101
|
Crystalline phase transformation of electrospinning TiO2 nanofibres carried out by high temperature annealing. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.05.092] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
102
|
Krysova H, Zlamalova M, Tarabkova H, Jirkovsky J, Frank O, Kohout M, Kavan L. Rutile TiO2 thin film electrodes with excellent blocking function and optical transparency. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.134685] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
103
|
James EM, Bennett MT, Bangle RE, Meyer GJ. Electron Localization and Transport in SnO 2/TiO 2 Mesoporous Thin Films: Evidence for a SnO 2/Sn xTi 1-xO 2/TiO 2 Structure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:12694-12703. [PMID: 31433656 DOI: 10.1021/acs.langmuir.9b02216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A study of SnO2/TiO2 core/shell films was undertaken to investigate the influences of shell thickness and post deposition sintering on electron localization and transport properties. Electrochemical reduction of the materials resulted in the appearance of a broad visible-near IR absorbance that provided insights into the electronic state(s) within the core/shell structures. As the shell thickness was increased from 0.5 to 5 nm, evidence for the presence of a SnxTi1-xO2 interfacial state emerged that was physically located between the core and the shell. The lifetime of photoinjected electrons increased with the shell thickness. Electron transport occurred through the SnO2 core; however, when materials with shell thicknesses ≥2 nm were annealed at 450 °C, a new electron transport pathway through the shell was evident. The data indicate that these materials are best described as SnO2/SnxTi1-xO2/TiO2 where electrons preferentially localize in a SnxTi1-xO2 interfacial state and transport through SnO2 and annealed TiO2 (if present). The implications of these results for applications in solar energy conversion are discussed.
Collapse
Affiliation(s)
- Erica M James
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Marc T Bennett
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Rachel E Bangle
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| | - Gerald J Meyer
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599 , United States
| |
Collapse
|
104
|
Zhang Y, Li L, Liu Y, Feng T, Xi S, Wang X, Xue C, Qian J, Li G. A symbiotic hetero-nanocomposite that stabilizes unprecedented CaCl 2-type TiO 2 for enhanced solar-driven hydrogen evolution reaction. Chem Sci 2019; 10:8323-8330. [PMID: 31803409 PMCID: PMC6839608 DOI: 10.1039/c9sc01216h] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 07/22/2019] [Indexed: 11/21/2022] Open
Abstract
Symbiotic hetero-nanocomposites prevail in many classes of minerals, functional substances and/or devices. However, design and development of a symbiotic hetero-nanocomposite that contains unachievable phases remain a significant challenge owing to the tedious formation conditions and the need for precise control over atomic nucleation in synthetic chemistry. Herein, we report a solution chemistry approach for a symbiotic hetero-nanocomposite that contains an unprecedented CaCl2-type titania phase inter-grown with rutile TiO2. CaCl2 structured TiO2, usually occurring when bulk rutile-TiO2 is compressed at an extreme pressure of several GPa, is identified to be a distorted structure with a tilt of adjacent ribbons of the c-axis of rutile. The structural specificity of the symbiotic CaCl2/rutile TiO2 hetero-nanocomposite was confirmed by Rietveld refinement, HRTEM, EXAFS, and Raman spectra, and the formation region (TiCl4 concentration vs. reaction temperature) was obtained by mapping the phase diagram. Due to the symbiotic relationship, this CaCl2-type TiO2 maintained a high stability via tight connection by edge dislocations with rutile TiO2, thus forming a CaCl2/rutile TiO2 heterojunction with a higher reduction capacity and enhanced charge separation efficiency. These merits endow symbiotic CaCl2/rutile TiO2 with a water splitting activity far superior to that of the commercial benchmark photocatalyst, P25 under simulated sunlight without the assistance of a cocatalyst. Our findings reported here may offer several useful understandings of the mechanical intergrowth process in functional symbiotic hetero-nanocomposites for super interfacial charge separation, where interfacial dislocation appears to be a universal cause.
Collapse
Affiliation(s)
- Yuelan Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China .
| | - Liping Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China .
| | - Yan Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China .
| | - Tao Feng
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China .
| | - Shibo Xi
- Institute of Chemical and Engineering Sciences , ASTAR , 1 Pesek Road, Jurong Island , Singapore 627833 , Singapore
| | - Xiyang Wang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China .
| | - Chenglin Xue
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China .
| | - Jingyu Qian
- State Key Laboratory of Supramolecular Structure and Materials , College of Chemistry , Jilin University , Changchun 130012 , P. R. China
| | - Guangshe Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China .
| |
Collapse
|
105
|
Wang L, Yang G, Wang J, Wang S, Wang C, Peng S, Yan W, Ramakrishna S. In Situ Fabrication of Branched TiO 2 /C Nanofibers as Binder-Free and Free-Standing Anodes for High-Performance Sodium-Ion Batteries. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1901584. [PMID: 31162819 DOI: 10.1002/smll.201901584] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 05/15/2019] [Indexed: 05/23/2023]
Abstract
Herein, 1D free-standing and binder-free hierarchically branched TiO2 /C nanofibers (denoted as BT/C NFs) based on an in situ fabrication method as an anode for sodium-ion batteries are reported. The in situ fabrication endows this material with large surface area and strong structural stability, providing this material with abundant active sites and smooth channels for fast ion transportation. As a result, BT/C NFs with the character of free-standing membranes are directly used as binder-free anode for sodium-ion batteries, delivering a capacity of 284 mA h g-1 at a current density of 200 mA g-1 after 1000 cycles. Even at a high current density of 2000 mA g-1 , the reversible capacity can still achieve as high as 204 mA h g-1 . By means of kinetic analysis, it is demonstrated that the remarkable surface pseudocapacitive behavior is also a major factor to achieve excellent performance. The rationally designed structure coupled with the inherent pseudocapacitive behavior gives this material potential for sodium-ion batteries.
Collapse
Affiliation(s)
- Ling Wang
- Department of Environmental Science & Engineering, State Key of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Guorui Yang
- Department of Environmental Science & Engineering, State Key of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Jianan Wang
- Department of Environmental Science & Engineering, State Key of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Silan Wang
- Department of Environmental Science & Engineering, State Key of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Caiyun Wang
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, New South Wales, 2522, Australia
| | - Shengjie Peng
- Department of Mechanical Engineering, National University of Singapore, Singapore, 117574, Singapore
| | - Wei Yan
- Department of Environmental Science & Engineering, State Key of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Seeram Ramakrishna
- Department of Mechanical Engineering, National University of Singapore, Singapore, 117574, Singapore
| |
Collapse
|
106
|
Hydrothermal Synthesis of Layered Titanium Phosphate Ti2O2H(PO4)[(NH4)2PO4]2 and Its Potential Application in Cosmetics. CRYSTALS 2019. [DOI: 10.3390/cryst9070332] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Titanium phosphates were recently revealed as promising cosmetic pigments; however, their photocatalytic activity and sun protective factor (SPF) levels have not been investigated in detail. In this study, we used hydrothermal conditions to prepare nanocrystalline anatase, brookite, and layered titanium phosphate using the titanium lactate complex, NH4H2PO4, and urea as precursors. The samples were characterized by powder X-ray diffraction (XRD) in addition to Raman spectroscopy, transmission and scanning electron microscopy (TEM, SEM), energy-dispersive X-ray spectroscopy (EDX), and UV-Vis spectroscopy. Furthermore, the photocatalytic activity, sun protective factor, and moisture retention ability were determined for the samples. Brookite exhibited the highest SPF value and anatase the lowest, while Ti2O2H(PO4)[(NH4)2PO4]2 displayed highly promising UV protection and moisture retention properties and, therefore, represents a polyfunctional pigment that is particularly well suited for cosmetic applications.
Collapse
|
107
|
Nuguid RJG, Ferri D, Marberger A, Nachtegaal M, Kröcher O. Modulated Excitation Raman Spectroscopy of V2O5/TiO2: Mechanistic Insights into the Selective Catalytic Reduction of NO with NH3. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01514] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rob Jeremiah G. Nuguid
- Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
- Institute of Chemical Sciences and Engineering, École polytechnique fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Davide Ferri
- Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Adrian Marberger
- Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
- Institute of Chemical Sciences and Engineering, École polytechnique fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | | | - Oliver Kröcher
- Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
- Institute of Chemical Sciences and Engineering, École polytechnique fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| |
Collapse
|
108
|
Poluboyarinov AS, Chelpanov VI, Lebedev VA, Kozlov DA, Khazova KM, Volkov DS, Kolesnik IV, Garshev AV. Titanium Oxide Microspheres with Tunable Size and Phase Composition. MATERIALS 2019; 12:ma12091472. [PMID: 31067714 PMCID: PMC6539129 DOI: 10.3390/ma12091472] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 04/30/2019] [Accepted: 05/02/2019] [Indexed: 11/25/2022]
Abstract
Due to their unique physical and chemical properties, monodisperse titanium oxide microspheres can be used in dye-sensitized solar cells, as cosmetic pigments, and for other applications. However, the synthesis of microspheres with narrow size distribution, desired phase composition, and porosity is still a challenge. In this work, spherical titania particles with controllable size, crystallinity, and pore size were obtained by Ti(OnBu)4 hydrolysis in ethanol. The influence of NaOH addition on the particles’ size and morphology was investigated for the first time. Particle diameter can be tailored from 300 nm to 1.5 μm by changing water and NaOH concentrations. Particle size was analyzed by the statistical processing of scanning electron microscopy (SEM) images and differential centrifugal sedimentation (DCS) measurements. Optical properties of the microspheres were studied by diffuse reflectance UV-Vis spectroscopy. Thermal and hydrothermal treatment allowed transforming amorphous phase in as-prepared particles into nanocrystalline anatase and/or rutile. Transmission electron microscopy (TEM) study of the lamellae, cut out from spherical particles using focused ion beam (FIB), revealed that as-synthesized microspheres are non-hollow, homogeneous, and crystallize throughout the whole volume of the particle. The spherical particles possess photoprotective properties; the highest sun protection factor (SPF) was observed for amorphous microspheres.
