JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Bo-Wei Xun,Yu-Cheng Tang,Jian-Yin Chen,Bo-Ping Zhang
We reported a facile analysis and reduction of oxygen vacancy ( V O • • ) in 0.7Bi(Fe 1- x Sc x )O 3 -0.3BaTiO 3 (0≤ x ≤0.08) ceramics. The leakage current mechanism was investigated intensively. Our results indicated that oxygen vacancies are the main cause for the high conductivity in BF-BT ceramics, and their concentration was quantitatively estimated from the Bi 3+ content and the average oxidation state of iron. The V O • • concentration was effectively suppressed and the insulation resistance was enhanced by almost two orders of magnitude after doping 2%mol Sc 3+ . The enhanced insulation resistance contributed to excellent piezoelectric properties with d 33 = 165 pC/N, T C = 505 °C, and k p = 26%. The proposed analysis method used to quantify the V O • • concentration provides valuable indications to reduce the leakage current density and improve the piezoelectric properties of BF-BT based ceramic.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 6
·1-12
·
IF 2.8
Tang Lanxin,Li Shuangchi,Wang Fang,Chen Yu
The binary perovskite-type compound (1 − x )BiFeO 3 – x BaTiO 3 (BF-BT) is considered as a promising high-temperature lead-free piezoelectric material due to its high Curie temperature ( T C > 400 °C) and better electromechanical properties. In this work, ternary lead-free piezoelectric ceramics with a chemical formula of (0.67 − x )BiFeO3–0.33BaTiO3– x Bi(Zn0.5Ti0.5)O 3 + 1 mol% MnO 2 (where x = 0–0.05) were prepared by the conventional solid-state reaction route. The effects of Bi(Zn 0.5 Ti 0.5 )O 3 introduction on the phase structures and microstructures, piezoelectric and dielectric properties, as well as impedance characteristics of BF-BT ceramics were investigated in detail. Firstly, all the samples synthesized exhibit a pure perovskite structure with the coexistence of rhombohedral ( R ) and tetragonal ( T ) phases, and the T phase content increases with increase in x . A small amount of Bi(Zn 0.5 Ti 0.5 )O 3 ( x ≤ 0.03) that were incorporated into the perovskite lattice of BF-BT can promote the grain growth of ceramics. Secondly, all samples were found with a notable relaxed phase transition behavior, T C of the system decreases with increase in x . The AC impedance spectra of the samples were fitted and analyzed according to the R-CPE equivalent circuit model, the electric impedance of the ceramics at high temperatures was mainly contributed by grain boundaries. Moreover, the dielectric relaxation activation energy of the samples firstly decreases and then increases with increase in x . Finally, the composition with x = 0.02 shows the optimized electrical properties among these samples, including T C = 454 °C, d 33 = 117 pC/N, k p = 23%, tan δ = 0.11, which are mainly benefited from the bismuth content compensation and the substitution of (Zn 0.5 Ti 0.5 ) 3+ for Fe 3+ at B-site reducing the valence change of Fe 3+ in BF-BT.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Shanshan Ding,Danjun Mao,Shaogui Yang,Fei Wang,Lingjun Meng,Mengshu Han,Huan He,Cheng Sun,Bin Xu
