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Yang L, Du J, Deng J, Sulaiman NHM, Feng X, Liu C, Zhou X. Defective Nb 2C MXene Cocatalyst on TiO 2 Microsphere for Enhanced Photocatalytic CO 2 Conversion to Methane. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2307007. [PMID: 38054782 DOI: 10.1002/smll.202307007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 11/12/2023] [Indexed: 12/07/2023]
Abstract
Sustainable and scalable solar-energy-driven CO2 conversion into fuels requires earth-abundant and stable photocatalysts. In this work, a defective Nb2C MXene as a cocatalyst and TiO2 microspheres as photo-absorbers, constructed via a coulombic force-driven self-assembly, is synthesized. Such photocatalyst, at an optimized loading of defective Nb2C MXene (5% def-Nb2C/TiO2), exhibits a CH4 production rate of 7.23 µmol g-1 h-1, which is 3.8 times higher than that of TiO2. The Schottky junction at the interface improves charge transfer from TiO2 to defective Nb2C MXene and the electron-rich feature (nearly free electron states) enables multielectron reaction of CO2, which apparently leads to high activity and selectivity to CH4 (sel. 99.5%) production. Moreover, DFT calculation demonstrates that the Fermi level (EF) of defective Nb2C MXene (-0.3 V vs NHE) is more positive than that of Nb2C MXene (-1.0 V vs NHE), implying a strong capacity to accept photogenerated electrons and enhance carrier lifetime. This work gives a direction to modify the earth-abundant MXene family as cocatalysts to build high-performance photocatalysts for energy production.
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Affiliation(s)
- Lei Yang
- School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
| | - Jiajun Du
- School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
| | - Jun Deng
- School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
| | | | - Xuan Feng
- School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
| | - Chong Liu
- School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
| | - Xuemei Zhou
- School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
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2
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Jeong T, Yeu IW, Ye KH, Yoon S, Kim D, Hwang CS, Choi JH. Study of a charge transition-driven resistive switching mechanism in TiO 2-based random access memory via density functional theory. NANOSCALE 2024; 16:6949-6960. [PMID: 38494908 DOI: 10.1039/d3nr06614b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
The nature of the conducting filament (CF) with a high concentration of oxygen vacancies (VOs) in oxide thin film-based resistive random access memory (RRAM) remains unclear. The VOs in the CF have been assumed to be positively charged (VO2+) to explain the field-driven switching of RRAM, but VO2+ clusters in high concentration encounter Coulomb repulsion, rendering the CF unstable. Therefore, this study examined the oxidation state of VOs in the CF and their effects on the switching behavior via density functional theory calculations using a Pt/TiO2/Ti model system. It was concluded that the VOs in the CF are in a low oxidation state but are transformed to VO2+ immediately after release from the CF. In addition, the short-range interactions between VOs were confirmed to facilitate the rupture and rejuvenation of the CF by reducing the required activation energy. Finally, an improved switching model was proposed by considering the charge transition of VOs, providing a plausible explanation for the reported coexistence of two opposite bipolar switching polarities: the eight-wise and the counter-eight-wise polarities.
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Affiliation(s)
- Taeyoung Jeong
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea.
- Department of Materials Science and Engineering and Inter-University Semiconductor Research Center, Seoul National University, Seoul 08826, Korea.
| | - In Won Yeu
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea.
| | - Kun Hee Ye
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea.
- Department of Materials Science and Engineering and Inter-University Semiconductor Research Center, Seoul National University, Seoul 08826, Korea.
| | - Seungjae Yoon
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea.
- Department of Materials Science and Engineering and Inter-University Semiconductor Research Center, Seoul National University, Seoul 08826, Korea.
| | - Dohyun Kim
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea.
- Department of Materials Science and Engineering and Inter-University Semiconductor Research Center, Seoul National University, Seoul 08826, Korea.
| | - Cheol Seong Hwang
- Department of Materials Science and Engineering and Inter-University Semiconductor Research Center, Seoul National University, Seoul 08826, Korea.
| | - Jung-Hae Choi
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea.
