1
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Jakubow-Piotrowska K, Witkowski B, Augustynski J. Photoelectrocatalytic hydrogen generation coupled with reforming of glucose into valuable chemicals using a nanostructured WO 3 photoanode. Commun Chem 2022; 5:125. [PMID: 36697912 PMCID: PMC9814346 DOI: 10.1038/s42004-022-00745-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Accepted: 09/29/2022] [Indexed: 01/28/2023] Open
Abstract
Coupling the photo-oxidation of biomass derived substrates with water splitting in a photoelectrochemical (PEC) cell is a broadly discussed approach intended to enhance efficiency of hydrogen generation at the cathode. Here, we report a PEC device employing a nanostructured semitransparent WO3 photoanode that, irradiated with simulated solar light achieves large photocurrents of 6.5 mA cm-2 through oxidation of glucose, a common carbohydrate available in nature that can be obtained by processing waste biomass. The attained photocurrents are in a large part due to the occurrence of the photocurrent doubling, where oxidation of glucose by the photogenerated positive hole is followed by injection by the formed intermediate of an electron into the conduction band of WO3. Selection of an appropriate supporting electrolyte enabled effective reforming of glucose into valuable products: gluconic and glucaric acids, erythrose and arabinose with up to 64% total Faradaic yield attained at ca 15% glucose conversion.
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Affiliation(s)
- Katarzyna Jakubow-Piotrowska
- grid.12847.380000 0004 1937 1290Centre of New Technologies, University of Warsaw, S. Banacha 2c, 02-097 Warsaw, Poland
| | - Bartłomiej Witkowski
- grid.12847.380000 0004 1937 1290Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Jan Augustynski
- grid.12847.380000 0004 1937 1290Centre of New Technologies, University of Warsaw, S. Banacha 2c, 02-097 Warsaw, Poland
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2
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Dagdeviren OE, Glass D, Sapienza R, Cortés E, Maier SA, Parkin IP, Grütter P, Quesada-Cabrera R. The Effect of Photoinduced Surface Oxygen Vacancies on the Charge Carrier Dynamics in TiO 2 Films. NANO LETTERS 2021; 21:8348-8354. [PMID: 34582208 DOI: 10.1021/acs.nanolett.1c02853] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Metal-oxide semiconductors (MOS) are widely utilized for catalytic and photocatalytic applications in which the dynamics of charged carriers (e.g., electrons, holes) play important roles. Under operation conditions, photoinduced surface oxygen vacancies (PI-SOV) can greatly impact the dynamics of charge carriers. However, current knowledge regarding the effect of PI-SOV on the dynamics of hole migration in MOS films, such as titanium dioxide, is solely based upon volume-averaged measurements and/or vacuum conditions. This limits the basic understanding of hole-vacancy interactions, as they are not capable of revealing time-resolved variations during operation. Here, we measured the effect of PI-SOV on the dynamics of hole migration using time-resolved atomic force microscopy. Our findings demonstrate that the time constant associated with hole migration is strongly affected by PI-SOV, in a reversible manner. These results will nucleate an insightful understanding of the physics of hole dynamics and thus enable emerging technologies, facilitated by engineering hole-vacancy interactions.
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Affiliation(s)
- Omur E Dagdeviren
- Department of Mechanical Engineering, École de technologie supérieure, University of Quebec, Montreal H3C 1K3, Quebec, Canada
| | - Daniel Glass
- The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, U.K
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Riccardo Sapienza
- The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, U.K
| | - Emiliano Cortés
- Chair in Hybrid Nanosystems, Faculty of Physics, Ludwig Maximilians Universität München, München 80539, Germany
| | - Stefan A Maier
- The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, U.K
- Chair in Hybrid Nanosystems, Faculty of Physics, Ludwig Maximilians Universität München, München 80539, Germany
| | - Ivan P Parkin
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Peter Grütter
- Department of Physics, McGill University, Montreal H3A 2T8, Quebec, Canada
| | - Raul Quesada-Cabrera
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
- Fotoelectrocatálisis para Aplicaciones Medioambientales, Departamento de Química, Universidad de Las Palmas de Gran Canaria, Edificio Polivalente I, Campus de Tafira, Las Palmas de Gran Canaria 35017, Spain
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3
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Le MC, Le TH, Bui Thi TH, Nguyen QD, Do Thi TH, Tran Thi MN. Synthesizing and Evaluating the Photocatalytic and Antibacterial Ability of TiO 2/SiO 2 Nanocomposite for Silicate Coating. Front Chem 2021; 9:738969. [PMID: 34604172 PMCID: PMC8485069 DOI: 10.3389/fchem.2021.738969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 09/02/2021] [Indexed: 11/23/2022] Open
Abstract
The TiO2/SiO2 nanocomposite has been synthesized by a sol-gel method and investigated the effect of the SiO2 content (0, 5, 10, 15, 20, and 50%) on the rutile-to-anatase phase transition of TiO2 NPs. In order to increase the photocatalytic efficiency of the nanocomposite and decrease the price of material, the TiO2/SiO2 Nc with content SiO2 of 15% sample is chosen for preparing silicate coating. The efficiency of photocatalytic MB and antibacterial ability in the air of W silicate coating (adding TiO2/SiO2 Nc (15%)) achieve almost 100% for 60 h and 94.35% for 3 h, respectively. While the efficiency of photocatalytic MB and antibacterial ability of WO silicate coating (adding commercial TiO2/SiO2) is about 25–30% for 60 h and 6.02% for 3 h, respectively. The presence of TiO2/SiO2 Nc (15%) with a larger surface area in W silicate coating can provide increased centers for absorption, photocatalytic reaction, and the contact between sample and bacteria lead to enhance the photocatalytic and antibacterial ability of W silicate coating.