The novel boron nitride coupled Bi-rich Bi 4 O 5 Br 2 layered microspheres (h-BN/Bi 4 O 5 Br 2 -LMs) were successfully synthesized via a facile ionic liquid-in-water (IL/W) microemulsion-mediated route. The physical, chemical and optical properties of these heterojunction photocatalysts were thoroughly characterized with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectrometry (EDS), transmission electron microscopy (TEM) and UV–vis diffuse reflection spectroscopy (DRS). Their photocatalytic activities were primarily evaluated by degradation of 4- tert -butylphenol (PTBP), which found 1.0 wt% h-BN/Bi 4 O 5 Br 2 -LMs to be the best one. The photocurrent experiments showed that the photocurrent density of 1.0 wt% h-BN/Bi 4 O 5 Br 2 -LMs was four times higher than that of pure Bi 4 O 5 Br 2 -LMs due to enhanced charge transfer ability of the former. It revealed that the addition of h-BN was in favor of suppressing the photoinduced electron-hole pair recombination of Bi 4 O 5 Br 2 -LMs, so as to improve the photocatalytic activity of the composite. O 2 − and h + were proved to be the main reactive species in the photocatalytic process by scavenger experiments and electron paramagnetic resonance (EPR) spectra. In addition, the photocatalytic mechanism of h-BN/Bi 4 O 5 Br 2 -LMs was further elaborated in this work. The probable degradation products were identified by GC–MS. The proposed conjugated addition and oxidation reactions were described to be the main pathways by combining the frontier electron density calculation and GC–MS results.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Jin Qin,Shangshi Ye,Kai Yan,Jingdong Zhang
A visible light-driven photoelectrocatalytic system was constructed based on Bi/Bi 2 O 3 /TiO 2 nanotubes (NTs) to treat wastewater containing oxytetracycline and Cu 2+ mixed pollutants. The surface morphology , crystal phase, elemental composition , light absorption property and photoelectrochemical activity of the synthesized Bi/Bi 2 O 3 /TiO 2 NTs were investigated. The composite film , Bi/Bi 2 O 3 /TiO 2 NTs was used for the photoelectrochemical removal of oxytetracycline, and it had excellent visible light photoelectrocatalytic performance. Under optimal conditions, the composite film was simultaneously used to remove coexisting oxytetracycline-Cu 2+ . The study results show that the reduction of Cu 2+ on cathode was promoted by oxytetracycline while the degradation of oxytetracycline on photoanode was slightly suppressed by Cu 2+ . Also, possible photoelectrocatalytic degradation pathways for oxytetracycline-Cu 2+ were analyzed by HPLC-MS.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Yixuan Zhang,Guo-Qiang Liu,Chang Su,Danlei Qiao,Xiaojing Xu,Jiaguan Chen,Guang-Yin Liu,Qiang Sun,Lei Wen
Layered oxides are the widely investigated cathodes for sodium-ion batteries (SIBs), especially their pure phases (e.g., P2, O3). In this work, we report a series of Mn-Ni-Fe based cathode materials with P2/O3 bi-phase, which possesses advantages of both P2 and O3 structures. At first, the manuscript shows a synthesis phase diagram of Na 0.83 Mn x Ni y Fe 1-x-y O 2 to pre-screen and select the P2/O3 bi-phase material Na 0.83 Mn 1/2 Ni 1/3 Fe 1/6 O 2 . Then, it is found that the cationic ratio has a significant impact on the phase formation. The structure of the materials gradually changes with the various of the Mn/Ni ratio. When the Mn/Ni ratio reaches 3/2, P2/O3 bi-phase is formed. Moreover, Fe content will influence the P2/O3 ratio in the bi-phase material. In particular, the synthesized bi-phase Na 0.83 Mn 3/6 Ni 2/6 Fe 1/6 O 2 has a P2/O3 ratio of 71/29 wt%. It delivers a high specific capacity of 136.6 mA h g −1 (at current density 20 mA g −1 ) between 2.0 and 4.0 V and 94.8% retention (at current density 100 mA g −1 ) after 100 cycles. In addition, an 85.6 mA h g −1 discharge capacity can be maintained at a superior high current density of 2000 mA g −1 . The work offers critical guidance to the rational design of the bi-phase layered cathode materials.
