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Wanniarachchi WACP, Arunasalam T, Ravirajan P, Velauthapillai D, Vajeeston P. Hybrid Functional Study on Electronic and Optical Properties of the Dopants in Anatase TiO 2. ACS OMEGA 2023; 8:42275-42289. [PMID: 38024755 PMCID: PMC10653069 DOI: 10.1021/acsomega.3c04329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Accepted: 09/07/2023] [Indexed: 12/01/2023]
Abstract
TiO2 was known as a golden heterogeneous photocatalyst due to its chemical stability, low cost, nontoxicity, and strong oxidizing power. However, anatase TiO2 predominantly absorbs the photon energy in the ultraviolet region (λ < 387.5 nm); therefore, to increase the utilization of sunlight, the approach of doping of metals and nonmetals into pure TiO2 is implemented. Here we incorporate the dopants of Zr, Si, V, W, Ge, Cr, Sn, Mo, and Pb into the TiO2 lattice and study the optoelectronic properties, including the formation energies and the electron charge distributions, using the Vienna ab initio Simulation Package (VASP) from the hybrid functional of Heyd, Scuseria, and Erhzerhof (HSE06). We observed that V-, Mo-, and Cr-doped systems introduce shallow impurity states within the band gap, and those states influence the shift of the absorbance spectra to visible light by enhancing the photocatalytic efficiency. W-doped anatase TiO2 structure reduces the band gap of the pure anatase TiO2 by 0.7 eV. Notably, this reduction occurs without the introduction of any impurity states between the band edges. Additionally, the absorption edge of the solar spectrum shifts toward lower photon energy from 3.5 to 3.1 eV. From Bader charge analysis, we observed that mainly the charge transfer occurred from the dopants and charge accumulation happened around nearby oxygen atoms. The ferromagnetism was observed in V-, Cr-, Mo-, and W-doped anatase TiO2 structures due to the charge imbalance of the spin-up and spin-down states.
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Affiliation(s)
- W. A. Chapa Pamodani Wanniarachchi
- Clean
Energy Research Laboratory (CERL), Department of Physics, University of Jaffna, Jaffna 40000, Sri Lanka
- Faculty
of Engineering, Western Norway University
of Applied Sciences, Bergen 5020, Norway
| | - Thevakaran Arunasalam
- Clean
Energy Research Laboratory (CERL), Department of Physics, University of Jaffna, Jaffna 40000, Sri Lanka
| | - Punniamoorthy Ravirajan
- Clean
Energy Research Laboratory (CERL), Department of Physics, University of Jaffna, Jaffna 40000, Sri Lanka
| | | | - Ponniah Vajeeston
- Department
of Chemistry, Center for Materials Science and Nanotechnology, University of Oslo, Box 1033, Blindern N-0315, Oslo, Norway
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2
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He L, Zahn DRT, Madeira TI. Photocatalytic Performance of Sol-Gel Prepared TiO 2 Thin Films Annealed at Various Temperatures. MATERIALS (BASEL, SWITZERLAND) 2023; 16:5494. [PMID: 37570199 PMCID: PMC10419699 DOI: 10.3390/ma16155494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/24/2023] [Accepted: 07/31/2023] [Indexed: 08/13/2023]
Abstract
Titanium dioxide (TiO2) in the form of thin films has attracted enormous attention for photocatalysis. It combines the fundamental properties of TiO2 as a large bandgap semiconductor with the advantage of thin films, making it competitive with TiO2 powders for recycling and maintenance in photocatalytic applications. There are many aspects affecting the photocatalytic performance of thin film structures, such as the nanocrystalline size, surface morphology, and phase composition. However, the quantification of each influencing aspect needs to be better studied and correlated. Here, we prepared a series of TiO2 thin films using a sol-gel process and spin-coated on p-type, (100)-oriented silicon substrates with a native oxide layer. The as-deposited TiO2 thin films were then annealed at different temperatures from 400 °C to 800 °C for 3 h in an ambient atmosphere. This sample synthesis provided systemic parameter variation regarding the aspects mentioned above. To characterize thin films, several techniques were used. Spectroscopic ellipsometry (SE) was employed for the investigation of the film thickness and the optical properties. The results revealed that an increasing annealing temperature reduced the film thickness with an increase in the refractive index. Atomic force microscopy (AFM) was utilized to examine the surface morphology, revealing an increased surface roughness and grain sizes. X-ray diffractometry (XRD) and UV-Raman spectroscopy were used to study the phase composition and crystallite size. The annealing process initially led to the formation of pure anatase, followed by a transformation from anatase to rutile as the annealing temperature increased. An overall enhancement in crystallinity was also observed. The photocatalytic properties of the thin films were tested using the photocatalytic decomposition of acetone gas in a home-built solid (photocatalyst)-gas (reactant) reactor. The composition of the gas mixture in the reaction chamber was monitored using in situ Fourier transform infrared spectroscopy. Finally, all of the structural and spectroscopic characteristics of the TiO2 thin films were quantified and correlated with their photocatalytic properties using a correlation matrix. This provided a good overview of which film properties affect the photocatalytic efficiency the most.