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Affiliation(s)
- Manh-Cuong Le
- Faculty of Building Material, National University of Civil Engineering, Hanoi, Vietnam
| | - Thu-Huong Le
- Faculty of Chemistry and Environment, Thuyloi University, Hanoi, Vienam
| | - Thanh-Huyen Bui Thi
- Faculty of Building Material, National University of Civil Engineering, Hanoi, Vietnam
| | - Quang-Dat Nguyen
- Faculty of Building Material, National University of Civil Engineering, Hanoi, Vietnam
| | - Thanh-Ha Do Thi
- Faculty of Building Material, National University of Civil Engineering, Hanoi, Vietnam
| | - Minh-Nguyet Tran Thi
- Faculty of Building Material, National University of Civil Engineering, Hanoi, Vietnam
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4
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Ezhilmaran B, Dhanasekar M, Bhat SV. Solution processed transparent anatase TiO 2 nanoparticles/MoO 3 nanostructures heterojunction: high performance self-powered UV detector for low-power and low-light applications. NANOSCALE ADVANCES 2021; 3:1047-1056. [PMID: 36133282 PMCID: PMC9419760 DOI: 10.1039/d0na00780c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Accepted: 12/17/2020] [Indexed: 05/04/2023]
Abstract
Ultraviolet (UV) photodetectors are considered as the major players in energy saving technology of the future. Efforts are needed to further develop such devices, which are capable of operating efficiently at low driving potential as well as with weak illumination. Herein, we report an all-oxide, highly transparent TiO2/MoO3 bilayer film, with nanoparticulate anatase TiO2 as the platform, fabricated by a simple solution based method and demonstrate its use in UV photodetection. Photoconductivity measurement with 352 nm light reveals the self-powered UV detection capability of the device due to the built-in potential at the bilayer interface. The device exhibits a high photoresponsivity (46.05 A W-1), detectivity (2.84 × 1012 Jones) and EQE (16 223%) even with a weak illumination of 76 μW cm-2, at a low bias of only -1 V. The self-powered performance of the bilayer device is comparable to that of commercial Si photodetectors as well as other such UV detectors reported based on metal oxide heterojunctions. The improved and faster photoresponse shown by the device is due to the formation of an effective heterojunction, as evidenced by XPS, electrochemical and I-V studies. It can be further attributed to the better charge transport through the densely aligned nanostructures, reduced recombination and the better mobility of anatase TiO2 nanoparticles. The performance is best-in-class and proves the potential of the transparent heterojunction to be used in highly responsive, self-powered UV detectors for low bias, low light applications.
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Affiliation(s)
- Bhuvaneshwari Ezhilmaran
- SRM Research Institute, SRM Institute of Science and Technology Kattankulathur Kancheepuram-603203 India
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology Kattankulathur Kancheepuram-603203 India
| | - M Dhanasekar
- SRM Research Institute, SRM Institute of Science and Technology Kattankulathur Kancheepuram-603203 India
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology Kattankulathur Kancheepuram-603203 India
| | - S Venkataprasad Bhat
- SRM Research Institute, SRM Institute of Science and Technology Kattankulathur Kancheepuram-603203 India
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology Kattankulathur Kancheepuram-603203 India
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5
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Liu B, Zhao X, Yu J, Parkin IP, Fujishima A, Nakata K. Intrinsic intermediate gap states of TiO2 materials and their roles in charge carrier kinetics. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2019. [DOI: 10.1016/j.jphotochemrev.2019.02.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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6
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Mérai L, Varga N, Deák Á, Sebők D, Szenti I, Kukovecz Á, Kónya Z, Dékány I, Janovák L. Preparation of photocatalytic thin films with composition dependent wetting properties and self-healing ability. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.10.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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7
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Negreiros FR, Soldano GJ, Fuentes S, Zepeda T, José-Yacamán M, Mariscal MM. The unexpected effect of vacancies and wrinkling on the electronic properties of MoS2 layers. Phys Chem Chem Phys 2019; 21:24731-24739. [DOI: 10.1039/c9cp04347k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a combined experimental/theoretical approach to study the connection of S-vacancies and wrinkling on MoS2 layers, and how this feature produces significant changes in the electronic structure and reactivity of this 2D material.
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Affiliation(s)
- Fábio R. Negreiros
- INFIQC
- CONICET
- Departamento de Química Teórica y Computacional
- Facultad de Ciencias Químicas
- Universidad Nacional de Córdoba
| | - Germán J. Soldano
- INFIQC
- CONICET
- Departamento de Química Teórica y Computacional
- Facultad de Ciencias Químicas
- Universidad Nacional de Córdoba
| | - Sergio Fuentes
- Universidad Nacional Autonóma de México
- Centro de Nanociencia y Nanotecnología
- Ensenada
- Mexico
| | - Trino Zepeda
- Universidad Nacional Autonóma de México
- Centro de Nanociencia y Nanotecnología
- Ensenada
- Mexico
| | - Miguel José-Yacamán
- Applied Physics and Materials Science Department
- Northern Arizona University
- USA
| | - Marcelo M. Mariscal
- INFIQC
- CONICET
- Departamento de Química Teórica y Computacional
- Facultad de Ciencias Químicas
- Universidad Nacional de Córdoba
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8
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Butburee T, Bai Y, Wang H, Chen H, Wang Z, Liu G, Zou J, Khemthong P, Lu GQM, Wang L. 2D Porous TiO 2 Single-Crystalline Nanostructure Demonstrating High Photo-Electrochemical Water Splitting Performance. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1705666. [PMID: 29659100 DOI: 10.1002/adma.201705666] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 02/12/2018] [Indexed: 05/23/2023]
Abstract
Porous single crystals are promising candidates for solar fuel production owing to their long range charge diffusion length, structural coherence, and sufficient reactive sites. Here, a simple template-free method of growing a selectively branched, 2D anatase TiO2 porous single crystalline nanostructure (PSN) on fluorine-doped tin oxide substrate is demonstrated. An innovative ion exchange-induced pore-forming process is designed to successfully create high porosity in the single-crystalline nanostructure with retention of excellent charge mobility and no detriment to crystal structure. PSN TiO2 film delivers a photocurrent of 1.02 mA cm-2 at a very low potential of 0.4 V versus reversible hydrogen electrode (RHE) for photo-electrochemical water splitting, closing to the theoretical value of TiO2 (1.12 mA cm-2 ). Moreover, the current-potential curve featuring a small potential window from 0.1 to 0.4 V versus RHE under one-sun illumination has a near-ideal shape predicted by the Gartner Model, revealing that the charge separation and surface reaction on the PSN TiO2 photoanode are very efficient. The photo-electrochemical water splitting performance of the films indicates that the ion exchange-assisted synthesis strategy is effective in creating large surface area and single-crystalline porous photoelectrodes for efficient solar energy conversion.