Collapse
Affiliation(s)
- Anton S Poluboyarinov
- Faculty of Materials Science, Lomonosov Moscow State University, Leninskiye Hills 1, Moscow 119234, Russia.
| | - Vitaly I Chelpanov
- Baikov Institute of Metallurgy and Material Science RAS, Leninsky Avenue 49, Moscow 119334, Russia.
| | - Vasily A Lebedev
- Faculty of Chemistry, Lomonosov Moscow State University, Leninskiye Hills 1, Moscow 119234, Russia.
| | - Daniil A Kozlov
- Faculty of Materials Science, Lomonosov Moscow State University, Leninskiye Hills 1, Moscow 119234, Russia.
- Institute of General Inorganic Chemistry RAS, Leninsky Avenue 31, Moscow 119071, Russia.
| | - Kristina M Khazova
- Faculty of Materials Science, Lomonosov Moscow State University, Leninskiye Hills 1, Moscow 119234, Russia.
| | - Dmitry S Volkov
- Faculty of Chemistry, Lomonosov Moscow State University, Leninskiye Hills 1, Moscow 119234, Russia.
| | - Irina V Kolesnik
- Faculty of Materials Science, Lomonosov Moscow State University, Leninskiye Hills 1, Moscow 119234, Russia.
- Faculty of Chemistry, Lomonosov Moscow State University, Leninskiye Hills 1, Moscow 119234, Russia.
- Institute of General Inorganic Chemistry RAS, Leninsky Avenue 31, Moscow 119071, Russia.
| | - Alexey V Garshev
- Faculty of Materials Science, Lomonosov Moscow State University, Leninskiye Hills 1, Moscow 119234, Russia.
- Faculty of Chemistry, Lomonosov Moscow State University, Leninskiye Hills 1, Moscow 119234, Russia.
| |
Collapse
|
109
|
Role of temperature and NiO addition in improving photocatalytic properties of TiO2 nanotubes. APPLIED NANOSCIENCE 2019. [DOI: 10.1007/s13204-019-00980-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
110
|
One pot synthesis of TiO2:Eu3+ hierarchical structures as a highly specific luminescent sensing probe for the visualization of latent fingerprints. J RARE EARTH 2019. [DOI: 10.1016/j.jre.2018.05.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
111
|
Khosravi M, Feizi H, Haghighi B, Najafpour MM. A simple, facile and low-cost method for the preparation of mixed-phase titanium oxide: toward efficient photoelectrochemical water oxidation. NEW J CHEM 2019. [DOI: 10.1039/c9nj00961b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new, low-cost and facile procedure for the preparation of a titanium oxide photocatalyst on a titanium electrode through simple high-voltage anodization is reported.
Collapse
Affiliation(s)
- Mehdi Khosravi
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan
- Iran
| | - Hadi Feizi
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan
- Iran
| | - Behzad Haghighi
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan
- Iran
- Department of Chemistry
| | - Mohammad Mahdi Najafpour
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan
- Iran
- Center of Climate Change and Global Warming
| |
Collapse
|
112
|
Kolesnik IV, Kozlov DA, Poluboyarinov AS, Garshev AV, Ivanov VK. Non-classical growth of brookite nanorods. CrystEngComm 2019. [DOI: 10.1039/c9ce00682f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Under hydrothermal conditions, the formation of the brookite phase occurs due to the oriented attachment of anatase particles with subsequent recrystallization.
Collapse
Affiliation(s)
- Irina V. Kolesnik
- Lomonosov Moscow State University
- Moscow
- Russia
- Kurnakov Institute of General and Inorganic Chemistry of RAS
- Moscow
| | - Daniil A. Kozlov
- Lomonosov Moscow State University
- Moscow
- Russia
- Kurnakov Institute of General and Inorganic Chemistry of RAS
- Moscow
| | | | - Alexey V. Garshev
- Lomonosov Moscow State University
- Moscow
- Russia
- Baikov Institute of Metallurgy and Material Science RAS
- Moscow
| | - Vladimir K. Ivanov
- Lomonosov Moscow State University
- Moscow
- Russia
- Kurnakov Institute of General and Inorganic Chemistry of RAS
- Moscow
| |
Collapse
|
113
|
Mounasamy V, Mani GK, Ponnusamy D, Tsuchiya K, Prasad AK, Madanagurusamy S. Network mixed metal oxide (V4+ and Ti4+) nanostructures as potential material for the detection of trimethylamine. NEW J CHEM 2019. [DOI: 10.1039/c9nj00727j] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Room temperature trimethylamine sensing studies of mixed oxide VO2–TiO2 thin films deposited using the reactive dc magnetron co-sputtering technique.
Collapse
Affiliation(s)
- Veena Mounasamy
- Functional Nanomaterials & Devices Lab, Centre for Nanotechnology & Advanced Biomaterials and School of Electrical & Electronics Engineering, SASTRA Deemed to be University
- Thanjavur – 613 401
- India
| | | | - Dhivya Ponnusamy
- Micro/Nano Technology Centre (MNTC), Tokai University
- Hiratsuka
- Japan
| | - Kazuyoshi Tsuchiya
- Micro/Nano Technology Centre (MNTC), Tokai University
- Hiratsuka
- Japan
- Department of Precision Engineering, Tokai University
- Hiratsuka
| | - Arun K. Prasad
- Nanomaterials Characterization and Sensors Section, Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute
- Kalpakkam 603102
- India
| | - Sridharan Madanagurusamy
- Functional Nanomaterials & Devices Lab, Centre for Nanotechnology & Advanced Biomaterials and School of Electrical & Electronics Engineering, SASTRA Deemed to be University
- Thanjavur – 613 401
- India
| |
Collapse
|
114
|
Selective Catalytic Reduction of NOx with Ammonia and Hydrocarbon Oxidation Over V2O5–MoO3/TiO2 and V2O5–WO3/TiO2 SCR Catalysts. Top Catal 2018. [DOI: 10.1007/s11244-018-1097-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
115
|
Darvin ME, Schleusener J, Parenz F, Seidel O, Krafft C, Popp J, Lademann J. Confocal Raman microscopy combined with optical clearing for identification of inks in multicolored tattooed skin in vivo. Analyst 2018; 143:4990-4999. [PMID: 30225475 DOI: 10.1039/c8an01213j] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Raman measurements applied on freshly tattooed porcine skin ex vivo showed a possibility of obtaining the ink pigment related information in the skin. Based on these results, confocal Raman microscopy was used to identify the tattoo ink pigments of different colors in multicolored tattooed human skin in vivo. The Raman signatures of tattoo ink pigments were unique. Therefore, it could be shown that the applied method is successful for the identification of the tattoo ink pigments in human skin in vivo down to depths of approx. 50 μm, which is sufficient to screen the entire epidermis and the top of the papillary dermis area on the forearm and leg skin sites. Additional application of the optical clearing technique in vivo by topical application of glycerol, combined with tape stripping removal of the uppermost stratum corneum layers and defatting allows the extension of depths of investigation in tattooed skin down to approx. 400 μm, i.e. to cover the entire papillary dermis and a large part of the reticular dermis. Thus, the tattoo ink pigments were identified in vivo and depth-dependently in human tattooed skin confirming their presence in the papillary and reticular dermis. The proposed non-invasive in vivo Raman screening combined with optical clearing for identifying the tattoo pigments in the dermis can be an important task preceding a laser-based tattoo removal procedure and for determining the optimal laser parameters.