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高影响因子
CARBON
·
2023
·
IF 10.9
Qingyuan Zhao,Wenjie Zhao,Yinghao Wu
The limited interfacial combination between CF and polymer matrix caused by the chemical inertness of CF surface greatly restricts the protective capability of carbon fiber reinforced polymer coatings (CFRPCs), which could not effectively resist the impact of external forces, especially in the severe and complicated ocean environment (like deep-sea area and splash zone). Hence, it is the crux to enhance the interface compatibility and interface strength between fiber and resin. Based on the reliable compatibility between imidazole and epoxy as well as the corrosion inhibition effects of cerium-based compounds, a kind of bi-functional metal-organic framework (MOF) called the cerium-imidazole framework (Ce-MI) was constructed on the CFs surface via in-situ growth method to improve the interface compatibility and interface strength of fiber and resin and further increase protective performance of epoxy (EP) coating under the simulated deep-sea area and splash zone . After 168 h immersion under alternating hydrostatic pressure, CF@Ce-MI/EP coating displayed impressive impermeability and anti-corrosion performance, and the interfaces of fiber/epoxy adhered firmly. After the erosion wear test, the volume loss and mass loss of CF@Ce-MI/EP were decreased by 23.77% and 14.80%, respectively, compared with CF/EP. Finally, we discussed the protective mechanism of composite coating to reveal the different processes of interface failure caused by the high pressure and the impact of solid particles , respectively.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Yuzhen Wang,Xuanyi Yuan,Yongge Cao,Chaoyang Ma
With the rapid development of science and technology, the high-security-level anti-counterfeiting technique is essential for ensuring property or information security. In this work, we prepared micron NaYTiO 4 : Bi/Er (NYT: Bi/Er) phosphors with integrating up-conversion (UC) photoluminescence, down-shifting (DS) emission, phosphorescence and photochromism (PC) performances for advanced multiple anti-counterfeiting application. Owing to the abundant energy levels of Er 3+ ions, the UC and DS luminescence behaviors are anticipated. Specifically, the yellow-green emission of Er 3+ ions can be observed upon 980 nm excitation, and the bright green emission is demonstrated under 281 or 254 nm excitation due to the energy transitions of Er 3+ ions and the energy transfer process from Bi 3+ to Er 3+ ions. Besides, the introduction of Bi 3+ ions generates defect levels in the matrix and thus leads to phosphorescence. Furthermore, the repeatable PC performance could be triggered by the 365 nm irradiation and vanished with 450 nm illumination or thermal stimulation. To verify the practical usability of NYT: Bi/Er phosphors on anti-counterfeiting applications, some experiments are designed and successfully executed. It is believed that the NYT: Bi/Er phosphors can be a promising candidate for high-security-level multiple anti-counterfeiting.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Jinhui Zhang,Tongtong Xuan,Peng Li,Huanrong Li,Chengxin Wang,Jing Wang
Eu 3+ complexes are the prime candidates for luminescent down-shifting (LDS) converters of solar cells due to their high luminescent quantum efficiencies (LQE), large Stoke shifts and tunable excitation. However, their instability towards heat will shorten their life in solar cells, especially for outdoor use. Besides, the optical loss of the front glass and encapsulants will trade off the enhanced efficiency by photo-conversion. In this paper, highly emissive hybrid material Eu(PPO) n -C 4 Si@NZ (HY) was obtained by assembling europium complex into three different sizes of stable zeolite L functionalized with a water-soluble stopper. Then a bi-functional layer by incorporating HY (LDS) with anti-reflective SiO 2 was developed. Benefitting from the dual functions, the as-prepared cell with HY@SiO 2 film substrate manifests an increased external quantum efficiency (EQE) in both UV and the longer wavelength regions, compared with pure glass based c-Si solar cell. In the best case, the conversion efficiency of the c-Si solar cell is increased by a relative 3.30% (from 16.386% to 16.926%).
