Advanced Materials Interfaces
·
2022
·Vol. 9
·期 9
·2102001
·
IF 6.389
Jianlin Zhou,Han Liu,Yangyi Sun,Kunlin Chen
The study reports the successful fabrication of a novel dual self-healing anticorrosion coating based on benzotriazole loaded TiO 2 nanocapsule (BTC) modified graphene oxide sheets and the multibranched waterborne polyurethane (WPU). When corrosion occurs, the benzotriazole (BZT) in nanocapsules can be slowly released from the coating forming a passivation layer on the metal surface to isolate the corrosive mediums. The anticorrosion performance of coating is examined by performing electrochemical tests. As indicated from the results, after being immersed in 3.5 wt% NaCl for 7 d, the prepared coating shows excellent anticorrosion performance with inhibition efficiency of 99%. In addition, the φ in 10 4 Hz increases from 10° to 30°, and Log| Z | 0.01Hz remains at nearly 4.5 with the immersing time extended to 30 d. Moreover, when the coating is physically damaged, the damaged coating can be self-repaired by the reversible disulfide bonds in WPU and the releasing of the BZT simultaneously. Compared with other control anticorrosion coatings, the healed coating achieves significantly improved anticorrosion performance, and the damaged coating can still sustain the original anticorrosion performance after self-healing. This study proposes a novel fabrication strategy for self-healing materials, and it can contribute to the long-term use of anticorrosion coatings.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Rui Li,Huanyu Zhang,Rongxia Chai,Mei Zhang,Min Guo
Well oriented TiO 2 nanorod arrays (TNRAs), served as an electron transmission carrier, have become the hotspot in perovskite solar cells (PSCs) for providing the direct channel for efficient charge transport and facilitating the pore filling of perovskite . However, the interfacial contact between perovskite film and TNRAs is one of the main factors that restricts the power conversion efficiency (PCE) of TNRAs based PSCs at present. In this paper, by employing a two-step spin-coating method, the influence of PbI 2 solvent such as PbI 2 /DMSO + ACN and PbI 2 /DMSO + DMF + HAc solutions, on the preparation and performance of TNRAs based PSCs was intensively investigated. More importantly, the relationship between the micro-characteristics of perovskite film, especially the interfacial contact between perovskite film and TNRAs, and macro-properties of PSCs was elucidated. Experimental results indicate that two compact perovskite films with similar large grain size were synthesized on TNRAs from the two different PbI 2 solvents, which leads to similar short circuit current densities ( J sc ). However, the PSC from PbI 2 /DMSO + DMF + HAc solution shows a larger V oc of 1.10 V compared with that from PbI 2 /DMSO + ACN solution, and thus a higher PCE of 16.57% was achieved under natural ambient conditions. The key reasons for the enhanced performance may be ascribed to the faster electron extraction and larger electron recombination resistance in the PSC, which mainly depends on the nature of perovskite/TNRAs interfaces.
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JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Dun Fu,Yujia Huang,Xueting Zhang,Tonni Agustiono Kurniawan,Tong Ouyang
This study investigates the impacts of hydrogen peroxide (H 2 O 2 ) addition on the removal of tetracycline (TC) from aqueous solution by TiO 2 (B) nanosheets (NSs) and compares the changes of its characteristics due to adsorption treatment. The morphology and textural properties of the TiO 2 (B) NSs structure before and after the treatment were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Effects of pertinent parameters such as dose of TiO 2 (B) and/or H 2 O 2 concentration, initial adsorbate concentration, pH, and temperature on the TC adsorption by TiO 2 (B) NSs were examined. The adsorption mechanisms of TC by the integrated treatment of TiO 2 (B) NSs and H 2 O 2 are also presented. The results demonstrated that the integrated treatment of TiO 2 (B)-H 2 O 2 system had significantly improved the TC removal by 250% (with its adsorption capacity ( q max ) of 212.77 mg g − 1 ), as compared to that of the TiO 2 -H 2 O 2 system (paired t-test ; p ≤ 0.05) under the same optimum conditions (2 g L − 1 of TiO 2 (B) NSs; 20 mM of H 2 O 2 ; 0.1 g L − 1 of initial TC concentration). The enhanced TC adsorption by the integrated TiO 2 (B)-H 2 O 2 system not only is due to the H-bonding between the TC molecules and the –OOH groups formed on TiO 2 (B) surface, but it is also because of electrostatic interactions. Their adsorption isotherms followed the Elovich model and were also applicable to both the Langmuir and the Freundlich models. In spite of the adsorbent's promising performance, its treated effluents still could not meet the required TC effluent limit of < 62.5 μg L − 1 . This suggests that further subsequent treatment like biological processes is still necessary to completely remove the target pollutant from the wastewater samples.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Huaide Jiang,Xiaoli He,Yanmei Ma,Bi Fu,Xingui Xu,Balachandran Subramanian,Chengzhi Hu