Collapse
Affiliation(s)
- Maxim E Darvin
- Charité- Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Dermatology, Venerology and Allergology, Center of Experimental and Applied Cutaneous Physiology, Charitéplatz 1, 10117 Berlin, Germany.
| | | | | | | | | | | | | |
Collapse
|
116
|
Singh A, Kalra V. TiO Phase Stabilized into Freestanding Nanofibers as Strong Polysulfide Immobilizer in Li-S Batteries: Evidence for Lewis Acid-Base Interactions. ACS APPLIED MATERIALS & INTERFACES 2018; 10:37937-37947. [PMID: 30360079 DOI: 10.1021/acsami.8b11029] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report the stabilization of titanium monoxide (TiO) nanoparticles in nanofibers through electrospinning and carbothermal processes and their unique bifunctionality-high conductivity and ability to bind polysulfides-in Li-S batteries. The developed three-dimensional TiO/carbon nanofiber (CNF) architecture with the inherent interfiber macropores of nanofiber mats provides a much higher surface area (∼427 m2 g-1) and overcomes the challenges associated with the use of highly dense powdered Ti-based suboxides/monoxide materials, thereby allowing for high active sulfur loading among other benefits. The developed TiO/CNF-S cathodes exhibit high initial discharge capacities of ∼1080, ∼975, and ∼791 mAh g-1 at 0.1, 0.2, and 0.5 C rates, respectively, with long-term cycling. Furthermore, freestanding TiO/CNF-S cathodes developed with rapid sulfur melt infiltration (∼5 s) eradicate the need of inactive elements, viz., binders, additional current collectors (Al-foil), and additives. Using postmortem X-ray photoelectron spectroscopy and Raman analysis, this study is the first to reveal the presence of strong Lewis acid-base interaction between TiO (3d2) and S x2- through the coordinate covalent Ti-S bond formation. Our results highlight the importance of developing Ti-suboxides/monoxide-based nanofibrous conducting polar host materials for next-generation Li-S batteries.
Collapse
Affiliation(s)
- Arvinder Singh
- Chemical and Biological Engineering , Drexel University , Philadelphia , Pennsylvania 19104 , United States
| | - Vibha Kalra
- Chemical and Biological Engineering , Drexel University , Philadelphia , Pennsylvania 19104 , United States
| |
Collapse
|
117
|
Barbosa JS, Neto DMA, Freire RM, Rocha JS, Fechine LMUD, Denardin JC, Valentini A, de Araújo TG, Mazzetto SE, Fechine PBA. Ultrafast sonochemistry-based approach to coat TiO 2 commercial particles for sunscreen formulation. ULTRASONICS SONOCHEMISTRY 2018; 48:340-348. [PMID: 30080559 DOI: 10.1016/j.ultsonch.2018.06.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Revised: 06/15/2018] [Accepted: 06/18/2018] [Indexed: 06/08/2023]
Abstract
TiO2 is a common inorganic filter used in sunscreens due to its photoprotective effect on the skin against UV radiation. However, the use of this kind of material in cosmetics is limited by its inherent photocatalytic activity. It is known that coating on TiO2 surface can improve some features. Although, many of the methodologies used for this purpose are still laborious and time-consuming. Thus, this work reports a novel, easy, cheap and fast strategy to coat TiO2 particles by using a sonochemistry approach, aiming to decrease photocatalytic activity and to enhance colloidal stability. For this proposal, SiO2, Al2O3, ZrO2 and sodium polyacrylate (PAANa) were used to tune the surface of commercial TiO2 particles and they were applied in a sunscreen formulation. The samples were characterized by XRPD, FT-IR, DLS, EDS, SEM and TEM. The photocatalytic activity and UV-shielding ability were also evaluated. The sunscreen formulations were prepared and characterized by zeta potential, DLS, and Sun Protection Factor (SPF). FT-IR, EDS, and charge surface of the particles confirmed the success of the sonochemistry coating. Additionally, TiO2@Al2O3, TiO2@SiO2 and TiO2@PAANa show a lower photocatalytic activity than original TiO2 with similar UV-shielding ability. The sunscreens produced with the coated TiO2 have similar SPF to the one with commercial TiO2. Specifically, the sunscreen with TiO2@PAANa shows an increase in colloidal stability. Herein, the incorporation of the sonochemical-coated TiO2 particles in sunscreen formulations may produce sunscreens with better aesthetic appearance and a greater health security due to its lower free radicals production.
Collapse
Affiliation(s)
- J S Barbosa
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil
| | - D M A Neto
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil; Natural Science and Mathematics Institute, University for International Integration of the Afro-Brazilian Lusophony - UNILAB, Campus dos Palmares, Redenção, CE, Brazil
| | - R M Freire
- Department of Physics, Universidad de Santiago de Chile and CEDENNA, USACH, Av. Ecuador, 3493 Santiago, Chile.
| | - J S Rocha
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil.
| | - L M U D Fechine
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil
| | - J C Denardin
- Department of Physics, Universidad de Santiago de Chile and CEDENNA, USACH, Av. Ecuador, 3493 Santiago, Chile; Departament of Physics, Federal University of Santa Maria, 97105-900 Santa Maria, RS, Brazil.
| | - A Valentini
- Laboratory of Adsorption and Catalysis (Langmuir) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil.
| | - T G de Araújo
- Laboratory of Cosmetology, Department of Pharmacy, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará, Fortaleza, CE, Brazil
| | - S E Mazzetto
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil.
| | - P B A Fechine
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil.
| |
Collapse
|
118
|
Gao M, Bao Y, Qian Y, Deng Y, Li Y, Chen G. Porous Anatase-TiO 2(B) Dual-Phase Nanorods Prepared from in Situ Pyrolysis of a Single Molecule Precursor Offer High Performance Lithium-Ion Storage. Inorg Chem 2018; 57:12245-12254. [PMID: 30211546 DOI: 10.1021/acs.inorgchem.8b01948] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
To overcome the problems faced by TiO2 materials for lithium-ion batteries usage, such as easy nanoparticles agglomeration during cycling and poor cycling performance, in this study, TiO2 nanorods with the controlled phase compositions are prepared via direct pyrolysis of single molecule precursors in combination with a simple washing process. By tuning the external cations in the single source precursors, three TiO2 samples in a nanorod shape with the compositions of pure anatase, anatase-rutile dual phase, and anatase-TiO2(B) dual phase are synthesized successfully. High-resolution transmission electron microscopy, X-ray powder diffraction, and Raman measurements confirm the phase structures and compositions of the three prepared samples. The electrochemical results manifest that all the three nanorod-shaped TiO2 samples show the long-term cycling stability as negative materials for LIBs. Among them, the TiO2 sample with the combination of the anatase and TiO2-B phase shows the best performance, with the specific capacity of ∼184, 164, 140, 105, 80, and 60 mAh g-1 at 0.1, 0.3, 0.5, 1.5, 3.0, and 5.0 A g-1, respectively, and showing no capacity loss and low resistance after 1000 cycles at 1.5 A g-1. By the analysis of the cyclic voltammetry results recorded from different scan rates, the lithium-ion storage mechanism is clarified, which is dominated by the semi-infinite linear diffusion (anatase phase) in combination with the partial surface pseudocapacitive contribution [TiO2(B) phase]. As a result, this sample shows a great potential as a negative material for LIBs because of its electrochemical stability, high specific capacity, and superior rate capability. The proof-of-concept design of the anatase and TiO2-B dual phase may provide a new strategy for the synthesis of high performance TiO2-based anode material for LIBs.
Collapse
Affiliation(s)
- Man Gao
- The Key Laboratory of Fuel Cell for Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou , 510640 , China
| | - Yubo Bao
- The Key Laboratory of Fuel Cell for Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou , 510640 , China
| | - Yunxian Qian
- The Key Laboratory of Fuel Cell for Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou , 510640 , China
| | - Yuanfu Deng
- The Key Laboratory of Fuel Cell for Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou , 510640 , China.,Electrochemical Energy Engineering Research Center of Guangdong Province , Guangzhou , 510640 , China
| | - Yingwei Li
- The Key Laboratory of Fuel Cell for Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou , 510640 , China
| | - Guohua Chen
- Department of Mechanical Engineering , The Hong Kong Polytechnic University , Hung Hom , Kowloon , Hong Kong , China
| |
Collapse
|
119
|
An HR, Hong YC, Kim H, Huh JY, Park EC, Park SY, Jeong Y, Park JI, Kim JP, Lee YC, Hong WK, Oh YK, Kim YJ, Yang M, Lee HU. Studies on mass production and highly solar light photocatalytic properties of gray hydrogenated-TiO 2 sphere photocatalysts. JOURNAL OF HAZARDOUS MATERIALS 2018; 358:222-233. [PMID: 29990810 DOI: 10.1016/j.jhazmat.2018.06.055] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 06/21/2018] [Accepted: 06/24/2018] [Indexed: 06/08/2023]
Abstract
In this paper, it is first reported that gray hydrogenated TiO2 sphere photocatalysts (H-TiO2) with high reactivity to solar light are mass produced within a few minutes using an underwater discharge plasma modified sol-gel method at room temperature and atmospheric pressure. This plasma modified system is an easy one-step in-situ synthetic process and the crystallinity, hydrogenation, and spherical structure of H-TiO2 are achieved by the synergy effect between the continuous reaction of highly energetic atomic and molecular species generated from the underwater plasma and surface tension of water. The resultant H-TiO2 demonstrated high anatase/rutile bicrystallinity and extended optical absorption spectrum from the ultraviolet (UV) to visible range. Furthermore, various defects including oxygen vacancies and hydroxyl species on the TiO2 surface permitted the enhancement of the photocatalytic performance. It was demonstrated that H-TiO2 photocatalysts showed significant degradation efficiencies for reactive black 5 (RB 5), rhodamine B (Rho B), and phenol (Ph) under solar light irradiation, up to approximately 5 times higher than that of commercial anatase TiO2 (C-TiO2), which resulted in good water purification. Notably, it was also possible to cultivate HepG2 cells using such well-purified water (to degrees up to 76%), with minimal cytotoxicity. Considering all these results, we believe that this novel plasma technology is promising for important environmental applications.
