MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
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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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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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Sustainable Energy & Fuels
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2020
·Vol. 5
·期 1
·261-266
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IF 5.503
Jiancong Wu,Wenya Guo,Zhengxin Ding,Jinshui Zhang,Yidong Hou
Iron vanadate (FeVO4) is a promising photoanode for photoelectrochemical (PEC) water splitting because of its unique electronic band structure, in particular the bandgap of 2.1 eV. However, its PEC performance is limited by the charge recombination at transparent conducting substrate/photoanode interface. Herein, we demonstrate that the introduction of an ultrathin (1.1 nm) TiO2 layer between FTO and an FeVO4 photoanode by atomic layer deposition (ALD) technology can well address the issue of interfacial charge recombination, this is because the large valence band offset between TiO2 and FeVO4 can effectively suppress back hole transfer and subsequently improve charge separation. As expected, the modified photoanode exhibited an enhanced PEC water splitting performance. We believe that the strategy of fabricating an ultrathin TiO2 interfacial layer as a hole blocking barrier can also benefit other photoanodes.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Guohui Li,Yuanyuan Sun,Qingming Zhang,Zhe Gao,Wei Sun,Xiaoxia Zhou
Photocatalytic reduction of CO 2 into high added-value chemical products has received special attention. Herein, we designed a novel hierarchically porous and defective TiO 2 modified by Ag quantum dots via a hydrothermal process assisted with organic surfactant and subsequently in-situ photodeposition method. The obtained Ag quantum dots modified TiO 2 (Ag/TiO 2 ) shows excellent and stable photocatalytic activity in CO 2 reduction. In addition, the competing H 2 evolution can be completely suppressed. The super photocatalytic activity can be ascribed to the design of hierarchically porous, the intrinsic defects in TiO 2 , the localized surface plasmon resonance of Ag and the synergetic effect between Ag quantum dots and defective TiO 2 , which jointly improves the CO 2 adsorption performance, enhances visible light absorption capacity and accelerates the separation of photogenerated charges. This work may provide a strategy to design and synthesis defective and hierarchically porous metal oxides for photocatalytic CO 2 reduction.
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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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JOURNAL OF CHEMICAL RESEARCH
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2020
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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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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 32
·期 1
·277-289
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IF 2.22
Li Qian,Qi Jiqiu,Song Jian,Zhu Lei,Zhao Yulong
In this work, we investigate how TiO 2 nanotube and nanosheet composite mesoporous TiO 2 layers can improve the power conversion efficiency (PCE) of perovskite solar cells (PSCs) with respect to pure mesoporous TiO 2 . Pure and nanotube/nanosheet composite TiO 2 , nanostructure of three different concentrations (0.5, 1, and 3 mol%) were synthesized by a simple, hydrothermal method and characterized by XRD, SEM, transmission electron microscopy (TEM), and UV–Vis diffuse reflection spectroscopy. TiO 2 nanotubes and TiO 2 nanosheets were incorporated into the TiO 2 porous layer of perovskite solar cell, which outperform cells using pure TiO 2 in several ways: higher open-circuit voltage ( V oc ) (1.06 V), power conversion efficiency (PCE) (15.58%), short-circuit current ( J sc ), and fill factor (FF). These properties improvements are attributed to the better properties of modulated TiO 2 as compared to TiO 2 such as better optical transmission properties, faster electron transfer rate and higher electron lifetime. This work provides a simple and effective strategy to improve TiO 2 porous layer, which is significant for the study of the cell porous layer in perovskite solar.
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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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Nature Communications
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2020
·Vol. 11
·期 1
·1-12
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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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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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MOLECULES
·
2020
·Vol. 25
·期 5
·1199
·
IF 3.267
Tong Zhu,Hang Wang,Libin Zang,Sila Jin,Shuang Guo,Eungyeong Park,Zhu Mao,Young Mee Jung
Quantitative analysis of formaldehyde (HCHO, FA), especially at low levels, in various environmental media is of great importance for assessing related environmental and human health risks. A highly efficient and convenient FA detection method based on surface-enhanced Raman spectroscopy (SERS) technology has been developed. This SERS-based method employs a reusable and soft silver-coated TiO2nanotube array (TNA) material, such as an SERS substrate, which can be used as both a sensing platform and a degradation platform. The Ag-coated TNA exhibits superior detection sensitivity with high reproducibility and stability compared with other SERS substrates. The detection of FA is achieved using the well-known redox reaction of FA with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AHMT) at room temperature. The limit of detection (LOD) for FA is 1.21 × 10−7M. In addition, the stable catalytic performance of the array allows the degradation and cleaning of the AHMT-FA products adsorbed on the array surface under ultraviolet irradiation, making this material recyclable. This SERS platform displays a real-time monitoring platform that combines the detection and degradation of FA.Keywords:formaldehyde;SERS;Raman;semiconductor;TiO2
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