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3
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Guan S, Cheng Y, Hao L, Yoshida H, Tarashima C, Zhan T, Itoi T, Qiu T, Lu Y. Oxygen vacancies induced band gap narrowing for efficient visible-light response in carbon-doped TiO 2. Sci Rep 2023; 13:14105. [PMID: 37644040 PMCID: PMC10465500 DOI: 10.1038/s41598-023-39523-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 07/26/2023] [Indexed: 08/31/2023] Open
Abstract
The band gap of rutile TiO2 has been narrowed, via the formation of oxygen vacancies (OVs) during heat treatment in carbon powder (cHT) with embedding TiO2 coatings. The narrowed band gap efficiently improves the visible light response of TiO2 coatings, to further enhance the visible-light-driven photocatalytic activity. The change in OVs during cHT has been studied by manipulation of cHT temperature and time. The effect of OVs on the band structure of nonstoichiometric TiO2-x has been further calculated by first-principles calculations. With raising the temperature, SEM images show that the nano-size fiber-like structure forms on the surface of TiO2 coatings, and the amount of the fiber-like structure significantly increases and their size changes from nano to micro under 800 °C, contributing to cause an increase in accessible surface area. The UV-Vis results reveal that the band gap of TiO2 has been narrowed during cHT, due to the formed oxygen vacancies. The XPS results further confirm that the formation of surface defects including OVs, and the XPS depth profile further shows the decreased relative amount of O whereas increased relative amount of carbon. Notably, after cHT for TiO2 coatings, the photocatalytic activity first increases then decreases with raising the temperature, achieving approximately 3 times at 850 °C. The first-principles calculation suggest that the OVs in TiO2 coatings with localized electrons could facilitate the band gap narrowing, further favoring to enhance the photocatalytic activity under visible light.
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Affiliation(s)
- Sujun Guan
- Research Center for Space System Innovation, Tokyo University of Science, Chiba, Japan
| | - Yanling Cheng
- Beijing Key Laboratory of Biomass Waste Resource Utilization, Beijing Union University, Beijing, China.
| | - Liang Hao
- College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin, China
| | | | - Chiaki Tarashima
- Research Center for Space System Innovation, Tokyo University of Science, Chiba, Japan
| | - Tianzhuo Zhan
- Bio-Nano Electronics Research Centre, Toyo University, Saitama, Japan
| | - Takaomi Itoi
- Graduate School and Faculty of Engineering, Chiba University, Chiba, Japan
| | - Tangbin Qiu
- Graduate School and Faculty of Engineering, Chiba University, Chiba, Japan
| | - Yun Lu
- Graduate School and Faculty of Engineering, Chiba University, Chiba, Japan.
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Xu F, Zou Q, Xiong G, Zhang H, Wang F, Wang Y. Activated Single‐Phase Ti
4
O
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Nanosheets with Efficient Use of Precious Metal for Inspired Oxygen Reduction Reaction. Chemistry 2022; 28:e202202580. [DOI: 10.1002/chem.202202580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Indexed: 11/18/2022]
Affiliation(s)
- Fan Xu
- The School of Electrical Engineering and State Key Laboratory of Power Transmission Equipment &System Security and New Technology Chongqing University 174 Shazheng Street, Shapingba District Chongqing City 400044 P. R. China
| | - Qing Zou
- The School of Electrical Engineering and State Key Laboratory of Power Transmission Equipment &System Security and New Technology Chongqing University 174 Shazheng Street, Shapingba District Chongqing City 400044 P. R. China
| | - Gangquan Xiong
- The School of Electrical Engineering and State Key Laboratory of Power Transmission Equipment &System Security and New Technology Chongqing University 174 Shazheng Street, Shapingba District Chongqing City 400044 P. R. China
| | - Huijuan Zhang
- The School of Chemistry and Chemical Engineering Chongqing University 174 Shazheng Street, Shapingba District Chongqing City 400044 P. R. China
| | - Feipeng Wang
- The School of Electrical Engineering and State Key Laboratory of Power Transmission Equipment &System Security and New Technology Chongqing University 174 Shazheng Street, Shapingba District Chongqing City 400044 P. R. China
| | - Yu Wang
- The School of Electrical Engineering and State Key Laboratory of Power Transmission Equipment &System Security and New Technology Chongqing University 174 Shazheng Street, Shapingba District Chongqing City 400044 P. R. China
- The School of Chemistry and Chemical Engineering Chongqing University 174 Shazheng Street, Shapingba District Chongqing City 400044 P. R. China
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Kumar A, Barbhuiya NH, Singh SP. Magnéli phase titanium sub-oxides synthesis, fabrication and its application for environmental remediation: Current status and prospect. CHEMOSPHERE 2022; 307:135878. [PMID: 35932919 DOI: 10.1016/j.chemosphere.2022.135878] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 07/24/2022] [Accepted: 07/26/2022] [Indexed: 06/15/2023]
Abstract
