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Mantilla Á, Guerrero-Araque D, Sierra-Uribe JH, Lartundo-Rojas L, Gómez R, Calderon HA, Zanella R, Ramírez-Ortega D. Highly efficient mobility, separation and charge transfer in black SnO 2-TiO 2 structures with co-catalysts: the key step for the photocatalytic hydrogen evolution. RSC Adv 2024; 14:26259-26271. [PMID: 39161446 PMCID: PMC11332590 DOI: 10.1039/d4ra03731f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Accepted: 07/26/2024] [Indexed: 08/21/2024] Open
Abstract
Oxygen vacancies and co-catalysts enhance photocatalytic hydrogen production by improving the charge carrier separation. Herein, the black SnO2-TiO2 structure (BST) was synthesized for the first time by two consecutive methods. First, the sol-gel nucleation method allowed TiO2 to form on the SnO2 nanoparticles, creating a strong interaction and direct contact between them. Subsequently, this structure was reduced by NaBH4 during thermal treatment, generating (Ti3+/Sn2+) states to form the BST. Then, 2 wt% of Co, Cu or Pd was impregnated onto BST. The results showed that the activity raised with the presence of Ti3+/Sn2+ states, reaching a hydrogen generation rate of 147.50 μmol g-1 h-1 with BST in comparison with the rate of 99.50 μmol g-1 h-1 for white SnO2-TiO2. On the other hand, the interaction of the co-catalysts with the BST structure helped to increase the photocatalytic hydrogen production rates: 154.10 μmol g-1 h-1, 384.18 μmol g-1 h-1 and 480.20 μmol g-1 h-1 for cobalt-BST, copper-BST and palladium-BST, respectively. The results can be associated with the creation of Ti3+/Sn2+ at the BST interface that changes the lifetime of the charge carrier, improving the separation of photogenerated electrons and holes and the co-catalysts in the structures move the flat band position and increasing the photocurrent response to having electrons with greater reducing power.
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Affiliation(s)
- Ángeles Mantilla
- Instituto Politécnico Nacional, Laboratorio de Fotocatálisis, CICATA-Legaria Legaria 694, Col. Irrigación 11500 Mexico City Mexico
| | - Diana Guerrero-Araque
- CONAHCyT-Universidad Autónoma Metropolitana, Departamento de Química Av. San Rafael Atlixco 156 09340 Mexico City Mexico
| | - Jhon Harrison Sierra-Uribe
- Universidad Autónoma Metropolitana, Departamento de Química Av. San Rafael Atlixco 156 09340 Mexico City Mexico
| | - Luis Lartundo-Rojas
- Instituto Politécnico Nacional, Centro de Nanociencias y Micro y Nanotecnología, Zacatenco Mexico City Mexico
| | - Ricardo Gómez
- Universidad Autónoma Metropolitana, Departamento de Química Av. San Rafael Atlixco 156 09340 Mexico City Mexico
| | - Héctor A Calderon
- Instituto Politécnico Nacional, ESFM, Departamento de Física, UPALM Miguel Othon de Mendizabal s/n 07320 Mexico City Mexico
| | - Rodolfo Zanella
- Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Ciudad Universitaria Circuito Exterior S/N, Coyoacan 04510 Mexico City Mexico
| | - David Ramírez-Ortega
- Instituto Politécnico Nacional, Laboratorio de Fotocatálisis, CICATA-Legaria Legaria 694, Col. Irrigación 11500 Mexico City Mexico
- Instituto Politécnico Nacional-ENCB Edificio 8, Av. Luis Enrique Erro S/N, UPALM 07738 Mexico City Mexico
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Wu X, Wang H, Wang Y. A Review: Synthesis and Applications of Titanium Sub-Oxides. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6874. [PMID: 37959470 PMCID: PMC10650678 DOI: 10.3390/ma16216874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 10/16/2023] [Accepted: 10/20/2023] [Indexed: 11/15/2023]
Abstract
Magnéli phase titanium oxides, also called titanium sub-oxides (TinO2n-1, 4 < n < 9), are a series of electrically conducting ceramic materials. The synthesis and applications of these materials have recently attracted tremendous attention because of their applications in a number of existing and emerging areas. Titanium sub-oxides are generally synthesized through the reduction of titanium dioxide using hydrogen, carbon, metals or metal hydrides as reduction agents. More recently, the synthesis of nanostructured titanium sub-oxides has been making progress through optimizing thermal reduction processes or using new titanium-containing precursors. Titanium sub-oxides have attractive properties such as electrical conductivity, corrosion resistance and optical properties. Titanium sub-oxides have played important roles in a number of areas such as conducting materials, fuel cells and organic degradation. Titanium sub-oxides also show promising applications in batteries, solar energy, coatings and electronic and optoelectronic devices. Titanium sub-oxides are expected to become more important materials in the future. In this review, the recent progress in the synthesis methods and applications of titanium sub-oxides in the existing and emerging areas are reviewed.