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Affiliation(s)
- Lu He
- Semiconductor Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany; (D.R.T.Z.); (T.I.M.)
- Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09107 Chemnitz, Germany
| | - Dietrich R. T. Zahn
- Semiconductor Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany; (D.R.T.Z.); (T.I.M.)
- Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09107 Chemnitz, Germany
| | - Teresa I. Madeira
- Semiconductor Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany; (D.R.T.Z.); (T.I.M.)
- Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09107 Chemnitz, Germany
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3
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Liu F, Guan Y, Du X, Liu G, Sun D, Li J. A conductive and ordered macroporous structure design of titanium oxide-based catalytic cathode for lithium-sulfur batteries. NANOTECHNOLOGY 2021; 33:125704. [PMID: 34852338 DOI: 10.1088/1361-6528/ac3f15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 12/01/2021] [Indexed: 06/13/2023]
Abstract
The application of lithium-sulfur (Li-S) batteries is hindered by the insulating characteristic of sulfur and slow reaction kinetics of lithium polysulfides. Here, we propose a three-dimensionally ordered macroporous (3DOM) structured conductive polar Ta-doped TiO2framework with supported Co active site (CoTa@TiO2) to enhance the conversion kinetics of polysulfides. The 3DOM structure serves as an efficient sulfur host for the active sulfur through abundant pores and adsorption site. At the same time, the macropores can buffer the volume expansion of sulfur and enlarged mass transfer. The strong electrostatic attraction between Ti-O bond and polysulfide also promotes the adsorption of polysulfides. Moreover, the doped-Ta improves the conductivity of TiO2by narrowing the band gap, whereas the supported Co can accelerate the catalytic transformation. Benefited from advanced structural design and synergistic effect of Co and Ta doped TiO2,the Li-S cell with 3DOM CoTa@TiO2cathode exhibits an impressive areal capacity of 3.4 mAh cm-2under a high sulfur loading of 5.1 mg cm-2. This work provides an alternative strategy for the development of carbon-based cathode materials for Li-S batteries.
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Affiliation(s)
- Fan Liu
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, People's Republic of China
| | - Yani Guan
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, People's Republic of China
| | - Xiaohang Du
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, People's Republic of China
| | - Guihua Liu
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, People's Republic of China
| | - Daolai Sun
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, People's Republic of China
| | - Jingde Li
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, People's Republic of China
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4
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Manipulating the electronic and photocatalytic properties of anatase TiO2 by metalloid doping. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138907] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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5
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Zhang C, Li Z, Wang W. Critical Thermodynamic Conditions for the Formation of p-Type β-Ga 2O 3 with Cu Doping. MATERIALS (BASEL, SWITZERLAND) 2021; 14:5161. [PMID: 34576382 PMCID: PMC8469132 DOI: 10.3390/ma14185161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 09/02/2021] [Accepted: 09/06/2021] [Indexed: 11/16/2022]
Abstract
As a promising third-generation semiconductor, β-Ga2O3 is facing bottleneck for its p-type doping. We investigated the electronic structures and the stability of various Cu doped structures of β-Ga2O3. We found that Cu atoms substituting Ga atoms result in p-type conductivity. We derived the temperature and absolute oxygen partial pressure dependent formation energies of various doped structures based on first principles calculation with dipole correction. Then, the critical thermodynamic condition for forming the abovementioned substitutional structure was obtained.
