MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
·
IF 3.927
Yang Ren,Haiyan He,Yunwei Wang,Ying Gong,Gaoyang Zhao
In this study, the F–Nb co-doped TiO 2 films (TFNO) were prepared on soda lime glass using the sol-gel method. Multielement doping was carried out to further improve the conductivity of Nb-doped TiO 2 (TNO) thin films by increasing the carrier concentration. The effect of fluorine doping on the microstructure, chemical composition, and optoelectronic properties of the TFNO films was investigated. The results show that the obtained films are polycrystalline with an anatase structure. Both niobium and fluorine are present in the TiO 2 films (as Nb 5+ and F − ). With increasing fluorine doping, the visible-light transmittance of the film increases slightly, and the carrier concentration continues to increase until saturation. However, the carrier mobility decreases gradually. The TFNO film exhibits the optimal optoelectronic properties, when the F:Ti atomic ratio is 0.5:1, reaching a resistivity of 0.02 Ω cm and a visible-light transmittance of 81%.
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ACS Applied Nano Materials
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2020
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IF 0
Wei Zhao,Shuang Liu,Huishu Wang,Jun Yang,Xinhan Chen
Heterogeneous Pd has been developed as a well-known catalyst for debenzylation reactions via hydrogenative C–N bond cleavage. However, the extensive applications are still limited owing to a high loading and usage amount of the noble metal. Herein, well-dispersed Pd nanocatalysts over TiO2 were explored with a deposition–precipitation method and characterized by FESEM, physical adsorption, XRD, TEM, and XPS. It was proposed that the ultrasmall and electron-rich Pd nanoparticles can be enhanced over TiO2 rather than C, Al2O3, or SiO2. As representatives, the debenzylations of hexabenzylhexaazaisowurtzitane (HBIW) and tetraacetyldibenzylhexaazaisowurtzitane (TADBIW), which are key steps for the synthesis of CL-20 with the highest energy and density, were selected to evaluate the catalytic performances. It was found that Pd/TiO2 exhibited considerably low usage with high yields in the debenzylation processes of not only HBIW (1 wt ‰) but also TADBIW (4 wt ‰). Meanwhile, the superior catalytic activities can be maintained in the different reaction scales and can be repeated for TADBIW hydrodebenzylation. Hence, Pd nanoparticles supported on TiO2 can be considered to be suitable catalysts for highly efficient catalytic synthesis for hydrogenative C–N bond cleavage.
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GREEN CHEMISTRY
·
2020
·Vol. 23
·期 3
·1382-1388
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IF 9.48
Liang Chen,Yiming Huang,Ren Zou,Jiliang Ma,Yunyi Yang,Tingzhen Li,Mingsai Li,Qi Hao,Haibo Xie,Xinwen Peng
Synthesis of D-xylonic acid, a high value chemical feedstock, from biomass chemicals through a photocatalytic process is of great significance in respect of economical and sustainable concerns, and therefore has aroused considerable attention. Herein, a TiO2/Ti3C2(TT) photocatalyst was designed for the oxidation of xylose to D-xylonic acid under ambient conditions. The photocatalyst is fabricated by in situ growth of TiO2 nano-particles on Ti3C2 nanosheets and exhibits 64.2% of D-xylonic acid yield with excellent stability. The mechanistic study indicates that the electron transfer from TiO2 to Ti3C2 significantly increases the life time of light-induced charge carriers, and hence improved photocatalytic performance.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Junli Wang,Shaopeng Li,Tingting Wang,Fan Guan,Lijun Zhao,Longhua Li,Junhao Zhang,Guanjun Qiao
Semiconductor-sensitized TiO2 thin films with long-term air stability are attractive for optoelectronic devices and applications. Herein, we demonstrate the potential of the TiO2 thin film (∼800 nm in thickness) sensitized with a Sb2Se3 layer (∼350 nm) grown from solution spin coating and processed by annealing recrystallization at 300 °C for high-performance optical detection. The type-II band alignment, p-Sb2Se3/n-TiO2 heterojunction, and narrow band gap of Sb2Se3 (∼1.25 eV) endow the film photodetector with a large photocurrent, high switching stability and on/off ratio (>103), and fast response speeds (<20 ms) under the broadband visible–near-infrared irradiation in a zero-bias self-powered photovoltaic mode. In particular, the photodetector shows notable resistance to oxidation and moisture for long-term operation, which is linked to the modest surface oxidation (Sb–O) of Sb2Se3, as verified by X-ray photoelectron spectroscopy. The first-principles calculations show that a low and medium concentration of oxygen substitution for Se (OSe) and oxygen interstitial (Oi) with negative formation energies can lead to such a moderate surface oxidation but do not generate impurity states or just introduce a shallow-level acceptor state in the electronic structures of Sb2Se3 without degrading its optoelectronic performance. Our theoretical results offer a rational explanation for the air-stable and oxidation/moisture-resistant characteristics in moderately oxidized Sb2Se3 and may shed light on the surface oxidation–property relationship studies of other nonoxide semiconductor-sensitized devices.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 36