Sub-stoichiometric titanium oxide, also called titanium suboxides (TSO), had been a focus of research for many decades with a chemical composition of TinO2n-1 (n ≥ 1). It has a unique oxygen-deficient crystal structure which provides it an outstanding electrical conductivity and high corrosion resistance similar to ceramic materials. High electrical conductivity and ability to sustain in adverse media make these phases a point of attention for researchers in energy storage and environmental remediation applications. The Magnéli phase-based reactive electroconductive membranes (REM) and electrodes have demonstrated the electrochemical oxidation of pollutants in the water in flow-through and flow by configuration. Additionally, it has also shown its potential for visible light photochemical degradation as well. This review attempts to summarize state of the art in various Magnéli phases materials synthesis routes and their electrochemical and photochemical ability for environmental application. The manuscript introduces the Magnéli phase, its crystal structure, and catalytic properties, followed by the recent development in synthesis methods from diverse titanium sources, notably TiO2 through thermal reduction. The various fabrication methods for Magnéli phase-base REMs and electrodes have also been summarized. Furthermore, the article discussed the environmental remediations via electrochemical and photochemical advanced oxidation processes. Additionally, the hybrid technology with REMs and electrodes is used to counter membrane biofouling and develop electrochemical sensing devices for the pollutants. The Magnéli phase materials have a bright future for both electrochemical and photochemical advanced oxidation of emerging contaminants in water and wastewater treatment.
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Affiliation(s)
- Ashish Kumar
- Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Najmul H Barbhuiya
- Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Swatantra P Singh
- Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai, 400076, India; Centre for Research in Nanotechnology & Science (CRNTS), Indian Institute of Technology Bombay, Mumbai, 400076, India; Interdisciplinary Program in Climate Studies, Indian Institute of Technology Bombay, Mumbai, 400076, India.
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6
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Wawrzyniak J, Karczewski J, Coy E, Ryl J, Grochowska K, Siuzdak K. Nanostructure of the laser-modified transition metal nanocomposites for water splitting. NANOTECHNOLOGY 2022; 33:205401. [PMID: 35108692 DOI: 10.1088/1361-6528/ac512a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 02/02/2022] [Indexed: 06/14/2023]
Abstract
Although hydrogen is considered by many to be the green fuel of the future, nowadays it is primarily produced through steam reforming, which is a process far from ecological. Therefore, emphasis is being put on the development of electrodes capable of the efficient production of hydrogen and oxygen from water. To make the green alternative possible, the solution should be cost-efficient and well processable, generating less waste which is a huge challenge. In this work, the laser-based modification technique of the titania nanotubes containing sputtered transition metal species (Fe, Co, Ni, and Cu) was employed. The characteristics of the electrodes are provided both for the hydrogen and oxygen evolution reactions, where the influence of the laser treatment has been found to have the opposite effect. The structural and chemical analysis of the substrate material provides insight into pathways towards more efficient, low-temperature water splitting. Laser-assisted integration of transition metal with the tubular nanostructure results in the match-like structure where the metal species are accumulated at the head. The electrochemical data indicates a significant decrease in material resistance that leads to an overpotential of only +0.69 V at 10 mA cm-2for nickel-modified material.
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Affiliation(s)
- Jakub Wawrzyniak
- The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdansk, Poland
| | - Jakub Karczewski
- Faculty of Applied Physics and Mathematics, Institute of Nanotechnology and Materials Engineering, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
| | - Emerson Coy
- NanoBioMedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3, 61-614 Poznan, Poland
| | - Jacek Ryl
- Faculty of Applied Physics and Mathematics, Institute of Nanotechnology and Materials Engineering, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
| | - Katarzyna Grochowska
- The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdansk, Poland
| | - Katarzyna Siuzdak
- The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdansk, Poland
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7
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Modified Approach Using Mentha arvensis in the Synthesis of ZnO Nanoparticles—Textural, Structural, and Photocatalytic Properties. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12031096] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Zinc oxide arouses considerable interest since it has many applications—in microelectronics, environmental decontaminations, biomedicine, photocatalysis, corrosion, etc. The present investigation describes the green synthesis of nanosized ZnO particles using a low-cost, ecologically friendly approach compared to the classical methods, which are aimed at limiting their harmful effects on the environment. In this study, ZnO nanoparticles were prepared using an extract of Mentha arvensis (MA) leaves as a stabilizing/reducing agent, followed by hydrothermal treatment at 180 °C. The resulting powder samples were characterized by X-ray diffraction (XRD) phase analysis, infrared spectroscopy (IRS), scanning electron microscopy (SEM), and electron paramagnetic resonance (EPR). The specific surface area and pore size distribution were measured by the Brunauer–Emmett–Taylor (BET) method. Electronic paramagnetic resonance spectra were recorded at room temperature and at 123 K by a JEOL JES-FA 100 EPR spectrometer. The intensity of the bands within the range of 400–1700 cm−1 for biosynthesized ZnO (BS-Zn) powders decreased with the increase in the Mentha arvensis extract concentration. Upon increasing the plant extract concentration, the relative proportion of mesopores in the BS-Zn samples also increased. It was established that the photocatalytic performance of the biosynthesized powders was dependent on the MA concentration in the precursor solution. According to EPR and PL analyses, it was proved that there was a presence of singly ionized oxygen vacancies (V0+) and zinc interstitials (Zni). The use of the plant extract led to changes in the morphology, phase composition, and structure of the ZnO particles, which were responsible for the increased photocatalytic rate of discoloration of Malachite Green dye.