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Affiliation(s)
| | | | - Weiliang Wang
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Physics, Sun Yat-sen University, Guangzhou 510275, China; (C.Z.); (Z.L.)
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Kulkarni SS, Bodkhe GA, Sayyad PW, Deshmukh MA, Hussaini SS, Shirsat MD. Optimization of Aluminium Doping Concentration in Titanium Dioxide Nanoparticles Photo Anode for Enhancing Efficiency of Dye-Sensitized Solar Cell. INTERNATIONAL JOURNAL OF NANOSCIENCE 2020. [DOI: 10.1142/s0219581x2050009x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Well crystallized Aluminium (Al) doped Titanium dioxide (TiO2) nanoparticles with various doping concentration (0, 0.05[Formula: see text]M, 0.07[Formula: see text]M, 0.09[Formula: see text]M and 0.11[Formula: see text]M) were synthesized successfully by sol–gel route to develop the photo anode of Dye Sensitized Solar Cell (DSSC). Anatase crystalline nature of TiO2 nanoparticles was confirmed using X-ray diffraction (XRD) and Raman spectrophotometer. The Atomic Force Microscopy (AFM) was used to investigate the morphology of the photo anode (Al-doped TiO2 nanoparticles). The photovoltaic performance of the DSSC in terms of Current, Voltage and efficiency was investigated with a standard illumination of AM1.5G having an irradiance 100[Formula: see text]mW/cm2. Optimized values of Short Circuit Current density ([Formula: see text]), Open Circuit Voltage ([Formula: see text]) and efficiency ([Formula: see text]) obtained was 247.62[Formula: see text][Formula: see text]A/cm2, 359[Formula: see text]mV and 0.02456%, respectively for 0.07[Formula: see text]M Al doping concentration. Eco-friendly Eosin Y dye was used for sensitization of the photo anode. The optimized photovoltaic cell exhibits very good efficiency (80.05% more than the earlier reported work).
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Affiliation(s)
- Swati S. Kulkarni
- RUSA Centre for Advanced Sensor Technology, Department of Physics, Dr. Babasaheb, Ambedkar Marathwada University, Aurangabad 431004, Maharashtra, India
- Department of Physics, Swa. Sawarkar Mahavidyalaya, Beed 431122, Maharashtra, India
| | - Gajanan A. Bodkhe
- RUSA Centre for Advanced Sensor Technology, Department of Physics, Dr. Babasaheb, Ambedkar Marathwada University, Aurangabad 431004, Maharashtra, India
| | - Pasha W. Sayyad
- RUSA Centre for Advanced Sensor Technology, Department of Physics, Dr. Babasaheb, Ambedkar Marathwada University, Aurangabad 431004, Maharashtra, India
| | - Megha A. Deshmukh
- School of Physical Sciences, Solapur University, Solapur 413255, Maharashtra, India
| | - S. S. Hussaini
- Crystal Growth Laboratory, Department of Physics, Milliya Arts, Science and Management Science College, Beed 431122, Maharashtra India
| | - Mahendra D. Shirsat
- RUSA Centre for Advanced Sensor Technology, Department of Physics, Dr. Babasaheb, Ambedkar Marathwada University, Aurangabad 431004, Maharashtra, India
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7
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Su Z, Liu J, Li M, Zhu Y, Qian S, Weng M, Zheng J, Zhong Y, Pan F, Zhang S. Defect Engineering in Titanium-Based Oxides for Electrochemical Energy Storage Devices. ELECTROCHEM ENERGY R 2020. [DOI: 10.1007/s41918-020-00064-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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8
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Titania supported synergistic palladium single atoms and nanoparticles for room temperature ketone and aldehydes hydrogenation. Nat Commun 2020; 11:48. [PMID: 31911600 PMCID: PMC6946645 DOI: 10.1038/s41467-019-13941-5] [Citation(s) in RCA: 111] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Accepted: 12/09/2019] [Indexed: 12/13/2022] Open
Abstract