·15475-15482
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IF 3.288
Xiaoshu Qu,Yu Fu,Chao Ma,Yanyan Yang,Dan Shi,Dongxue Chu,Xiaoyang Yu
Multifunctional electrode materials have been widely studied in recent years, owing to their various excellent performances. Herein, we report a nanocomposite film based on Dawson-type monolacunary polyoxotungtate K10P2W17O61 and TiO2 nanowires fabricated via hydrothermal and layer-by-layer self-assembly combination methods, in which the bifunctional combination of electrochromism energy storage was successfully realized. Compared to individual K10P2W17O61 thin films, the nanocomposite films showed outstanding electrochromic properties of high coloration efficiency (150.34 cm2 C−1 at 600 nm) and cyclic stability, and the volumetric capacitance of the composite film reaches 172.3 F cm−3 with a working voltage window of 1.77 V. The greater electrochemical properties could be due to the unique 3D structure of the TiO2 NW arrays, which provides a larger electrolyte contact area and a shorter ion diffusion pathway available for the redox reactions. Our study provides a new route to design bifunctional electrode materials with enhanced electrochromism and energy storage functions, making polyoxometalate-based electrode materials more attractive for practical applications.
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Catalysts
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2020
·Vol. 10
·期 8
·942
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IF 3.52
Zhiying Yan,Zijuan He,Mi Li,Lin Zhang,Yao Luo,Jiao He,Yongjuan Chen,Jiaqiang Wang
In order to further improve the photocatalytic performance of the SiO2/TiO2composite under visible light irradiation, curcumin-doped SiO2/TiO2nanocomposites were synthesized via directly incorporating it into the structure of SiO2/TiO2during the synthesis using an inexpensive and readily available natural pigment (curcumin) as doping agent. The physicochemical properties of SiO2/TiO2nanocomposites were characterized in detail by X-ray diffraction, transmission electron microscopy, Fourier transform-infrared spectroscopy, N2adsorption–desorption isotherms, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectroscopy. The results indicate that all SiO2/TiO2nanocomposites exhibited an anatase phase with a typical mesoporous structure. It was found that the dope of curcumin in the SiO2/TiO2composite could decrease the crystal size, slightly improve the specific surface areas, significantly enhance the visible light absorption, and effectively narrow the band gap energy from 3.04 to 10(eV). Compared with bare SiO2/TiO2, the curcumin-doped SiO2/TiO2resulted in enhanced photocatalytic reduction activity for Cr(VI) under visible light irradiation, and the CTS (12) sample with the appropriate content of curcumin of 12 wt % shows the photocatalytic yield reaching 100% within 2.5 hours, which is larger than CT (12) without silica. This could be attributed to the curcumin doping and the synergetic effects of SiO2and TiO2in SiO2/TiO2nanocomposites.Keywords:curcumin pigment;SiO2/TiO2nanocomposites;visible photocatalyst;reduction of Cr (VI)
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yeming Mei,Hongli Liu,Xianggao Li,Shirong Wang
Hollow TiO 2 spheres were synthesized by template method, with the diameters was 200 nm and the thickness of shell about 30 nm. The high-quality perovskite films fabricated on the hollow TiO 2 mesoporous layer demonstrate smooth surface and large grain size, resulting in the better scattering light ability and fewer defects. The efficiency of the perovskite solar cells prepared on hollow mesoporous layer can reach 17.60%, which is an approximately 14% higher than the PCE of conventional mesoporous layer devices under the same condition. Importantly, the solar cells with hollow TiO 2 can exhibit better stability than the cells with mesoporous TiO 2 after aging 30 days in 65% relative humidity under dark conditions. The results indicate that the hollow TiO 2 mesoporous layer will be a candidate for better efficient and stable CH 3 NH 3 PbI 3 perovskite solar cells, and this structure provides a direction for the design of novel mesoporous layers for perovskite solar cells in future.
