JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
·
IF 3.235
Xiezhen Zhou,Siqi Liu,Hongxia Yu,Anlin Xu,Jiansheng Li,Xiuyun Sun,Jinyou Shen,Weqing Han,Lianjun Wang
A highly ordered three-dimensional macro-porous PbO 2 (3D porous PbO 2 ) electrode has been prepared for electrochemical oxidation of nitrogen-heterocyclic compounds. The 3D porous PbO 2 electrode was fabricated by templated electrochemical deposition method with TiO 2 nanotube arrays as substrate and SnO 2 -Sb as intermediate layer. The morphology and composition characterization of the 3D porous PbO 2 electrode was performed by field emission scanning electron microscopy and X-ray diffraction, which revealed a uniform distribution of highly ordered macro-porous β-PbO 2 structure. The Brunner−Emmet−Teller analysis suggested the electrode possessed large specific surface area of 37.39 m 2 ·g −1 . Electrochemical measurements indicated the electrode had a favourable oxygen evolution potential of 1.89 V and inner voltammetric charge of 14.48 mC·cm −2 , which were higher than that of conventional PbO 2 electrode. Furthermore, the electrochemical oxidation and TOC removal percentage of pyrrole , pyrazole and tetrazole obtained by 3D porous PbO 2 electrode were 93.4%, 72.7%, 61.2% and 66.7%, 57.3%, 38.6% respectively, which were also superior to conventional PbO 2 electrode. The intermediates were detected and analyzed by high-performance liquid chromatography, gas chromatography-mass spectrometer, and ion chromatography to propose a degradation pathway of pyrrole, pyrazole and tetrazole. Finally, quantum chemical calculation was introduced in this study by density function theory method, which is consistent with the experimental detection.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Wei Li,Xuerui Zhu,Xin Wang,Jie Liu,Baowen Liang,Tiesong Zheng,Jianlin Li
A new real-time monitoring method for alcohol content in spirit samples has been established on base of stable TiO 2 -coated porous silicon (PSi) interferometer. There is a linear relationship between the different alcohol contents in range of 10%–70% (v/v) and efficient optical thickness (EOT) or the reflection peak positions of the sensing film. The alcohol content of sample can be measured by the EOT or the reflection peak positions with the TiO 2 coated PSi interferometer. Both the straight TiO 2 -PSi and rugate TiO 2 -PSi can detect the alcohol contents, but the former displays a sensitivity of 2.911 nm ± 0.145/alcohol content unit (ACU) which is fifty times more sensitive than that of the latter. The developed method is a rapid, sensitive, on-line, and cost-efficient detection technique without sample pretreatment for alcohol content in spirit samples. The results detected by the developed method for alcohol content in nine spirit samples are agreement with that of traditional alcoholmeter method. The novel established method has a great potential in food industry, environment and health fields for monitoring alcohol content.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yang Yu,Yu Zhao,Tian-Dong Zhang,Rui-Xuan Song,Yu-Lei Zhang,Yu-Long Qiao,Wei-Li Li,Wei-Dong Fei
Colossal dielectric properties in donor-acceptor co-doped rutile TiO 2 ceramics have attracted increased interest in recent years. However, dielectric loss (tan δ) of (Nb+Al) co-doped TiO 2 ceramics are quite scattered in the previous studies. Here, we show the dielectric properties of (Nb+Al) co-doped rutile TiO 2 ceramics are sensitive to sintering and ageing technologies, which is related to the coupling behavior of acceptor-donor ions. Both permittivity and dielectric loss of as-sintered (Nb+Al) co-doped TiO 2 ceramics are very large, and increase with the sintering time increasing. After ageing treatment at 900 °C, the dielectric loss of co-doped ceramics reduces from 139 to 0.15 in a wide frequency range. Based on the X-ray diffraction and complex impedance analyses, it can conclude that Nb 5+ -Al 3+ pair formation during ageing treatment reduces the concentration of oxygen vacancy , resulting in the decreases of the conductivity and dielectric loss. The changes in dielectric response of (Nb+Al) co-doped TiO 2 ceramics clearly suggest that ageing process is an effective way for the Nb 5+ and Al 3+ ions to form the Nb 5+ -Al 3+ pairs. We believe that the coupling effect of donor-acceptor ions is a practical and feasible route to reduce the dielectric loss of (Nb+Al) co-doped TiO 2 ceramics for high-energy-density storage applications.