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Affiliation(s)
- Xiaoping Wu
- State Key Laboratory of V and Ti Resources Comprehensive Utilization, Ansteel Research Institute of Vanadium & Titanium (Iron & Steele), Panzhihua 617000, China;
| | - Haibo Wang
- State Key Laboratory of V and Ti Resources Comprehensive Utilization, Ansteel Research Institute of Vanadium & Titanium (Iron & Steele), Panzhihua 617000, China;
| | - Yu Wang
- The School of Chemistry and Chemical Engineering, State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing 400044, China;
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3
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Kumar A, Barbhuiya NH, Nair AM, Jashrapuria K, Dixit N, Singh SP. In-situ fabrication of titanium suboxide-laser induced graphene composites: Removal of organic pollutants and MS2 Bacteriophage. CHEMOSPHERE 2023:138988. [PMID: 37247678 DOI: 10.1016/j.chemosphere.2023.138988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 02/28/2023] [Accepted: 05/17/2023] [Indexed: 05/31/2023]
Abstract
Titanium suboxides (TSO) are identified as a series of compounds showing excellent electro- and photochemical properties. TSO composites with carbon-based materials such as graphene have further improved water splitting and pollutant removal performance. However, their expensive and multi-step synthesis limits their wide-scale use. Furthermore, recently discovered laser-induced graphene (LIG) is a single-step and low-cost fabrication of graphene-based composites. Moreover, LIG's highly electrically conductive surface aids in tremendous environmental applications, including bacterial inactivation, anti-biofouling, and pollutant sensing. Here, we demonstrate the single-step in-situ fabrication of TSO-LIG composite by directly scribing the TiO2 mixed poly(ether) sulfone sheets using a CO2 infrared laser. In contrast, earlier composites were derived from either commercial-grade TSO or synthesized TSO with graphene. The characteristic Ti3+ peaks in XPS confirmed the conversion of TiO2 into its sub-stoichiometric form, enhancing the electro-catalytical properties of the LIG-TiOx composite surface. Electrochemical characterization, including impedance spectroscopy, validated the surface's enhanced electrochemical activity and electrode stability. Furthermore, the LIG-TiOx composite surfaces were tested for anti-biofouling action and electrochemical application as electrodes and filters. The composite electrodes exhibit enhanced degradation performance for removing emerging pollutant antibiotics ciprofloxacin and methylene blue due to the in-situ hydroxyl radical generation. Additionally, the LIG-TiOx conductive filters showed the complete 6-log killing of mixed bacterial culture and MS2 phage virus in flow-through filtration mode at 2.5 V, which is ∼2.5-log more killing compared to non-composited LIG filers at 500 Lm-2h-1. Nevertheless, these cost-effective LIG-TiOx composites have excellent electrical properties and can be effectively utilized for energy and environmental applications.
