ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Shan Fang,Laifa Shen,Guiyin Xu,Ping Nie,Jie Wang,Hui Dou,Xiaogang Zhang
A unique core–shell structure of silicon@titania (Si@TiO2) composite with silicon nanoparticles encapsulated in TiO2 hollow spheres is synthesized by a simple hydrolysis method combined with magnesiothermic reduction method. It is found that the TiO2 shell is effective for improving the electrical conductivity and structural stability. More importantly, the well-designed nanostructure with enough empty space would accommodate the volume change of silicon during the cycling. Reversible capacities of 1911.1 and 795 mAh g–1 can be obtained at 0.05 C and a high current rate of 1 C, respectively. After 100 cycles at 0.1 C, the composite electrode still maintains a high capacity of 804 mAh g–1. This excellent cycling stability and high-rate capability can be ascribed to the unique core–shell nanostructure and the synergistic effect between Si and TiO2.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Long Liu,Xinxi Li,Gen He,Guoqing Zhang,Guanji Su,Chenhui Fang
Silicon-based materials have been widely used as anode materials in lithium-ion batteries (LIBs) because of the high specific capacity. However, there exist some shortcomings, especially in the thermal stability of the batteries, as well as huge volume expansion (＞300%) causes structural cracking. Herein, a core-shell structured SiO@C/TiO 2 nanospheres has been successfully synthesized via ball milling and sol-gel method, the morphological, componential and thermal features are characterized with X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy. The results exhibit that the SiO could spontaneously absorb the huge volume expansion stress, the C/TiO 2 shell as a compact fence was utilized to effectively enhance the electrical conductivity and further control the integrity and stability of well-wrapped core-shell framework during the charge/discharge processes. The electrochemical analysis show the SiO@C/TiO 2 nanospheres possess a remarkably high initial coulomb efficiency of 97%. The reversible capacity can reach to 1565 mA h g −1 at 0.1 A g −1 after 100 cycles, which is higher than those of N–SiO (1353 mA h g −1 ) and SiO@C (1326 mA h g −1 ). Even at 2 A g −1 , it exhibit a discharge capacity of 844.6 mA h g −1 after 220 cycles. This excellent performance can be primarily attributable to the well-designed core-shell structure of SiO@C/TiO 2 nanospheres, where the outer rigid C/TiO 2 coating can not only effectively alleviate the large volume change of SiO but also maintain the stable structure of anode materials, which are considered as a promising candidate to the anode material for new generation power LIBs.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Nan Wang,Xing Li,Yanling Yang,Tingting Guo,Xiaoxuan Zhuang,Siyang Ji,Tingting Zhang,Zhiwei Zhou
A series of Bi–Ti composited photocatalysts with different molar ratio of Bi/Ti (0.01:1(1%), 0.02:1(2%), 0.04:1(4%), and 0.05:1(5%)) and calcination temperature (400°C, 500°C, and 600°C) were prepared by sol-hydrothermal method. The properties of as-prepared photocatalysts were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photo-electron spectroscopy, Brunauer–Emmett–Teller, and ultraviolet–visible diffuse reflection spectroscopy. The selected photocatalyst (Bi-Ti-4%-600°C) was prepared under Bi/Ti molar ratio of 4% and calcination temperature of 600°C. Experimental variables during photocatalytic degradation were optimized for catalyst dosage, solution pH, initial bisphenol A (BPA) concentration, coexisting anions, and light source wavelength. Under optimal conditions of 1.0 g L –1 catalyst, pH 3, 30 mg L –1 initial BPA concentration, the degradation rate of BPA could reach up to 100% at 150 min under visible light irradiation. Compared with self-made pure TiO 2 and commercially available P 25 , Bi-Ti-4%- 600°C displayed an excellent photocatalytic activity for BPA degradation. Bi-Ti photocatalyst had a smaller crystal size, larger specific surface area, stronger visible light absorption ability, and lower band gap energy than self-made pure TiO 2 . Four intermediates of BPA degradation were identified and a possible degradation pathway was proposed.
