JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 8
·4601-4609
·
IF 1.774
Zhang Xinxin,Zhang Jiejing,Su Pengyu,Feng Shuang,Xu Ri,Bian Chang,Fu Wuyou,Yang Haibin,Li Zhihui
Interfacial modification plays a vital role in boosting the performance of planar perovskite solar cells (PSCs). Here, perovskite-type BaTiO 3 nanocrystals prepared by immersing dense blocking TiO 2 (bl-TiO 2 ) in Ba(NO 3 ) 2 solution were used as an interfacial modifier. The interface bonding was improved due to the fact that BaTiO 3 and CH 3 NH 3 PbI 3 (MAPbI 3 ) have the same structure. Incorporation of BaTiO 3 nanocrystals effectively boosted the electron extraction rate and suppressed the carrier recombination at the interface. The MAPbI 3 grains nucleated and grew rapidly, resulting in larger grain size after introduction of BaTiO 3 nanocrystals. Photoluminescence (PL) spectroscopy, time-resolved PL decay spectroscopy, and electrochemical impedance spectroscopy measurements verified that the BaTiO 3 nanocrystals indeed promoted the carrier separation rate while suppressing nonradiative carrier recombination. By optimizing the bl-TiO 2 /MAPbI 3 interface, the power conversion efficiency of planar PSCs based on bl-TiO 2 /BaTiO 3 was improved from 15.03% to 17.71% [ J sc = 22.49 mA/cm 2 , V oc = 1.12 V, fill factor (FF) = 70%].
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International Journal of Refrigeration
·
2021
·
IF 3.629
Zhenghao Jin,Shuhong Li,Runfa Zhou,Mengkai Xu,Weixue Jiang,Kai Du
The newly NH 3 – H 2 O – LiBr working fluid can decrease the power wasted in the generator, thus improves the COP of the ammonia absorption refrigeration system. But the applying of NH 3 – H 2 O – LiBr working fluid decreases the ammonia absorption efficiency, so the COP of the system is still unsatisfactory. To further enhance the COP of the NH 3 – H 2 O - LiBr absorption refrigeration system, TiO 2 nanoparticles are added to the NH 3 – H 2 O - LiBr working fluid in this study. And the effects of TiO 2 nanoparticles concentration on the performances of the generator, absorber, evaporator, condenser, and solution heat exchanger are tested in an ARS experimental system. The experimental results indicate that the addition of TiO 2 nanoparticles increases the P g , P e , P a , and P c , meaning that the value of ammonia produced in the generator increases. Therefore, the COP and iCOP of the system are improved by adding TiO 2 nanoparticles, and the COP is maximum improved by 18.96% compared with the ammonia-water absorption refrigeration system. When the x TiO2 is increased from 0.3% to 0.5%, the increase rate of the COP decreases because the newly added nanoparticles do not disperse well. So 0.3% is a better choice for the TiO 2 nanoparticles concentration when comprehensively considering the dispersion stability of nanoparticles and the COP.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Maosong Liu,Xin Jin,Shun Li,Jean-Baptiste Billeau,Tingyu Peng,Henan Li,Long Zhao,Zuotai Zhang,Jerome P. Claverie,Luca Razzari,Jianming Zhang
Recently, localized surface plasmon resonances (SPRs) of metallic nanoparticles (NPs) have been widely used to construct plasmonic nanohybrids for heterogeneous photocatalysis. For example, the combination of plasmonic Au NPs and TiO2 provides pure TiO2 visible-light activity. The SPR effect induces an electric field and consequently enhances light scattering and absorption, favoring the transfer of photon energy to hot carriers for catalytic reactions. Numerous approaches have been dedicated to the improvement of SPR absorption in photocatalysts. Here, we have designed a core@shell–satellite nanohybrid catalyst whereby an Ag NP core, as a plasmonic resonator featuring unique dual functions of strong scattering and near-field enhancement, is encapsulated by SiO2 and TiO2 layers in sequence, with Au NPs on the outer surface, Ag@SiO2@TiO2–Au, for efficient plasmonic photocatalysis. By varying the size and number of Ag NP cores, the Au SPR can be tailored over the visible and near-infrared spectral region to reabsorb the scattered photons. In the presence of the Ag core, the incident light is efficiently confined in the reaction