Selective reduction of ketone/aldehydes to alcohols is of great importance in green chemistry and chemical engineering. Highly efficient catalysts are still demanded to work under mild conditions, especially at room temperature. Here we present a synergistic function of single-atom palladium (Pd1) and nanoparticles (PdNPs) on TiO2 for highly efficient ketone/aldehydes hydrogenation to alcohols at room temperature. Compared to simple but inferior Pd1/TiO2 and PdNPs/TiO2 catalysts, more than twice activity enhancement is achieved with the Pd1+NPs/TiO2 catalyst that integrates both Pd1 and Pd NPs on mesoporous TiO2 supports, obtained by a simple but large-scaled spray pyrolysis route. The synergistic function of Pd1 and PdNPs is assigned so that the partial Pd1 dispersion contributes enough sites for the activation of C=O group while PdNPs site boosts the dissociation of H2 molecules to H atoms. This work not only contributes a superior catalyst for ketone/aldehydes hydrogenation, but also deepens the knowledge on their hydrogenation mechanism and guides people to engineer the catalytic behaviors as needed.
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9
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Liu J, Weng M, Li S, Chen X, Cen J, Jie J, Xiao W, Zheng J, Pan F. High-throughput HSE study on the doping effect in anatase TiO2. Phys Chem Chem Phys 2020; 22:39-53. [DOI: 10.1039/c9cp04591k] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Systematic study on the doping effects of anatase TiO2 doped with 40 kinds of elements by high-throughput HSE06 calculations.
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Affiliation(s)
- Jiahua Liu
- School of Advanced Materials
- Peking University
- Shenzhen Graduate School
- Shenzhen 518055
- China
| | - Mouyi Weng
- School of Advanced Materials
- Peking University
- Shenzhen Graduate School
- Shenzhen 518055
- China
| | - Sibai Li
- School of Advanced Materials
- Peking University
- Shenzhen Graduate School
- Shenzhen 518055
- China
| | - Xin Chen
- School of Advanced Materials
- Peking University
- Shenzhen Graduate School
- Shenzhen 518055
- China
| | - Jianhang Cen
- School of Advanced Materials
- Peking University
- Shenzhen Graduate School
- Shenzhen 518055
- China
| | - Jianshu Jie
- School of Advanced Materials
- Peking University
- Shenzhen Graduate School
- Shenzhen 518055
- China
| | - Weiji Xiao
- School of Advanced Materials
- Peking University
- Shenzhen Graduate School
- Shenzhen 518055
- China
| | - Jiaxin Zheng
- School of Advanced Materials
- Peking University
- Shenzhen Graduate School
- Shenzhen 518055
- China
| | - Feng Pan
- School of Advanced Materials
- Peking University
- Shenzhen Graduate School
- Shenzhen 518055
- China
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10
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Wang X, Wang LL, Guo D, Ma LL, Zhu BL, Wang P, Wang GC, Zhang SM, Huang WP. Fabrication and photocatalytic performance of C, N, F-tridoped TiO2 nanotubes. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.05.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Yan W, Liu X. Niobium-Doped TiO 2: Effect of an Interstitial Oxygen Atom on the Charge State of Niobium. Inorg Chem 2019; 58:3090-3098. [PMID: 30788959 DOI: 10.1021/acs.inorgchem.8b03096] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The structural and electronic properties of Nb-doped rutile TiO2 with several doping configurations were investigated by first-principles calculations based on the density functional theory. The calculations show that although the band gap in the NbTi, 2NbTi, and NbTi + Oi systems is small, the intragap states would be the electron-hole recombination center, leading to low photocatalytic efficiency. However, for the 2NbTi + Oi configuration, the impurity states are mainly located at the top of the valence band and the electron-hole recombination would be inhibited, indicating relatively higher photocatalytic efficiency. On the basis of the charge-compensated theory, two electrons on the transition-metal Nb atoms compensate for the same amount of holes on the acceptor level of a nonmetal interstitial O atom, in the model of 2NbTi + Oi. Such donor-acceptor codoping may not only suppress the electron-hole recombination but also maintain a reduced band gap, suggesting that the doping models would exhibit higher photocatalytic activity than pure TiO2. The calculation results show that the interstitial O atoms play an essential role in manipulating the valence state of impurity Nb. The role of the interstitial O atom in Nb-doped rutile TiO2 suggests that it can give rise to beneficial charge-compensation effects.
