JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 11
·10651-10659
·
IF 2.195
Huang Xuechen,Liu Bang,Wang Shuanghu,Liu Yuxi,Wu Gang
Bi 2 O 3 - and MgO-doped BaTiO 3 –(Na 1/4 Bi 3/4 )(Mg 1/4 Ti 3/4 )O 3 (BT–NBMT) ceramics were synthesized from a solid-state approach, and then the impacts of Bi 2 O 3 and MgO dosages on the structures and dielectric characteristics were studied. Obvious dual peaks were observed with Bi 2 O 3 dosage to 0.04 and MgO dosage to 0.02. The low-temperature dielectric stability and grain size of the Bi 2 O 3 dopant were improved, while those of the MgO dopant hardly changed with MgO dosage to 0.02, indicating the core/shell microstructure of BT–NBMT was formed following the dissolving-precipitating mechanism of BT systems doped with low-melting-point substances. The low-temperature dielectric stability of the Bi 2 O 3 - or MgO-doped BT–NBMT ceramics first improved and then deteriorated with the increase of doping concentrations. High-temperature stability and diffuse-state transition were found in the optimal ceramics. The second phases of Bi 2 O 3 and MgO, magnesium titanium compounds were observed in Bi 2 O 3 and MgO dopants, respectively. Bi 2 O 3 -doped and MgO-doped ceramics exhibited a fine-grained microstructure and significant grain growth, respectively, and the core/shell microstructure was responsible for the dielectric temperature stability for Bi 2 O 3 dopants and collapsed to a homogeneous one with remarkable grain growth and the second phases for MgO dopants.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Yingzi Lin,Junjie Chen,Hao Li,Lei Chen,Baoling Yuan,Chunyan Shi,Siwen Li,Gen Liu,Yuefeng Xie
Acid red 73 (AR73) is a representative dye pollutant that poses a threat to the environment and human health. Effectively removing this type of pollutant by conventional processes is difficult. However, this study found that compared with UV/PDS, UV/O 3 , and PDS/O 3 , UV/O 3 /PDS composite system had the highest degradation effect on AR73. The degradation efficiency in the composite system reached 97.61% within 30 min, and the synergistic coefficients in the composite system were all greater than 1. In the UV/O 3 /PDS system, ·OH was the main free radical that mainly degrades AR73. The increase of PDS dosage promoted the degradation of AR73, but the increase of O 3 dosage was difficult to greatly improve the degradation of AR73 effect. The kinetic model of the apparent reaction rate was determined. The UV/O 3 /PDS system can efficiently degrade AR73 in a wide range of substrate concentrations and pH levels, and at the same time showed good adaptability to various concentrations of anions (Cl − , CO 3 2− , SO 3 2− , and C 2 O 4 2− ). Under raw water quality, the degradation effect of AR73 was still as high as approximately 90%. The theoretical attack site was obtained by DFT calculation , and the possible degradation pathway of AR73 was proposed based on the GC-MS spectrum and UV–Vis absorption spectrum . The attack of –N N- by ·OH, SO 4 − , and O 3 was proposed to be the main possible degradation pathway for AR73. Therefore, this study further improves the understanding of the UV/O 3 /PDS system and shows the potential applicability of this system in the treatment of dye wastewater.
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高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 10
·期 1
·337-345
·
IF 7.393
Hongrui Jia,Zhigang Liang,Zhen Li,Fei Li,Linghang Wang
Ferroelectric ceramic materials with large and temperature-insensitive strain responses are highly desired for the practical application of actuators in harsh environmental conditions. In this work, novel xBi(Mg1/2Zr1/2)O3–(0.55 − x)PbZrO3–0.45PbTiO3 (xBMZ-PZ-0.45PT) ternary ferroelectric ceramics were successfully fabricated by a solid-state reaction process. The phase structure of xBMZ-PZ-0.45PT ceramics gradually evolves from rhombohedral-tetragonal coexistence phases to rhombohedral phase with an increase in the BMZ content and the diffuse phase transition behavior becomes increasingly evident. The relaxation behavior is strongest for x = 0.35 composition. Pmax and Pr values first gradually increased, and then gradually decreased with increasing BMZ content, while Ec values display an increasing trend. A large strain response of 0.33% at 5 kV mm−1 was obtained in this ternary ferroelectric ceramics with x = 0.35, which can be attributed to the electric field-induced reversible ergodic relaxation phase to the ferroelectric phase transition. The strain was simultaneously temperature-insensitive with a slight decrease from 0.33% at 30 °C to 0.32% at 150 °C. The results indicate that BMZ-PZ-PT ternary ferroelectric ceramics are promising candidate materials for actuator applications in harsh environmental conditions.