suspension by undergoing multiple scattering, thus leading to an increase of the optical path to the photocatalysis. Moreover, using numerical analysis and experimental verifications, we demonstrate that the Ag core also induces a strong near-field enhancement at the Au–TiO2 interface via SPR coupling with Au. Consequently, the activity of the TiO2–Au plasmonic photocatalyst is significantly enhanced, resulting in a high H2 production rate under visible light. Thus, the design of a single structural unit with strong scattering and field enhancement, induced by a plasmonic resonator, is a highly effective strategy to boost photocatalytic activity.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2021
·Vol. 36
·期 2
·183-188
·
IF 0.957
Zuo Jiaxiang,Jin Xin,Zeng Hui
Fresh EPF proteins from Liangzi Lake were employed as a template to synthesize hierarchically porous nitrogen-doped TiO 2 in a single process. The experimental results show that N-TiO 2 sample exhibits significantly enhanced visible-light photocatalytic activity in both chemical waste treatment and hydrogen production, and the visible-light photocatalytic activities vary with the concentrations of EPF proteins. The optimal concentration of protein is 600 mg·mL −1 and the degradation of RhB could be almost completed in just 25 min. Furthermore, the performance of as-synthesized TiO 2 as an electrode for Li-ion battery can be also regulated by the EPF proteins. Natural extrapallial fluid (EPF) proteins extracted from the same kind of mussels living in different regions have significantly different effects on the performances of TiO 2 as electrode materials for Li-ion battery. The present work highlights the unimaginable effects of natural organic matrix on the synthesis of advanced materials with optimized functional properties.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 20
·24845-24855
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IF 2.478
Chen Peiran
Herein, the mechanically exfoliated ultrathin g-C 3 N 4 nanosheets (NSs) are used to decorate TiO 2 hollow microspheres to obtain composite core–shell photocatalysts. The composite hollow microspheres are analyzed through PXRD, Raman spectroscopy, N 2 adsorption–desorption measurements, SEM, TEM, HRTEM, XPS, UV–Vis diffuse reflectance spectra, UPS measurements, PL spectra, photocurrent curves, and EIS spectra. The obtained results show that the composite microspheres have improved visible-light response and boosted carrier separation. Furthermore, the synthesized samples have excellent photodegradation performance for the antibiotic tetracycline and rhodamine B (RhB) under visible light, and the corresponding photodegradation rates are 94.5 and 96.5% at 60 min. In addition, the synthesized catalysts also maintain excellent stability in multiple cycles of experiments. Based on the experimental results, a possible photodegradation pathway on composite microspheres has also been proposed.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Lingling Cui,Hang Li,Jiewen Huang,Dangsheng Xiong
To improve the biotribological properties of Ti6Al4V alloy for artificial joints, motivated by the composite structure of ‘natural articular cartilage - subchondral bone’ and the hydration lubrication mechanism of articular cartilage, a soft/hard bilayer coating composed of a porous TiO 2 layer and a zwitterionic hydrogel coating was designed and fabricated on Ti6Al4V alloy through micro-arc oxidation (MAO) combined with ultraviolet (UV) radiation technology. Characterization results revealed that the bio-inspired bilayer coating could be successfully constructed on Ti6Al4V alloy, and such a coating displayed good hydrophilicity (WCA: 32°). Notably, by ball - on - disk friction test, this biomimetic bilayer coating exhibited an ultra-low friction coefficient (∼0.038) in PBS solution, which was reduced by an order of magnitude compared with that of the Ti6Al4V alloy substrate. This was due to the synergistic effects of soft/hard composite structure and the hydration lubrication of zwitterionic MPC polymer. This work provides a novel and effective strategy for surface modification of Ti6Al4V alloy for artificial joints.