Directional motion in response to specific signals is critically important for micro/nanomotors in precise cargo transport, obstacle avoidance, collective control, and complex maneuvers. In this work, a kind of isotropic light-driven micromotor that is made of hedgehog-shaped TiO2 and functional multiwall carbon nanotubes (Hs-TiO2@FCNTs) has been developed. The FCNTs are closely entangled with Hs-TiO2 and form a close-knit matrix on the surface of Hs-TiO2, which facilitates the transfer of electrons from Hs-TiO2 to FCNTs. Due to the high redox potential of Hs-TiO2, excellent electron–hole separation efficiency by the addition of FCNTs, and isotropic morphology of the micromotor, these Hs-TiO2@FCNT micromotors show phototactic and fuel-free propulsion under unidirectional irradiation of UV light. It is the first time to demonstrate isotropic micromotors that are propelled by self-electrophoresis. The isotropy of Hs-TiO2@FCNT micromotors makes them immune to the rotational Brownian diffusion and local flows, exhibiting superior directionality. The motion direction of our micromotors can be precisely tuned by light and a velocity of 8.9 μm/s is achieved under 160 mW/cm2 UV light illumination. Photodegradation of methylene blue and active transportation of polystyrene beads are demonstrated for a proof-of-concept application of our micromotors. The isotropic design of the Hs-TiO2@FCNT micromotors with enhanced photocatalytic properties unfolds a new paradigm for addressing the limitations of directionality control and chemical fuels in the current asymmetric light-driven micromotors.
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高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Chunquan Li,Zhiming Sun,Xiongbo Dong,Shuilin Zheng,Dionysios D. Dionysiou
In this study, sol-gel method modified with acetic acid (CH 3 COOH) was employed to facilely synthesize hydrogen functionalized TiO 2 /kaolinite composite. Weak acid (CH 3 COOH) was used to modify the surface of TiO 2 /kaolinite composite in order to activate TiO 2 surface and generate more hydroxyl groups. The modified surface can act as Lewis acid sites to allow the physisorption of uncharged carboxyl acid groups, which is believed to be beneficial for electron injection and transfer. Using ciprofloxacin (CIP) as the target pollutant, in comparison with the use of strong acid such as hydrochloric acid (HCl) or sulfuric acid (H 2 SO 4 ), it was found that CH 3 COOH functionalized TiO 2 /kaolinite composite possessed the strongest adsorption ability and exhibited highest degradation efficiency under broad spectrum (200–800 nm). Moreover, the concentration of CH 3 COOH required is low (0.1 mol/L) in this work. The results show that the CH 3 COOH treated sample exhibited much higher degradation rates than bare TiO 2 or TiO 2 /kaolinite composite under both UV light and visible light. The kinetic constants under UV light were almost 2.61 and 1.57 times higher than those of TiO 2 and TiO 2 /kaolinite, respectively. According to the X-ray diffraction (XRD), N 2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), Fourier Transform infrared spectroscopy (FTIR) as well as Raman characterization results, it is revealed that the improved photocatalytic activity can be mainly attributed to the CH 3 COOH functionalization towards the TiO 2 /kaolinite composite. Furthermore, density functional theory (DFT) calculations were employed to explore the interface effect between TiO 2 and kaolinite as well as the function of newly introduced hydrogen on the surface of the composite, which significantly contributes to better understanding the function of CH 3 COOH in the constructed system. On the other hand, electron spin resonance (ESR) analysis suggests that the main oxidation species in the degradation process under broad light spectrum illumination was the holes. This study also provides information about the enhancement mechanism. New insights in photocatalysts synthesis and properties adjustment based on natural minerals for the elimination of organic contaminants of emerging concern in water was successfully introduced in the present study.