Collapse
Affiliation(s)
- Ha-Rim An
- Advanced Nano-surface Research Group, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - Yong Cheol Hong
- Plasma Technology Research Center, National Fusion Research Institute, Gunsan 54004, Republic of Korea; NPAC, Daejeon 305-806, Republic of Korea.
| | - Hyeran Kim
- Advanced Nano-surface Research Group, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - Jin Young Huh
- Plasma Technology Research Center, National Fusion Research Institute, Gunsan 54004, Republic of Korea; Department of Electrical and Biological Physics, Kwangwoon University, 447-1 Wolgye-dong, Nowon-gu, Seoul 01897, Republic of Korea
| | - Edmond Changkyun Park
- Division of Bio-Analytical Science, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - So Young Park
- Advanced Nano-surface Research Group, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - Yesul Jeong
- High Technology Components & Materials Research Center, Korea Basic Science Institute, Busan 46742, Republic of Korea
| | - Ji-In Park
- High Technology Components & Materials Research Center, Korea Basic Science Institute, Busan 46742, Republic of Korea
| | - Jong-Pil Kim
- High Technology Components & Materials Research Center, Korea Basic Science Institute, Busan 46742, Republic of Korea
| | - Young-Chul Lee
- Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 13120, Republic of Korea
| | - Woong-Ki Hong
- Jeonju Center, Korea Basic Science Institute, Jeonju, Jeollabuk-do, 54907, Republic of Korea
| | - You-Kwan Oh
- School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Youn Jung Kim
- Center for Research Facilities, Andong National University, Andong 36729, Republic of Korea
| | - MinHo Yang
- Department of Energy Engineering, Dankook University, Cheonan 31116, Republic of Korea
| | - Hyun Uk Lee
- Advanced Nano-surface Research Group, Korea Basic Science Institute, Daejeon 34133, Republic of Korea.
| |
Collapse
|
120
|
Zhou R, Han Y, Cao J, Li M, Jin G, Du Y, Luo H, Yang Y, Zhang L, Su B. Enhanced Osseointegration of Hierarchically Structured Ti Implant with Electrically Bioactive SnO 2-TiO 2 Bilayered Surface. ACS APPLIED MATERIALS & INTERFACES 2018; 10:30191-30200. [PMID: 30130089 DOI: 10.1021/acsami.8b10928] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The poor osseointegration of Ti implant significantly compromise its application in load-bearing bone repair and replacement. Electrically bioactive coating inspirited from heterojunction on Ti implant can benefit osseointegration but cannot avoid the stress shielding effect between bone and implant. To resolve this conflict, hierarchically structured Ti implant with electrically bioactive SnO2-TiO2 bilayered surface has been developed to enhance osseointegration. Benefiting from the electric cue offered by the built-in electrical field of SnO2-TiO2 heterojunction and the topographic cue provided by the hierarchical surface structure to bone regeneration, the osteoblastic function of basic multicellular units around the implant is significantly improved. Because the individual TiO2 or SnO2 coating with uniform surface exhibits no electrical bioactivity, the effects of electric and topographic cues to osseointegration have been decoupled via the analysis of in vivo performance for the placed Ti implant with different surfaces. The developed Ti implant shows significantly improved osseointegration with excellent bone-implant contact, improved mineralization of extracellular matrix, and increased push-out force. These results suggest that the synergistic strategy of combing electrical bioactivity with hierarchical surface structure provides a new platform for developing advanced endosseous implants.
Collapse
Affiliation(s)
- Rui Zhou
- Bristol Dental School , University of Bristol , Bristol BS1 2LY , U.K
| | | | - Jianyun Cao
- School of Materials , University of Manchester , Manchester M13 9PL , U.K
| | - Ming Li
- Honghui Hospital , Xi'an Jiaotong University College of Medicine , Xi'an 710054 , P. R. China
| | | | - Yuzhou Du
- School of Materials Science and Engineering , Xi'an University of Technology , Xi'an 710048 , P. R. China
| | | | | | | | - Bo Su
- Bristol Dental School , University of Bristol , Bristol BS1 2LY , U.K
| |
Collapse
|
121
|
Pagare PK, Kanade KG, Torane AP. Photoelectrochemical study of electrodeposited TiO2 thin films onto F:SnO2 substrates. RESEARCH ON CHEMICAL INTERMEDIATES 2018. [DOI: 10.1007/s11164-018-3556-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
|
122
|
Girardi L, Shuang S, Rizzi GA, Sartorel A, Marega C, Zhang Z, Granozzi G. Visible Light Driven Photoanodes for Water Oxidation Based on Novel r-GO/β-Cu₂V₂O₇/TiO₂ Nanorods Composites. NANOMATERIALS 2018; 8:nano8070544. [PMID: 30022003 PMCID: PMC6070958 DOI: 10.3390/nano8070544] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 07/04/2018] [Accepted: 07/16/2018] [Indexed: 11/18/2022]
Abstract
This paper describes the preparation and the photoelectrochemical performances of visible light driven photoanodes based on novel r-GO/β-Cu2V2O7/TiO2 nanorods/composites. β-Cu2V2O7 was deposited on both fluorine doped tin oxide (FTO) and TiO2 nanorods (NRs)/FTO by a fast and convenient Aerosol Assisted Spray Pyrolysis (AASP) procedure. Ethylenediamine (EN), ammonia and citric acid (CA) were tested as ligands for Cu2+ ions in the aerosol precursors solution. The best-performing deposits, in terms of photocurrent density, were obtained when NH3 was used as ligand. When β-Cu2V2O7 was deposited on the TiO2 NRs a good improvement in the durability of the photoanode was obtained, compared with pure β-Cu2V2O7 on FTO. A further remarkable improvement in durability and photocurrent density was obtained upon addition, by electrophoretic deposition, of reduced graphene oxide (r-GO) flakes on the β-Cu2V2O7/TiO2 composite material. The samples were characterized by X-ray Photoelectron Spectroscopy (XPS), Raman, High Resolution Transmission Electron Microscopy (HR-TEM), Scanning Electron Microscopy (SEM), Wide Angle X-ray Diffraction (WAXD) and UV–Vis spectroscopies. The photoelectrochemical (PEC) performances of β-Cu2V2O7 on FTO, β-Cu2V2O7/TiO2 and r-GO/β-Cu2V2O7/TiO2 were tested in visible light by linear voltammetry and Electrochemical Impedance Spectroscopy (EIS) measurements.
Collapse
Affiliation(s)
- Leonardo Girardi
- University of Padova and INSTM Unit, via Marzolo 1, 35121 Padova, Italy.
| | - Shuang Shuang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
| | - Gian Andrea Rizzi
- University of Padova and INSTM Unit, via Marzolo 1, 35121 Padova, Italy.
| | - Andrea Sartorel
- University of Padova and INSTM Unit, via Marzolo 1, 35121 Padova, Italy.
| | - Carla Marega
- University of Padova and INSTM Unit, via Marzolo 1, 35121 Padova, Italy.
| | - Zhengjun Zhang
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
| | - Gaetano Granozzi
- University of Padova and INSTM Unit, via Marzolo 1, 35121 Padova, Italy.