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FIBERS AND POLYMERS
·
2021
·Vol. 23
·期 2
·386-395
·
IF 2.153
Xu Qingbo,Wang Peng,Zhang Yanyan,Li Changlong
k]Immobilizing inorganic particles such as zinc oxide (ZnO), titanium dioxide (TiO 2 ), silver nanoparticles (Ag NPs) or grafting special biopolymer such as chitosan on cotton fabrics is the main method to prepare antibacterial and ultraviolet (UV) protective cotton fabrics. However, poor durability and complex finishing methods are still of the main defects of antibacterial and UV protective fabric samples. In the present work, the Ag/TiO 2 colloid solution was prepared with using the carboxymethyl chitosan (CMC) as a stabilizer, then the CMC and Ag/TiO 2 composite nanoparticles were coated on the fabric via finishing technology of pad-dry-cure. As a result, the modified fabric showed excellent antibacterial and UV protective properties, with the values of bacterial reduction (BR) and ultraviolet protection factor were reached at 99.5 % and 79.0, respectively. Moreover, even after 50 washing cycles, these properties of the finished fabrics were not obviously reduced. These results demonstrated that the finished fabric sample has durable antibacterial and UV protective properties which could has a great potential application in the field of medical and outdoor apparel.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Marimuthu Karpuraranjith,Yuanfu Chen,Sivamoorthy Rajaboopathi,Manigandan Ramadoss,Katam Srinivas,Dongxu Yang,Bin Wang
Herein, a simple, highly efficient and stable MoS 2 nanobox embedded graphitic-C 3 N 4 @TiO 2 (g-CN@TiO 2 ) nanoarchitecture was synthesized by a facile solvothermal approach. The nano-hybrid photocatalyst was constructed by TiO 2 nanoparticles anchored on the surface of g-CN nanosheets. Then highly crystalline three-dimensional porous MoS 2 nanobox was homogeneously distributed on the g-CN@TiO 2 surface. The g-CN@TiO 2 /MoS 2 hybrid achieved a high photocatalytic degradation efficiency of 97.5% for methylene blue (MB) dye pollutant under visible-light irradiant in an hour which was much better than TiO 2 @MoS 2, g-CN@TiO 2, MoS 2, TiO 2 and g-CN. Furthermore, the reaction rate ( k) value of g-CN@TiO 2 /MoS 2 for MB dye is as high as 3.18 X 10 -2 min −1 , which is ~ 2.65 times better than those of g-CN@TiO 2 and MoS 2 . This work presents a rational structure design, interfacial construction and suitable band gap strategy to synthesize advanced nano-hybrid photocatalyst for degradation of organic pollutant with excellent performance and long-term stability.
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Materials
·
2021
·Vol. 14
·期 14
·3816
·
IF 3.623
Xiaojie Li,Xin Li,Pei Zuo,Xiaozhe Chen,Misheng Liang,Le Ma
TiO2is popular in photocatalytic degradation dye pollutants due to its abundance and its stability under photochemical conditions. Au loaded TiO2can achieve efficient absorption of visible light and deal with the problem of low conversion efficiency for solar energy of TiO2. This work presents a new strategy to prepare Au nanoparticles-loaded TiO2composites through electric−field−assisted temporally−shaped femtosecond laser liquid-phase ablation of Au3+and amorphous TiO2. By adjusting the laser pulse delay and electric field parameters, gold nanoparticles with different structures can be obtained, such as nanospheres, nanoclusters, and nanostars (AuNSs). AuNSs can promote the local crystallization of amorphous TiO2in the preparation process and higher free electron density can also be excited to work together with the mixed crystalline phase, hindering the recombination between carriers and holes to achieve efficient photocatalytic degradation. The methylene blue can be effectively degraded by 86% within 30 min, and much higher than the 10% of Au nanoparticles loaded amorphous TiO2. Moreover, the present study reveals the crystallization process and control methods for preparing nanoparticles by laser liquid ablation, providing a green and effective new method for the preparation of high-efficiency photocatalytic materials.Keywords:electric-field-assisted;femtosecond laser;Au@TiO2composites;photocatalytic degradation
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RSC Advances
