COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Fan Wang,Hang Luo,Di Zhai,Zhida Xiao,Li Zeng,Xueying Wang,Zhitao Hu,Huan Wang,Lihong Liu,Dou Zhang
Dielectric capacitors consisting of ceramic/polymer nanocomposites have been widely used in electrical and electronic fields due to the advantages of high power density, high stability and improved energy density . However, the mismatching of dielectric constant between ceramics and polymers seriously limits the improvement of energy density of dielectric capacitors. In this work, a novel kind of core-double shell structured ceramic filler BaTiO 3 @TiO 2 @SiO 2 (BT@TO@SO) is prepared by a two-step hydrolysis method and introduced into PVDF for high performance dielectrics. This core-double shell structured filler forms multi-layer interface with gradually reduced dielectric constants of BT, TO, and SO, which is beneficial to enhance the interface polarization and reduce the electric field concentration caused by dielectric mismatch. In addition, the high insulating properties of the outer layer of SO can greatly limit the electron migration and reduce the leakage current. The experimental results show that when the loading of BT@TO@SO filler is low, the nanocomposite can achieve an energy density of up to 19.7 J/cm 3 and an efficiency of 57.6% at 620 MV/m, which shows an obvious improvement compared with filling BT or BT@SO. The results of finite element analysis further verify the superiority of this core-double shell structure.
研究领域:
材料科学
·
电气工程
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 13
·1-19
·
IF 3
Zhang Xia,Zhou Mengqin,Wan Xiu,Liu Xi,Hao Shixiong,Cheng Chunru,Xiao Zhongming,Wang Yongfan
To address the challenges of titanium dioxide's low utilization of visible light, easy recombination of photogenerated charges, and insufficient interfacial contact when integrated with other semiconductors to form heterojunctions, a novel, simple, and easy hybrid MOF template-directed method was developed to enhance the interaction between oxide and support, thereby constructing In 2 O 3 @TiO 2 - x (IT- x ) composites with tightly contacted heterojunction interfaces. After 120 minutes of exposure to visible light, the IT-30% realized a 91.98% degradation rate for tetracycline in wastewater with an initial concentration of 30 mg/L, which is 1.46, 3.39, and 2.07 times higher than that of bare TiO 2 , bare In 2 O 3 , and Degussa-P25, respectively. After 5 cycles (10 h), the IT-30% photocatalyst still maintained high photocatalytic activity with a 14.47% decline in tetracycline degradation efficiency. The experiments on free radical trapping and electromagnetic spin resonance (ESR) revealed that the superoxide radical is the primary active substance in the tetracycline photocatalytic degradation. SEM, HRTEM, and XRD characterization techniques were utilized to demonstrate the successful preparation of hollow composites. The results of BET, UV-Vis DRS, XPS, photoluminescence (PL), and electrochemical impedance spectroscopy (EIS) indicate that the high photocatalytic activity of the prepared IT-30% composite is ascribed to its large specific surface area, strong capacity for visible light absorption, generate abundant oxygen vacancies generated in the composites, and efficient separation and migration of photogenerated carriers. In addition, a possible degradation pathway for tetracycline was proposed according to the HPLC-MS test results of intermediate products.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yanlei Liu,Mengbo Shan,Lange Du,Weihao Sun,Dapeng Wu,Qing Bi,Hongju Wang,Yufang Liu
A scalable strategy with commercial feasibility was developed to in situ generate TiO 2 nanowires/amorphous CuS@TiO 2 nanolayer (TiO 2 /CuS@TiO 2 ) composites on the surface of titanium mesh through a sequent hydrothermal method, successive ionic layer adsorption and reaction (SILAR), and atomic layer deposition (ALD) techniques. The TiO 2 /CuS@TiO 2 composites could respectively harness the incident light with different spectra at the photothermal center (CuS, visible and near-infrared light) and photocatalytic center (TiO 2 , UV and visible light), which leads to the effective utilization of the solar energy. Benefiting from the CuS photothermal-induced local heating effect of CuS, the adjacent micro-zone temperature could be elevated and the activation energy barrier could be reduced by 10.5 kJ mol −1 , which promotes the activation of surface lattice oxygen and dissolved oxygen in the photocatalytic process. Meanwhile, the ALD generated TiO 2 nanolayer could both serve as reactive centers but also protecting armor for the CuS, which prohibited the peeling and oxidation of the thermal centers, leading to a high stability of the photocatalyst, which exhibits no obvious fading after 20-cycle reuse. A flow reactor was conceived and made by 3D print and the Ti-mesh based photocatalyst was integrated, which demonstrates high photocatlytic performances, manifesting its great potential for large-scale water treatment.