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高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 8
·569
·
IF 4.3
Jin Hu,Fangfang Liu
The low energy density (Ud) of polymeric dielectrics is unfavorable for the integration and miniaturization of electronics, thus limiting their application prospects. Introducing high-εr(dielectric constant) ceramic nanofillers to polymer matrices is the most common strategy to enhance theirεr,and hence theirUd. By comparison, enhancing breakdown strength (Eb) is a more effective strategy to enhanceUd. Herein, 0.6BaTiO3-0.4Bi(Mg0.5Ti0.5)O3and 0.85BaTiO3-0.15Bi(Mg0.5Zr0.5)O3nanofibers coated with SiO2were utilized as fillers in PVDF-based nanocomposites. The combination of experimental and simulation results suggests that the intrinsic properties of nanofillers are the determining factor of theEbof polymer-based nanocomposites, and SiO2coating and film structure design are effective strategies to enhance theirEb, and consequently theirUd. As a result, the sandwich-structured PVDF/6 wt% 0.85BaTiO3-0.15Bi(Mg0.5Zr0.5)O3@SiO2nanofiber within PVDF/PVDF nanocomposite films achieved a maximumUdof 11.1 J/cm3at anEbof 458 MV/m, which are 2.15 and 1.40 times those of pristine PVDF, respectively.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2015
·
IF 3.091
Meichao Gao,Dafeng Zhang,Xipeng Pu,Hong Li,Dongdong Lv,Bingbing Zhang,Xin Shao
Bi/BiOBr photocatalysts with improved photodegradation performances were synthesized by a facile one-step hydrothermal method using ethanol–water mixed solution. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, UV–vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The addition of ethanol results in the partial reduction of Bi 3+ ions to metallic Bi, different morphology from pure BiOBr , and the formation of oxygen vacancies. The dosage of ethanol plays a vital role in the morphologies and photodegradation performances of as-obtained Bi/BiOBr. The Bi/BiOBr photocatalysts show improved photodegradation performances, which is attributed to the high surface area, narrow band gap, and inhibited recombination of electron–hole pairs .
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高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2016
·
IF 3.958
Da Yang,Huan Liu,Dong-Liang Wang,Yong Lu,Xiao-Li Zhao,Ye Liu
The complex of Au-L1 containing imidazolyl ring and the phosphine-ligated-Au moiety was synthesized and applied as the efficient bi-functional catalyst for the one-pot sequential condensation/annulation reaction for the synthesis of pyridine derivatives. It was found that, as for Au-L1 , the involved imidazolyl group acted as a Lewis base to catalyze the condensation of carbonyl compounds with propargylamine to form the imino intermediate, and the involved Au + -complex species with alkynophilicity corresponded to the subsequent activation of imino-tailed alkynyl to afford dehydropyridine intermediate. The latter proceeded auto-oxidation reaction to afford the pyridine derivatives. The observed sequential catalysis over Au-L1 proved more efficient than that over the mechanical mixtures of the Au-complex ( Au-L2 ) and N -methylimidazole, because the free N -methylimidazole as an N-containing donor competed with the alkyne substrate to coordinate to Au-center. Moreover, Au-L1 exhibited good generality to a wide range of the substrates for the synthesis of 2,3-fused pyridine derivatives and 2-aryl(heteroaryl)-substituted pyridines.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 30
·64137-64145
·
IF 5.6
Guofeng Zhang,Rui Hu,Yichao Wang,Sicheng Gao,Zhaoyi Yin,Zhiguo Song,Jianbei Qiu,Yongjin Li
Realizing efficient far-red luminescence ( 5 D 0 → 7 F 4 transitions) from Eu 3+ ions in conventional hosts remains challenging due to the intrinsically limited energy transfer pathways. Herein, a novel dual-engineering strategy is proposed to synergistically increase the far-red emission of Eu 3+ within BiOCl nanosheets by co-introducing plasmonic metallic Bi and oxygen vacancies (OVs). Metallic Bi nanoparticles and the OVs are simultaneously incorporated into BiOCl:Eu nanosheets via a tailored solvothermal method, followed by in situ reduction. The synergistic interplay between the OVs and localized surface plasmon resonance of Bi drastically enhances the excitation harvesting and efficiency of energy transfer to the Eu 3+ activators. Consequently, the far-red emission intensity at 700 nm is remarkably enhanced 6.7-fold under 313 nm excitation, representing an unprecedented increase compared to that of pristine BiOCl:Eu. Furthermore, the precipitation of metallic Bi significantly enhances the thermal stability of the luminescence. This study provides fundamental insights into the synergistic plasmon-defect interactions within 2D semiconductors and establishes a promising pathway for use in developing high-performance far-red phosphors for application in advanced phosphor-converted white light-emitting diodes.
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高影响因子
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