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8
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Zhang T, Han X, Nguyen NT, Yang L, Zhou X. TiO2-based photocatalysts for CO2 reduction and solar fuel generation. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(21)64045-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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9
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Reduced TiO2 nanotube array as an excellent cathode for hydrogen evolution reaction in alkaline solution. Catal Today 2021. [DOI: 10.1016/j.cattod.2021.12.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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10
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Abstract
A pure Ti target in Ar/O2 gas mixture was used to synthesize Ti3Ox thin film on a glass substrate by Reactive High-Power Impulse Magnetron Sputtering (HiPIMS) under different sputtering power (2 and 2.5 kW). The influence of HiPIMS parameters on thin films’ structural, morphological, chemical composition, optical and photocatalytic, and antibacterial properties was investigated. In this study, Ti3Ox thin films can be synthesized using the HiPIMS method without the post-annealing process. Two co-existence phases (hexagonal Ti3O and base-centered monoclinic Ti3O5 phases) existed on the Ti3Ox films. It is found that the peak intensity of (006) Ti3O hexagonal slightly increased as the sputtering power increased from 2 to 2.5 kW. The Ti3Ox thin-film bandgap values were 3.36 and 3.50 eV for 2 and 2.5 kW, respectively. The Ti3Ox films deposited at 2.5 kW showed good photocatalytic activity under UV light irradiation, with a higher methylene blue dye degradation rate than TiO2 thin films. The antibacterial study on Ti3Ox thin films exhibited a high inhibition percentage against E. coli and S. aureus. This study demonstrates that Ti3Ox thin films can promote high photocatalytic and antibacterial activity.
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11
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Wakayama H, Yamazaki K. Low-Cost Bipolar Plates of Ti 4O 7-Coated Ti for Water Electrolysis with Polymer Electrolyte Membranes. ACS OMEGA 2021; 6:4161-4166. [PMID: 33644539 PMCID: PMC7906596 DOI: 10.1021/acsomega.0c04786] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 12/28/2020] [Indexed: 05/23/2023]
Abstract
Although hydrogen is expected to play an important role in the storage of energy from renewable energy sources, technology to produce hydrogen at low cost is needed for its widespread use. The key to the low-cost production of hydrogen with a polymer electrolyte membrane (PEM) water electrolysis system, which is widely used today, is to replace the Au- or Pt-coated Ti with a low-cost material that can be manufactured from inexpensive, corrosion-resistant, and conductive components. We studied titanium suboxide (Ti4O7)-coated titanium (Ti) bipolar plates, which can be substituted for commonly used Pt-coated Ti bipolar plates, as an inexpensive way of producing the PEM water electrolysis system. The water electrolysis characteristics of the cell were evaluated using Ti4O7-sputtered Ti for the bipolar plates of the water electrolysis cell, and the applicability of Ti4O7-sputtered Ti was investigated. The Ti4O7-sputtered Ti had a very low contact resistance (4-5 mΩ cm2) before and after voltage application that was equivalent to that of gold or platinum plating. The efficiency of water electrolysis in this study was comparable to those of previous reports using bipolar plates coated with precious metals. This development opens the door for fabrication of low-cost electrolyzers as well as related electrochemical devices such as fuel cells, sensors, catalysts, and air or liquid cleaning devices.