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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
| | - Akhila M Nair
- Centre for Research in Nanotechnology & Science (CRNTS), Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Kritika Jashrapuria
- Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Nandini Dixit
- 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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4
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Li Z, Li B, Li Q. Single-Atom Nano-Islands (SANIs): A Robust Atomic-Nano System for Versatile Heterogeneous Catalysis Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2211103. [PMID: 36967534 DOI: 10.1002/adma.202211103] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/17/2022] [Indexed: 05/19/2023]
Abstract
Academician Tao Zhang from China and co-workers designed the first Pt1 /FeOx single-atom catalysts (SACs) in 2011, and they proposed the concept of "single-atom catalysis" in the field of heterogeneous catalysis. Generally, it is easy for active metal single-atom sites on a carrier to migrate and aggregate, which results in poor performance; or the chemical bond between the metal atom and carrier is too strong (immovable), which results in passivation of the active site. Recently, "nano-island" type SACs were designed, in which the active metal atoms are isolated on the "islands", and can move within the respective "island", but the migration across the "island" is blocked, to achieve a dynamic confinement design of single atoms (that is, a "moving but not aggregating" design philosophy). Herein, a new concept of "single-atom nano-islands (SANIs)" is proposed to describe these congeneric "atomic-nano" systems in heterogeneous catalysis fields. Particularly, the SANIs are divided into three categories: "one-island-one-atom", "one-island-multi-atoms", and "island-sea synergism" architectures. The scientific significance and application principles of SANIs in versatile heterogeneous catalysis fields (i.e., thermocatalysis, electrocatalysis, and photocatalysis) are summarized. The challenges and proposals of SANIs are also provided.
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Affiliation(s)
- Zesheng Li
- College of Chemistry, Guangdong University of Petrochemical Technology, Maoming, 525000, China
| | - Bolin Li
- College of Chemistry, Guangdong University of Petrochemical Technology, Maoming, 525000, China
| | - Qingyu Li
- Guangxi Key Laboratory of Low Carbon Energy Materials, Guangxi Normal University, Guilin, 541004, China
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Kumar A, Barbhuiya NH, Jashrapuria K, Dixit N, Arnusch CJ, Singh SP. Magnéli-Phase Ti 4O 7-Doped Laser-Induced Graphene Surfaces and Filters for Pollutant Degradation and Microorganism Removal. ACS APPLIED MATERIALS & INTERFACES 2022; 14:52448-52458. [PMID: 36349685 DOI: 10.1021/acsami.2c10348] [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] [Indexed: 06/16/2023]
Abstract
Laser-induced graphene (LIG) has recently become a point of attraction globally as an environmentally friendly method to fabricate graphene foam in a single step using a CO2 laser. The electrical properties of LIG are studied in different environmental applications, such as bacterial inactivation, antibiofouling, and pollutant sensing. Furthermore, metal or nonmetal doping of graphene enhances its catalytical performance in pollutant degradation and decontamination. Magnéli phase (TinO2n-1) is a substoichiometric titanium oxide known for its high electrocatalytic behavior and chemical inertness and is being explored as a membrane or electrode material for environmental decontamination. Here, we show the fabrication and characterization of LIG-Magnéli-phase (Ti4O7) titanium suboxide composites as electrodes and filters on poly(ether sulfone). Unlike undoped LIG electrodes, the doped Ti4O7-LIG electrodes exhibit enhanced electrochemical activity, as demonstrated in electrochemical characterization using cyclic voltammetry and electrochemical impedance spectroscopy. Due to the in situ generation of hydroxyl radicals on the surface, the doped electrodes exhibit increase in methylene blue degradation and microorganism removal. Effects of voltage and doping were examined, resulting in a clear trend of degradation and decontamination performance proportional to the doping concentration and applied voltage giving the best result at 2.5 V for 10% Ti4O7 doping. The LIG-Ti4O7 surfaces also showed biofilm inhibition against mixed bacterial culture. The flow-through filtration using a LIG-Ti4O7 conductive filter showed complete bacterial killing with 6 log removal in the permeate at 2.5 V, an enhancement of ∼2.5 log compared to undoped LIG filters at a flow rate of ∼500 L m-2 h-1. The facile fabrication of Ti4O7-doped LIG with enhanced electrochemical properties can be effectively used for energy and environmental applications.
