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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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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CHEMICAL ENGINEERING JOURNAL
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2021
·
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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Nano Energy
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2020
·
IF 16.602
Jieru Wu,Wenwei Wang,Yao Tian,Chunxiao Song,Hong Qiu,Hao Xue
The effective separation of photo-generated electrons and holes is an important factor that determines the photocatalytic efficiency of the catalysts. Here, we propose a core/shell BaTiO 3 /TiO 2 nanocomposites that present enhanced photocatalytic performance through a piezotronic effect. The polarization generated by the piezoelectric phase in the BaTiO 3 /TiO 2 nanofibers prepared by the electrospinning method under ultrasonic activation dramatically improves the photocatalytic performance of the catalysts. Under the co-excitation of ultrasonic and ultraviolet irradiation, the oxidation rate constant of the polarized BaTiO 3 /TiO 2 nanofibers on RhB dye can reach 9.67 × 10 −2 min −1 , which is 3.51 times and 3.22 times of the corresponding values of TiO 2 nanofibers and BaTiO 3 /TiO 2 nanofibers under only UV irradiation, respectively. This paper provides a promising strategy for improving photocatalytic performance through mechanical vibration and helps to understand the coupling mechanism between piezoelectric and photocatalytic effects.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Dandan Cao,Qingyao Wang,Yue Wu,Shuxu Zhu,Yao Jia,Renliang Wang
Bi/Bi 2 MoO 6 /TiO 2 NTs photocatalysts were synthesized on the basis of TiO 2 NTs by a solvothermal method using glucose as the reducing agent. The removal of organic dyes such as RhB and MB and heavy metal ions like Cr(VI) were used to simulate industrial wastewater for the photocatalytic activity assessment of Bi/Bi 2 MoO 6 /TiO 2 NTs. Na 2 S/Na 2 SO 3 solution was used as sacrificial agent to study the photocatalytic hydrogen generation performance of samples. The results showed that Bi 3+ was successfully reduced to metal Bi and deposited on the surface of Bi 2 MoO 6 . The removal efficiencies of RhB, MB and Cr(VI) reached 73.21%, 92.98% and 70.54%, respectively, which confirmed the excellent photocatalytic activity of samples. The photocatalytic hydrogen production performance of the sample was also remarkable and the hydrogen generation rate reached 173.41 μmol·h −1 ·cm −2 . The active species and photocatalytic mechanism of pollutant degradation and hydrogen generation were proposed based on the photoelectrochemical data. The excellent photocatalytic performances of Bi/Bi 2 MoO 6 /TiO 2 NTs will exhibit prospective guidance for the preparation and photocatalytic water splitting of bismuth-based photocatalysts.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Jingju Cai,Minghua Zhou,Xin Xu,Xuedong Du
Anode materials are crucial to anodic oxidation for wastewater treatment. In this regard, stable boron and cobalt co-doped TiO 2 nanotube (B, Co-TNT) was prepared for the first time, and its lifetime was found increased significantly while electrocatalytic activity decreased with the increase of Co(NO 3 ) 2 in preparation from 1 to 10 mM. Characterized by scanning electron microscope (SEM), X-Ray Diffraction (XRD) and X-ray Photo-electronic Spectroscopy (XPS), B and Co content were optimized and successfully doped on TNT, which was more smooth without ripple with Co content of 0.038 mg/cm 2 in a valence of +2, and B atomic content of 2.17 at.% in form of Ti-B-O. This optimized anode enhanced electrode lifetime 122.8 times while the electrochemical activity decreased slightly when compared to the undoped TNT. The effects of current density, initial pH and initial 2,4-dichlorophenoxyacetic acid (2,4-D) concentration were investigated, and the mainly responsible radical for degradation was confirmed to be the surface OH on B, Co-TNT anode. This anode had better performance on the TOC removal, mineralization current density (MCE) and energy consumption (Ec) when compared with BDD, PbO 2 , DSA and Pt anodes, and it also presented a very stable degradation for 10 cycles oxidation of 20 mg/L 2,4-D with allowable Co leaching. Therefore, B, Co-TNT anode is a promising, stable, safety and cost-effective anode for application in electrochemical advanced oxidation processes (EAOPs).