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高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Lei Zhang,Tao Yuan,Luke Soule,Hao Sun,Yuepeng Pang,Junhe Yang,Shiyou Zheng
Sodium-ion batteries (SIBs) are promising candidates for inexpensive and sustainable energy storage devices for the widespread utilization of intermittent renewable energy because of the natural abundance of sodium raw materials. However, since the ionic radius of Na+ is inherently larger than that of Li+, Na-based intercalation materials often suffer from poor stability and slow reaction kinetics. Regarding SIB cathodes, layered transition metals oxides (NaxTMO2) show promising theoretical capacities but low stability. In this work, a series of O3-NaFe0.55Mn0.45–xNbxO2 (x = 0, 0.01, 0.02, and 0.03) compounds are synthesized and show superior stability and rate-capability compared with the pure oxide. For instance, the best-performing sample, NaFe0.55Mn0.44Nb0.01O2, has a specific capacity of 127 mAh g–1 and 80% capacity retention over 100 cycles at 0.1 C. Ex situ X-ray diffraction (XRD) result shows that the Nb incorporation could suppress TMO2 slip and reduce the energy barrier of the O3–P3 phases’ transition. When coupled with a hard carbon (HC) anode in a full cell, the battery exhibits significant weight and volume energy and power densities. It is believed that Nb-doping enlarges lattice spacing of the oxide and partially reduces Mn4+ to Mn3+, increasing the ionic conductivity of the cathodic materials.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Hongxian Wang,Peiyao Zhao,Lingling Chen,Xiaohui Wang
Multilayer Ceramic Capacitors (MLCCs) for energy storage applications require a large discharge energy density and high discharge/charge efficiency. Here, 0.87BaTiO 3 -0.13Bi(Zn 2/3 (Nb 0.85 Ta 0.15 ) 1/3 )O 3 (BTBZNT) powders were synthesized via solid-state reactions, and MLCCs with sub-micron grains were fabricated using a two-step sintering method. The BTBZNT MLCCs, which are well-defined relaxor ferroelectrics, possessed relatively high permittivity, dielectric sublinearity, and negligible hysteresis. An AC breakdown strength ( BDS ) enhancement from 511 to 1047 kV/cm was obtained as the dielectric thickness ( D ) decreased from 26 to 5 μm. The strong correlation between BDS and D , described as B D S ∝ D − 0.368 , agreed well with the general macroscopic theory of thermal breakdown in insulators. The enhanced BDS afforded the BTBZNT MLCCs ( D ∼9 μm) with excellent energy storage properties with a maximum discharge energy density of 10.5 J/cm 3 and discharge/charge efficiency of 93.7% under a maximum electric field of 1000 kV/cm. The MLCCs also exhibited excellent thermal stability with discharge energy density variation <±5% over a wide temperature range of −50 to 175 °C under an electric field of 400 kV/cm. These remarkable performances make BTBZNT MLCCs promising for energy storage applications.
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高影响因子
Journal of Physical Chemistry C
·
2016
·
IF 4.509
Zheng-Yao Li,Jicheng Zhang,Rui Gao,Heng Zhang,Lirong Zheng,Zhongbo Hu,Xiangfeng Liu
The effects of Li substitution for Ti on the structure and electrochemical performances of Co-free Na0.67Mn0.55Ni0.25Ti0.2–xLixO2 (x = 0, 0.1, 0.2) layered cathode materials for sodium ion batteries have been comprehensively investigated. X-ray diffraction and Rietveld refinement results demonstrate that Li mainly occupies TM (TM = transition metal) sites in the crystal structure to maintain the P2 structure majority and a small amount of Li atoms enter Na sites to generate some O3 phase. The discharge voltage, reversible capacity, rate capability, cycling performance, and Coulombic efficiency all have been improved by Li substitution, which can be largely attributed to the integration of P2 and O3. Li substitution also raises the average discharge voltage from 2.6 to 3.1 V. Na0.67Mn0.55Ni0.25Li0.2O2 (L02) can deliver an initial capacity of about 158 mA h g–1 at 0.05C (12 mA g–1) in comparison with the Li-free sample (147 mA h g–1). Even at the high rates of 480 (2C), 1200 (5C), and 1920 (8C) mA g–1, L02 can also display ca. 93, 65, and 38 mA h g–1 discharge capacities, respectively. The rate capability is higher than what is reported in the previous Li-substituted cathode materials. In addition, Li substitution in transition-metal sites generates more defects to maintain the charge neutrality, which enhances the electronic conductivity and also has a positive effect on the Na ion diffusion coefficient. The electronic conductivity and Na ion diffusion coefficient have been enhanced by 122% and 29%, respectively, with the substitution of Li for Ti. Our results also show that the oxidation peaks become sharper with increasing Li content, which indicates the feasibility of Na ion intercalation/deintercalation in the integrated P2/O3 phase. This study also offers some new insights into designing high-performance cathode materials for sodium ion batteries.