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Affiliation(s)
- Teera Butburee
- Nanomaterials Centre, Australian Institute for Bioengineering and Nanotechnology and School of Chemical Engineering, The University of Queensland, St Lucia, QLD, 4072, Australia
- National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Klong Luang, Pathumthani, 12120, Thailand
| | - Yang Bai
- Nanomaterials Centre, Australian Institute for Bioengineering and Nanotechnology and School of Chemical Engineering, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Huanjun Wang
- Nanomaterials Centre, Australian Institute for Bioengineering and Nanotechnology and School of Chemical Engineering, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Hongjun Chen
- Nanomaterials Centre, Australian Institute for Bioengineering and Nanotechnology and School of Chemical Engineering, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Zhiliang Wang
- Nanomaterials Centre, Australian Institute for Bioengineering and Nanotechnology and School of Chemical Engineering, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Gang Liu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
- School of Materials Science and Engineering, University of Science and Technology of China, 72 Wenhua Road, Shenyang, 110016, China
| | - Jin Zou
- Materials Engineering and Centre for Microscopy and Microanalysis, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - Pongtanawat Khemthong
- National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Klong Luang, Pathumthani, 12120, Thailand
| | | | - Lianzhou Wang
- Nanomaterials Centre, Australian Institute for Bioengineering and Nanotechnology and School of Chemical Engineering, The University of Queensland, St Lucia, QLD, 4072, Australia
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9
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Growth of bismuth oxyhalide nanoplates on self-standing TiO2 nanowire film exhibiting enhanced photoelectrochemical performances. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.07.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Holze S, Krüger B, Hoffmann T, Bück A, Schwidder M. Influence of TiO2
-Layer Thickness of Spray-Coated Glass Beads on Their Photocatalytic Performance. Chem Eng Technol 2017. [DOI: 10.1002/ceat.201600432] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Susann Holze
- Otto von Guericke University; Institute of Chemistry; Universitätsplatz 2 39106 Magdeburg Germany
| | - Benjamin Krüger
- Otto von Guericke University; Institute of Chemistry; Universitätsplatz 2 39106 Magdeburg Germany
| | - Torsten Hoffmann
- Otto von Guericke University; Institute of Thermal Process Engineering; Universitätsplatz 2 39106 Magdeburg Germany
| | - Andreas Bück
- Otto von Guericke University; Institute of Thermal Process Engineering; Universitätsplatz 2 39106 Magdeburg Germany
| | - Michael Schwidder
- Otto von Guericke University; Institute of Chemistry; Universitätsplatz 2 39106 Magdeburg Germany
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11
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Sanwald KE, Berto TF, Eisenreich W, Jentys A, Gutiérrez OY, Lercher JA. Overcoming the Rate-Limiting Reaction during Photoreforming of Sugar Aldoses for H2-Generation. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00508] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kai E. Sanwald
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse
4, 85747 Garching, Germany
| | - Tobias F. Berto
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse
4, 85747 Garching, Germany
| | - Wolfgang Eisenreich
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse
4, 85747 Garching, Germany
| | - Andreas Jentys
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse
4, 85747 Garching, Germany
| | - Oliver Y. Gutiérrez
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse
4, 85747 Garching, Germany
| | - Johannes A. Lercher
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse
4, 85747 Garching, Germany
- Institute
for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
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12
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Molinari A, Maldotti A, Amadelli R. Effect of the electrolyte cations on photoinduced charge transfer at TiO 2. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.09.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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13
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Wang J, Li H, Meng S, Ye X, Fu X, Chen S. Controlled synthesis of Sn-based oxides via a hydrothermal method and their visible light photocatalytic performances. RSC Adv 2017. [DOI: 10.1039/c7ra04041e] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Controlled synthesize of Sn-oxides was achieved via a facile hydrothermal method with SnCl2 as precursor. A visible light photocatalytic activity of SnO2 can be induced by doping with Sn2+ or coupling with SnO.
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Affiliation(s)
- Jinghui Wang
- College of Chemistry and Material Science
- Huaibei Normal University
- Huaibei
- China
| | - Hui Li
- College of Chemistry and Material Science
- Huaibei Normal University
- Huaibei
- China
| | - Sugang Meng
- College of Chemistry and Material Science
- Huaibei Normal University
- Huaibei
- China
| | - Xiangju Ye
- Department of Chemistry
- Anhui Science and Technology University
- Fengyang
- China
| | - Xianliang Fu
- College of Chemistry and Material Science
- Huaibei Normal University
- Huaibei
- China
| | - Shifu Chen
- College of Chemistry and Material Science
- Huaibei Normal University
- Huaibei
- China
- Department of Chemistry
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14
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Valitova I, Kumar P, Meng X, Soavi F, Santato C, Cicoira F. Photolithographically Patterned TiO2 Films for Electrolyte-Gated Transistors. ACS APPLIED MATERIALS & INTERFACES 2016; 8:14855-14862. [PMID: 27193379 DOI: 10.1021/acsami.6b01922] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Metal oxides constitute a class of materials whose properties cover the entire range from insulators to semiconductors to metals. Most metal oxides are abundant and accessible at moderate cost. Metal oxides are widely investigated as channel materials in transistors, including electrolyte-gated transistors, where the charge carrier density can be modulated by orders of magnitude upon application of relatively low electrical bias (2 V). Electrolyte gating offers the opportunity to envisage new applications in flexible and printed electronics as well as to improve our current understanding of fundamental processes in electronic materials, e.g. insulator/metal transitions. In this work, we employ photolithographically patterned TiO2 films as channels for electrolyte-gated transistors. TiO2 stands out for its biocompatibility and wide use in sensing, electrochromics, photovoltaics and photocatalysis. We fabricated TiO2 electrolyte-gated transistors using an original unconventional parylene-based patterning technique. By using a combination of electrochemical and charge carrier transport measurements we demonstrated that patterning improves the performance of electrolyte-gated TiO2 transistors with respect to their unpatterned counterparts. Patterned electrolyte-gated (EG) TiO2 transistors show threshold voltages of about 0.9 V, ON/OFF ratios as high as 1 × 10(5), and electron mobility above 1 cm(2)/(V s).