·
2021
·Vol. 11
·期 39
·24144-24155
·
IF 3.361
Xingdong Yang,Jiyan Qu,Linxi Wang,Jianhong Luo
In an attempt to realize the efficient treatment of NOx, a mixed catalyst of Ti3+ self-doped TiO2−x and γ-Al2O3 was constructed by reducing commercial TiO2. The degradation effect on NOx was evaluated by introducing the mixed catalyst into a coaxial dual-dielectric barrier reactor. It was found that the synthesized TiO2−x could achieve considerable degradation effects (84.84%, SIE = 401.27 J L−1) in a plasma catalytic system under oxygen-rich conditions, which were better than those of TiO2 (73.99%) or a single plasma degradation process (26.00%). The presence of Ti3+ and oxygen vacancies in TiO2−x resulted in a relatively narrow band gap, which contributed to catalyzing deeply the oxidation of NOx to NO2− and NO3− during the plasma-induced “pseudo-photocatalysis” process. Meanwhile, the TiO2−x showed an improved discharge current and promoted discharge efficiency, explaining its significant activation effect in the reaction. Reduced TiO2−x could achieve an impressive degradation effect in a long-time plasma-catalysis process, and still maintained its intrinsic crystal structure and morphology. This work provides a facile synthesis procedure for preparing Ti3+ self-doped TiO2−x with practical and scalable production potential; moreover, the novel combination with plasma also provides new insights into the low-temperature degradation of NOx.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 49
·495605
·
IF 3.874
Qiushi Jiang,Zhaolian Han,Yafeng Yuan,Zhiqiang Cheng
By means of electrospinning combined with impregnation and calcination, the thin-walled TiO2 nano-burst tubes with Fe2O3 nanograss on the surface were synthesized. The effects of precursor properties and concentration on the morphology, structure and photochemical properties of the prepared nanostructures were studied. Adding K3[Fe(C2O4)3]·3H2O into the electrospinning solution as the precursor can not only realize the preparation of nanograss and thin-walled nano-burst tubes, but also achieve better degradation effect than that of FeCl3. However, the composite prepared by adding 2% K3[Fe(C2O4)3]·3H2O has the best synergistic effect, showing the best photoresponse performance and catalytic efficiency, and achieving the degradation of 94% levofloxacin within 90 min. In this study, a simple and economical synthesis strategy was proposed, that is, TiO2/Fe2O3 heterostructure with special structure was prepared by introducing a small amount of acid or metallic acid salts into the precursor as a high-performance photocatalyst.
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ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 30
·期 5
·1908309
·
IF 15.621
Sainan Luo,Tao Yuan,Luke Soule,Jiafeng Ruan,Yahui Zhao,Dalin Sun,Junhe Yang,Meilin Liu,Shiyou Zheng
Ion-insertion capacitors show promise to bridge the gap between supercapacitors of high power densities and batteries of high energy densities. While research efforts have primarily focused on Li + -based capacitors (LICs), Na + -based capacitors (SICs) are theoretically cheaper and more sustainable. Owing to the larger size of Na + compared to Li + , finding high-rate anode materials for SICs has been challenging. Herein, an SIC anode architecture is reported consisting of TiO 2 nanoparticles anchored on a sheared-carbon nanotubes backbone (TiO 2 /SCNT). The SCNT architecture provides advantages over other carbon architectures commonly used, such as reduced graphene oxide and CNT. In a half-cell, the TiO 2 /SCNT electrode shows a capacity of 267 mAh g −1 at a 1 C charge/discharge rate and a capacity of 136 mAh g −1 at 10 C while maintaining 87% of initial capacity over 1000 cycles. When combined with activated carbon (AC) in a full cell, an energy density and power density of 54.9 Wh kg −1 and 1410 W kg −1 , respectively, are achieved while retaining a 90% capacity retention over 5000 cycles. The favorable rate capability, energy and power density, and durability of the electrode is attributed to the enhanced electronic and Na + conductivity of the TiO 2 /SCNT architecture.
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