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12
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Ti nO 2n-1 Suboxide Phases in TiO 2/C Nanocomposites Engineered by Non-hydrolytic Sol-Gel with Enhanced Electrocatalytic Properties. NANOMATERIALS 2020; 10:nano10091789. [PMID: 32916888 PMCID: PMC7559274 DOI: 10.3390/nano10091789] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 08/28/2020] [Accepted: 09/03/2020] [Indexed: 01/06/2023]
Abstract
We report a non-hydrolytic sol-gel (NHSG) route to engineer original mesoporous TinO2n-1@TiO2/C nanocomposites. The synthetic approach is straightforward, solvent-free, additive-free, and meets the challenge of atom economy, as it merely involves TiCl4 and THF in stoichiometric amounts. We found that these nanocomposites present enhanced electrocatalytic properties towards the oxygen reduction reaction (ORR) in 0.1 M KOH. We believe that these preliminary results will open a window of opportunity for the design of metal suboxides/carbon nanocomposites through NHSG routes.
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Knez D, Dražić G, Chaluvadi SK, Orgiani P, Fabris S, Panaccione G, Rossi G, Ciancio R. Unveiling Oxygen Vacancy Superstructures in Reduced Anatase Thin Films. NANO LETTERS 2020; 20:6444-6451. [PMID: 32794711 DOI: 10.1021/acs.nanolett.0c02125] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Oxygen vacancies are known to play a crucial role in tuning the physical properties and technological applications of titanium dioxide TiO2. Over the last decades, defects in substoichiometric TiO2 have been commonly associated with the formation of TinO2n-x Magnéli phases, which are extended planar defects originating from crystallographic shear planes. By combining advanced transmission electron microscopy techniques, electron energy-loss spectroscopy and atomistic simulations, we reach new understanding of the oxygen vacancy induced structural modulations in anatase, ruling out the earlier shear-plane model. Structural modulations are instead shown to be due to the formation of oxygen vacancy superstructures that extend periodically inside the films, preserving the crystalline order of anatase. Elucidating the structure of oxygen defects in anatase is a crucial step for improving the functionalities of such material system and to engineer devices with targeted properties.
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Affiliation(s)
- Daniel Knez
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, Km 163.5, 34149 Trieste, Italy
| | - Goran Dražić
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1001 Ljubljana, Slovenia
| | - Sandeep Kumar Chaluvadi
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, Km 163.5, 34149 Trieste, Italy
| | - Pasquale Orgiani
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, Km 163.5, 34149 Trieste, Italy
| | - Stefano Fabris
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, Km 163.5, 34149 Trieste, Italy
| | - Giancarlo Panaccione
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, Km 163.5, 34149 Trieste, Italy
| | - Giorgio Rossi
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, Km 163.5, 34149 Trieste, Italy
- Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy
| | - Regina Ciancio
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, Km 163.5, 34149 Trieste, Italy
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Yoo JE, Alshehri AA, Qin S, Bawaked SM, Mostafa MMM, Katabathini N, Fehn D, Schmidt J, Mazare A, Denisov N, Cha G, Meyer K, Schmuki P. Establishing High Photocatalytic H
2
Evolution from Multiwalled Titanate Nanotubes. ChemCatChem 2020. [DOI: 10.1002/cctc.202000281] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jeong Eun Yoo
- Department of Materials Science WW-4, LKOUniversity of Erlangen-Nuremberg Martensstrasse 7 91058 Erlangen Germany
| | - Abdulmohsen Ali Alshehri
- Surface Chemistry and Catalytic Studies Group (SCCS)Department of ChemistryKing Abdulaziz University P.O. Box. 80203 Jeddah 21589 Saudi Arabia
| | - Shanshan Qin
- Department of Materials Science WW-4, LKOUniversity of Erlangen-Nuremberg Martensstrasse 7 91058 Erlangen Germany
| | - Salem Mohamed Bawaked
- Surface Chemistry and Catalytic Studies Group (SCCS)Department of ChemistryKing Abdulaziz University P.O. Box. 80203 Jeddah 21589 Saudi Arabia
| | - Mohamed Mokhtar M. Mostafa
- Surface Chemistry and Catalytic Studies Group (SCCS)Department of ChemistryKing Abdulaziz University P.O. Box. 80203 Jeddah 21589 Saudi Arabia
| | - Narasimharao Katabathini
- Surface Chemistry and Catalytic Studies Group (SCCS)Department of ChemistryKing Abdulaziz University P.O. Box. 80203 Jeddah 21589 Saudi Arabia
| | - Dominik Fehn
- Department of Chemistry and PharmacyInorganic and General ChemistryUniversity of Erlangen-Nuremberg Egerlandstr. 1 91058 Erlangen Germany
| | - Jochen Schmidt
- Department of Chemical and Biological EngineeringUniversity of Erlangen-Nuremberg Cauerstraße 4 91058 Erlangen Germany
| | - Anca Mazare
- Department of Materials Science WW-4, LKOUniversity of Erlangen-Nuremberg Martensstrasse 7 91058 Erlangen Germany
| | - Nikita Denisov