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Affiliation(s)
| | | | | | - Francesca Soavi
- Dipartimento di Chimica "Giacomo Ciamician", Università di Bologna , Via Selmi 2, Bologna 40126, Italy
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15
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Márquez A, Rodríguez-Pérez MJ, Anta JA, Rodríguez-Gattorno G, Bourret GR, Oskam G, Berger T. Defects in Porous Networks of WO3
Particle Aggregates. ChemElectroChem 2016. [DOI: 10.1002/celc.201500435] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Augusto Márquez
- Department of Chemistry and Physics of Materials; Paris Lodron University of Salzburg; Hellbrunnerstrasse 34/III 5020 Salzburg Austria
- Departamento de Sistemas Físicos, Químicos y Naturales; Universidad Pablo de Olavide; Ctra. Utrera, km 1 41013 Sevilla Spain
| | - Manuel J. Rodríguez-Pérez
- Departamento de Física Aplicada; CINVESTAV-IPN; Ctra. Antigua a Progreso Km. 6, Mérida Yucatán 97310 Mexico
| | - Juan A. Anta
- Departamento de Sistemas Físicos, Químicos y Naturales; Universidad Pablo de Olavide; Ctra. Utrera, km 1 41013 Sevilla Spain
| | - Geonel Rodríguez-Gattorno
- Departamento de Física Aplicada; CINVESTAV-IPN; Ctra. Antigua a Progreso Km. 6, Mérida Yucatán 97310 Mexico
| | - Gilles R. Bourret
- Department of Chemistry and Physics of Materials; Paris Lodron University of Salzburg; Hellbrunnerstrasse 34/III 5020 Salzburg Austria
| | - Gerko Oskam
- Departamento de Física Aplicada; CINVESTAV-IPN; Ctra. Antigua a Progreso Km. 6, Mérida Yucatán 97310 Mexico
| | - Thomas Berger
- Department of Chemistry and Physics of Materials; Paris Lodron University of Salzburg; Hellbrunnerstrasse 34/III 5020 Salzburg Austria
- Departamento de Sistemas Físicos, Químicos y Naturales; Universidad Pablo de Olavide; Ctra. Utrera, km 1 41013 Sevilla Spain
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16
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A photo-(electro)-catalytic system illustrating the effect of lithium ions on titania surface energetics and charge transfer. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.07.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Mou F, Li Y, Chen C, Li W, Yin Y, Ma H, Guan J. Single-Component TiO2 Tubular Microengines with Motion Controlled by Light-Induced Bubbles. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:2564-70. [PMID: 25627213 DOI: 10.1002/smll.201403372] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 01/03/2015] [Indexed: 05/27/2023]
Abstract
In this work, light-controlled bubble-propelled single-component metal oxide tubular microengines have for the first time been demonstrated. For such a simple single-component TiO2 tubular microengine in H2O2 aqueous solution under UV irradiation, when the inner diameter and length of the tube are regulated, the O2 molecules will nucleate and grow into bubbles preferentially on the inner concave surface rather than on the outer surface, resulting in a vital propulsion of the microengine. More importantly, the motion state and speed can be modulated reversibly, fast (the response time is less than 0.2 s) and wirelessly by adjusting UV irradiation. Consequently, the as-developed TiO2 tubular microengine promises potential challenged applications related to photocatalysis, such as "on-the-fly" photocatalytic degradation of organic pollutes and photocatalytic inactivation of bacteria due to the low cost, single component, and simple structure, as well as the facile fabrication in a large-scale.
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Affiliation(s)
- Fangzhi Mou
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P.R. China
| | - Yan Li
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P.R. China
| | - Chuanrui Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P.R. China
| | - Wei Li
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P.R. China
| | - Yixia Yin
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P.R. China
| | - Huiru Ma
- Department of Chemistry, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P.R. China
| | - Jianguo Guan
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P.R. China
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Theoretical Verification of Photoelectrochemical Water Oxidation Using Nanocrystalline TiO2 Electrodes. Molecules 2015; 20:9732-44. [PMID: 26023936 PMCID: PMC6272316 DOI: 10.3390/molecules20069732] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 05/12/2015] [Indexed: 11/17/2022] Open
Abstract
Mesoscopic anatase nanocrystalline TiO2 (nc-TiO2) electrodes play effective and efficient catalytic roles in photoelectrochemical (PEC) H2O oxidation under short circuit energy gap excitation conditions. Interfacial molecular orbital structures of (H2O)3 &OH(TiO2)9H as a stationary model under neutral conditions and the radical-cation model of [(H2O)3&OH(TiO2)9H]+ as a working nc-TiO2 model are simulated employing a cluster model OH(TiO2)9H (Yamashita/Jono’s model) and a H2O cluster model of (H2O)3 to examine excellent H2O oxidation on nc-TiO2 electrodes in PEC cells. The stationary model, (H2O)3&OH(TiO2)9H reveals that the model surface provides catalytic H2O binding sites through hydrogen bonding, van der Waals and Coulombic interactions. The working model, [(H2O)3&OH(TiO2)9H]+ discloses to have a very narrow energy gap (0.3 eV) between HOMO and LUMO potentials, proving that PEC nc-TiO2 electrodes become conductive at photo-irradiated working conditions. DFT-simulation of stepwise oxidation of a hydroxide ion cluster model of OH−(H2O)3, proves that successive two-electron oxidation leads to hydroxyl radical clusters, which should give hydrogen peroxide as a precursor of oxygen molecules. Under working bias conditions of PEC cells, nc-TiO2 electrodes are now verified to become conductive by energy gap photo-excitation and the electrode surface provides powerful oxidizing sites for successive H2O oxidation to oxygen via hydrogen peroxide.