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Nature Communications
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2020
·Vol. 11
·期 1
·1-12
·
IF 12.121
Wang Rui,Shi Miusi,Xu Feiyan,Qiu Yun,Zhang Peng,Shen Kailun,Zhao Qin,Yu Jiaguo,Zhang Yufeng
Titanium implants have been widely used in bone tissue engineering for decades. However, orthopedic implant-associated infections increase the risk of implant failure and even lead to amputation in severe cases. Although TiO 2 has photocatalytic activity to produce reactive oxygen species (ROS), the recombination of generated electrons and holes limits its antibacterial ability. Here, we describe a graphdiyne (GDY) composite TiO 2 nanofiber that combats implant infections through enhanced photocatalysis and prolonged antibacterial ability. In addition, GDY-modified TiO 2 nanofibers exert superior biocompatibility and osteoinductive abilities for cell adhesion and differentiation, thus contributing to the bone tissue regeneration process in drug-resistant bacteria-induced implant infection.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Zhu Mengting,Tonni Agustiono Kurniawan,Ram Avtar,Mohd Hafiz Dzarfan Othman,Tong Ouyang,Huang Yujia,Zhang Xueting,Tjandra Setiadi,Iswanto Iswanto
We test the feasibility of TiO 2 (B)@carbon composites as adsorbents, derived from wheat straws, for tetracycline (TC) adsorption from aqueous solutions. Hydrochar (HC), biochar (BC), and hydrochar-derived pyrolysis char (HDPC) are synthesized hydrothermally from the waste and then functionalized with TiO 2 (B), named as ‘Composite-1′, ‘Composite-2′, and ‘Composite-3′, respectively. A higher loading of TiO 2 (B) into the HC was also synthesized for comparison, named as ‘Composite-4′. To compare their physico-chemical changes before and after surface modification, the composites are characterized using FESEM-EDS, XRD , BET, FRTEM, and FTIR. The effects of H 2 O 2 addition on TC removal are investigated. Adsorption kinetics and isotherms of TC removal are studied, while TC adsorption mechanisms are elaborated. We found that the Composite-4 has the highest TC removal (93%) at pH 7, 1 g/L of dose, and 4 h of reaction time at 50 mg/L of TC after adding H 2 O 2 (10 mM). The TC adsorption capacities of the Composite-1 and Composite-4 are 40.65 and 49.26 mg/g, respectively. The TC removal by the Composite-1 follows the pseudo-second order. Overall, this suggests that converting the wheat straw into HC and then functionalizing its surface with TiO 2 (B) as a composite has added values to the waste as an adsorbent for wastewater treatment .
