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Facile synthesis of thin black TiO2 ? x nanosheets with enhanced lithium-storage capacity and visible light photocatalytic hydrogen production
摘要： In combination of a facile and scalable solvothermal method and solid-phase reduction reactions, a novel two-dimensional black TiO2 ? x nanosheet (TiO2 ? x NS) with high specific surface area of 108 m2 g?1 and nearly total solar spectral absorption capability have been successfully prepared. With careful characterizations, the novel TiO2 ? x NS showed enhanced electrochemical performance and visible-light photocatalytic activity than those of their white TiO2 nanosheet (TiO2 NS) precursors. The black TiO2 ? x NS electrode delivered a reversible specific capacity of 160 mA h g?1 even after cycling at 0.5 C (1 C = 190 mA h g?1) for 300 times, which was significantly higher than the corresponding white TiO2 NS electrode (104 mA h g?1). Meanwhile, the TiO2 ? x NS also exhibited enhanced ability of visible-light photocatalytic hydrogen production than that of the white TiO2 NS. It is expected that making white TiO2 NS into black ones is an effective way to design the photocatalysts with visible light response and the anodes with long lifetime and high rate performance in lithium ion batteries. The novel black TiO2 ? x NS could find potential applications in the field of environmental management and energy storage and conversion.
关键词： Solvothermal method,Photocatalysis,Black TiO2 ? x nanosheets,Anodes
更新于2025-09-23 15:23:52
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Enhanced photocatalytic activity under visible light by the synergistic effects of plasmonics and Ti3+-doping at the Ag/TiO2- heterojunction
摘要： A heterojunction of plasmonic Ag particles on Ti3+-doped macro-/meso-porous TiO2 framework consisting of parallel microchannels, denoted as Ag/TiO2-x, has been fabricated by a simple microwave-assisted process employing vitamin C as the reducing agent for forming TiO2-x framework followed by photochemical deposition of Ag particles. Charge transport and recombination processes were detected through transient photocurrent responses. The visible-light photocatalytic hydrogen production rate and the apparent reaction rate constant of RhB photodegradation with 3%-Ag/TiO2-x catalyst are about 5.3 and 14.0 fold higher than those with the pristine macro-/meso-porous TiO2 framework, respectively. A mechanism based on the synergistic effects of Ag plasmonics and Ti3+-doping at the Ag/TiO2-x heterojunction is proposed, which consistently explains the high photocatalytic performance in hydrogen evolution and the improved photocatalytic decomposition of RhB under visible light. This study demonstrates the effective route to synthesize new heterojunction photocatalytic materials with multifunctional properties using low-cost and rapid microwave processes.
关键词： Macroporous/mesoporous TiO2 microchannel,Ag/TiO2-x heterojunction,Ti3+-doped TiO2,Photocatalysis,Surface plasmon resonance
更新于2025-09-23 15:19:57
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Oxygen Atmosphere Annealing Effect on the Thermal Stability of TiO<sub>2-x</sub> Based Films for Shutter-Less Infrared Image Sensors
摘要： In the present study, we examine the thermal stability of TiO2-x (TiO) and Nb:TiO2-x (TNO) films at different exposing temperatures for the as-deposited and oxygen-atmosphere annealed samples. In order to attain the good thermal stability characteristics, lower resistance of the TiO and TNO samples were annealed in oxygen gas atmosphere at a high flow rate (5 lit/min) of oxygen gas and annealing time (25 min). From the structural studies, it can be confirmed that the annealing process gives the incorporation of oxygen atoms to its vacant sites and the phase transition improvement from the amorphous to rutile structure. The annealed samples reveal the high resistivity and temperature coefficient of resistance (TCR) values than as-deposited samples. Furthermore, it was confirmed that the annealed samples exhibits a significant improvement of thermal stability compared to the as-deposited samples. As a result, the annealed TNO sample exhibits outstanding thermal stability as well as better bolometric performance. Consequently, this study reveals that the annealed TNO sample is appropriate for shutter-less infrared image sensor devices.
关键词： TiO2-x film,Bolometric properties,Thermal stability.,Annealing
更新于2025-09-19 17:15:36
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Photocatalytic inactivation of <i>Escherischia coli</i> under UV light irradiation using large surface area anatase TiO <sub/>2</sub> quantum dots
摘要： In this study, high specific surface areas (SSAs) of anatase titanium dioxide (TiO2) quantum dots (QDs) were successfully synthesized through a novel one-step microwave–hydrothermal method in rapid synthesis time (20 min) without further heat treatment. XRD analysis and HR-TEM images showed that the as-prepared TiO2 QDs of approximately 2 nm size have high crystallinity with anatase phase. Optical properties showed that the energy band gap (Eg) of as-prepared TiO2 QDs was 3.60 eV, which is higher than the standard TiO2 band gap, which might be due to the quantum size effect. Raman studies showed shifting and broadening of the peaks of TiO2 QDs due to the reduction of the crystallite size. The obtained Brunauer–Emmett–Teller specific surface area (381 m2 g?1) of TiO2 QDs is greater than the surface area (181 m2 g?1) of commercial TiO2 nanoparticles. The photocatalytic activities of TiO2 QDs were conducted by the inactivation of Escherischia coli under ultraviolet light irradiation and compared with commercially available anatase TiO2 nanoparticles. The photocatalytic inactivation ability of E. coli was estimated to be 91% at 60 μg ml?1 for TiO2 QDs, which is superior to the commercial TiO2 nanoparticles. Hence, the present study provides new insight into the rapid synthesis of TiO2 QDs without any annealing treatment to increase the absorbance of ultraviolet light for superior photocatalytic inactivation ability of E. coli.
关键词： TiO2,X-ray diffraction,quantum dots,photocatalysis,microwave–hydrothermal
更新于2025-09-11 14:15:04
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Controllable Synthesis of Inverse Opal TiO2-x Photonic Crystals and Their Photoelectric Properties
摘要： In this study, inverse opal TiO2-x photonic crystal (IO-TiO2-x) has been successfully synthesized by a two-step calcination. The whole synthesis is safe and feasible. Additionly, the reduction degree and the structure of IO-TiO2-x can be precisely controlled. A series of IO-TiO2-x samples with different reduction degree were prepared and characterized. The TEM images show that the obtained samples possess a 3D-ordered macroporous inverse opal structure. The reduced Ti atoms/oxygen vacancies were confirmed by Raman and XPS spectra results. All the IO-TiO2-x samples showed better photoelectric properties than those of common TiO2 which indicates great potential to be applied to photoelectric fields. The improvement of photoelectric properties is attributed to the efficient electron-hole separation efficiency induced by moderately reduced Ti atoms/oxygen vacancies. Meanwhile, the 3D-ordered macroporous inverse opal structure and the bandgap are regulated to “capture” more solar energy. This new approach is proves to be a meaningful method to synthesize high-performance TiO2 material.
关键词： reduction,oxygen vacancy,TiO2-x,inverse opal
更新于2025-09-10 09:29:36