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Reyes-Gil KR, Robinson DB. WO3-enhanced TiO2 nanotube photoanodes for solar water splitting with simultaneous wastewater treatment. ACS APPLIED MATERIALS & INTERFACES 2013; 5:12400-12410. [PMID: 24195676 DOI: 10.1021/am403369p] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Composite WO3/TiO2 nanostructures with optimal properties that enhance solar photoconversion reactions were developed, characterized, and tested. The TiO2 nanotubes were prepared by anodization of Ti foil and used as substrates for WO3 electrodeposition. The WO3 electrodeposition parameters were controlled to develop unique WO3 nanostructures with enhanced photoelectrochemical properties. Scanning electron microscopy (SEM) images showed that the nanomaterials with optimal photocurrent density have the same ordered structure as TiO2 nanotubes, with an external tubular nanostructured WO3 layer. Diffuse reflectance spectra showed an increase in the visible absorption relative to bare TiO2 nanotubes and in the UV absorption relative to bare WO3 films. Incident simulated solar photon-to-current efficiency (IPCE) increased from 30% (for bare WO3) to 50% (for tubular WO3/TiO2 composites). With the addition of diverse organic pollutants, the photocurrent densities exhibited more than a 5-fold increase. Chemical oxygen demand measurements showed the simultaneous photodegradation of organic pollutants. The results of this work showed that the unique structure and composition of these composite WO3/TiO2 materials enhance the IPCE efficiencies, optical properties, and photodegradation performance compared with the parent materials.
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Affiliation(s)
- Karla R Reyes-Gil
- Sandia National Laboratories , P.O. Box 969, Livermore, California 94551-MS9403, United States
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Regonini D, Teloeken AC, Alves AK, Berutti FA, Gajda-Schrantz K, Bergmann CP, Graule T, Clemens F. Electrospun TiO(2) fiber composite photoelectrodes for water splitting. ACS APPLIED MATERIALS & INTERFACES 2013; 5:11747-11755. [PMID: 24138632 DOI: 10.1021/am403437q] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This work has focused on the development of electrospun TiO2 fiber composite photoelectrodes for hydrogen production by water splitting. For comparison, similar photoelectrodes were also developed using commercial TiO2 (Aeroxide P25) nanoparticles (NPs). Dispersions of either fibers or P25 NPs were used to make homogenous TiO2 films on fluorine-doped SnO2 (FTO) glass substrates by a doctor blade (DB) technique. Scanning electron microscopy (SEM) analysis revealed a much lower packing density of the DB fibers, with respect to DB-P25 TiO2 NPs; this was also directly reflected by the higher photocurrent measured for the NPs when irradiating the photoelectrodes at a light intensity of 1.5AM (1 sun, 1000 W/m(2)). For a better comparison of fibers vs. NPs, composite photoelectrodes by dip-coating (onto FTO) TiO2 sol-gel (SG) matrixes containing an equal amount (5 or 20 wt %) of either fibers or P25 NPs were also investigated. It emerged that the photoactivity of the fibers was significantly higher. For composites containing 5 wt % TiO2 fibers, a photocurrent of 0.5 mA/cm(2) (at 0.23 V vs Ag/AgCl) was measured, whereas 5 wt % P25 NPs only provided 0.2 mA/cm(2). When increasing to 20 wt % fibers or NPs, the photocurrent decreased, because of the formation of microcracks in the photoelectrodes, because of the shrinkage of the sol-gel. The high photoactivity of the fiber-based electrodes could be confirmed by incident photon to current efficiency (IPCE) measurements. Remarkably, the IPCE of composites containing 5 wt % fibers was between 35% and 40% in the region of 380-320 nm, and when accounting for transmission/reflection losses, the absorbed photon to current efficiency (APCE) was consistently over 60% between 380 nm and 320 nm. The superior photoactivity is attributed to the enhanced electron transport in the electrospun fibers, with respect to P25 NPs. According to this study, it is clear that the electronic connectivity ensured by the sol-gel also contributes positively to the enhanced photocurrent.
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Affiliation(s)
- D Regonini
- Laboratory for High Performance Ceramics, EMPA-Swiss Federal Laboratories for Materials Science & Technology , Überlandstrasse 129, 8600 Dübendorf, Switzerland
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21
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Osterloh FE. Inorganic nanostructures for photoelectrochemical and photocatalytic water splitting. Chem Soc Rev 2013; 42:2294-320. [DOI: 10.1039/c2cs35266d] [Citation(s) in RCA: 1658] [Impact Index Per Article: 150.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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22
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Augustynski J, Solarska R. To what extent do the nanostructured photoelectrodes perform better than their macrocrystalline counterparts? Catal Sci Technol 2013. [DOI: 10.1039/c3cy00056g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Berger T, Monllor-Satoca D, Jankulovska M, Lana-Villarreal T, Gómez R. The electrochemistry of nanostructured titanium dioxide electrodes. Chemphyschem 2012; 13:2824-75. [PMID: 22753152 DOI: 10.1002/cphc.201200073] [Citation(s) in RCA: 217] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2012] [Indexed: 11/12/2022]
Abstract
Several of the multiple applications of titanium dioxide nanomaterials are directly related to the introduction or generation of charge carriers in the oxide. Thus, electrochemistry plays a central role in the understanding of the factors that must be controlled for the optimization of the material for each application. Herein, the main conceptual tools needed to address the study of the electrochemical properties of TiO(2) nanostructured electrodes are reviewed, as well as the electrochemical methods to prepare and modify them. Particular attention is paid to the dark electrochemical response of these nanomaterials and its direct connection with the TiO(2) electronic structure, interfacial area and grain boundary density. The physical bases for the generation of currents under illumination are also presented. Emphasis is placed on the fact that the kinetics of charge-carrier transfer to solution determines the sign and value of the photocurrent. Furthermore, methods for extracting kinetic information from open-circuit potential and photocurrent measurements are briefly presented. Some aspects of the combination of electrochemical and spectroscopic measurements are also dealt with. Finally, some of the applications of TiO(2) nanostructured samples derived from their electrochemical properties are concisely reviewed. Particular attention is paid to photocatalytic processes and, to a lesser extent, to photosynthetic reactions as well as to applications related to energy from the aspects of both saving (electrochromic layers) and accumulation (batteries). The use of TiO(2) nanomaterials in solar cells is not covered, as a number of reviews have been published addressing this issue.