- Department of Materials Science WW-4, LKOUniversity of Erlangen-Nuremberg Martensstrasse 7 91058 Erlangen Germany
| | - Gihoon Cha
- Department of Materials Science WW-4, LKOUniversity of Erlangen-Nuremberg Martensstrasse 7 91058 Erlangen Germany
| | - Karsten Meyer
- Department of Chemistry and PharmacyInorganic and General ChemistryUniversity of Erlangen-Nuremberg Egerlandstr. 1 91058 Erlangen Germany
| | - Patrik Schmuki
- Department of Materials Science WW-4, LKOUniversity of Erlangen-Nuremberg Martensstrasse 7 91058 Erlangen Germany
- Surface Chemistry and Catalytic Studies Group (SCCS)Department of ChemistryKing Abdulaziz University P.O. Box. 80203 Jeddah 21589 Saudi Arabia
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15
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Shi R, Li M, Zhang Y, Lei Y, Zhu Y, Jiang R, He X, Lei Z, Liu Z, Zhu H, Sun J. Design and synthesis of carbon nanofibers decorated by dual-phase TinO2n-1 nanoparticles with synergistic catalytic effect as high performance oxygen reduction reaction catalysts. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136120] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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16
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Daelman N, Hegner FS, Rellán-Piñeiro M, Capdevila-Cortada M, García-Muelas R, López N. Quasi-degenerate states and their dynamics in oxygen deficient reducible metal oxides. J Chem Phys 2020; 152:050901. [PMID: 32035446 DOI: 10.1063/1.5138484] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The physical and chemical properties of oxides are defined by the presence of oxygen vacancies. Experimentally, non-defective structures are almost impossible to achieve due to synthetic constraints. Therefore, it is crucial to account for vacancies when evaluating the characteristics of these materials. The electronic structure of oxygen-depleted oxides deeply differs from that of the native forms, in particular, of reducible metal oxides, where excess electrons can localize in various distinct positions. In this perspective, we present recent developments from our group describing the complexity of these defective materials that highlight the need for an accurate description of (i) intrinsic vacancies in polar terminations, (ii) multiple geometries and complex electronic structures with several states attainable at typical working conditions, and (iii) the associated dynamics for both vacancy diffusion and the coexistence of more than one electronic structure. All these aspects widen our current understanding of defects in oxides and need to be adequately introduced in emerging high-throughput screening methodologies.
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Affiliation(s)
- Nathan Daelman
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Franziska Simone Hegner
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Marcos Rellán-Piñeiro
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Marçal Capdevila-Cortada
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Rodrigo García-Muelas
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Núria López
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
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17
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Lopes D, Daniel-da-Silva AL, Sarabando AR, Arias-Serrano BI, Rodríguez-Aguado E, Rodríguez-Castellón E, Trindade T, Frade JR, Kovalevsky AV. Design of Multifunctional Titania-Based Photocatalysts by Controlled Redox Reactions. MATERIALS 2020; 13:ma13030758. [PMID: 32046064 PMCID: PMC7040659 DOI: 10.3390/ma13030758] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 01/27/2020] [Accepted: 02/05/2020] [Indexed: 11/16/2022]
Abstract
This work aims at the preparation of multifunctional titania-based photocatalysts with inherent capabilities for thermal co-activation and stabilisation of anatase polymorph, by designing the phase composition and microstructure of rutile-silicon carbide mixture. The processing involved a conventional solid state route, including partial pre-reduction of rutile by SiC in inert Ar atmosphere, followed by post-oxidation in air. The impacts of processing conditions on the phase composition and photocatalytic activity were evaluated using Taguchi planning. The XRD studies confirmed the presence of rutile/anatase mixtures in the post-oxidised samples. The results emphasise that pre-reduction and post-oxidation temperatures are critical in defining the phase composition, while post-oxidation time is relevant for the photocatalytic performance. Microstructural studies revealed the formation of core-shell particles, which can suppress the photocatalytic activity. The highest apparent reaction rate of the photodegradation of methylene blue was observed for the sample pre-reduced in Ar at 1300 °C for 5 h and then calcined in air at 400 °C for 25 h. Though its performance was ~1.6-times lower than that for the same amount of nanostructured industrial P25 photocatalyst, it was achieved in the material possessing 2–3 times lower surface area and containing ~50 mol% of SiO2 and SiC, thus demonstrating excellent prospects for further improvements.