| |
Collapse
|
123
|
Combined Galvanostatic and Potentiostatic Plasma Electrolytic Oxidation of Titanium in Different Concentrations of H2SO4. METALS 2018. [DOI: 10.3390/met8060386] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
124
|
Sun X, Chang Y, Cheng Y, Feng Y, Zhang H. Band Alignment-Driven Oxidative Injury to the Skin by Anatase/Rutile Mixed-Phase Titanium Dioxide Nanoparticles Under Sunlight Exposure. Toxicol Sci 2018; 164:300-312. [DOI: 10.1093/toxsci/kfy088] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Affiliation(s)
- Xiujuan Sun
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
| | - Yun Chang
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Yan Cheng
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
| | - Yanlin Feng
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Haiyuan Zhang
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
- University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| |
Collapse
|
125
|
Craciun E, Predoana L, Atkinson I, Jitaru I, Anghel EM, Bratan V, Gifu C, Anastasescu C, Rusu A, Raditoiu V, Vasile E, Anastasescu M, Balint I, Zaharescu M. Fe3+-doped TiO2 nanopowders for photocatalytic mineralization of oxalic acid under solar light irradiation. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.12.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
126
|
The Role of Fe2O3 Species in Depressing the Formation of N2O in the Selective Reduction of NO by NH3 over V2O5/TiO2-Based Catalysts. Catalysts 2018. [DOI: 10.3390/catal8040134] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Promotion of 2.73% Fe2O3 in an in-house-made V2O5-WO3/TiO2 (VWT) and a commercial V2O5-WO3/TiO2 (c-VWT) has been investigated as a cost effective approach to the suppression of N2O formation in the selective catalytic reduction of NO by NH3 (NH3-SCR). The promoted VWT and c-VWT catalysts all gave a significantly decreased N2O production at temperatures >400 °C compared to the unpromoted samples. However, such a promotion led to the loss in high temperature NO conversion, mainly due to the oxidation of NH3 to N-containing gases, particularly NO. Characterization of the unpromoted and promoted catalysts using X-ray diffraction (XRD), NH3 adsorption-desorption, and Raman spectroscopy techniques could explain the reason why the promotion showed much lower N2O formation levels at high temperatures. The addition of Fe2O3 to c-VWT resulted in redispersion of the V2O5 species, although this was not visible for 2.73% Fe2O3/VWT. The iron oxides exist as a highly-dispersed noncrystalline α-Fe2O3 in the promoted catalysts. These Raman spectra had a new Raman signal that could be tentatively assigned to Fe2O3-induced tetrahedrally coordinated polymeric vanadates and/or surface V-O-Fe species with significant electronic interactions between the both metal oxides. Calculations of the monolayer coverage of each metal oxide and the surface total coverage are reasonably consistent with Raman measurements. The proposed vanadia-based surface polymeric entities may play a key role for the substantial reduction of N2O formed at high temperatures by NH3 species adsorbed strongly on the promoted catalysts. This reaction is a main pathway to greatly suppress the extent of N2O formation in NH3-SCR reaction over the promoted catalysts.
Collapse
|
127
|
Sandomierski M, Buchwald T, Strzemiecka B, Voelkel A. Modification of Ti6Al4V surface by diazonium compounds. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 191:27-35. [PMID: 28982066 DOI: 10.1016/j.saa.2017.09.070] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 09/22/2017] [Accepted: 09/26/2017] [Indexed: 06/07/2023]
Abstract
Ti6Al4V alloy is the most commonly used in orthopedic industry as an endoprosthesis. Ti6Al4V exhibits good mechanical properties, except the abrasion resistance. Surface modification of Ti6Al4V in order to obtain organic layer, and then the attachment of the polymer, can allow for overcoming this problem. The aim of the work was the modification of Ti6Al4V surface by diazonium compounds: salt or cation generated in situ and examine the influence of the reducing agent - ascorbic acid, and the temperature of reaction on modification process. Moreover, the simulated body fluid was used for the assessment of the organic layer stability on Ti6Al4V surface. The evaluation of the modification was carried out using the following methods: Raman microspectroscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Higher temperature of modification by 4-hydroxymethylbenzenediazonium cation, provides the largest amount of organic layer on the Ti6Al4V alloy. In the case of the Ti6Al4V modified by Variamine Blue B salt, the amount of organic layer is not dependent on the reaction condition. Moreover, the ascorbic acid and the presence of TiO2 does not effect on the modification. The modified surface is completely coated with the organic layer which is stable in simulated body fluid.
Collapse
Affiliation(s)
- Mariusz Sandomierski
- Institute of Chemical Technology and Engineering, Poznań University of Technology, Berdychowo 4, 60-965 Poznań, Poland.
| | - Tomasz Buchwald
- Institute of Materials Research and Quantum Engineering, Poznań University of Technology, Piotrowo 3, 60-965 Poznań, Poland.
| | - Beata Strzemiecka
- Institute of Chemical Technology and Engineering, Poznań University of Technology, Berdychowo 4, 60-965 Poznań, Poland.
| | - Adam Voelkel
- Institute of Chemical Technology and Engineering, Poznań University of Technology, Berdychowo 4, 60-965 Poznań, Poland.
| |
Collapse
|
128
|
Erden F, Li H, Wang X, Wang F, He C. High-performance thermoelectric materials based on ternary TiO2/CNT/PANI composites. Phys Chem Chem Phys 2018; 20:9411-9418. [DOI: 10.1039/c7cp07896j] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High-performance thermoelectric materials with a thermoelectric power factor of 114.5 μW mK−2 were obtained by using the ternary composite of TiO2/CNT/PANI.
Collapse
Affiliation(s)
- Fuat Erden
- Department of Materials Science and Engineering
- National University of Singapore
- Singapore
- Polymeric Materials Department
- Institute of Materials Research and Engineering
| | - Hui Li
- Department of Materials Science and Engineering
- National University of Singapore
- Singapore
| | - Xizu Wang
- Polymeric Materials Department
- Institute of Materials Research and Engineering
- Agency for Science
- Technology and Research (A*STAR)
- Singapore
| | - FuKe Wang
- Polymeric Materials Department
- Institute of Materials Research and Engineering
- Agency for Science
- Technology and Research (A*STAR)
- Singapore
| | - Chaobin He
- Department of Materials Science and Engineering
- National University of Singapore
- Singapore
- Polymeric Materials Department
- Institute of Materials Research and Engineering
| |
Collapse
|
129
|
|
130
|
Milosevic I, Jayaprakash A, Greenwood B, van Driel B, Rtimi S, Bowen P. Synergistic Effect of Fluorinated and N Doped TiO₂ Nanoparticles Leading to Different Microstructure and Enhanced Photocatalytic Bacterial Inactivation. NANOMATERIALS 2017; 7:nano7110391. [PMID: 29140308 PMCID: PMC5707608 DOI: 10.3390/nano7110391] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 11/09/2017] [Accepted: 11/10/2017] [Indexed: 11/10/2022]
Abstract
This work focuses on the development of a facile and scalable wet milling method followed by heat treatment to prepare fluorinated and/or N-doped TiO2 nanopowders with improved photocatalytic properties under visible light. The structural and electronic properties of doped particles were investigated by various techniques. The successful doping of TiO2 was confirmed by X-ray photoelectron spectroscopy (XPS), and the atoms appeared to be mainly located in interstitial positions for N whereas the fluorination is located at the TiO2 surface. The formation of intragap states was found to be responsible for the band gap narrowing leading to the faster bacterial inactivation dynamics observed for the fluorinated and N doped TiO2 particles compared to N-doped TiO2. This was attributed to a synergistic effect. The results presented in this study confirmed the suitability of the preparation approach for the large-scale production of cost-efficient doped TiO2 for effective bacterial inactivation.
Collapse
Affiliation(s)
- Irena Milosevic
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
| | - Amarnath Jayaprakash
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
| | - Brigitte Greenwood
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
| | - Birgit van Driel
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
| | - Sami Rtimi
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
- Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-GPAO, Station 6, CH-1015 Lausanne, Switzerland.
| | - Paul Bowen
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
| |
Collapse
|
131
|
Calabrese G, Pettersen SV, Pfüller C, Ramsteiner M, Grepstad JK, Brandt O, Geelhaar L, Fernández-Garrido S. Effect of surface roughness, chemical composition, and native oxide crystallinity on the orientation of self-assembled GaN nanowires on Ti foils. NANOTECHNOLOGY 2017; 28:425602. [PMID: 28930094 DOI: 10.1088/1361-6528/aa84a1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report on plasma-assisted molecular beam epitaxial growth of almost randomly oriented, uniformly tilted, and vertically aligned self-assembled GaN nanowires (NWs), respectively, on different types of polycrystalline Ti foils. The NW orientation with respect to the substrate normal, which is affected by an in situ treatment of the foil surface before NW growth, depends on the crystallinity of the native oxide. Direct growth on the as-received foils results in the formation of ensembles of nearly randomly oriented NWs due to the strong roughening of the surface induced by chemical reactions between the impinging elements and Ti. Surface nitridation preceding the NW growth is found to reduce this roughening by transformation of the uppermost layers into TiN and TiO x N y species. These compounds are more stable against chemical reactions and facilitate the growth of uniformly oriented GaN NW ensembles on the surface of the individual grains of the polycrystalline Ti foils. If an amorphous oxide layer is present at the foil surface, vertically oriented NWs are obtained all across the substrate because this layer blocks the transfering of the epitaxial information from the underlying grains. The control of NW orientation and the understanding behind the achievement of vertically oriented NWs obtained in this study represent an important step towards the realization of GaN NW-based bendable devices on polycrystalline metal foils.