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Affiliation(s)
- Thomas Berger
- Institut Universitari d'Electroquímica i Departament de Química Física, Universitat d'Alacant, Apartat 99, 03080 Alacant, Spain
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24
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Peining Z, Yongzhi W, Reddy MV, Sreekumaran Nair A, Shengjie P, Sharma N, Peterson VK, Chowdari BVR, Ramakrishna S. TiO2 nanoparticles synthesized by the molten salt method as a dual functional material for dye-sensitized solar cells. RSC Adv 2012. [DOI: 10.1039/c2ra00041e] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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25
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Hartmann P, Lee DK, Smarsly BM, Janek J. Mesoporous TiO(2): comparison of classical sol-gel and nanoparticle based photoelectrodes for the water splitting reaction. ACS NANO 2010; 4:3147-54. [PMID: 20486697 DOI: 10.1021/nn1004765] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
This paper describes a systematic comparison of the photoelectrochemical properties of mesoporous TiO(2) films prepared by the two most prevalent templating methods: The use of preformed, crystalline nanoparticles is generally considered advantageous compared to the usage of molecular precursors such as TiCl(4), since the latter requires a separate heat treatment at elevated temperature to induce crystallization. However, our photoelectrochemical experiments clearly show that sol-gel derived mesoporous TiO(2) films cause an about 10 times higher efficiency for the water splitting reaction than their counterparts obtained from crystalline TiO(2) nanoparticles. This result indicates that for electrochemical applications the performance of nanoparticle-based metal oxide films might suffer from insufficient electronic connectivity.
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Affiliation(s)
- Pascal Hartmann
- Physikalisch-Chemisches Institut, Justus Liebig University, Giessen Heinrich-Buff-Ring 58, 35392 Giessen, Germany
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27
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Photoanodic oxidation of small organic molecules at nanostructured TiO2 anatase and rutile film electrodes. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2009.08.058] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Roy P, Lynch R, Schmuki P. Electron beam induced in-vacuo Ag deposition on TiO2 from ionic liquids. Electrochem commun 2009. [DOI: 10.1016/j.elecom.2009.05.051] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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29
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30
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Comparison between P25 and anatase-based TiO2 quasi-solid state dye sensitized solar cells. Sci Bull (Beijing) 2008. [DOI: 10.1007/s11434-008-0063-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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Solarska R, Rutkowska I, Augustynski J. Unusual photoelectrochemical behaviour of nanocrystalline TiO2 films. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2007.05.037] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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32
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Perathoner S, Passalacqua R, Centi G, Su DS, Weinberg G. Photoactive titania nanostructured thin films: Synthesis and characteristics of ordered helical nanocoil array. Catal Today 2007. [DOI: 10.1016/j.cattod.2007.01.039] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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33
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Centi G, Passalacqua R, Perathoner S, Su DS, Weinberg G, Schlögl R. Oxide thin films based on ordered arrays of 1D nanostructure. A possible approach toward bridging material gap in catalysis. Phys Chem Chem Phys 2007; 9:4930-8. [PMID: 17912424 DOI: 10.1039/b703326p] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
TiO(2) thin films based on ordered arrays of 1D nanostructures (nanorods, nanotubes) are proposed as suitable model materials in studies for bridging material and complexity gap in catalysis. The samples were prepared by anodic oxidation of Ti foils. By changing the preparation conditions (pH, procedure of application of the potential), different types of 1D nanostructure and different characteristics of the ordered array of these 1D nanostructures could be obtained. This allows studying the effect of nanodimension and 3D nanoarchitecture on the characteristics and reactivity of these catalysts. It is also shown that TiO(2) thin films characterized by a well-ordered array of titania nanorod behave as photonic materials, thus showing unique properties of light harvesting efficiency.
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Affiliation(s)
- Gabriele Centi
- Department of Industrial Chemistry and Engineering of Materials and ELCASS, University of Messina, UdR INSTM, Salita Sperone 31, 98166, Messina, Italy.
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Solarska R, Augustynski J, Sayama K. Viewing nanocrystalline TiO2 photoelectrodes as three-dimensional electrodes: Effect of the electrolyte upon the photocurrent efficiency. Electrochim Acta 2006. [DOI: 10.1016/j.electacta.2006.06.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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36
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Zhao X, Yao W, Wu Y, Zhang S, Yang H, Zhu Y. Fabrication and photoelectrochemical properties of porous ZnWO4 film. J SOLID STATE CHEM 2006. [DOI: 10.1016/j.jssc.2006.05.004] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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37
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38
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Hwang SH, Moorefield CN, Wang P, Fronczek FR, Courtney BH, Newkome GR. Design, synthesis and photoelectrochemical properties of hexagonal metallomacrocycles based on triphenylamine: [M6(4,4′-bis(2,2′:6′,2″-terpyridinyl)triphenylamine)6(X)12]; [M = Fe(ii), PF6−and Zn(ii), BF4−]. Dalton Trans 2006:3518-22. [PMID: 16855752 DOI: 10.1039/b603691k] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of a novel bis(terpyridine) ligand, 4,4'-bis(2,2':6',2''-terpyridinyl)triphenylamine, utilizing triphenylamine, as a specific angle controller, has led to the self-assembly of a unique hexagonal metallomacrocycle family, [Fe6(2)6(PF6)12] and [Zn6(2)6(BF4)12], utilizing terpyridine-metal(II)-terpyridine connectivity. The crystal structure of the novel ligand shows that the angle between the two terpyridinyl moieties is 119.69 degrees , which enabled the formation of the hexagonal-shaped macrocycles. The crystal packing architectures of this starting ligand revealed channels induced by solvent encapsulation. Following complexation of this ligand with transition metals [Fe(II) or Zn(II)] in a one-pot reaction, the resultant structures were characterized by (1)H and (13)C NMR, UV/Vis and mass spectroscopies. The expected metal-to-ligand charge transfer (MLCT; lambda(max) = 582 nm) and emission (lambda(em) = 575 nm) characteristics were exhibited by both [Fe6(2)6(PF6)12] and[Zn6(2)6(BF4)12]. The photoelectrochemical characteristics of these hexagonal metallomacrocycles demonstrate that they can be used as sensitizers in dye-sensitized solar cells.