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Affiliation(s)
- Ashish Kumar
- Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai400076, India
| | - Najmul H Barbhuiya
- Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai400076, India
| | - Kritika Jashrapuria
- Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai400076, India
| | - Nandini Dixit
- Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai400076, India
| | - Christopher J Arnusch
- Department of Desalination and Water Treatment, Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben Gurion8499000, Israel
| | - Swatantra P Singh
- Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai400076, India
- Interdisciplinary Program in Climate Studies, Indian Institute of Technology Bombay, Mumbai400076, India
- Centre for Research in Nanotechnology & Science (CRNTS), Indian Institute of Technology Bombay, Mumbai400076, India
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6
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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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7
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Liu H, Fu H, Liu Y, Chen X, Yu K, Wang L. Synthesis, characterization and utilization of oxygen vacancy contained metal oxide semiconductors for energy and environmental catalysis. CHEMOSPHERE 2021; 272:129534. [PMID: 33465617 DOI: 10.1016/j.chemosphere.2021.129534] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Revised: 12/28/2020] [Accepted: 12/30/2020] [Indexed: 06/12/2023]
Abstract
Developing novel functional materials with promising desired properties in enhancing energy conversion and lowering the catalytic reaction barriers is essential for the demand to solve the increasingly severe energy and environmental crisis nowadays. Metal oxide semiconductors (MOS) are widely used in the field of catalysis because of its excellent catalytic characteristics. Introduction of defects, in addition to the adjustment of composition and atomic arrangement in the materials can effectively improve the materials' catalytic performance. Especially, introducing oxygen vacancies (OVs) into the lattice structure of MOS has been developed as a facile route to improve MOS's optical and electronic transmission characteristics. And a large number of metal oxides with rich OVs have been served in oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reaction (HER), carbon dioxide reduction reaction (CO2-RR) photo-degradation of organic pollutants, etc. This small review briefly outlines some preparation techniques to introduce OVs into MOS, and the characterization techniques to identify and quantify the OVs in MOS. The applications of OVs contained MOS especially in energy and environmental catalysis areas are also discussed. The effects of OVs types and concentrations on the catalytic performances are deliberated. Finally, the defective structure-catalytic property relationship is highlighted, and the future status and opportunities of MOS containing OVs in the catalytic field are suggested.
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Affiliation(s)
- Hongjie Liu
- School of Chemistry & Chemical Engineering, Guangxi University, Nanning, 530004, China; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning, 530004, China; School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China
| | - Hao Fu
- School of Chemistry & Chemical Engineering, Guangxi University, Nanning, 530004, China; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning, 530004, China; School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China
| | - Yuchang Liu
- School of Marine Sciences, Guangxi University, Nanning, 530004, China
| | - Xiyong Chen
- MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning, 530004, China; School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China.
| | - Kefu Yu
- School of Marine Sciences, Guangxi University, Nanning, 530004, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519080, China.
| | - Liwei Wang
- School of Marine Sciences, Guangxi University, Nanning, 530004, China; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning, 530004, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519080, China.
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Nagao M, Misu S, Hirayama J, Otomo R, Kamiya Y. Magneli-Phase Titanium Suboxide Nanocrystals as Highly Active Catalysts for Selective Acetalization of Furfural. ACS APPLIED MATERIALS & INTERFACES 2020; 12:2539-2547. [PMID: 31868342 DOI: 10.1021/acsami.9b19520] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Alongside TiO2, Magneli-phase titanium suboxide having the composition of TinO2n-1 is a kind of attractive functional materials composed of titanium. However, there still remain problems to be overcome in the synthesis of titanium suboxide; the existing synthesis methods require high temperature typically over 1000 °C and/or postsynthesis purification. This study presents a novel approach to synthesis of titanium suboxide nanoparticles through solid-phase reaction of TiO2 with TiH2. Crystal phases of titanium suboxide were easily controlled by changing TiO2/TiH2 molar ratios in a TiO2-TiH2 mixed precursor, and a series of titanium suboxide nanoparticles including Ti2O3, Ti3O5, Ti4O7, and Ti8O15 were successfully obtained. The reaction of TiO2 with TiH2 proceeded at a relatively low temperature due to the high reactivity of TiH2, giving titanium suboxide nanoparticles without any postsynthesis purification. Ti2O3 nanoparticles and TiO2 were applied as solid acid catalysts for reaction of furfural with 2-propanol. Ti2O3 showed a high catalytic activity and high selectivity for acetalization of furfural, while TiO2 showed only poor activity for transfer hydrogenation of furfural. The difference in catalytic properties is discussed in terms of the acid properties of Ti2O3 and TiO2.