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产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Li Dong,Hongwei Chu,Ying Li,Shengzhi Zhao,Dechun Li
Transition metal oxides (TMOs) are drawing multitudinous interest due to their strong thermochemical stability. In the present work, we proposed a facile strategy to fabricate TiO 2 /CuO nanocomposites . By using the conventional open- and closed-aperture Z-scan technology, the eminent nonlinear optical (NLO) properties of the as-prepared TiO 2 /CuO nanocomposites were demonstrated. In order to deeply investigate the NLO enhancement mechanism, we established a theoretical model to study the photogenerated carriers transfer dynamics at the interface with rate equations and the fouth-order Runge-Kutta algorithm. The simulation results indicated that under pumping irradiation, the carriers transferring from CuO to TiO 2 promoted the nonlinear optical absorption of CuO nanosheets and increased the modulation depth. Experimentally, the transient absorption spectroscopy and broadband time-resolved pump-probe measurements were presented to study the role of the carrier dynamics in the broadband near-infrared region. To further confirm the enhanced NLO response in TiO 2 /CuO nanocomposites, a highly stable dissipative soliton mode-locked Yb-doped fiber laser with TiO 2 /CuO saturable absorber was constructed at 1 μm for the first time. Our work manifested the key effects of the interface in TiO 2 /CuO nanocomposites to boost the NLO features which can be applied in ultrafast photonics applications.
研究领域:
材料科学
·
光学
·
超快光子学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Zuliang Wu,Zhoubin Zhu,Xiaodong Hao,Weili Zhou,Jingyi Han,Xiujuan Tang,Shuiliang Yao,Xuming Zhang
Non-thermal plasma technology has great potential in reducing polycyclic aromatic hydrocarbons (PAHs) emission. But in plasma-alone process, various undesired by-products are produced, which causes secondary pollutions. Here, a dielectric barrier discharge (DBD) reactor has been developed for the oxidation of naphthalene over a TiO 2 /diatomite catalyst at low temperature. In comparison to plasma-alone process, the combination of plasma and TiO 2 /diatomite catalyst significantly enhanced naphthalene conversion (up to 40%) and CO x selectivity (up to 92%), and substantially reduced the formation of aerosol (up to 90%) and secondary volatile organic compounds (up to near 100%). The mechanistic study suggested that the presence of the TiO 2 /diatomite catalyst intensified the electron energy in the DBD. Meantime, the energized electrons generated in the discharge activated TiO 2 , while the presence of ozone enhanced the activity of the TiO 2 /diatomite catalyst. This plasma-catalyst interaction led to the synergetic effect resulting from the combination of plasma and TiO 2 /diatomite catalyst, consequently enhanced the oxidation of naphthalene. Importantly, we have demonstrated the effectiveness of plasma to activate the photocatalyst for the deep oxidation of PAH without external heating, which is potentially valuable in the development of cost-effective gas cleaning process for the removal of PAHs in vehicle applications during cold start conditions.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
ORGANIC ELECTRONICS
·
2017
·
IF 3.399
Cuncun Wu,Ziru Huang,Yihao He,Wei Luo,Hungkit Ting,Tieyi Li,Weihai Sun,Qiaohui Zhang,Zhijian Chen,Lixin Xiao
Recently, perovskite solar cells have attracted tremendous research interest due to their amazing light to electric power conversion efficiency (PCE). However, most high performance devices usually use mesoporous TiO 2 as the electron transport layer (ETL), which increases cost for practical application. Here, TiO 2 /SnO x Cl y double layer was employed as the ETL for planar perovskite solar cells . Compared with bare TiO 2 , perovskite solar cell based on TiO 2 /SnO x Cl y shows drastically improved power conversion efficiency and reduced hysteresis. These improvements are attributed to TiO 2 /SnO x Cl y which could enhance electron extraction and reduce surface trap-state.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
SOLID STATE IONICS
·
2022
·
IF 3.699
Haisheng Yi,Yu Liu,Xia Lu
Interfacial chemistry plays an important role in understanding electrode process kinetics of many chemical reactions, e.g. photocatalyst , electrocatalyst , and electrochemistry . In this context, a systematic investigation is conducted to reveal the mechanism of electrode-electrolyte interface between Li 4 Ti 5 O 12 (LTO) spinel and electrolyte molecule, aiming to tackle the notorious package swelling issue in rechargeable batteries. Using the gas chromatography–mass spectrometry and electron microscopy techniques, the interplays between the LTO and dimethyl carbonate (DMC) are uncovered to be a synergetic chemical catalytic process involving the truncated oxygens of the surface Ti O dangling bonds , which are negatively polarized as the catalytic centers with the strong Lewis basicity . The Lewis basic centers catalyze the nucleophilic substitution of DMC with only trace amounts of water, resulting in the gaseous products, such as CO 2 and methanol. These findings deepen the understandings on the fundamental chemistry and catalysis of solid-liquid interfaces, especially the metal oxide-organic interfaces.