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Affiliation(s)
- Wei Yan
- Center for Quantum Sciences and School of Physics , Northeast Normal University , Changchun 130117 , China
| | - Xiaojie Liu
- Center for Quantum Sciences and School of Physics , Northeast Normal University , Changchun 130117 , China.,Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Educations , Northeast Normal University , Changchun 130024 , China
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12
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Bendova M, Kolar J, Gispert-Guirado F, Mozalev A. Porous-Alumina-Assisted Growth of Nanostructured Anodic Films on Ti−Nb Alloys. ChemElectroChem 2018. [DOI: 10.1002/celc.201800785] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Maria Bendova
- CEITEC - Central European Institute of Technology; Brno University of Technology; Purkynova 123 61200 Brno Czech Republic
| | - Jakub Kolar
- CEITEC - Central European Institute of Technology; Brno University of Technology; Purkynova 123 61200 Brno Czech Republic
| | - Francesc Gispert-Guirado
- SRCiT - Scientific Resources Service; University Rovira i Virgili; Av. Paisos Catalans 26 43007 Tarragona, Catalonia Spain
| | - Alexander Mozalev
- CEITEC - Central European Institute of Technology; Brno University of Technology; Purkynova 123 61200 Brno Czech Republic
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13
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Zhao Y, Wang W, He L. The effects of Co/N dopants on the electronic, redox potential, optical, and photocatalytic water-splitting properties of TiO2: First principles calculations. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.07.046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Belver C, Han C, Rodriguez J, Dionysiou D. Innovative W-doped titanium dioxide anchored on clay for photocatalytic removal of atrazine. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.04.029] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Belver C, Bedia J, Rodriguez JJ. Zr-doped TiO 2 supported on delaminated clay materials for solar photocatalytic treatment of emerging pollutants. JOURNAL OF HAZARDOUS MATERIALS 2017; 322:233-242. [PMID: 26948509 DOI: 10.1016/j.jhazmat.2016.02.028] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 02/02/2016] [Accepted: 02/11/2016] [Indexed: 06/05/2023]
Abstract
Solar light-active Zr-doped TiO2 nanoparticles were successfully immobilized on delaminated clay materials by a one-step sol-gel route. Fixing the amount of TiO2 at 65wt.%, this work studies the influence of Zr loading (up to 2%) on the photocatalytic activity of the resulting Zr-doped TiO2/clay materials. The structural characterization demonstrates that all samples were formed by a delaminated clay with nanostructured anatase assembled on its surface. The Zr dopant was successfully incorporated into the anatase lattice, resulting in a slight deformation of the anatase crystal and the reduction of the band gap. These materials exhibit high surface area with a disordered mesoporous structure formed by TiO2 particles (15-20nm) supported on a delaminated clay. They were tested in the solar photodegradation of antipyrine, usually used as an analgesic drug and selected as an example of emerging pollutant. High degradation rates have been obtained at low antipyrine concentrations and high solar irradiation intensities with the Zr-doped TiO2/clay catalyst, more effective than the undoped one. This work demonstrates the potential application of the synthesis method for preparing novel and efficient solar-light photocatalysts based on metal-doped anatase and a delaminated clay.
