JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 24
·28605-28617
·
IF 2.478
Wang Zexing,Guo Biao,Xu Dong,Li Jiamao
We report a successful fabrication of 0.6Ca 0.61 Nd 0.26 TiO 3 –0.4Nd(Zn 0.5 Ti 0.5 )O 3 (hereinafter abbreviated as 6CNT–4NCT) microwave ceramics with good sintering activity and desired dielectric properties from EDTA-gel combustion synthesized powders in this paper. The as-synthesized nanopowders have been characterized by X–ray diffraction (XRD), Fourier transformation infrared (FT–IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques, respectively. The sintering behavior and dielectric performance have been evaluated on the sintered ceramics. The as-obtained product with amorphous structure could be directly crystallized and produced pure 6CNT–4NCT solid solution phase with orthorhombic perovskite structure at a relatively low temperature of 700 °C, without formation of any intermediate phase. TEM images revealed that homogeneous and well dispersed spherical-shaped nanostructure with an average particle size of 23.8 nm was formed at 800 °C. Well-dense 6CNT–4NCT bulk ceramics with 98.8% relative density were obtained at a relatively low sintering temperature of 1225 °C due to high sintering activity of nanopowders. Moreover, the bulk ceramics exhibited a higher quality factor ( Q × f ) value than those prepared via the conventional solid-state reaction method. Desired microwave dielectric properties were achieved at 1200 °C: dielectric constant ε r = 57.2, Q × f = 59,360 GHz, and temperature coefficient of resonant frequency τ f = + 1.95 ppm/°C. This study indicates that the EDTA-gel combustion route is a convenient, low-cost, and interesting route to fabricate high-quality microwave ceramics for practical applications.
研究领域:
材料科学
·
电子工程
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高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Jing Liu,Jingkai Zhou,Zhongjun Zhao,Zhennan Che,Junying Weng,Xiaozhong Wu,Xiaonan Tang,Pengfei Zhou,Jin Zhou,Shuping Zhuo
Sodium manganese layered oxides with mixed structures are regarded as the most attractive cathode materials for sodium ion batteries (SIBs) due to desired electrochemical performance . However, developing novel mixed layered oxides with long cycle life and revealing the formation process of mixed structure is quite challenging. Herein, the novel P2/O3–Na 0.8 Mn 0.55 Ni 0.35 Cu 0.1 O 2 with long cycle life was designed and prepared by solid-state reaction. The formation process of P2/O3 biphasic structure was first revealed by the high-temperature in-situ XRD . More importantly, the XRD Rietveld refinement exhibits that the Na interlayer distance is increased in the O3 phase, which is beneficial to Na + insertion/extraction. Benefitting from the unique P2/O3 biphasic structure and Ni/Cu co-doping, the P2/O3–Na 0.8 Mn 0.55 Ni 0.35 Cu 0.1 O 2 exhibits a high reversible capacity of 148.7 mAh g −1 at 0.1C and a high capacity retention of 94.2% after 200 cycles at 1C. The combination of in-situ XRD and electrochemical analyses suggest the reversible structural evolution and fast Na + diffusion kinetics of P2/O3–Na 0.8 Mn 0.55 Ni 0.35 Cu 0.1 O 2 during the Na + insertion/extraction processes. Furthermore, the Na full cell of hard carbon//P2/O3–Na 0.8 Mn 0.55 Ni 0.35 Cu 0.1 O 2 can deliver a remarkable cycle stability of 97.75% retention after 500 cycles at 1C, implying the application of this novel P2/O3–Na 0.8 Mn 0.55 Ni 0.35 Cu 0.1 O 2 cathode for SIBs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Rui Huang,Hongye Wang,Cheng Tao,Hua Hao,Zhonghua Yao,Hanxing Liu,Minghe Cao
Thin film capacitors with large energy storage density and high breakdown strength are widely used in modern electronic fields. To solve the problems of interface effect and different polarization mechanism between matrix and fillers in conventional heterogeneous structure composite thin film capacitors, a new-type inorganic microcrystal-amorphous composite film of 0.92BaTiO 3 -0.08Bi(Ni 0.5 Zr 0.5 )O 3 (0.92BT-0.08BNZ) are prepared by sol–gel method. The amorphous matrix improving the breakdown strength is introduced into the film by adjusting preparation technology. Moreover, the nano-scale polar microcrystalline regions (fillers) are introduced and uniformly distributed in the amorphous matrix under various annealing temperatures. Through investigating the influence of different amorphous matrix and microcrystal trend on the dielectric and energy storage properties, it is found that synergistic effect between the polarized microcrystalline regions and the amorphous matrix are optimal at an annealed temperature of 550 ℃. The result shows that a high energy storage density of 103.7 J cm −3 and an efficiency of 88.3% are obtained under the electric field of 8.30MV cm −1 . Simultaneously, the excellent dielectric and energy storage stability is achieved in a wide temperature range of 20–200 °C. Conclusively, this microcrystal-amorphous composite film overcome the low energy storage capability and poor thermal stability of conventional composite films and provide a feasible way for preparing high energy storage performance films.