研究领域:
电化学
·
催化化学
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DOI
高影响因子
Small
·
2020
·Vol. 16
·期 26
·2000030
·
IF 11.459
Yaru Liang,Xiang Xiong,Zhuijun Xu,Qingbing Xia,Liyang Wan,Rutie Liu,Guoxin Chen,Shu-Lei Chou
Lithium-ion batteries (LIBs) have been widely applied and studied as an effective energy supplement for a variety of electronic devices. Titanium dioxide (TiO 2 ), with a high theoretical capacity (335 mAh g −1 ) and low volume expansion ratio upon lithiation, has been considered as one of the most promising anode materials for LIBs. However, the application of TiO 2 is hindered by its low electrical conductivity and slow ionic diffusion rate. Herein, a 2D ultrathin mesoporous TiO 2 /reduced graphene (rGO) heterostructure is fabricated via a layer-by-layer assembly process. The synergistic effect of ultrathin mesoporous TiO 2 and the rGO nanosheets significantly enhances the ionic diffusion and electron conductivity of the composite. The introduced 2D mesoporous heterostructure delivers a significantly improved capacity of 350 mAh g −1 at a current density of 200 mA g −1 and excellent cycling stability, with a capacity of 245 mAh g −1 maintained over 1000 cycles at a high current density of 1 A g −1 . The in situ transmission electron microscopy analysis indicates that the volume of the as-prepared 2D heterostructures changes slightly upon the insertion and extraction of Li + , thus contributing to the enhanced long-cycle performance.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
G. Wei,F. Niu,Z. Wang,X. Liu,S. Feng,K. Hu,X. Gong,J. Hua
Polymer heterojunctions have emerged as promising photocatalysts for the photocatalytic hydrogen evolution . However, they are usually used in the form of suspended powder due to the low solubility and lack of anchoring groups to hybridize with inorganic semiconductor oxides . Yet polymer film heterojunctions with convenient separation and recycling potential are more suitable for large-scale water splitting. Herein, a new solution-processable polymer PDBCOOH with biphenyl as the electron donor and diketopyrrolopyrrole (DPP) containing carboxyl group as the electron acceptor has been designed and synthesized. Surface anchoring of PDBCOOH to TiO 2 films through covalent bonding formed polymer-TiO 2 film heterojunctions that achieved a recorded photocatalytic H 2 production rate of 11.9 mmol/m 2 /h without Pt co-catalyst and was 88.8 times higher than that of pristine TiO 2 film. Transient absorption spectroscopy confirms ultrafast polymer excited state electron injection into TiO 2 , long-lived charge separated state, and unity yield of polymer hole regeneration. Photoelectrochemical experiments combined with density functional theory calculation further demonstrate that polymer PDBCOOH /TiO 2 film heterojunctions not only accelerate the charge transfer but also significantly improve the hydrogen evolution rate and stability of the photocatalysts. This work offers a new strategy for obtaining stable and efficient photocatalysts by using the covalent anchoring strategy of polymer/TiO 2 film heterojunction.