Collapse
Affiliation(s)
- G Calabrese
- Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Hausvogteiplatz 5-7, 10117 Berlin, Germany
| | | | | | | | | | | | | | | |
Collapse
|
132
|
Pal A, Dey TK, Debnath AK, Bhushan B, Sahu AK, Bindal RC, Kar S. Mixed-matrix membranes with enhanced antifouling activity: probing the surface-tailoring potential of Tiron and chromotropic acid for nano-TiO 2. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170368. [PMID: 28989744 PMCID: PMC5627084 DOI: 10.1098/rsos.170368] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 08/07/2017] [Indexed: 06/07/2023]
Abstract
Mixed-matrix membranes (MMMs) were developed by impregnating organofunctionalized nanoadditives within fouling-susceptible polysulfone matrix following the non-solvent induced phase separation (NIPS) method. The facile functionalization of nanoparticles of anatase TiO2 (nano-TiO2) by using two different organoligands, viz. Tiron and chromotropic acid, was carried out to obtain organofunctionalized nanoadditives, FT-nano-TiO2 and FC-nano-TiO2, respectively. The structural features of nanoadditives were evaluated by X-ray diffraction, X-ray photoelectron spectroscopy, Raman and Fourier transform infrared spectroscopy, which established that Tiron leads to the blending of chelating and bridging bidentate geometries for FT-nano-TiO2, whereas chromotropic acid produces bridging bidentate as well as monodentate geometries for FC-nano-TiO2. The surface chemistry of the studied membranes, polysulfone (Psf): FT-nano-TiO2 UF and Psf: FC-nano-TiO2 UF, was profoundly influenced by the benign distributions of the nanoadditives enriched with distinctly charged sites ([Formula: see text]), as evidenced by superior morphology, improved topography, enhanced surface hydrophilicity and altered electrokinetic features. The membranes exhibited enhanced solvent throughputs, viz. 3500-4000 and 3400-4300 LMD at 1 bar of transmembrane pressure, without significant compromise in their rejection attributes. The flux recovery ratios and fouling resistive behaviours of MMMs towards bovine serum albumin indicated that the nanoadditives could impart stable and appreciable antifouling activity, potentially aiding in a sustainable ultrafiltration performance.
Collapse
Affiliation(s)
- Avishek Pal
- Membrane Development Section, Chemical Engineering Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
- Homi Bhabha National Institute, Anushakti Nagar, Trombay, Mumbai 400094, India
| | - T. K. Dey
- Membrane Development Section, Chemical Engineering Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - A. K. Debnath
- Technical Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
- Homi Bhabha National Institute, Anushakti Nagar, Trombay, Mumbai 400094, India
| | - Bharat Bhushan
- Membrane Development Section, Chemical Engineering Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
- Homi Bhabha National Institute, Anushakti Nagar, Trombay, Mumbai 400094, India
| | - A. K. Sahu
- Glass and Advanced Materials Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - R. C. Bindal
- Membrane Development Section, Chemical Engineering Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
- Homi Bhabha National Institute, Anushakti Nagar, Trombay, Mumbai 400094, India
| | - Soumitra Kar
- Membrane Development Section, Chemical Engineering Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
- Homi Bhabha National Institute, Anushakti Nagar, Trombay, Mumbai 400094, India
| |
Collapse
|
133
|
Gao M, Zou K, Deng Y, Zhao Z, Li Y, Chen G. An Unprecedented Case: A Low Specific Surface Area Anatase/N-Doped Carbon Nanocomposite Derived from a New Single Source Precursor Affords Fast and Stable Lithium Storage. ACS APPLIED MATERIALS & INTERFACES 2017; 9:28527-28536. [PMID: 28795793 DOI: 10.1021/acsami.7b07869] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A nanocomposite of ultrafine anatase nanoparticles (<5 nm) embedded N-doped carbon (TiO2-NPs/NC) with a relatively low specific surface area was successfully synthesized by in situ pyrolysis of a new and cheap single source precursor of (H2en)3[Ti4(O2)4(Hcit)2(cit)2]·12H2O (en = ethylenediamine and H4cit = citric acid) under 550 °C and an inert atmosphere. The precursor in crystalline state was isolated from an aqueous solution containing of titanium butoxide, citric acid, hydrogen peroxide, and ethylenediamine and was characterized. The crystal structure was determined by X-ray single crystal diffraction. To our surprise, the low surface area TiO2-NPs/NC exhibits a high specific capacity, superior rate capability, excellent cycle performance, and good processability as a negative material for rechargeable lithium-ion batteries (LIBs). A large reversible capacity of 360 and 125 mA h g-1 and a high Coulombic efficiency (the average value is ∼99.8%) could be kept even after 1000 cycles under a current density of 0.3 and 6 A g-1, respectively. An analysis of the voltammetric sweep data shows that the pseudocapacitive behavior occurred at the surface of the material and the lithium intercalation processes contribute to the total stored charge, resulting in the high capacity of the TiO2-NPs/NC nanocomposite. The potentiostatic intermittent titration technique used to determine the lithium ion diffusion (DLi+) suggested the TiO2-NPs/NC nanocomposite displays a high DLi+. In addition, the high electric conductivity provided by the NC substrate and the ultrafine anatase particles can mitigate the diffusion path for electrons and ions and tolerate higher strain, and thus effectively decrease pulverization and improve the rate and cycle performance. In particular, the observed superior lithium storage properties, resulting from the low surface area nanocomposite with ultrafine nanoparticles embedded NC substrate, are expected to have fundamental and practical implications for the preparation of high performance electrodes in LIBs or other cells.
Collapse
Affiliation(s)
- Man Gao
- The Key Laboratory of Fuel Cell for Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou, 510640, China
| | - Kaixiang Zou
- The Key Laboratory of Fuel Cell for Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou, 510640, China
| | - Yuanfu Deng
- The Key Laboratory of Fuel Cell for Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou, 510640, China
| | - Zhenxia Zhao
- Guangxi Colleges and Universities Key Laboratory of New Technology and Application in Resource Chemical Engineering, Guangxi University , Nanning 530004, China
| | - Yingwei Li
- The Key Laboratory of Fuel Cell for Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou, 510640, China
| | - Guohua Chen
- Department of Mechanical Engineering, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong, China
| |
Collapse
|
134
|
Sekizaki S, Osada M, Nagashio K. Molecularly-thin anatase field-effect transistors fabricated through the solid state transformation of titania nanosheets. NANOSCALE 2017; 9:6471-6477. [PMID: 28466951 DOI: 10.1039/c7nr01305a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We demonstrate the field-effect transistor (FET) operation of a molecularly-thin anatase phase produced through solid state transformation from Ti0.87O2 nanosheets. A monolayer Ti0.87O2 nanosheet with a thickness of 0.7 nm is a two-dimensional oxide insulator in which Ti vacancies are incorporated, rather than oxygen vacancies. Since the fabrication method, in general, largely affects the film quality, the anatase films derived from the Ti0.87O2 nanosheets show interesting characteristics, such as no photocurrent peak at ∼2 eV, which is related to oxygen vacancies, and a larger band gap of 3.8 eV. The 10 nm thick anatase FETs exhibit superior transport characteristics with a maximum mobility of ∼1.3 cm2 V-1 s-1 and a current on/off ratio of ∼105 at room temperature. The molecularly-thin anatase FET may provide new functionalities, such as field-effect control of catalytic properties.
Collapse
Affiliation(s)
- S Sekizaki
- Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
| | | | | |
Collapse
|
135
|
Ziarati A, Badiei A, Mohammadi Ziarani G, Eskandarloo H. Simultaneous photocatalytic and catalytic activity of p–n junction NiO@anatase/rutile-TiO2 as a noble-metal free reusable nanoparticle for synthesis of organic compounds. CATAL COMMUN 2017. [DOI: 10.1016/j.catcom.2017.02.023] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
136
|
Krysova H, Mazzolini P, Casari CS, Russo V, Bassi AL, Kavan L. Electrochemical Properties of Transparent Conducting Films of Tantalum-Doped Titanium Dioxide. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.02.124] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
137
|
Dimuccio LA, Rodrigues N, Larocca F, Pratas J, Amado AM, de Carvalho LAEB. Geochemical and mineralogical fingerprints to distinguish the exploited ferruginous mineralisations of Grotta della Monaca (Calabria, Italy). SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 173:704-720. [PMID: 27783985 DOI: 10.1016/j.saa.2016.10.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 09/22/2016] [Accepted: 10/16/2016] [Indexed: 06/06/2023]
Abstract
This study examines the geochemical and mineralogical variations in the ferruginous mineralisations that crop out within Grotta della Monaca, which is considered to be the most striking and best known example of a prehistoric iron mine-cave from the southern Apennines (Calabria, Italy). Previous archaeological research identified three local and distinct ancient exploitation phases of these ferruginous mineralisations: (1) an Upper Palaeolithic phase; (2) a Late Neolithic phase; and (3) a post-Medieval phase. These materials, which have various forms of complex mineralogical admixtures and range in colour from yellow-orange to red and darker brown shades, mainly consist of iron oxides/hydroxides (essentially goethite and lepidocrocite), which are often mixed with subordinate and variable amounts of other matrix components (carbonates, sulphates, arsenates, silicates and organic matter). Such ferruginous mineralisations generally correspond to geochemically heterogeneous massive dyke/vein/mammillary/stratiform facies that are exposed within the local caves along open fractures and inclined bedding planes and that partially cover cave wall niches/notches/pockets and ceiling cupolas/holes. Selected samples/sub-samples are analysed through a multi-technique approach with a handheld portable X-ray Fluorescence, X-ray Diffraction, micro-Raman and Fourier Transform Infrared spectroscope (both conventional and attenuated total reflection), which is combined with subsequent multivariate statistical analysis of the elemental concentration data. The geochemical and mineralogical results are used to individualise similar compositional clusters. As expected, the identified groups, each of which has very specific geochemical-mineralogical "fingerprints" and spatial distributions, enable us to identify the sampled ferruginous mineralisations. These specific mineral resources can be compared to similar raw materials that are found in other neighbouring archaeological sites, with obvious implications toward understanding local exploitation strategies through time and the exchanges and kinship networks of these materials.