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Affiliation(s)
- Diogo Lopes
- CICECO–Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal; (D.L.); (B.I.A.-S.); (J.R.F.)
| | - Ana Luísa Daniel-da-Silva
- CICECO–Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal; (A.L.D.-d.-S.); (T.T.)
| | - Artur R. Sarabando
- CICECO–Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal; (D.L.); (B.I.A.-S.); (J.R.F.)
| | - Blanca I. Arias-Serrano
- CICECO–Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal; (D.L.); (B.I.A.-S.); (J.R.F.)
| | - Elena Rodríguez-Aguado
- Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain; (E.R.-A.); (E.R.-C.)
| | - Enrique Rodríguez-Castellón
- Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain; (E.R.-A.); (E.R.-C.)
| | - Tito Trindade
- CICECO–Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal; (A.L.D.-d.-S.); (T.T.)
| | - Jorge R. Frade
- CICECO–Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal; (D.L.); (B.I.A.-S.); (J.R.F.)
| | - Andrei V. Kovalevsky
- CICECO–Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal; (D.L.); (B.I.A.-S.); (J.R.F.)
- Correspondence:
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18
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Zhen W, Yuan X, Ning X, Gong X, Xue C. Building Oxime-Ni 2+ Complex on Polymeric Carbon Nitride: Molecular-Level Design of Highly Efficient Hydrogen Generation Photocatalysts. ACS APPLIED MATERIALS & INTERFACES 2020; 12:868-876. [PMID: 31816223 DOI: 10.1021/acsami.9b18856] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report an effective strategy to in situ construct the oxime-Ni2+ complex unit on polymeric carbon nitride (PCN) as a molecular catalyst for the highly efficient hydrogen evolution reaction (HER). The PCN was functionalized with oxime groups that allowed for immobilizing Ni2+ to form oxime-Ni2+ complex units on the PCN surface with uniform distribution. The electrochemical characterizations reveal that these oxime-Ni2+ units can effectively capture photogenerated electrons from PCN and serve as active catalytic sites for proton reduction. Notably, the oxime-Ni2+ enriched PCN showed even higher activities for photocatalytic hydrogen evolution than the Pt-loaded PCN. This work provides a new way to synthesize low-cost photocatalysts with surface grafting of noble-metal-free molecular HER catalysts for efficient light-driven hydrogen generation.
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Affiliation(s)
- Wenlong Zhen
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 Singapore
| | - Xu Yuan
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 Singapore
| | - Xiaofeng Ning
- State Key Laboratory for Oxo Synthesis and Selective Oxidation , Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000 , P. R. China
| | - Xuezhong Gong
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 Singapore
| | - Can Xue
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 Singapore
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19
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Liu X, Min S, Wang F, Zhang Z. Confining Mo-activated CoS x active sites within MCM-41 for highly efficient dye-sensitized photocatalytic H 2 evolution. J Colloid Interface Sci 2019; 563:112-121. [PMID: 31869582 DOI: 10.1016/j.jcis.2019.12.060] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Revised: 12/13/2019] [Accepted: 12/15/2019] [Indexed: 01/29/2023]
Abstract
Although transition-metal-based sulfides have been identified as efficient catalysts to replace expensive noble metal catalysts for photocatalytic H2 evolution reaction (HER), their activities are still unsatisfied and could be further improved by controlling their microstructures and electronic structures. Herein, we present an effective strategy to confine highly active Mo-activated CoSx (Mo-CoSx) active sites within MCM-41 frameworks by sulfurization of Co-doped MCM-41 during the in situ photoreduction of [MoS4]2- in Erythrosin B-triethanolamine (ErB-TEOA) system. It is found that Co-MCM-41 offers not only abundant coordinatively unsaturated Co sites to be activated by Mo and S but also large surface area to effectively disperse the in situ generated amorphous Mo-CoSx active sites. Under 520 nm irradiation, the most efficient Mo-CoSx/MCM-41-100 (Si/Co = 100) catalyst exhibits ~7, 3, and 4 times higher H2 evolution activity than free MoSx, free Mo-CoSx, and CoSx/MCM-41-100, respectively, and an apparent quantum yield (AQY) of 12.3% for H2 evolution. Furthermore, when Mo-CoSx/MCM-41-100 was sensitized with a more stable fluorescein (FL) dye, the photocatalytic system shows a sustainable H2 evolution activity in a 20 h reaction, showing the good stability of Mo-CoSx/MCM-41-100 catalyst. This work provides a new insight into the design and development of highly active hybrid H2 evolution catalysts based on transition metals for highly efficient and large-scale solar energy conversion to clean H2 energy.