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高影响因子
ULTRASONICS SONOCHEMISTRY
·
2018
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IF 6.012
Yuan Yao,Mingxuan Sun,Xiaojiao Yuan,Yuanhua Zhu,Xiaojing Lin,Sambandam Anandan
N/Ti 3+ co-doping multiphasic TiO 2 /BiOBr heterojunctions (NT-TBx) were prepared by one-step in situ hydrothermal processes. The crystal phase, morphology, component, and optical properties of the heterojunctions were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy, and Ultraviolet–visible diffuse reflectance spectroscopy techniques, respectively. The as-prepared samples exhibit better sonocatalytic activity for the degradation methylene blue, Rhodamine B, and p -Nitrophenol aqueous solution compared with pristine TiO 2 and N/Ti 3+ co-doping multiphasic TiO 2 . Especially, the highest degradation ratio of methylene blue was achieved for NT-TB 0.3 up to 98.2% after 50 min under ultrasonic irradiation. The high sonocatalytic activity has been kept after four cycles with the tiny decline, indicating the excellent stability of the as-prepared samples. The improvement of sonocatalytic activity could be attributed to the formation of doping level and multiphasic TiO 2 /BiOBr heterojunctions, which account for the absorption of long wavelength light and the electron-hole pair separation, respectively. Furthermore, superoxide radical ( O 2 − ) was demonstrated to be the main reactive species for the degradation of methylene blue under ultrasonic irradiation. This study provides a facile fabrication procedure for N/Ti 3+ co-doping multiphasic TiO 2 /BiOBr heterojunctions and demonstrates an efficient route to promote the application of TiO 2 in addressing environment-related issues.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 19
·32144-32152
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IF 5.2
Qiujun Hu,Junbiao Guo,Hanyang Zuo,Haowen Chen
Due to their superior thermoelectric capabilities, Bi 2 Te 3 -based materials have long been a popular area of study in the thermoelectric field. However, further advancements in the energy conversion efficiency of Bi 2 Te 3 -based thermoelectric modules are constrained by the low figure of merit of n -type Bi 2 Te 3 . Here, we describe an efficient method for enhancing the electrical and thermal characteristics of n -type Bi 2 Te 2.7 Se 0.3 (BTS) material by dispersing TiO 2 ceramic nanoparticles (NPs) in the matrix of the BTS. In more detail, the energy potential barrier, created by the matrix and the addition of TiO 2 NPs, causes an energy filtering effect, which in turn raises the Seebeck coefficient. The lattice thermal conductivity is decreased as a result of dislocations at the TiO 2 /BTS interface and an increase in grain boundary density brought on by the fine grain strengthening of TiO 2 ceramic NPs. Last but not least, the ZT max for the BTS + 3 wt% TiO 2 sample increased to 1.31, representing an improvement of 52% over the pristine sample. Additionally, at a maximum temperature differential of 150K, we have built a thermoelectric module with a power output and energy conversion efficiency of 7.2 W and 5.9%, respectively. This study introduces a viable approach towards the rational design of advanced n -type Bi 2 Te 2.7 Se 0.3 materials.
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高影响因子
VACUUM
·
2024
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IF 3.8
Xun Zhou,Xin Yi,Zhixian Liang,Jie Zhang,Guixiang Li,Yuanliang Tang,Kun Zhou,Shaohui Zhang
In this work, the photothermal effect of aminomodified MWCNTs/TiO 2 /SiO 2 /PDMS nanocomposites was utilized as a photothermal substrate to replace the metal heating block of traditional qPCR combining of the advantages of high photothermal effect of composite materials and low sample volume of static microfluidic PCR. Meanwhile, Multiple PCR rapid thermal cycles under 808 nm laser irradiation was accomplished through a non-contact energy conversion method and the use of chamber-immobilized PCR chips as specific reaction vessels. Notably, the chip chamber architecture requires merely about 8 μL of reagents compared to traditional PCR tubes. While reducing the amount of PCR reagents used, the higher specific surface area results in a larger contact surface (SSA) between the heat source and the solution. Thereafter, the CCD image sensor is then used as a fluorescence detector to monitor the amplification of the target DNA during the PCR reaction, thus enabling simultaneous fluorescence detection. In addition, the threshold cycle (Ct) value of qPCR and standard PCR curves for SARS-CoV-2 virus have been analysed in depth. Importantly, this study has important implications for the development of low-cost materials, miniaturized and portable Point-of-Care Testing (POCT) chips/systems.