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Affiliation(s)
- C Belver
- Seccion de Ingenieria Quimica, Facultad de Ciencias, Universidad Autonoma de Madrid, Campus Cantoblanco, E-28049 Madrid, Spain.
| | - J Bedia
- Seccion de Ingenieria Quimica, Facultad de Ciencias, Universidad Autonoma de Madrid, Campus Cantoblanco, E-28049 Madrid, Spain
| | - J J Rodriguez
- Seccion de Ingenieria Quimica, Facultad de Ciencias, Universidad Autonoma de Madrid, Campus Cantoblanco, E-28049 Madrid, Spain
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16
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Zhao Y, Wang W, Li C, He L. Electronic and photocatalytic properties of N/F co-doped anatase TiO2. RSC Adv 2017. [DOI: 10.1039/c7ra10546k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The band structures of undoped, Ns doped, Ns–Fs co-doped, Ns–Fi co-doped, Ni–Fs co-doped and Ni–Fi co-doped TiO2.
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Affiliation(s)
- Yafei Zhao
- National Laboratory of Solid State Microstructures
- School of Electronic Science and Engineering
- Collaborative Innovation Center of Advanced Microstructures
- Nanjing University
- Nanjing 210093
| | - Wei Wang
- National Laboratory of Solid State Microstructures
- School of Electronic Science and Engineering
- Collaborative Innovation Center of Advanced Microstructures
- Nanjing University
- Nanjing 210093
| | - Can Li
- Center for Coordination Bond Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou 310018
- China
| | - Liang He
- National Laboratory of Solid State Microstructures
- School of Electronic Science and Engineering
- Collaborative Innovation Center of Advanced Microstructures
- Nanjing University
- Nanjing 210093
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17
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18
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Li L, Meng F, Hu X, Qiao L, Sun CQ, Tian H, Zheng W. TiO2 Band Restructuring by B and P Dopants. PLoS One 2016; 11:e0152726. [PMID: 27054763 PMCID: PMC4824356 DOI: 10.1371/journal.pone.0152726] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 03/19/2016] [Indexed: 11/18/2022] Open
Abstract
An examination of the effect of B- and P-doping and codoping on the electronic structure of anatase TiO2 by performing density functional theory calculations revealed the following: (i) B- or P-doping effects are similar to atomic undercoordination effects on local bond relaxation and core electron entrapment; (ii) the locally entrapped charge adds impurity levels within the band gap that could enhance the utilization of TiO2 to absorb visible light and prolong the carrier lifetime; (iii) the core electron entrapment polarizes nonbonding electrons in the upper edges of the valence and conduction bands, which reduces not only the work function but also the band gap; and (iv) work function reduction enhances the reactivity of the carriers and band gap reduction promotes visible-light absorption. These observations may shed light on effective catalyst design and synthesis.
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Affiliation(s)
- Lei Li
- Department of Materials Science and Key Laboratory of Automobile Materials of MOE and State Key Laboratory of Superhard Materials, Jilin University, Changchun, China
| | - Fanling Meng
- Department of Materials Science and Key Laboratory of Automobile Materials of MOE and State Key Laboratory of Superhard Materials, Jilin University, Changchun, China
| | - Xiaoying Hu
- College of Science, Changchun University, Changchun, China
| | - Liang Qiao
- College of Science, Changchun University, Changchun, China
| | - Chang Q Sun
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore
| | - Hongwei Tian
- Department of Materials Science and Key Laboratory of Automobile Materials of MOE and State Key Laboratory of Superhard Materials, Jilin University, Changchun, China
- * E-mail: (WTZ); (HWT)
| | - Weitao Zheng
- Department of Materials Science and Key Laboratory of Automobile Materials of MOE and State Key Laboratory of Superhard Materials, Jilin University, Changchun, China
- * E-mail: (WTZ); (HWT)
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Zhao YF, Li C, Lu S, Yan LJ, Gong YY, Niu LY, Liu XJ. Effects of oxygen vacancy on 3d transition-metal doped anatase TiO2: First principles calculations. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.01.040] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zhao YF, Li C, Lu S, Liu RX, Hu JY, Gong YY, Niu LY. Electronic, optical and photocatalytic behavior of Mn, N doped and co-doped TiO2: Experiment and simulation. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2016.01.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Lu S, Li C, Zhao YF, Li HH, Gong YY, Niu LY, Liu XJ, Wang T. The effects of nonmetal dopants on the electronic, optical, and catalytic performances of monolayer WSe2 by a first-principles study. RSC Adv 2016. [DOI: 10.1039/c6ra15697e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Doping modifies the electronic, optical, and catalytic behavior of materials through the newly formed chemical bonds and the localized electrons.