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高影响因子
Journal of Physical Chemistry C
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2018
·
IF 4.484
Jing Ma,Jingjing Chang,Zhenhua Lin,Xing Guo,Long Zhou,Ziye Liu,He Xi,Dazheng Chen,Chunfu Zhang,Yue Hao
With the fast development of the perovskite solar cell, its energy conversion efficiency has improved rapidly. In this paper, a CH3NH3PbI3–xClx organic–inorganic perovskite solar cell (PSC) was successfully prepared by the one-step solvent engineering method, and the planar heterojunction perovskite solar cell was optimized by interface engineering of the cathode interlayers. It was found that TiCl4 treatment could effectively reduce the TiO2 surface roughness, decrease the surface defects, improve the perovskite thin film crystallinity, and reduce the charge carrier recombination; hence, the short-circuit current density of PSCs and charge extraction and collection efficiencies were enhanced. Furthermore, PC60BM fullerene treatment could optimize the contact condition and reduce the interfacial potential loss. The device hysteresis effects after PCBM treatment were also reduced. The combination of TiCl4 and PC60BM treatments could largely improve the PSC device performance with a power conversion efficiency of 16.4% due to the synergetic effect.
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Catalysts
·
2018
·Vol. 8
·期 8
·326
·
IF 3.465
Peng Sun,Jun Zhang,Wenxiu Liu,Qi Wang,Wenbin Cao
In this paper, the Langmuir-Hinshelwood (L-H) model has been used to investigate the kinetics of photodegradation of gaseous benzene by nitrogen-doped TiO2(N-TiO2) at 25 °C under visible light irradiation. Experimental results show that the photoreaction coefficientkpmincreased from 3.992 × 10−6mol·kg−1·s−1to 11.55 × 10−6mol·kg−1·s−1along with increasing illumination intensity. However, the adsorption equilibrium constantKLdecreased from 1139 to 597 m3·mol−1when the illumination intensity increased from 36.7 × 104lx to 75.1 × 104lx, whereas it was 2761 m3·mol−1in the absence of light. This is contrary to the fact thatKLshould be a constant if the temperature was fixed. This phenomenon can be attributed to the breaking of the adsorption-desorption equilibrium by photocatalytically decomposition. To compensate for the disequilibrium of the adsorption-desorption process, photoreaction coefficientkpmwas introduced to the expression ofKLand the compensation form was denoted asKm.KLis an indicator of the adsorption capacity of TiO2whileKmis only an indicator of the coverage ratio of TiO2surface. The modified L-H model has been experimentally verified so it is expected to be used to predict the kinetics of the photocatalytic degradation of gaseous benzene.Keywords:modified L-H model;N-TiO2;photocatalytic degradation;benzene
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Dawei Zhang,Gang Wang,Shudi Zhi,Kaile Xu,Lijing Zhu,Wenwei Li,Zhixiang Zeng,Qunji Xue
To improve the separation efficiency and decrease fouling of the membranes used in oil-in-water emulsions separation, a superhydrophilic and underwater superoleophobic TiO 2 /Al 2 O 3 composite membrane with ultra low oil adhesion was designed. TiO 2 nanorod arrays were prepared on Al 2 O 3 porous ceramic membrane surface by simple magnetron sputtering and hydrothermal oxidation. The microstructure and surface photosensitivity of TiO 2 nanorod array-coated ceramic membrane can effectively increase the efficiency of oil-water separation and reduce the degree of surface fouling. The layer of TiO 2 nanorod arrays not only reduced the pore size of traditional ceramic membrane (enhanced sieving effect of porous structures) but also endowed its superhydrophilicity (enhanced flux) and underwater superoleophobicity (enhanced oil/water selectivity and antifouling). Based on the superhydrophilicity (water contact angle (WCA) of 0°) and underwater superoleophobicity (oil contact angle (OCA) higher than 150°) of ceramic membrane, oil droplets were blocked by the membrane (oil-water separation efficiency 99.1% under gravity) and water will pass (flux is maintained at 41.8 L/(m 2 h) under gravity). It also has excellent anti-fouling ability due to the ultra-low oil adhesion force (0.084 mN) of the TiO 2 nanorod array-coating after UV irradiation. These features, combined with energy-saving, low-cost and easy-to-scale manufacturing schemes will be of great versatility and practicality in environmental rehabilitation and wastewater purification.