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高影响因子
RSC Advances
·
2022
·Vol. 12
·期 19
·12219-12225
·
IF 4.036
Yang Song,Yuchong Kang,Wei Ma,Haibo Li
Herein, a facile one-step method is developed to in situ prepare crystalline anatase and rutile TiO2 nanocrystals on Ti3C2Tx by regulating the metastable Ti ions. The combination of TiO2 nanocrystals and Ti3C2Tx not only introduces extensive accessible sites for Na+ storage, but also promotes the charge transport by efficiently relieving the collapse of Ti3C2Tx. Compared with pristine Ti3C2Tx, the optimized TiO2/Ti3C2Tx hybrid electrode (anatase/rutile-TiO2/Ti3C2Tx, A/R-TiO2/Ti3C2Tx) exhibits a desirable specific surface area (22.5 m2 g−1), an ultralow charge transfer resistance (42.46 Ω) and excellent ion diffusion (4.01 × 10−14). Remarkably, rich oxygen vacancies are produced on TiO2/Ti3C2Tx which is beneficial to enhance the insertion/de-insertion of Na+ during the charge/discharge process. As a result, the A/R-TiO2/Ti3C2Tx delivers a high average capacity of 205.4 mA h g−1 at 100 mA g−1 and a desirable capacitance retention rate of 84.7% can be achieved after 600 cycles at 500 mA g−1.
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高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 160
·期 16
·
IF 3.1
Du Luchao,An Jie,Katayama Tetsuro,Duan Menghan,Shi XiaoPing,Wang Yunpeng,Furube Akihiro
In recent years, all-inorganic perovskite materials have become an ideal choice for new thin film solar cells due to their excellent photophysical properties and have become a research hotspot. Studying the ultrafast dynamics of photo-generated carriers is of great significance for further improving the performance of such devices. In this work, we focus on the transient dynamic process of CsPbBr 3 /TiO 2 composite systems with different Mn 2+ doping contents using femtosecond transient absorption spectroscopy technology. We used singular value decomposition and global fitting to analyze the transient absorption spectra and obtained three components, which are classified as hot carrier cooling, charge transfer, and charge recombination processes, respectively. We found that the doping concentration of Mn 2+ has an impact on all three processes. We think that the following two factors are responsible: one is the density of defect states and the other is the bandgap width of perovskite. As the concentration of doped Mn 2+ increases, the charge transfer time constant shows a trend of initially increasing, followed by a subsequent decrease, reaching a turning point. This indicates that an appropriate amount of Mn 2+ doping can effectively improve the photoelectric performance of solar cell systems. We proposed a possible charge transfer mechanism model and further elucidated the microscopic mechanism of the effect of Mn 2+ doping on the interface charge transfer process of the CsPbBr 3 /TiO 2 solar cell system.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Yamei Li,Shidong Ji,Yanfeng Gao,Hongjie Luo,Ping Jin
Vanadium dioxide (VO2) is a key material for thermochromic smart windows that can respond to environmental temperature and modulate near-infrared irradiation by changing from a transparent state at low temperature to a more reflective state at high temperature, while maintaining visible transmittance. Here, we demonstrate for the first time that the Mott phase transition characteristics in VO2 nanoparticles can be remarkably modified by misfit strains occurring at the epitaxial interface between VO2 and the anatase TiO2 of VO2/TiO2 core–shell particles. The heteroepitaxial growth of the as-synthesized particles followed an unprecedented orientation relationship, and an epitaxial growth mechanism is proposed to explain this behavior. A relatively small theoretical coherent misfit (3–11%) and a moderate heating rate (20 °C·min–1) in the preparation of the core–shell structure were critically important from the thermodynamic and kinetic perspectives, respectively. The misfit-induced interfacial strain along the uniaxial cR axis increased the transition temperatures, especially on the cooling portion of the heating–cooling cycle, leading to a notably reduced transition hysteresis loop width (from 23.5 to 12.0 °C). Moreover, the optical band gap was also engineered by the interfacial effect. Such a reduced hysteresis showed a benefit for enhancing a rapid response for energy saving thermochromic smart windows.