Collapse
Affiliation(s)
- Luca Antonio Dimuccio
- Centre of Studies on Geography and Spatial Planning (CEGOT), Colégio de S. Jerónimo, University of Coimbra, 3004-530 Coimbra, Portugal; Centro Regionale di Speleologia "Enzo dei Medici", Via Lucania 3, 87070 Roseto Capo Spulico, CS, Italy.
| | - Nelson Rodrigues
- Department of Earth Sciences, Faculty of Sciences and Technology, University of Coimbra - Polo II, 3030-790 Coimbra, Portugal
| | - Felice Larocca
- Centro Regionale di Speleologia "Enzo dei Medici", Via Lucania 3, 87070 Roseto Capo Spulico, CS, Italy; Gruppo di Ricerca Speleo-Archeologica, University of Bari, Piazza Umberto, 70121 Bari, Italy
| | - João Pratas
- Department of Earth Sciences, Faculty of Sciences and Technology, University of Coimbra - Polo II, 3030-790 Coimbra, Portugal; Marine and Environmental Sciences Centre (MARE), Faculty of Sciences and Technology, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Ana Margarida Amado
- Unidade de I&D "Química-Física Molecular", Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Luís A E Batista de Carvalho
- Unidade de I&D "Química-Física Molecular", Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| |
Collapse
|
138
|
Krishnapriya R, Praneetha S, Vadivel Murugan A. Microwave-solvothermal synthesis of various TiO2 nano-morphologies with enhanced efficiency by incorporating Ni nanoparticles in an electrolyte for dye-sensitized solar cells. Inorg Chem Front 2017. [DOI: 10.1039/c7qi00329c] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel systematic approach is demonstrated to enhance the efficiency of dye-sensitized solar cells by impregnating Ni-nanoparticles into I−/I3− electrolyte with various TiO2 nanomorphologies-based photo-anodes synthesized via microwave-solvothermal process.
Collapse
Affiliation(s)
- R. Krishnapriya
- Advanced Functional Nanostructured Materials Laboratory
- Centre for Nanoscience and Technology
- Madanjeet School of Green Energy Technologies
- Pondicherry University (A Central University)
- Puducherry-605014
| | - S. Praneetha
- Advanced Functional Nanostructured Materials Laboratory
- Centre for Nanoscience and Technology
- Madanjeet School of Green Energy Technologies
- Pondicherry University (A Central University)
- Puducherry-605014
| | - A. Vadivel Murugan
- Advanced Functional Nanostructured Materials Laboratory
- Centre for Nanoscience and Technology
- Madanjeet School of Green Energy Technologies
- Pondicherry University (A Central University)
- Puducherry-605014
| |
Collapse
|
139
|
Peleyeju MG, Umukoro EH, Tshwenya L, Moutloali R, Babalola JO, Arotiba OA. Photoelectrocatalytic water treatment systems: degradation, kinetics and intermediate products studies of sulfamethoxazole on a TiO2–exfoliated graphite electrode. RSC Adv 2017. [DOI: 10.1039/c7ra07399b] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
EG–TiO2 photoanode was applied for the photoelectrocatalytic degradation of sulfamethoxazole. Significant COD abatement was obtained and degradation route was proposed.
Collapse
Affiliation(s)
- Moses G. Peleyeju
- Department of Applied Chemistry
- University of Johannesburg
- Doornfontein 2028
- South Africa
- DST/Mintek Nanotechnology Innovation Centre
| | - Eseoghene H. Umukoro
- Department of Applied Chemistry
- University of Johannesburg
- Doornfontein 2028
- South Africa
| | - Luthando Tshwenya
- Department of Applied Chemistry
- University of Johannesburg
- Doornfontein 2028
- South Africa
- DST/Mintek Nanotechnology Innovation Centre
| | - Richard Moutloali
- Department of Applied Chemistry
- University of Johannesburg
- Doornfontein 2028
- South Africa
- DST/Mintek Nanotechnology Innovation Centre
| | | | - Omotayo A. Arotiba
- Department of Applied Chemistry
- University of Johannesburg
- Doornfontein 2028
- South Africa
- DST/Mintek Nanotechnology Innovation Centre
| |
Collapse
|
140
|
Li A, Wang Z, Yin H, Wang S, Yan P, Huang B, Wang X, Li R, Zong X, Han H, Li C. Understanding the anatase-rutile phase junction in charge separation and transfer in a TiO 2 electrode for photoelectrochemical water splitting. Chem Sci 2016; 7:6076-6082. [PMID: 30034748 PMCID: PMC6022233 DOI: 10.1039/c6sc01611a] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 06/08/2016] [Indexed: 12/22/2022] Open
Abstract
New insight into junction-based designs for efficient charge separation is vitally important for current solar energy conversion research. Herein, an anatase-rutile phase junction is elaborately introduced into TiO2 films by rapid thermal annealing treatment and the roles of phase junction on charge separation and transfer are studied in detail. A combined study of transient absorption spectroscopy, electrochemical and photoelectrochemical (PEC) measurements reveals that appropriate phase alignment is essential for unidirectional charge transfer, and a junction interface with minimized trap states is crucial to liberate the charge separation potential of the phase junction. By tailored control of phase alignment and interface structure, an optimized TiO2 film with an appropriately introduced phase junction shows superior performance in charge separation and transfer, hence achieving ca. 3 and 9 times photocurrent density enhancement compared to pristine anatase and rutile phase TiO2 electrodes, respectively. This work demonstrates the great potential of phase junctions for efficient charge separation and transfer in solar energy conversion applications.
Collapse
Affiliation(s)
- Ailong Li
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian National Laboratory for Clean Energy , 457 Zhongshan Road , Dalian , 116023 , China . ;
- Graduate University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Zhiliang Wang
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian National Laboratory for Clean Energy , 457 Zhongshan Road , Dalian , 116023 , China . ;
- Graduate University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Heng Yin
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian National Laboratory for Clean Energy , 457 Zhongshan Road , Dalian , 116023 , China . ;
- Graduate University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Shengyang Wang
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian National Laboratory for Clean Energy , 457 Zhongshan Road , Dalian , 116023 , China . ;
- Graduate University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Pengli Yan
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian National Laboratory for Clean Energy , 457 Zhongshan Road , Dalian , 116023 , China . ;
- Graduate University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Baokun Huang
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian National Laboratory for Clean Energy , 457 Zhongshan Road , Dalian , 116023 , China . ;
| | - Xiuli Wang
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian National Laboratory for Clean Energy , 457 Zhongshan Road , Dalian , 116023 , China . ;
| | - Rengui Li
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian National Laboratory for Clean Energy , 457 Zhongshan Road , Dalian , 116023 , China . ;
| | - Xu Zong
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian National Laboratory for Clean Energy , 457 Zhongshan Road , Dalian , 116023 , China . ;
| | - Hongxian Han
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian National Laboratory for Clean Energy , 457 Zhongshan Road , Dalian , 116023 , China . ;
- Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) , China
| | - Can Li
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian National Laboratory for Clean Energy , 457 Zhongshan Road , Dalian , 116023 , China . ;
- Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) , China
| |
Collapse
|
141
|
Senna M, Fabián M, Kavan L, Zukalová M, Briančin J, Turianicová E, Bottke P, Wilkening M, Šepelák V. Electrochemical properties of spinel Li4Ti5O12 nanoparticles prepared via a low-temperature solid route. J Solid State Electrochem 2016. [DOI: 10.1007/s10008-016-3272-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
142
|
Popov VV, Menushenkov AP, Yastrebtsev AA, Korovin SA, Tumarkin AV, Pisarev AA, Tsarenko NA, Arzhatkina LA, Arzhatkina OA. The effect of synthesis conditions on the structure of compounds formed in the Dy2O3–TiO2 system. RUSS J INORG CHEM+ 2016. [DOI: 10.1134/s003602361604015x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
143
|
In situ Raman spectroelectrochemistry as a useful tool for detection of TiO2(anatase) impurities in TiO2(B) and TiO2(rutile). MONATSHEFTE FUR CHEMIE 2016. [DOI: 10.1007/s00706-016-1678-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
144
|
Narrowing of band gap and effective charge carrier separation in oxygen deficient TiO 2 nanotubes with improved visible light photocatalytic activity. J Colloid Interface Sci 2016; 465:1-10. [DOI: 10.1016/j.jcis.2015.11.050] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Revised: 11/19/2015] [Accepted: 11/20/2015] [Indexed: 11/22/2022]
|
145
|
Zhao J, Wang Y, Li Y, Yue X, Wang C. Phase-dependent enhancement for CO2 photocatalytic reduction over CeO2/TiO2 catalysts. Catal Sci Technol 2016. [DOI: 10.1039/c6cy01365a] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The addition of CeO2 can increase the activity of rutile for CO2 photoreduction under simulated sunlight irradiation because of the presence of Ti defects at the CeO2–rutile interfaces, and this is beneficial to the interfacial separation of photogenerated charge carriers.