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JOURNAL OF MATERIALS SCIENCE
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2017
·Vol. 53
·期 5
·3332-3340
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IF 2.599
Ding Dong,Zhou Bo,Fu Wuyou,Lv Pin,Yao Huizhen,Liu Li,Wang Jun,Yang Haibin
Herein, we report an ionic cross-linkage process of synthesizing [001] preferred oriented anatase TiO 2 nanowires and nanotubes hybrid structure (TWTs) based on anodization method wherein varied amounts of TiF 6
2− ions are added in synthetic process. We show how the TiF 6
2− ions switch the growth direction of TWTs from [101] to [001] (denoted as T 101 WTs and T 001 WTs, respectively) and change their geometrical morphologies, i.e., small ionic radii TiF 6
2− ions migrate and partly replace the TiO 6
2− octahedra under electric field, which separate out and leave vacancies during annealing process, resulting in a reconstruction of TiO 2 . Importantly, absorption property and photoelectrochemical (PEC) performance of T 001 WTs exceed those of T 101 WTs. Furthermore, CdS QDs are assembled onto TWTs photoelectrodes by successive ionic layer adsorption and reaction technique. Likewise, T 001 WT/CdS presents superior absorption capability and enhanced PEC performance to those of T 101 WT/CdS. This could be attributed to their preponderances of improved light absorption capability and decreased electron recombination.
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TALANTA
·
2024
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IF 5.6
Shuning Yang,Li Tian,Weiwei Fu,Huiling Li,Chao Li,Yujia Song,Ruidan Li,Yanjia Guo,Lun Zhao
The novel TiO 2 and Ni-MOF materials were synthesized and utilized for the detection of permethrin (PET). A highly sensitive solid-state electrochemiluminescence (ECL) sensor was developed based on Ni-MOF@Ru(bpy) 3 2+ and Au NPs@TiO 2 . In this sensing platform, Ru(bpy) 3 2+ -Tripropyl Amine (TPrA) was used as a luminescent signal, Ni-MOF acted as a carrier to carry more luminescent reagents Ru(bpy) 3 2+ . Au NPs acted as promoters facilitated electron transport and TiO 2 could further enhance the luminescence intensity of the system by synergistical interaction with Au NPs. The possible mechanisms of signal amplification were investigated. The ECL intensity decreased significantly with increasing PET concentration, enabling the determination of PET amount through the observation of the change in ECL signal intensity (ΔI). Under optimal experimental conditions, the linear range of PET concentration from 1.0 × 10 −11 mol L −1 to 1.0 × 10 −6 mol L −1 , with a detection limit of 3.3 × 10 −12 mol L −1 (3S/N). This method was successfully applied to determine PET in various vegetable samples.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Juxing Zha,Duyu Zheng,Yuanshuang Wang,Zelin Xie,Gang Wu,Jiqiu Qi,Fuxiang Wei,Qingkun Meng,Xiaolan Xue,Danyang Zhao,Yongzhi Li,Qing Yin,Changrui Jiang,Qihang Zeng,Yanwei Sui,Bin Xiao
Flexible Sn/TiO 2 carbon nanofiber (ST-NCF) composites were constructed by doping TiO 2 into tin-based carbon nanofibers via coaxial electrospinning. Sn/TiO 2 carbon nanofiber was directly used as an anode for Lithium-ion Batteries (LIBs) and Potassium-ion Batteries (PIBs), which show exceptional electrochemical performances. The layered sheath/core structure of the material lead to its good electrochemical properties, where the core Sn carbon nanofiber was encapsulated by the sheath layer of TiO 2 nanoparticles. In addition to enhancing its electrical conductivity, the outer TiO 2 and N-doped carbon fiber matrix also provide a buffer zone for volumetric strain during charging and discharging. The fiber core Sn and sheath TiO 2 form a heterojunction interface on the two-dimensional tube surface, which increases the diffusion rate of ions and electrons. After 100 cycles, TiO 2 -NCF and ST-NCF-40%TBT (40% TBT indicates the percentage of TiO 2 in shell solution to the total composition of shell spinning solution) show capacities of 386.6 mAh g −1 and 1336 mAh g -1 , respectively, at 0.5A g -1 . After 2000 cycles, ST-NCF-40%TBT in LIBs displayed a high capacity of 299 mAh g -1 at 10 A g -1 . After 350 cycles at 1A g -1 , the capacity of ST-NCF-40%TBT in PIBs is reserved at 307 mA h g -1 . Due to the superior mechanical flexibility of ST-NCF-40%TBT films, it will be a promising anode candidate for flexible LIBs and PIBs.