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Affiliation(s)
- Seok-Ho Hwang
- Departments of Polymer Science and Chemistry, University of Akron, Akron, OH 44325-3909, USA
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39
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Photoelectrochemical behavior of composite metal oxide semiconductor films with a WO3 matrix and occluded Degussa P 25 TiO2 particles. J Electroanal Chem (Lausanne) 2005. [DOI: 10.1016/j.jelechem.2004.11.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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40
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Bustos E, Manríquez J, Echegoyen L, Godínez LA. Preparation, characterization and photoelectrochemical study of mixed C60–Starburst®PAMAM G0.0 dendrimer films anchored on the surface of nanocrystalline TiO2semiconductor electrodes. Chem Commun (Camb) 2005:1613-5. [PMID: 15770277 DOI: 10.1039/b417906d] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanocrystalline TiO2 silanized electrodes were prepared and further modified in a sequential fashion with C60 and Starburst PAMAM G0.0 dendrimers, resulting in a novel photoelectrochemical sensitization film that showed particularly high photocurrent (IPCE) and global photoconversion efficiencies (eta).
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Affiliation(s)
- Erika Bustos
- Electrochemistry Department, Centro de Investigación y Desarrollo Tecnológico en Electroquímica, Querétaro, Mexico
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41
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Jiang D, Zhao H, Zhang S, John R. Characterization of Photoelectrocatalytic Processes at Nanoporous TiO2 Film Electrodes: Photocatalytic Oxidation of Glucose. J Phys Chem B 2003. [DOI: 10.1021/jp0307349] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dianlu Jiang
- School of Environmental and Applied Sciences, Gold Coast Campus, Griffith University, PMB 50, Gold Coast Mail Center, Queensland 9726, Australia
| | - Huijun Zhao
- School of Environmental and Applied Sciences, Gold Coast Campus, Griffith University, PMB 50, Gold Coast Mail Center, Queensland 9726, Australia
| | - Shanqing Zhang
- School of Environmental and Applied Sciences, Gold Coast Campus, Griffith University, PMB 50, Gold Coast Mail Center, Queensland 9726, Australia
| | - Richard John
- School of Environmental and Applied Sciences, Gold Coast Campus, Griffith University, PMB 50, Gold Coast Mail Center, Queensland 9726, Australia
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42
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Shigematsu T, Shimotani K, Manabe C, Watanabe H, Shimizu M. Transport properties of carrier-injected DNA. J Chem Phys 2003. [DOI: 10.1063/1.1541608] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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43
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Macyk W, Burgeth G, Kisch H. Photoelectrochemical properties of platinum(IV) chloride surface modified TiO2. Photochem Photobiol Sci 2003; 2:322-8. [PMID: 12713234 DOI: 10.1039/b211583b] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Anatase (TH), rutile (TiO2-R), and a mixture of anatase and rutile (P25) were surface modified by chemisorbed chloroplatinate(IV) complexes. All materials gave rise to anodic photocurrents when deposited on conducting glass and irradiated in the wavelength range of 330-650 nm. In the presence of formate "current-doubling" factors of 5-7 were measured. Flatband potentials were obtained by the suspension method through recording the photovoltage as function of the pH value. The value of -0.54 V as found for TH is shifted to -0.49, -0.45, and -0.28 V (vs. NHE, pH = 7) when the surface is covered by 1, 2, and 4 wt% of H2[PtCl6], respectively. The flatband potential shifts by 50 and 60 mV per pH unit for P25 and 4% H2[PtCl6]/TH, respectively, as found by a novel method based on the use of different pH-independent redox systems of the bipyridinium type. Whereas the rutile based material was inactive, the TH and P25 samples photocatalyzed the mineralization of 4-CP with visible light. Moreover, the capability of H2[PtCl6]/TH to mineralize also cyanuric acid, the end-product of atrazine decomposition in photocatalytic processes with unmodified TiO2, was observed upon UV and also visible light irradiation. From these experimental results an energy diagram is proposed to rationalize the reactions observed.
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Affiliation(s)
- Wojciech Macyk
- Institute of Inorganic Chemistry, University of Erlangen-Nürnberg Egerlandstr. 1, D-91058 Erlangen, Germany
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44
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Solarska R, Morand R, Augustynski J. Insight Into Electric Potential Distribution Within Mesoporous Titanium Dioxide Films. ACTA ACUST UNITED AC 2003. [DOI: 10.1135/cccc20031596] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Charge transport and potential distribution in mesoporous semiconductor films operating in an electrolyte, especially those composed of TiO2 nanoparticles, are still the subject of wide debate. Herein we describe a series of experiments, performed under band-gap energy illumination of nanostructured TiO2 films, intended to shed new light on the actual electric potential profile across such three-dimensional electrode. Our approach stems from quite a general observation that addition of various electron acceptors to a solution containing an efficient hole scavenger (e.g., methanol, formic acid) results in a marked drop of the maximum photocurrent at the mesoporous TiO2 film electrodes whatever the applied anodic bias might be. We have chosen an electron acceptor, MV2+ dication, which-due to its negative redox potential, more negative than that of the bottom of conduction band of TiO2 in acidic media - causes a drop of the photooxidation current only in alkaline but not in acidic solutions of hole scavengers. Measurements of the incident photon-to-current efficiencies as a function of wavelength show that the drop of the photocurrent after the MV2+ addition, observed in alkaline formate solution extends practically over the whole range of wavelengths. As the optical penetration depth in TiO2 for the wavelengths close to its band edge is expected to match approximately the chosen film thickness, we can conclude that major part of the electric potential drop in the TiO2 electrode occurs actually close to the back contact.