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高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Lei Chen,Zhichun Si,Xiaodong Wu,Duan Weng
A CuO–CeO2–TiO2 catalyst for selective catalytic reduction of NOx with NH3 (NH3-SCR) at low temperatures was prepared by a sol–gel method and characterized by X-ray diffraction, Brunner–Emmett–Teller surface area, ultraviolet–visible spectroscopy, H2 temperature-programmed reduction, scanning electron microscopy and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). The CuO–CeO2–TiO2 ternary oxide catalyst shows excellent NH3-SCR activity in a low-temperature range of 150–250 °C. Lewis acid sites generated from Cu2+ are the main active sites for ammonia activation at low temperature, which is crucial for low temperature NH3-SCR activity. The introduction of ceria results in increased reducibility of CuO species and strong interactions between CuO particles with the matrix. The interactions between copper, cerium and titanium oxides lead to high dispersion of metal oxides with increased active oxygen and enhanced catalyst acidity. Homogeneously mixed metal oxides facilitate the “fast SCR” reaction among Cu2+–NO, nitrate (coordinated on cerium sites) and ammonia (on titanium sites) on the CuO–CeO2–TiO2 catalyst at low temperatures.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xiaoting Hong,Yumei Zhou,Zhuoliang Ye,Haifeng Zhuang,Wanpeng Liu,K.S. Hui,Zhi Zeng,Xianhuan Qiu
Ag 3 PO 4 /TiO 2 nanocomposite was fabricated by an in situ precipitation method and then blended into poly(vinylidene fluoride) (PVDF) casting solution to prepare the ultrafiltration membrane via wet phase inversion technique. The water flux and bovine serum albumin (BSA) rejection rate of membrane were investigated; meanwhile, the ultrafiltration membrane morphologies and structural properties were analyzed using scanning electron microscope (SEM) and X-ray diffraction. Compared with the control membrane, the permeate performance of blended membranes was improved while possessing a steady BSA retention due to enhanced hydrophilicity. Mechanical tests revealed that the modified membranes exhibited a larger tensile strength and breakage elongation. SEM images and the halo zone testing were employed to assess the antibacterial performances of the nanocomposite membranes against Escherichia coli. The antibacterial tests confirmed that the modified membranes showed an effective antibacterial property against E. coli.
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高影响因子
LANGMUIR
·
2024
·
IF 3.7
Pai Peng,Jie Ren,Shuxiang Wang,Jing Huang,Li Zou,Pingping Yang,Xiangui Pang,Ming Zhang,Youyi Su,Wanqi Luo,Wenyan Tao,Jiale Xie
The severe photocorrosion of cadmium sulfide (CdS) restricts its practical application for solar hydrogen production. Although remarkable progress has been achieved with an overlayer strategy for isolating the CdS surface, the lifetime of CdS-based photoanodes is still far from the actual requirements. Herein, a hybrid overlayer of defective Ni-MOF and NiO nanoparticles has been developed through the chemical bath deposition method with postannealing. This hybrid overlayer of Ni-MOF-d is coated on the surface of the TiO2/CdS type-II heterojunction. The composite photoanode exhibits a photocurrent density of 4.41 mA cm–2 at 1.23 VRHE, which is 3.47- and 1.32-fold that of CdS and TiO2/CdS, respectively. The Ni-MOF-d overlayer gives rise to a negative shift of the onset potential by 59.51 mV. After a long-term stability test of 11 h, a photocurrent retention of 70% is observed, which is among the most robust CdS-based photoanodes. The kinetics studies reveal that the performance improvements can be attributed to the multiple functions of the Ni-MOF-d hybrid overlayer, including isolating the CdS surface from the electrolyte, cocatalyzing the electrode oxidation processes, passivating the surface defect states of CdS, and facilitating the charge injection from the photoanode to the electrolyte.
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高影响因子
Catalysts
·
2019
·Vol. 9
·期 5
·407
·
IF 3.444
Bin Yang,Guoqiang Chen,Huiwen Tian,Lei Wen
In this study, oxygen vacancy modified TiO2nanorod array photoelectrode was prepared by reducing hydrogen atmosphere to increase its free charge carrier density. Subsequently, a p-type conductive poly 3,4-ethylenedioxythiophene (PEDOT) layer was deposited on the surface of oxygen vacancy modified TiO2, to inhibit the surface states. Meanwhile, a p-n heterojunction formed between PEDOT and TiO2to improve the separation of photo-induced carriers further. The photocurrent of TiO2nanorod array increased to nearly 0.9 mA/cm2after the co-modification under standard sunlight illumination, whose value is nearly nine times higher than that of pure TiO2nanorod array. Thus, this is a promising modification method for TiO2photoanode photoelectrochemical (PEC) performance improving.
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高影响因子
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