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Jagminas A, Ramanavičius S, Jasulaitiene V, Šimėnas M. Hydrothermal synthesis and characterization of nanostructured titanium monoxide films. RSC Adv 2019; 9:40727-40735. [PMID: 35542679 PMCID: PMC9076268 DOI: 10.1039/c9ra08463k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 12/02/2019] [Indexed: 12/27/2022] Open
Abstract
At the present time, the formation of titanium monoxide (TiO x ) two dimensional (2D) species with distinct composition, size, shape, and a significantly reduced bandgap (E g) value compared to TiO2 is of great scientific and practical importance. This paper describes our findings investigating Ti surface oxidation for the formation of TiO x films possessing a densely-packed nanoplatelet morphology and a low bandgap value. This goal was herein achieved by the hydrothermal treatment of the Ti surface in selenious acid solution kept at a slightly alkaline pH. Furthermore, the nanoplatelet design not typical for TiO2 porous films was created by this method for the first time. The formation of titanium monoxide, particularly TiO0.84, as a major crystalline phase, was verified by XRD and confirmed by EPR investigations. It is worth noting that these nanoplatelet-shaped films with a thickness of 0.1-0.25 μm exhibited a very large shift of their light absorption threshold, down to 1.29 eV, compared to the E g of anatase TiO2 and a surprising 70% porosity determined via simulation of experimental reflection plots. It is anticipated that this unique TiO x nanomaterial will pave the way for new investigations and applications.
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Affiliation(s)
- Arūnas Jagminas
- State Research Institute Centre for Physical Sciences and Technology Sauletekio Ave. 3 LT-10257 Vilnius Lithuania
| | - Simonas Ramanavičius
- State Research Institute Centre for Physical Sciences and Technology Sauletekio Ave. 3 LT-10257 Vilnius Lithuania
| | - Vitalija Jasulaitiene
- State Research Institute Centre for Physical Sciences and Technology Sauletekio Ave. 3 LT-10257 Vilnius Lithuania
| | - Mantas Šimėnas
- Faculty of Physics, Vilnius University Sauletekio Ave. 9 LT-10222 Vilnius Lithuania
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Synthesis, characterizations, and utilization of oxygen-deficient metal oxides for lithium/sodium-ion batteries and supercapacitors. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.06.015] [Citation(s) in RCA: 125] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Baktash E, Capitolis J, Tinat L, Larquet C, Chan Chang THC, Gallet JJ, Bournel F, Sanchez C, Carenco S, Portehault D. Different Reactivity of Rutile and Anatase TiO 2 Nanoparticles: Synthesis and Surface States of Nanoparticles of Mixed-Valence Magnéli Oxides. Chemistry 2019; 25:11114-11120. [PMID: 31157934 DOI: 10.1002/chem.201901592] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 05/30/2019] [Indexed: 11/09/2022]
Abstract
Magnéli phases Tin O2n-1 (3<n≤10) are mixed Ti4+ /Ti3+ oxides with high electrical conductivity. When used for water remediation or electrochemical energy storage and conversion, they are nanostructured and exposed to various environments. Therefore, understanding their surface reactivity is of prime importance. Such studies have been hindered by carbon contamination from syntheses. Herein, this synthetic and characterization challenge is addressed through a new approach to 50 nm carbon-free Ti4 O7 and Ti6 O11 nanoparticles. It takes advantage of the different reactivities of rutile and anatase TiO2 nanoparticles towards H2 , to use the former as precursor of Tin O2n-1 and the latter as a diluting agent. This approach is combined with silica templating to restrain particle growth. The surface reactivity of the Magnéli nanoparticles under different atmospheres was then evaluated quantitatively by synchrotron-radiation-based X-ray photoelectron spectroscopy, which revealed oxidized surfaces with lower conductivity than the core. This finding sheds a new light on the charge transfer occurring in these materials.