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Soft Matter
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2020
·Vol. 16
·期 26
·6082-6090
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IF 3.14
Pengzhao Xu,Shifang Duan,Zuyao Xiao,Zhou Yang,Wei Wang
The emerging field of active matter, and its subset active colloid, is in great need of good model systems consisting of moving entities that are uniform and highly tunable. In this article, we address this challenge by introducing core–shell SiO2–TiO2 microspheres, prepared by chemically coating a thin layer of TiO2 on an inert core, that are highly monodisperse in size (polydispersity 4.1%) and regular in shape (circularity 0.93). Compared with similar samples prepared by the classic sol–gel method, Janus TiO2–Pt active colloids prepared with core–shell TiO2 spheres move faster and boast a much clearer Janus interface. Moreover, a unique feature of these core–shell TiO2 microspheres is their great tunability in the colloid size, shell thickness, and even the type of the core particle. These advantages are highlighted in two examples, one demonstrating a TiO2–Pt active colloid with a magnetic core that enables magnetic manipulation, and the other demonstrating the collective expansion and contraction of a uniform cluster of core–shell TiO2 colloids under UV light illumination. We believe that TiO2 microspheres produced by this core–shell technique compare favorably with many other types of active colloids being employed as model systems, and thus open up many research possibilities.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2020
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IF 3.306
Sarenqiqige Bao,Haiou Liang,Chunping Li,Jie Bai
A high-efficiency BiOCl/TiO 2 heterostructure hollow-tube (BTHTs) with type-II was successfully synthesized by simple electrospinning technology and solvothermal process loaded with BiOCl nanosheets on TiO 2 hollow-tubes (THTs). The results of morphology show that, the surface of THTs was covered by flaky BiOCl like pieces of flower. Optical and photo-electrochemical characterizations show that the composite catalyst has visible light absorption and high photo-generated electron-hole separation ability. Comparing with THTs and powder BiOCl, the BTHTs composites exhibited highest adsorption capacity and photocatalytic activity in the photodegradation of Tetracycline (TC), in visible light (λ ≥ 420 nm). The composites could also degrade Chlortetracycline, Demeclocycline, Doxycycline and Oxytetracycline efficaciously. Additionally, trapping experiments were carried out, and the possible photocatalytic degradation mechanism was proposed.
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ANALYTICAL CHEMISTRY
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2020
·
IF 6.785
Yang Si,Ai-Yong Zhang,Chang Liu,Dan-Ni Pei,Han-Qing Yu
Photochemical oxidation is able to effectively regenerate the fouled electrode in electrochemical pollutant monitoring, while its regeneration capacity is limited by the surface-bound hydroxyl radical speciation with low activity and mobility, which is attributed to the dissociated water adsorption on hydrophilic metal oxides. In this work, fluorine-terminated {001}-exposed TiO2 single crystals (F–TiO2) are rationally designed to construct an Au-based electrochemical sensor (Au/F–TiO2) for dopamine (DA) detection in different matrices. The Au/F–TiO2 sensor exhibits an efficient and stable detection capacity in both environmental and biological samples. A superior photochemical regeneration capacity is obtained on the Au/F–TiO2 electrode with much reduced matrix effects under UV irradiation. Spectral observation, crystallographic analysis, pollutant degradation performance, radical inhibition, and surface enhanced Raman scattering tests reveal that both the fluorine-terminated surface chemical features and the bulk-free radical speciation are mainly responsible for the superior photochemical regeneration capacity of the Au/F–TiO2 electrode. Even for the real biological samples, a stable electrochemical DA detection is also achieved on the Au/F–TiO2 sensor. Our work establishes a new approach to refine electrochemical sensors for stable monitoring and provides a robust photoactive electrode substrate with high efficiency and low cost for practical applications.
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CERAMICS INTERNATIONAL
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2020
·
IF 3.83
Zhenyu Tan,Kaixin Song,Hadi Barzegar Bafrooei,Bing Liu,Jun Wu,Junming Xu,Huixing Lin,Dawei Wang
In this paper, thermal stable Y 3 MgAl 3 SibO 12 -TiO 2 microwave composite ceramics were firstly fabricated by the high temperature solid phase reaction method. The influence of the sintering temperature , microstructure on microwave dielectric properties of Y 3 MgAl 3 SiO 12 by doping TiO 2 were investigated in detailed. TiO 2 addition reduced the ceramic sintering temperature and improved the distribution of grain size. The negative temperature coefficient of resonant frequency (τ f = −32 ppm/°C) of Y 3 MgAl 3 SiO 12 was adjusted to near zero value. 0.8Y 3 MgAl 3 SiO 12 -0.2TiO 2 ceramic sintered at 1475 °C for 6 h achieved the optimized microwave dielectric properties: ε r = 12.2, Q × f = 21,050 GHz, τ f = +5.2 ppm/°C, which indicated that 0.8Y 3 MgAl 3 SiO 12 -0.2TiO 2 is a potential candidate for dielectric patch antenna and substrate.
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MOLECULES
·
2020
·Vol. 25
·期 5
·1199
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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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Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-16
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IF 12.264
Deng Baiwen,Xiang Zhen,Xiong Juan,Liu Zhicheng,Yu Lunzhou,Lu Wei
Sandwich-like laminated Fe&TiO 2 @C nanocomposites were successfully prepared from the MXene–MOFs hybrids.
A broad effective bandwidth of 6.5 GHz at a thickness of only 1.6 mm was achieved.
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