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45
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Morand R, Noworyta K, Augustynski J. Probing interactions between TiO2 photocatalyst and adsorbing species using quartz crystal microbalance. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)01331-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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46
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Sayama K, Augustynski J, Arakawa H. Significant Effect of Carbonate Ions on the Photooxidation of Water on Mesoporous TiO2Film Electrodes. CHEM LETT 2002. [DOI: 10.1246/cl.2002.994] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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47
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Morand R, Lopez C, Koudelka-Hep M, Kedzierzawski P, Augustynski J. Photoelectrochemical Behavior in Low-Conductivity Media of Nanostructured TiO2 Films Deposited on Interdigitated Microelectrode Arrays. J Phys Chem B 2002. [DOI: 10.1021/jp025675y] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robin Morand
- Department of Chemistry, University of Geneva, CH-1211 Geneva 4, Switzerland, Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces, E.N.S.E.E.G., 38402 Saint Martin d'Hères, France, Institute of Microtechnology, University of Neuchâtel, 2007 Neuchâtel, Switzerland, and Institute of Physical Chemistry of Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Christian Lopez
- Department of Chemistry, University of Geneva, CH-1211 Geneva 4, Switzerland, Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces, E.N.S.E.E.G., 38402 Saint Martin d'Hères, France, Institute of Microtechnology, University of Neuchâtel, 2007 Neuchâtel, Switzerland, and Institute of Physical Chemistry of Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Milena Koudelka-Hep
- Department of Chemistry, University of Geneva, CH-1211 Geneva 4, Switzerland, Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces, E.N.S.E.E.G., 38402 Saint Martin d'Hères, France, Institute of Microtechnology, University of Neuchâtel, 2007 Neuchâtel, Switzerland, and Institute of Physical Chemistry of Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Piotr Kedzierzawski
- Department of Chemistry, University of Geneva, CH-1211 Geneva 4, Switzerland, Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces, E.N.S.E.E.G., 38402 Saint Martin d'Hères, France, Institute of Microtechnology, University of Neuchâtel, 2007 Neuchâtel, Switzerland, and Institute of Physical Chemistry of Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Jan Augustynski
- Department of Chemistry, University of Geneva, CH-1211 Geneva 4, Switzerland, Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces, E.N.S.E.E.G., 38402 Saint Martin d'Hères, France, Institute of Microtechnology, University of Neuchâtel, 2007 Neuchâtel, Switzerland, and Institute of Physical Chemistry of Polish Academy of Sciences, 01-224 Warsaw, Poland
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48
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Hanley TL, Luca V, Pickering I, Howe RF. Structure of Titania Sol−Gel Films: A Study by X-Ray Absorption Spectroscopy. J Phys Chem B 2002. [DOI: 10.1021/jp012225h] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tracey L. Hanley
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia, Materials Division, Australian Nuclear Science and Technology Organization, PMB 1, Menai NSW 2234, Australia, Stanford Synchrotron Radiation Laboratory, Menlo Park, California 94025, and Chemistry Department, University of Aberdeen, Aberdeen AB24 3UE, Scotland
| | - Victor Luca
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia, Materials Division, Australian Nuclear Science and Technology Organization, PMB 1, Menai NSW 2234, Australia, Stanford Synchrotron Radiation Laboratory, Menlo Park, California 94025, and Chemistry Department, University of Aberdeen, Aberdeen AB24 3UE, Scotland
| | - Ingrid Pickering
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia, Materials Division, Australian Nuclear Science and Technology Organization, PMB 1, Menai NSW 2234, Australia, Stanford Synchrotron Radiation Laboratory, Menlo Park, California 94025, and Chemistry Department, University of Aberdeen, Aberdeen AB24 3UE, Scotland
| | - Russell F. Howe
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia, Materials Division, Australian Nuclear Science and Technology Organization, PMB 1, Menai NSW 2234, Australia, Stanford Synchrotron Radiation Laboratory, Menlo Park, California 94025, and Chemistry Department, University of Aberdeen, Aberdeen AB24 3UE, Scotland
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Santato C, Odziemkowski M, Ulmann M, Augustynski J. Crystallographically oriented mesoporous WO3 films: synthesis, characterization, and applications. J Am Chem Soc 2001; 123:10639-49. [PMID: 11673995 DOI: 10.1021/ja011315x] [Citation(s) in RCA: 398] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mesoporous semiconducting films consisting of preferentially orientated monoclinic-phase nanocrystals of tungsten trioxide have been prepared using a novel version of the sol-gel method. Transformations undergone by a colloidal solution of tungstic acid, stabilized by an organic additive such as poly(ethylene glycol) (PEG) 300, as a function of the annealing temperature have been followed by means of a confocal Raman microscope. The shape and size of WO3 nanoparticles, the porosity, and the properties of the films depend critically on preparation parameters, such as the tungstic acid/PEG ratio, the PEG chain length, and the annealing conditions. Well-crystallized WO3 films combine excellent photoresponse to the blue region of the solar spectrum, up to 500 nm, with good transparency at wavelengths larger than 550 nm. Particular applications of these nanocrystalline WO3 films include photoelectrochemical and electrochromic devices.
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Affiliation(s)
- C Santato
- Department of Chemistry, University of Geneva, CH-1211 Geneva 4, Switzerland
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