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高影响因子
Journal of Building Engineering
·
2024
·
IF 6.7
Jiaqi Zhu,Chang Chen,Xufu Wang,Shaowu Jiu,Yanxin Chen,Yan Liu
Rock wool, as an external wall insulation material, is crucial in improving the energy efficiency of structures. However, a large amount of rock wool furnace slag (RWFS) generated during the production of rock wool panels manufacturing causes environmental problems. To address these issues, this study focuses on the use of waste RWFS as a precursor in alkali-activated cementitious materials. In addition, the effect of anatase nano-TiO 2 (ANT) and rutile nano-TiO 2 (RNT) as an additive to the alkali-activated rock wool furnace slag cementitious materials (AARWFSCMs) was evaluated and quantified. Scanning Electronic Microscope (SEM), Isothermal Conduction Calorimetry (ICC), Fourier-Transform Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD) analysis were used to identify the effects of modulus 1.0–1.8 water glass modulus (Ms; SiO 2 /Na 2 O), 3%–7% Na 2 O content on AARWFSCMs. Experimental tests was conducted to quantify the properties such as the setting time, the fluidity, the compressive strength of AARWFSCMs after hardening. Results found that the optimal content of Ms, Na 2 O content in preparing AARWFSCM were 1.4, 5 % for obtaining 28-d compressive strength of 96.36 MPa. The atomic percentage of Ca/Si of the hydration products in the AARWFSCMs fluctuated within 0.94–1.50. The hydration products were a mixture of C–S–H and C–A–S–H. Moreover, the experimental results illustrated that the nano-TiO 2 , which highly beneficial in improving the compressive strength of AARWFSCMs. The additions of 0.50 % ANT and 0.75 % RNT resulted in increments of 5.9 % and 12.8 % in the 28-d compressive strength of AARWFSCMs, respectively. The obtained results provide a new method of utilization of RWFS and improving the sustainability of the construction industry.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 24
·2001604
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IF 16.836
Lingxia Zheng,Xiaolei Deng,Yongzhi Wang,Jiaxin Chen,Xiaosheng Fang,Liang Wang,Xiaowei Shi,Huajun Zheng
A novel inorganic–organic heterojunction (TiO 2 /P3HT (poly(3-hexylthiophene)) is easily prepared by a combination of anodization and vacuumed dip-coating methods, and the constructed flexible fibrous photodetector (FPD) exhibits high-performance self-powered UV–visible broadband photoresponse with fast speed, high responsivity, and good stability, as well as highly stable performance at bending states, showing great potential for wearable electronic devices. Moreover, Au nanoparticles are deposited to further boost the responsivity and selectivity by regulating the sputtering intervals. The optimal Au/TiO 2 /P3HT FPD yields an ≈700% responsivity enhancement at 0 V under 350 nm illumination. The sharp cut-off edge and high UV–visible rejection ratio (≈17 times higher) indicate a self-powered flexible UV photodetector. This work provides an effective and versatile route to modulate the photoelectric performance of flexible electronic devices.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yaxuan Luo,Yanwei Wang,Yalong Liao,Ruo Qiang,Ye Yuan,Yu Ma,Xianxian Sun,Huibin Xu,Enshuang Zhang,Yibin Li
The substantial porosity and adaptability of ceramic aerogels render them promising for various applications. Nonetheless, the conventional compromise among volume density, mechanical properties and thermal stability constrains their applicability in specific contexts. In this study, we have developed and synthesized TiO 2 nanowire aerogels featuring a three-dimensional interlocking network structure. This design imparts the aerogels with exceptional characteristics, including ultra-lightness, high specific strength, and low thermal conductivity. The ceramic aerogels were synthesized through a straightforward hydrothermal reaction process. The resultant TiO 2 nanowire aerogels demonstrate exceptionally low volume densities, reaching values as low as 10 mg/cm 3 . They exhibit specific strengths up to 11 MPa/(g/cm 3 ) and possess remarkable thermal insulation properties, maintaining mechanical stability across a broad temperature range from −196 to 800 °C. Additionally, they feature an ultra-low thermal conductivity of 0.023 W/(m·K) in air. This study aims to advance the development of innovative designs for high-performance ceramic aerogels, thereby enhancing their applicability across various fields.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Zhipeng Xie,Lu Wang,Yuhui Cheng,Qian Guo,Haibo Zhou,Congshu Huang,Jingjing Wang,Weifeng Bu