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高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Li Jin,Renjie Huo,Runping Guo,Fei Li,Dawei Wang,Ye Tian,Qingyuan Hu,Xiaoyong Wei,Zhanbing He,Yan Yan,Gang Liu
The electrostrictive effect has some advantages over the piezoelectric effect, including temperature stability and hysteresis-free character. In the present work, we report the diffuse phase transitions and electrostrictive properties in lead-free Fe3+-doped 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 (BZT-0.5BCT) ferroelectric ceramics. The doping concentration was set from 0.25 to 2 mol %. It is found that by introducing Fe3+ ion into BZT-0.5BCT, the temperature corresponding to permittivity maximum Tm was shifted toward lower temperature monotonically by 37 °C per mol % Fe3+ ion. Simultaneously, the phase transitions gradually changed from classical ferroelectric-to-paraelectric phase transitions into diffuse phase transitions with a weak relaxor characteristic. Purely electrostrictive responses with giant electrostrictive coefficient Q33 between 0.04 and 0.05 m4/C2 are observed from 25 to 100 °C for the compositions doped with 1–2 mol % Fe3+ ion. The Q33 of Fe3+-doped BZT-0.5BCT ceramics is almost twice the Q33 of other ferroelectric ceramics. These observations suggest that the present system can be considered as a potential lead-free material for the applications in electrostrictive area and that BT-based ferroelectric ceramics would have giant electrostrictive coefficient over other ferroelectric systems.
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高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Jie Li,Haoran Song,Tao Luo,Yan Cao,Linfeng Zhang,Qun Zhao,Zhanchao Li,Xuewei Hu,Junjie Gu,Senlin Tian
Exposure to ozone (O 3 ) and nitrogen dioxide (NO 2 ) are related to pulmonary dysfunctions and various lung diseases, but the underlying biochemical mechanisms remain uncertain. Herein, the effect of inhalable oxidizing gas pollutants on the pulmonary surfactant (PS, extracted from porcine lungs), a mixture of active lipids and proteins that plays an important role in maintaining normal respiratory mechanics , is investigated in terms of the interfacial chemistry using in-vitro experiments; and the oxidative stress induced by oxidizing gases in the simulated lung fluid (SLF) supplemented with the PS is explored. The results showed that O 3 and NO 2 individually increased the surface tension of the PS and reduced its foaming ability; this was accompanied by the surface pressure-area isotherms of the PS monolayers shifting toward lower molecular areas, with O 3 exhibiting more severe effects than NO 2 . Moreover, both O 3 and NO 2 produced reactive oxygen species (ROS) resulting in lipid peroxidation and protein damage to the PS. The formation of superoxide radicals (O 2 •– ) was correlated with the decomposition of O 3 and the reactions of O 3 and NO 2 with antioxidants in the SLF. These radicals, in the presence of antioxidants, led to the formation of hydrogen peroxide and hydroxyl radicals ( • OH). Additionally, the direct oxidation of unsaturated lipids by O 3 and NO 2 further caused an increase in the ROS content. This change in the ROS chemistry and increased • OH production tentatively explain how inhalable oxidizing gases lead to oxidative stress and adverse health effects. In summary, our results indicated that inhaled O 3 and NO 2 exposure can significantly alter the interfacial properties of the PS, oxidize its active ingredients, and induce ROS formation in the SLF. The results of this study provide a basis for the elucidation of the potential hazards of inhaled oxidizing gas pollutants in the human respiratory system.