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Affiliation(s)
- S. Lu
- Institute of Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou 310018
- China
| | - C. Li
- Institute of Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou 310018
- China
| | - Y. F. Zhao
- Institute of Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou 310018
- China
| | - H. H. Li
- Institute of Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou 310018
- China
| | - Y. Y. Gong
- Institute of Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou 310018
- China
| | - L. Y. Niu
- Institute of Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou 310018
- China
| | - X. J. Liu
- Institute of Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou 310018
- China
| | - T. Wang
- College of Electrical Engineering
- Zhejiang University
- Hangzhou 310027
- China
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22
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Srathongluan P, Kuhamaneechot R, Sukthao P, Vailikhit V, Choopun S, Tubtimtae A. Photovoltaic performances of Cu2-xTe sensitizer based on undoped and indium(3+)-doped TiO2 photoelectrodes and assembled counter electrodes. J Colloid Interface Sci 2015; 463:222-8. [PMID: 26524258 DOI: 10.1016/j.jcis.2015.10.052] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Accepted: 10/20/2015] [Indexed: 11/17/2022]
Abstract
Novel binary Cu2-xTe nanoparticles based on undoped and indium-doped TiO2 photoelectrodes were synthesized using a successive ionic layer adsorption and reaction (SILAR) technique as a sensitizer for liquid-junction solar cells. A larger diameter of TiO2 promoted a narrower energy band gap after indium doping, attributing to yield a broader absorption range of nanoparticle sensitizer due to the increasing amount of Cu2-xTe NPs on TiO2 surface. The atomic percentages showed the stoichiometric formation of Cu2Te incorporated in a Cu2-xTe structure. The best photovoltaic performance with the lower SILAR cycle, i.e., n=13 was performed after indium doping in both of carbon and Cu2S CEs and revealed that the efficiency of 0.73% under the radiant 100mW/cm(2) (AM 1.5G). The electrochemical impedance spectroscopy (EIS) was used to investigate the electrical properties via effect of material doping and counter electrodes with a lower charge-transfer resistance (Rct) and it was also found that the electron lifetime was improved after the sample doped with indium and assembled with carbon CE.
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Affiliation(s)
- Pornpimol Srathongluan
- Department of Chemistry, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand.
| | - Rattanakorn Kuhamaneechot
- Department of Physics, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand.
| | - Prapatsawan Sukthao
- Department of Physics, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand.
| | - Veeramol Vailikhit
- Department of Chemistry, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand.
| | - Supab Choopun
- Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; ThEP Center, CHE, Bangkok 10400, Thailand.
| | - Auttasit Tubtimtae
- Department of Physics, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand; Nano Engineering & Material Sciences Research Unit (NEMS), Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand.
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23
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Electronic and photonic behavior of (Fe or Co)-C codoped TiO2 mediated by H ions: First principles calculations. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.08.049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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24
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Pan J, Li C, Zhao Y, Liu R, Gong Y, Niu L, Liu X, Chi B. Electronic properties of TiO2 doped with Sc, Y, La, Zr, Hf, V, Nb and Ta. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.03.056] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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