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Affiliation(s)
- Xiangyu Liu
- School of Chemistry and Chemical Engineering, North Minu University, Yinchuan 750021, PR China; Key Laboratory of Electrochemical Energy Conversion Technology and Application, North Minu University, Yinchuan 750021, PR China; Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, PR China; Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, PR China
| | - Shixiong Min
- School of Chemistry and Chemical Engineering, North Minu University, Yinchuan 750021, PR China; Key Laboratory of Electrochemical Energy Conversion Technology and Application, North Minu University, Yinchuan 750021, PR China; Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, PR China; Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, PR China.
| | - Fang Wang
- School of Chemistry and Chemical Engineering, North Minu University, Yinchuan 750021, PR China; Key Laboratory of Electrochemical Energy Conversion Technology and Application, North Minu University, Yinchuan 750021, PR China; Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, PR China; Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, PR China
| | - Zhengguo Zhang
- School of Chemistry and Chemical Engineering, North Minu University, Yinchuan 750021, PR China; Key Laboratory of Electrochemical Energy Conversion Technology and Application, North Minu University, Yinchuan 750021, PR China; Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, PR China; Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, PR China
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20
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Domaschke M, Strunz L, Peukert W. Single-step aerosol synthesis of oxygen-deficient blue titania. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.05.044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Sharsheeva A, Iglin VA, Nesterov PV, Kuchur OA, Garifullina E, Hey-Hawkins E, Ulasevich SA, Skorb EV, Vinogradov AV, Morozov MI. Light-controllable systems based on TiO2-ZIF-8 composites for targeted drug release: communicating with tumour cells. J Mater Chem B 2019; 7:6810-6821. [DOI: 10.1039/c9tb01377f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A model nanocomposite releases drug within 40 minutes under UV irradiation.
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Affiliation(s)
- Aziza Sharsheeva
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Vadim A. Iglin
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Pavel V. Nesterov
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Oleg A. Kuchur
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Elizaveta Garifullina
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Evamarie Hey-Hawkins
- Faculty of Chemistry and Mineralogy
- Institute of Inorganic Chemistry
- Leipzig University
- D-04103 Leipzig
- Germany
| | - Sviatlana A. Ulasevich
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Ekaterina V. Skorb
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Alexandr V. Vinogradov
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Maxim I. Morozov
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
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22
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Zeng W, Cao S, Qiao L, Zhu A, Ma Q, Xu X, Chen Y, Pan J. Boosting charge separation of Sr2Ta2O7 by Cr doping for enhanced visible light-driven photocatalytic hydrogen generation. Inorg Chem Front 2019. [DOI: 10.1039/c9qi00506d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Visible-light driven Cr-doped Sr2Ta2O7 nanosheets with enhanced photocatalytic performance were prepared by a facile hydrothermal method.
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Affiliation(s)
- Weixuan Zeng
- State Key Laboratory of Powder Metallurgy
- Central South University
- Changsha
- P. R. China
| | - Sheng Cao
- School of Physical Science and Technology
- Guangxi University
- Nanning 530004
- P. R. China
| | - Lulu Qiao
- State Key Laboratory of Powder Metallurgy
- Central South University
- Changsha
- P. R. China
| | - Anquan Zhu
- State Key Laboratory of Powder Metallurgy
- Central South University
- Changsha
- P. R. China
| | - Quanyin Ma
- State Key Laboratory of Powder Metallurgy
- Central South University
- Changsha
- P. R. China
| | - Xiewen Xu
- College of Material Science and Engineering
- Changsha University of Science and Technology
- Changsha
- P. R. China
| | - Yi Chen
- Hunan Provincial Key Laboratory of Comprehensive Utilization of Agricultural and Animal Husbandry Waste Resources
- College of Urban and Environmental Sciences
- Hunan University of Technology
- Zhuzhou
- P. R. China
| | - Jun Pan
- State Key Laboratory of Powder Metallurgy
- Central South University
- Changsha
- P. R. China
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