研究领域:
材料科学
·
光催化
·
能量转换
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 102
·83795-83800
·
IF 3.84
Dezhong Zhang,Fuyi Jing,Fengli Gao,Liang Shen,Dongming Sun,Jingran Zhou,Yu Chen,Shengping Ruan
The performance of a Schottky metal–semiconductor–metal (MSM) ultraviolet (UV) photodetector is limited by the insufficient gain and the uncontrollable noise current. A remarkable detectivity UV detector is demonstrated based on graphene oxide (GO) modified TiO2 with high gain and low noise. The GO layer completely prevents the flow of electrons forming a hole-only device thus decreasing the dark current and noise current. Furthermore, gain of the holes is promoted under UV illumination. Moreover, the GO layer efficiently extracts the holes therefore reducing the fall time. Under a bias of 6 V, the responsivity value reaches 826.8 A W−1 and the noise current is only 1.8 pA, thereby, our device provides a detectivity of 2.82 × 1013 cm Hz1/2 W−1 at 280 nm. The results offer an effective approach to enhance the performance of a UV detector.
研究领域:
材料科学
·
光电探测
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DOI
高影响因子
ChemNanoMat
·
2016
·Vol. 2
·期 7
·647-651
·
IF 0
Manas Pal,Hao Wu,Yunke Jing,Xiaomin Li,Hongwei Zhu,Changyao Wang,Shuai Wang,Abdullah M. Al-Enizi,Yonghui Deng,Gengfeng Zheng,Dongyuan Zhao
Graphical Powered by the sun : A facile and low-cost synthesis of core–shell p-Si@mesoporous n-TiO 2 hybrid material was developed for solar-driven photoelectrochemical (PEC) production of H 2 . Core–shell heterostructured nanomaterials with mesopores have enormous potential applications in diverse fields. Herein, we report a facile extended Stöber method to synthesize core–shell heterostructured semiconducting nanomaterials with mesoporosity. Silver (Ag) metal-assisted chemically wet etched p-type silicon nanowires (Si NWs) were used as the core, and layer-controllable mesoporous n-type anatase TiO 2 was grown as the shell to successfully fabricate the core–shell p-Si@mesoporous n-TiO 2 hybrid materials. Detailed characterization reveals that the TiO 2 shell was composed of aggregated crystalline TiO 2 nanoparticles with diameters of ≈15 nm, where the TiO 2 coating thickness was tuned ≈50 nm. The interstitial pores of these nanoparticles were observed with average pore sizes of 4–8 nm. The core–shell structured p-Si@mesoporous n-TiO 2 hybrid materials were demonstrated as photocathodes for the solar-driven photoelectrochemical (PEC) production of H 2 at the semiconductor/electrolyte interface.
研究领域:
材料科学
·
能源科学
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DOI
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 18
·9019-9026
·
IF 5.968
Qian Li,Kui Cheng,Wenjian Weng,Piyi Du,Gaorong Han
Uniformly dispersed and size-controllable TiO2 nanodots (TN) were directly synthesized on indium-tin-oxide (ITO) electrodes and were further utilized to immobilize horseradish peroxidase (HRP) enzyme and facilitate direct electron transfer for construction of a hydrogen peroxide (H2O2) biosensor. The enzyme adsorption ability of TN/ITO electrodes were investigated using a UV–vis spectrometer, and the results indicated that TiO2 nanodots possess better enzyme adsorption ability than TiO2 film, and this ability could be further improved by varying the mean diameter of the nanodots from 30 nm to 79 nm. The sensitivity of the H2O2 biosensors based on Nafion/HRP/TN/ITO electrodes was significantly increased by adjusting the dimension of TiO2 nanodots on the modified electrode and the sensitivity differences among these electrodes are in accord with their enzyme adsorption ability. TiO2 nanodots with the largest diameter (79 nm) on a ITO electrode had the best enzyme adsorption ability and biosensor performance with a high sensitivity of 1176 μA mM−1 cm−2 as well as a wide linear range of 1–780 μM. These results show that well-dispersed, high surface area and high curvature TiO2 nanodots could be a promising material for protein adsorption and fabrication of electrochemical biosensors.
研究领域:
生物传感技术
·
材料科学
·
酶工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）