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APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Haitao Zhang,Ningchen Ye,Runzhe Dong,Qing Li,Zheng Wang,Zifei Gao,Xiang Ji,Lin Liu,Juanjuan Ma,Zhiwei Tong
A simple electrochemical reduction technique was employed to generate Ti 3+ with strong reducing property on the anodic TiO 2 nanotubes (ATNTs). Utilizing Ti 3+ as the reducing agent, Pd 2+ was successfully reduced in situ to Pd 0 on the anodic TiO 2 nanotubes (Pd@ATNTs). Various characterization methods were employed to confirm that the proportion of Ti 3+ and the size of Pd nanoparticles could be controlled by adjusting the electrochemical reduction voltage. The obtained [email protected] exhibited satisfactory catalytic efficiency (TOF: 1302 h −1 ) in the Heck reaction between various aryl halides and olefins. Furthermore, [email protected] demonstrated high stability, with no significant loss of catalytic activity observed even after six cycles.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 9
·
IF 1.768
Tongbing Li,Dekun Sheng,Zhengrong Xiong,Xiumei Gao,Fance Ji,Yuming Yang
There is a contradiction in making completely opaque and white plastic film with a required high TiO 2 filling fraction, which resulted in inefficient pigment utilization and high cost. Two methods were used here to overcome the contradiction. Firstly, TiO 2 was grafted with poly(methyl methacrylate) (PMMA) by atom transfer radical polymerization to improve the pigment dispersion in poly(vinylidene) fluoride (PVDF). Secondly, minute amounts of carbon black (CB) were added into the PMMA- g -TiO 2 /PVDF system to enhance opacity and decrease TiO 2 fraction. The structure, morphology, and properties of PMMA- g -TiO 2 hybrid particles and composite films were investigated by FTIR, TEM, TGA, SEM, DMA, covering power meter, and UV/VIS spectrophotometer, etc. It was observed that PMMA- g -TiO 2 was dispersed uniformly as individual particles in PVDF due to the good compatibility between PMMA and PVDF. Therefore, the opacity of PMMA- g -TiO 2 /PVDF films was markedly higher than unmodified-TiO 2 /PVDF ones. Adding minute amounts of CB can significantly increase the opacity of the thin film due to its absorption effect on decreasing light transmittance. The contrast ratio (CR) of the PMMA- g -TiO 2 /PVDF film with 20 μm thickness and 25 vol % TiO 2 was 97.67%, lower than the critical CR 98% for a complete opacity, however, the CR of sample with 10 vol % TiO 2 was 98.1% as the CB concentration was 2 × 10 −4 g/cm 3 , saved more than 15% TiO 2 . We proposed that a critical thickness d 0 existed for the CB/PMMA- g -TiO 2 /PVDF composite films, under which the light reflectance increased as a function of thickness, otherwise, the reflectance kept constant. Besides, d 0 could be decreased by increasing CB concentration. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43064.
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MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Yanning Qu,Beibei Lou,Jie Ren,Yuan Yu,Lin Liao,Dongfeng Sun,Ru Yan,Xinyang Zhang,Shihu Lei
Quantum dot-based materials exhibit unique photocatalytic performance, however inefficient electron transfer and weak visible light absorption negatively affect the results. In this study, a hollow TiO 2 /black phosphorus quantum dot (BPQDs) composite with cavity reflection associated oriented electron transfer effects was developed for photocatalytic hydrogen (H 2 ) production. The H 2 evolution rate of TiO 2 /BPQDs composite is 19 times higher than that of BPQDs and 2.3 times higher than that of TiO 2 . BPQDs were demonstrated that effectively loaded into both external and internal layers of TiO 2 , the UV-Vis diffuse reflectance spectra revealed an increased light absorption capacity of the material after BPQDs loading. Photoelectric tests and density functional theory calculations demonstrated improved electron transfer ability of the composite. The research expands the design methods for BP-based composites, providing new insights into heterojunction enhanced efficiency for solar energy conversion.
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危险品化学品经营许可证（带存储）