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高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Rui Huang,Hongye Wang,Jian Zhang,Hua Hao,Zhonghua Yao,Hanxing Liu,Minghe Cao
Amorphous engineering is becoming a competitive strategy to address the huge challenge of low energy storage density, efficiency, and breakdown strength in dielectric ceramic capacitors, owing to the low remnant polarization and high breakdown strength of the amorphous structure. Herein, BaTiO3-Bi(Co0.5Zr0.5)O3 (BT-BCZ) thin films with an amorphous structure is proposed, which is expected to obtain large ΔP (Pmax – Pr) and energy storage density. Investigations on the electric performance of these thin film materials present that Bi3+ ions with a special electronic structure enhance the polarization of amorphous materials; simultaneously, the defect dipole structure formed by Co2+ ions and oxygen vacancy will be beneficial to the increment of polarization, while maintaining low remnant polarization. As expected, an outstanding energy storage density of 109.14 J cm–3 and efficiency of 81.17% are simultaneously realized in 0.85BT-0.15BCZ thin film. Moreover, an excellent temperature and cycle stability in wide temperature (20–150 °C) and cycle (1–105) ranges are exhibited, which suggests that BaTiO3-Bi(Co0.5Zr0.5)O3 thin films with an amorphous structure possess an extensive application prospect in dielectric ceramic capacitors.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xinyu Liu,Taotao Ai,Xinyu Chen,Qin Li,Qian Qiu,Ying Zheng,Yuan Zhou,Haikui Song,Kun Yu,Chunlin Song,Haibo Zhang,Gang Liu,Yan Yan
In recent years, lead-free Bi 0.5 Na 0.5 TiO 3 (BNT) based piezoelectric ceramics with excellent strain properties have gained widespread recognition for their application in high-precision displacement actuators. The (1- x )(0.82Bi 0.5 Na 0.5 TiO 3 -0.18K 0.5 Bi 0.5 TiO 3 )- x Ba(Fe 0.5 Sb 0.5 )O 3 ceramics were fabricated through the die-pressing method in this work. The effect of BFS introduction on the dielectric, ferroelectric and microstructure characteristics of BNKT ceramics was systematically investigated. Among these compositions, the BNKT-0.015BFS ceramics exhibited a piezoelectric strain coefficient ( d 33 *) of 658 pm/V at an electric field of 55 kV/cm, while achieving a strain response of 0.51 % at 85 kV/cm. The observed improvement in strain performance can be attributed to the evolution from non-ergodic relaxor state to ergodic relaxor state caused by BFS substitution. Furthermore, transmission electron microscopy (TEM) explicitly confirmed coexistence of rhombohedral and tetragonal phase and revealed the morphology of nanosized domains. This study adds to a deeper comprehension of the characteristics of strain response enhancement in BNT-based ceramics, opening up avenues for designing novel lead-free piezoelectric ceramics with outstanding electromechanical performance.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Dongxiu Lu,Ruhui Ma,Yuan Chen,Yuancai Chen
In this study, Ni-doped Ti/SnO 2 -Sb anode (Ti/NATO) was prepared and used for electrocatalytic ozone production and in-situ activated peroxymonosulfate (E-Ti/NATO-PMS) to degrade bisphenol A (BPA). SEM, XRD and XPS results indicated that Ni doping could influence the transformations of Sb 5+ and Sb 3+ ions, which decreased the agglomeration of crystallites and increased the O ads and oxygen vacancy (O v ) concentrations. Ti/NATO 1.0 anodes significantly improved the ozone production via outcompeting of the adsorbed O 2ads over water, and inhibiting the desorption of O 2ads , to obtain the highest O 3 concentration with low onset potential and high oxygen evolution potential. E-Ti/NATO 1.0 -PMS system obtained over 92% BPA degradation within 60 min at 10 mA cm −2 and pH ranging from 4 to 10. Radical scavenging experiments revealed that O 3 in situ generated could directly electro-activate PMS into •O 2 − and 1 O 2 . The E-Ti/NATO 1.0 -PMS process could detoxify the BPA through chain scission, rearrangement and ring opening processes, and exhibited great potentials for application.
研究领域:
环境科学
·
化学工程
·
水处理
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Xuewen Peng,Bin Yang,Danjiang Deng,Zhiwei Cai,Xi Kong,Letao Yang,Jinming Guo
The application of lead-free dielectric ceramics for energy storage has received extensive attention because of their remarkable potential as pulse capacitors in power electronic devices. The current study developed a strategy for improving the energy storage performance of (K 0.5 Na 0.5 )NbO 3 (KNN)-based ceramics by incorporating Bi(Zn 2/3 Nb 1/3 )O 3 to reduce grain size, increase dielectric breakdown strength, and enhance ferroelectric relaxation degree. The resulting 0.87KNN–0.13BZN ceramics exhibited a high energy density (7.4 J/cm 3 ) and moderate energy efficiency (74%) at an ultrahigh electric field (750 kV/cm) as well as excellent optical properties. Therefore, the 0.87KNN–0.13BZN ceramic is a promising candidate for pulse capacitors, providing a feasible approach for the development of new lead-free energy storage materials.
研究领域:
材料科学
·
电子工程
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高影响因子
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