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Affiliation(s)
- Elham Baktash
- Laboratoire de Chimie de la Matière Condensée de Paris (CMCP), Sorbonne Université, CNRS, Collège de France, 4 place Jussieu, Paris, 75005, France
| | - Jérôme Capitolis
- Laboratoire de Chimie de la Matière Condensée de Paris (CMCP), Sorbonne Université, CNRS, Collège de France, 4 place Jussieu, Paris, 75005, France
| | - Lionel Tinat
- Laboratoire de Chimie de la Matière Condensée de Paris (CMCP), Sorbonne Université, CNRS, Collège de France, 4 place Jussieu, Paris, 75005, France
| | - Clément Larquet
- Laboratoire de Chimie de la Matière Condensée de Paris (CMCP), Sorbonne Université, CNRS, Collège de France, 4 place Jussieu, Paris, 75005, France
| | - Tsou Hsi Camille Chan Chang
- Laboratoire de Chimie de la Matière Condensée de Paris (CMCP), Sorbonne Université, CNRS, Collège de France, 4 place Jussieu, Paris, 75005, France
| | - Jean-Jacques Gallet
- Laboratoire de Chimie Physique, Matière et Rayonnement (LPCMR), Sorbonne Université, CNRS, 4 Place Jussieu, Paris, 75005, France.,Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192, Gif sur Yvette Cedex, France
| | - Fabrice Bournel
- Laboratoire de Chimie Physique, Matière et Rayonnement (LPCMR), Sorbonne Université, CNRS, 4 Place Jussieu, Paris, 75005, France.,Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192, Gif sur Yvette Cedex, France
| | - Clément Sanchez
- Laboratoire de Chimie de la Matière Condensée de Paris (CMCP), Sorbonne Université, CNRS, Collège de France, 4 place Jussieu, Paris, 75005, France
| | - Sophie Carenco
- Laboratoire de Chimie de la Matière Condensée de Paris (CMCP), Sorbonne Université, CNRS, Collège de France, 4 place Jussieu, Paris, 75005, France
| | - David Portehault
- Laboratoire de Chimie de la Matière Condensée de Paris (CMCP), Sorbonne Université, CNRS, Collège de France, 4 place Jussieu, Paris, 75005, France
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12
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Poly(vinylpyrrolidone) tailored porous ceria as a carbon-free support for methanol electrooxidation. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.09.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Azor-Lafarga A, Ruiz-González L, Parras M, Portehault D, Sanchez C, González-Calbet JM. Modified Synthesis Strategies for the Stabilization of low n Ti n O 2n-1 Magnéli Phases. CHEM REC 2018; 18:1105-1113. [PMID: 29488685 DOI: 10.1002/tcr.201700083] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 02/16/2018] [Indexed: 11/11/2022]
Abstract
Titanium reduced oxides TiO2-x occupy, since long time, a prominent place on the landscape of binary metal oxides because of their intriguing ability to form extended defects that affect both the formation of new superlattices and different electronic behaviours. Related to these features, a wide range of practical applications has been achieved. Moved by the conviction of the great potential of understanding the influence of the reactivity, compositional variations and size effects on their functional properties, the aim of this personal account is the optimization of a recently developed strategy for the stabilization of low n Tin O2n-1 terms. In particular, we will focus on the Ti4 O7 composition as well as the incorporation of transition metals, like Mn, in order to deal with new reduced Magnéli phases.