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lixin Zhang,Lei Rao,Peifang Wang,Zhenyu Shi,Pingfan Wang
Semiconductor photocatalysis is as a promising method for water pollution remediation. However, the recycling and light capture of powder photocatalysts in traditional suspension systems are bottlenecks for their practical application in photocatalysis. Moreover, the large-scale application of traditional immobilized photocatalytic systems immersed in solution is limited due to the electron-hole recombination and slow reaction rate. Herein, we have successfully prepared superhydrophobic self-floating TiO 2 -silicone composite aerogels by condensation polymerization of γ-methacryloxypropyl trimethoxysilane (KH570) modified anatase TiO 2 and methyltriethoxysilane (MTES). The air–liquid-solid triphase photocatalytic system was constructed using the air layer formed by the superhydrophobic self-floating composite aerogel and the solution interface, which solved the above-mentioned limitation. The floating characteristics of the system effectively avoided the absorption of light by the solution, thereby significantly enhancing the light utilization of the catalyst. The air–liquid-solid interface allows oxygen to be quickly transported from the air to the reaction interface, and oxygen, which is a natural electron scavenger, can effectively remove photoelectrons from the catalyst surface and the recombination of electron-holes is minimized. The new self-floating photocatalyst with triphase catalytic system presented high practical application value for the degradation of suspended pollutants in a natural environment.
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VACUUM
·
2020
·
IF 2.906
Mengnan Nie,Lingling Wang,Zhihao Wang,Jielin Huang,Junwei Zhao,Xin Yu,Quanhui Guo
Nanostructured C–TiO 2-X microspheres were prepared by facile modified solvothermal method and employed as an efficient visible light photocatalyst for photocatalytic antibiotic elimination. The acetone as well as distilled water not only induced the high crystallization of nanostructured C–TiO 2-X microspheres, the formation of C–TiO 2-X nanodots , and oxygen vacancies , but also boosted the assembling of C–TiO 2-X nanodots into nanostructured microspheres. The photocatalytic performance of nanostructured C–TiO 2-X microspheres was evaluated by photocatalytic antibiotic degradation under visible light and Xe lamp irradiation. The prepared C–TiO 2-X microspheres showed highly improved visible light absorption, charge separation, and visible light photocatalytic activity . The visible light photocatalytic activity of nanostructured C–TiO 2-x -180 microspheres was approximately 3.14 times of commercial TiO 2 , which could be attributed to the construction of unique nanostructures , oxygen vacancies, and carbon doping for efficient solar light harvesting and utilization, the diffusion of degraded products, and charge separation. Besides, the detailed energy band structures , active species for visible light photocatalytic tetracycline degradation, and visible light photocatalytic mechanism of nanostructured C–TiO 2-X microspheres were also proposed in the work.
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JOURNAL OF CHEMICAL RESEARCH
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2020
·
IF 0.593
Chunping Xiao,Lili Ji,Dehui Li,Louqun Wang,Jing Yang
Photoelectrochemical biofuel cells can convert light and chemical energy into electrical energy using a dye-sensitized titania (TiO2) fluorine-doped tin oxide photoanode and a platinum-coated fluorine-doped tin oxide cathode. TiO2 of the photoanode serves both as a support for dyes and as an electron-transporting medium, the structure of which can limit electron trapping and charge transporting and then affect the performance of the photoelectrochemical biofuel cells. TiO2 nanotube array films have been shown to enhance the efficiencies of both charge collection and electron injection, and hence a vertically aligned TiO2 nanotube array is investigated as a conductor for the tetrakis(4-carboxyphenyl)porphyrin dye to construct a new two-compartment photoelectrochemical biofuel cell. The photoelectrochemical biofuel cell containing the TiO2 nanotube array photoanode yields a short-circuit (Isc) current of 110 μA and an open-circuit (Voc) potential of 1010 mV. In contrast, the photovoltaic parameters, Isc and Voc of the photoelectrochemical biofuel cell with the mesoporous TiO2 nanocrystal fluorine-doped tin oxide photoanode, are 96.96 μA and 740 mV, respectively. Photovoltaic measurements show that the maximum incident photon-to-collected electron conversion efficiency was 58% at 430 nm through the spectral range (400–800 nm) for the photoelectrochemical biofuel cell with the TiO2 nanotube array fluorine-doped tin oxide photoanode. These results revealed that the TiO2 nanotube array had great potential for the photoelectrochemical biofuel cells.
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