Collapse
Affiliation(s)
- Jie Zhao
- Laboratory of Environmental Sciences and Technology
- Xinjiang Technical Institute of Physics and Chemistry
- Key Laboratory of Functional Materials and Devices for Special Environments
- Chinese Academy of Sciences
- Xinjiang 830011
| | - Yun Wang
- Laboratory of Environmental Sciences and Technology
- Xinjiang Technical Institute of Physics and Chemistry
- Key Laboratory of Functional Materials and Devices for Special Environments
- Chinese Academy of Sciences
- Xinjiang 830011
| | - Yingxuan Li
- Laboratory of Environmental Sciences and Technology
- Xinjiang Technical Institute of Physics and Chemistry
- Key Laboratory of Functional Materials and Devices for Special Environments
- Chinese Academy of Sciences
- Xinjiang 830011
| | - Xiu Yue
- Laboratory of Environmental Sciences and Technology
- Xinjiang Technical Institute of Physics and Chemistry
- Key Laboratory of Functional Materials and Devices for Special Environments
- Chinese Academy of Sciences
- Xinjiang 830011
| | - Chuanyi Wang
- Laboratory of Environmental Sciences and Technology
- Xinjiang Technical Institute of Physics and Chemistry
- Key Laboratory of Functional Materials and Devices for Special Environments
- Chinese Academy of Sciences
- Xinjiang 830011
| |
Collapse
|
146
|
Melchionna M, Beltram A, Montini T, Monai M, Nasi L, Fornasiero P, Prato M. Highly efficient hydrogen production through ethanol photoreforming by a carbon nanocone/Pd@TiO2 hybrid catalyst. Chem Commun (Camb) 2016; 52:764-7. [DOI: 10.1039/c5cc08015k] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Production of molecular hydrogen (H2) is becoming an increasingly prominent process, due to the high expectations as a new green energy carrier and key reagent for many industrial processes.
Collapse
Affiliation(s)
- M. Melchionna
- Department of Chemical and Pharmaceutical Sciences
- INSTM, ICCOM-CNR
- University of Trieste
- 34127 Trieste
- Italy
| | - A. Beltram
- Department of Chemical and Pharmaceutical Sciences
- INSTM, ICCOM-CNR
- University of Trieste
- 34127 Trieste
- Italy
| | - T. Montini
- Department of Chemical and Pharmaceutical Sciences
- INSTM, ICCOM-CNR
- University of Trieste
- 34127 Trieste
- Italy
| | - M. Monai
- Department of Chemical and Pharmaceutical Sciences
- INSTM, ICCOM-CNR
- University of Trieste
- 34127 Trieste
- Italy
| | - L. Nasi
- CNR-IMEM Institute
- 43124 Parma
- Italy
| | - P. Fornasiero
- Department of Chemical and Pharmaceutical Sciences
- INSTM, ICCOM-CNR
- University of Trieste
- 34127 Trieste
- Italy
| | - M. Prato
- Department of Chemical and Pharmaceutical Sciences
- INSTM, ICCOM-CNR
- University of Trieste
- 34127 Trieste
- Italy
| |
Collapse
|
147
|
Yuan B, Long Y, Wu L, Liang K, Wen H, Luo S, Huo H, Yang H, Ma J. TiO2@h-CeO2: a composite yolk–shell microsphere with enhanced photodegradation activity. Catal Sci Technol 2016. [DOI: 10.1039/c6cy00466k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A yolk–shell composite microsphere, TiO2@h-CeO2, has been designed, synthesized, characterized and applied in the photodegradation of methylene blue.
Collapse
Affiliation(s)
- Bing Yuan
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- PR China
| | - Yu Long
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- PR China
| | - Li Wu
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- PR China
| | - Kun Liang
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- PR China
| | - He Wen
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- PR China
| | - Sha Luo
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- PR China
| | - Hongfei Huo
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- PR China
| | - Honglei Yang
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- PR China
| | - Jiantai Ma
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- PR China
| |
Collapse
|
148
|
Shayganpour A, Rebaudi A, Cortella P, Diaspro A, Salerno M. Electrochemical coating of dental implants with anodic porous titania for enhanced osteointegration. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2015; 6:2183-2192. [PMID: 26665091 PMCID: PMC4660911 DOI: 10.3762/bjnano.6.224] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 11/11/2015] [Indexed: 06/05/2023]
Abstract
Clinical long-term osteointegration of titanium-based biomedical devices is the main goal for both dental and orthopedical implants. Both the surface morphology and the possible functionalization of the implant surface are important points. In the last decade, following the success of nanostructured anodic porous alumina, anodic porous titania has also attracted the interest of academic researchers. This material, investigated mainly for its photocatalytic properties and for applications in solar cells, is usually obtained from the anodization of ultrapure titanium. We anodized dental implants made of commercial grade titanium under different experimental conditions and characterized the resulting surface morphology with scanning electron microscopy equipped with an energy dispersive spectrometer. The appearance of nanopores on these implants confirm that anodic porous titania can be obtained not only on ultrapure and flat titanium but also as a conformal coating on curved surfaces of real objects made of industrial titanium alloys. Raman spectroscopy showed that the titania phase obtained is anatase. Furthermore, it was demonstrated that by carrying out the anodization in the presence of electrolyte additives such as magnesium, these can be incorporated into the porous coating. The proposed method for the surface nanostructuring of biomedical implants should allow for integration of conventional microscale treatments such as sandblasting with additive nanoscale patterning. Additional advantages are provided by this material when considering the possible loading of bioactive drugs in the porous cavities.
Collapse
Affiliation(s)
- Amirreza Shayganpour
- Nanophysics Department, Istituto Italiano di Tecnologia, via Morego 30, 16149 Genova, Italy
| | - Alberto Rebaudi
- Rebaudi Dental Office, piazza della Vittoria 8, 16121 Genova, Italy
| | | | - Alberto Diaspro
- Nanophysics Department, Istituto Italiano di Tecnologia, via Morego 30, 16149 Genova, Italy
| | - Marco Salerno
- Nanophysics Department, Istituto Italiano di Tecnologia, via Morego 30, 16149 Genova, Italy
| |
Collapse
|
149
|
Gnedenkov SV, Opra DP, Zheleznov VV, Sinebryukhov SL, Voit EI, Sokolov AA, Sushkov YV, Podgorbunskii AB, Sergienko VI. Nanostructured zirconia-doped titania as the anode material for lithium-ion battery. RUSS J INORG CHEM+ 2015. [DOI: 10.1134/s0036023615060054] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
150
|
Civiš S, Ferus M, Šponer JE, Šponer J, Kavan L, Zukalová M. Room temperature spontaneous conversion of OCS to CO2 on the anatase TiO2 surface. Chem Commun (Camb) 2015; 50:7712-5. [PMID: 24901888 DOI: 10.1039/c4cc01992j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High-resolution FT-IR spectroscopy combined with quantum chemical calculations was used to study the chemistry of OCS-disproportionation over the reduced surface of isotopically labelled, nanocrystalline TiO2. Analysis of the isotopic composition of the product gases has revealed that the reaction involves solely OCS molecules from the gas-phase. Using quantum chemical calculations we propose a plausible mechanistic scenario, in which two reduced Ti(3+) centres mediate the reaction of the adsorbed OCS molecules.
Collapse
Affiliation(s)
- Svatopluk Civiš
- J. Heyrovský Institute of Physical Chemistry, v. v. i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague 8, Czech Republic.
| | | | | | | | | | | |
Collapse
|