dou
- Institute for Superconducting & Electronic Materials
- The University of Wollongong
- Australia
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