Improving the performance of antifouling coating under illumination-involved harsh environments is of prime scientific and engineering importance. However, it still remains a big challenge due to the strong photo-corrosion character of cuprous oxide (Cu 2 O) that works as the most widely-used primary antifoulant. To address this issue, a novel heterojunction of Cu 2 O@TiO 2 was constructed by in situ adsorption-hydrolysis approach. The as-designed heterojunction structure endows superior photo-stability with Cu 2 O@TiO 2 , which has been proven to proceed via S-scheme mechanism by a set of complementary characterizations including in situ XPS and EPR. As anticipated, the resulted Cu 2 O@TiO 2 coating manifests excellent stability and antifouling performance under illumination-involved mimetic service conditions such as dry-dock and waterline environments, as substantiated by the bioassays and marine field trials. A dual-target photo-synergized enhancing mechanism for the S-scheme Cu 2 O@TiO 2 could be deduced as to: (i) inhibit the accumulation of holes on Cu 2 O to exert a stabilization effect; (ii) boost the generation of reactive oxygen species (ROS, including HO /O 2 − ) to enhance the antifouling property. The methodology provides a proof-of-concept design to fabricate high photo-stable Cu 2 O-based antifoulant materials, with the gain in understanding the intrinsic failure principle of coatings and the biocidal mechanism of cuprous oxide toward marine application.
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Ya-Zhao Gao,Imran Muhammad,Chun-Mei Zha,Tie-Zhen Ren,Guan Zhang,Zhi-Jun Ren,Jin-Shan Yan,Xue-Jun Zhang
High-temperature corrosion is a major factor contributing to the degradation of industrial components, and composite coatings are one of the effective solutions to this issue. To solve this problem, we design an innovative strategy that utilizes thiol–ene click chemistry to graft nano titanium dioxide (TiO2) onto graphene oxide (GO), forming a composite coating with methyl phenyl silicone resin. This method significantly enhances the thermal stability, corrosion resistance, and self-cleaning properties of the coating. Detailed characterization using SEM, TEM, FTIR, and XRD confirmed the successful covalent bonding of TiO2 with GO, resulting in a composite coating with excellent structural stability. The modification markedly enhances the dispersion and interfacial compatibility of GO-TiO2 within the silicone resin matrix, leading to superior mechanical integrity. Electrochemical analysis reveals that GO-TiO2 extends corrosion pathways and reduces ion permeation, significantly boosting the corrosion resistance of the resin. Notably, the incorporation of just 0.2 wt% GO-TiO2 results in a significant enhancement of the coating thermal stability and its resistance to degradation in high-temperature corrosive environments, while also imparting superior self-cleaning properties. This efficient grafting method offers a transformative framework for developing next-generation nanocomposite coatings with heightened resilience for extreme operational settings.
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Yi-Yan Liao,Qiang Sun,Xu-Ping Jiang,Hao Wu,Bang-Zhou Tian,Ze-Gao Wang,Kun Zheng,Lei Yang
The coupling of charge carrier and phonon transport limits the application of Ag 2 Se as a low-toxic near-room-temperature thermoelectric material. Strategies that reduce the thermal conductivity via enhancing the phonon scattering usually lead to reduced carrier mobility due to high grain boundary potential barrier. In this study, we developed a cell-membrane-mimic grain boundary engineering strategy for decoupling the charge carrier and phonon scattering through decorating high-dielectric-constant rutile TiO 2 at Ag 2 Se grain boundaries to enable the charge carrier/phonon selective permeability. The nano-sized TiO 2 with high dielectric permittivity can secure the charge carrier transport by shielding the interfacial Coulomb potential to lower the energy barrier of grain boundaries, rendering an enhanced power factor. Additionally, benefited from the enhanced phonon scattering by TiO 2 nanoparticles, a significantly decreased lattice thermal conductivity of ∼0.20 W m −1 K −1 and a high zT of ∼0.97 at 390 K are obtained in the Ag 2 Se-based nanocomposites. This work demonstrates that such cell-membrane-mimic grain boundary engineering strategy may shed light on developing high-performance thermoelectric materials.
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高影响因子
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