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Affiliation(s)
- A Azor-Lafarga
- Department of Inorganic Chemistry Faculty of Chemistry, Universidad Complutense de Madrid, Madrid, 28040, Spain
| | - L Ruiz-González
- Department of Inorganic Chemistry Faculty of Chemistry, Universidad Complutense de Madrid, Madrid, 28040, Spain
| | - M Parras
- Department of Inorganic Chemistry Faculty of Chemistry, Universidad Complutense de Madrid, Madrid, 28040, Spain
| | - D Portehault
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, 4 place Jussieu, 75005, Paris, France
| | - C Sanchez
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, 4 place Jussieu, 75005, Paris, France
| | - J M González-Calbet
- Department of Inorganic Chemistry Faculty of Chemistry, Universidad Complutense de Madrid, Madrid, 28040, Spain
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14
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Barama S, Davidson A, Barama A, Boukhlouf H, Casale S, Calers C, Brouri D, Domingos C, Djadoun A. Dephosphatation under UV light of water by Ti-PILC with activation by secondary species (La, Se, and Rb). CR CHIM 2017. [DOI: 10.1016/j.crci.2016.05.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Poochai C, Veerasai W, Somsook E, Dangtip S. Dealloyed ternary Cu@Pt-Ru core-shell electrocatalysts supported on carbon paper for methanol electrooxidation catalytic activity. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.11.098] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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He C, Tao J, He G, Shen PK. Ultrasmall molybdenum carbide nanocrystals coupled with reduced graphene oxide supported Pt nanoparticles as enhanced synergistic catalyst for methanol oxidation reaction. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.09.037] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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He C, Tao J, He G, Shen PK, Qiu Y. Small size Mo2C nanocrystal coupled with reduced graphene oxide enhance the electrochemical activity of palladium nanoparticles towards methanol oxidation reaction. Catal Sci Technol 2016. [DOI: 10.1039/c6cy01299j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A small-sized Mo2C nanoparticle on reduced graphene oxide (RGO) nanosheet hybrid (Mo2C–RGO) was applied as a co-catalyst to Pd nanoparticles to form a highly dispersed heterogeneous catalyst (Pd/Mo2C–RGO).
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Affiliation(s)
- Chunyong He
- Institute of High Energy Physics
- Chinese Academy of Sciences (CAS)
- Beijing 100049
- China
- Dongguan Neutron Science Center
| | - Juzhou Tao
- Institute of High Energy Physics
- Chinese Academy of Sciences (CAS)
- Beijing 100049
- China
- Dongguan Neutron Science Center
| | - Guoqiang He
- Collaborative Innovation Center of Sustainable Energy Materials
- Guangxi University
- Nanning
- PR China
| | - Pei Kang Shen
- Collaborative Innovation Center of Sustainable Energy Materials
- Guangxi University
- Nanning
- PR China
| | - Yongfu Qiu
- College of Chemistry and Environmental Engineering
- Dongguan University of Technology
- PR China
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18
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He C, Tao J, He G, Shen PK, Qiu Y. Unravelling the promoting effect of the ultrathin TaC/RGO nanosheet hybrid for enhanced catalytic activity of Pd nanoparticles. Catal Sci Technol 2016. [DOI: 10.1039/c6cy01043a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A novel two-dimensional ultrathin TaC/reduced graphene oxide (RGO) nanosheet hybrid was employed as a co-catalyst to Pd nanoparticles (Pd/TaC-G).
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Affiliation(s)
- Chunyong He
- Institute of High Energy Physics
- Chinese Academy of Sciences (CAS)
- Beijing 100049
- China
- Dongguan Neutron Science Center
| | - Juzhou Tao
- Institute of High Energy Physics
- Chinese Academy of Sciences (CAS)
- Beijing 100049
- China
- Dongguan Neutron Science Center
| | - Guoqiang He
- Collaborative Innovation Center of Sustainable Energy Materials
- Guangxi University
- Nanning
- PR China
| | - Pei Kang Shen
- Collaborative Innovation Center of Sustainable Energy Materials
- Guangxi University
- Nanning
- PR China
| | - Yongfu Qiu
- College of Chemistry and Environmental Engineering
- Dongguan University of Technology
- PR China
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19
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Xu B, Sohn HY, Mohassab Y, Lan Y. Structures, preparation and applications of titanium suboxides. RSC Adv 2016. [DOI: 10.1039/c6ra14507h] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The crystal structure, physical and chemical properties, preparation methods and applications of titanium suboxides (TinO2n−1, n = integer greater than one) have recently attracted tremendous attention.
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Affiliation(s)
- Baoqiang Xu
- State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization
- National Engineering Laboratory for Vacuum Metallurgy
- Yunnan Provincial Key Laboratory for Nonferrous Vacuum Metallurgy
- Kunming University of Science and Technology
- Kunming 650093
| | - Hong Yong Sohn
- Department of Metallurgical Engineering
- University of Utah
- Salt Lake City
- USA
| | - Yousef Mohassab
- Department of Metallurgical Engineering
- University of Utah
- Salt Lake City
- USA
| | - Yuanpei Lan
- Department of Metallurgical Engineering
- University of Utah
- Salt Lake City
- USA
- College of Material Science & Engineering
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