研究领域:
材料科学
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介电材料
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储能技术
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无机非金属材料
·
功能薄膜
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 49
·期 2
·2410-2418
·
IF 5.532
Fang-Ze Han,Jing-Hui Zhang,Shan-Lin Zhang,Cheng-Xin Li
Sr(Ti 1-x Fe x )O 3−δ (STF) perovskite has been developed as one of the alternatives to Nickel-base fuel electrodes for solid oxide electrochemical cells (SOCs) that can provide good tolerance to redox cycling and fuel impurities. Recent results on STF fuel electrodes present excellent electrochemical performance and outstand stability both under H 2 fuel cell mode and H 2 O electrolysis mode, however, the electrochemical characteristics in other fuel gases , such as CO, CO–H 2 mixture, CH 4 , and CO–CO 2 mixture have not been investigated. Herein, we report the electrochemical performance of Sr(Ti 0.3 Fe 0.7 )O 3−δ fuel electrode on La 0.8 Sr 0.2 MnO 3−δ -Zr 0.92 Y 0.16 O 2−δ (LSM-YSZ) oxygen electrode supported SOCs with thin YSZ electrolyte using different fuel gases. At 800 °C, the peak power density slightly decreased from 0.9 W/cm 2 in wet H 2 to 0.68 W/cm 2 in wet CO under fuel cell mode. However, the cell only showed a peak power density of 0.27 W/cm 2 at 800 °C in wet CH 4 , reaching 0.75 W/cm 2 at 850 °C, when the open-circuit voltage increased from 0.9 V to 1.02 V. STF fuel electrode exhibited much worse CO 2 electrolysis performance than steam electrolysis, especially in high CO 2 concentration due to the increased ohmic resistance and electrode polarization resistance.
研究领域:
材料科学
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电化学
·
能源材料
·
固体氧化物电池
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燃料电池
·
电解
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高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 28
·11713-11719
·
IF 3.5
Haoran Yu,Jian Guo,Jiajia Wang,Ji Zhang,Shan-Tao Zhang
As the two typical basic binary solid solutions of the relaxor-PbTiO3 family, Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) has been widely investigated, whereas Pb(Ni1/3Nb2/3)O3-PbTiO3 (PNN-PT) has not. Here, 1.5 mol% Sm-doped (1 − x)Pb(Ni1/3Nb2/3)O3–xPbTiO3, (1 − x)PNN–xPT:0.015Sm with x = 0.33–0.39, ceramics have been prepared and the chemical composition-induced evolution of crystal structure, domain, and electrical properties investigated systematically. With increasing PT content, evolution of the rhombohedral–tetragonal structure was observed. A rhombohedral–tetragonal morphotropic phase boundary occurred around x = 0.36–0.37, which showed a peak piezoelectric property with piezoelectric constant d33 = 531 pC N−1 and planar electromechanical coupling factor kp = 0.37 at room temperature. At the same time, the x = 0.36 composition showed improved ferroelectric behavior with remanent polarization Pr = 13.4 μC cm−2 and coercive field Ec = 3.2 kV cm−1. Interestingly, different from its PMN-PT counterpart, there is no temperature-driven phase transition between room temperature and the Curie temperature for (1 − x)PNN–xPT:0.015Sm. These parameters indicated that the PNN-PT system is worthy of more attention and is a promising platform for further development of high-performance piezo/ferroelectric materials.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Jinxin Xie,Yujue Wang,Haisong Li,Yinqiao Zhang,Minghua Zhou
The mass transfer of O 2 /O 3 was improved at three-phase interface of CB‑PTFE. • CB enabled the synergistic reduction of O 2 /O 3 for •OH generation. • O 3 reduction and catalytic ozonation accelerated phenol mineralization. • Phenol removal and mineralization were 100% and 85% in ten-cycles. The electro-peroxone (E-peroxone) process suffered from the limited mass transfer and insufficient utilization of gaseous O 2 /O 3 mixture. Herein, a hydrophobic carbon black‑polytetrafluoroethylene (CB‑PTFE) electrode was fabricated to construct a gas‑liquid‑solid three-phase interface for improving phenol mineralization. The CB-PTFE electrode exhibited a high contact angle of 143.3°, which enhanced the mass transfer of O 2 /O 3 effectively. Compared with the hydrophilic carbon black‑polyvinylidene fluoride (CB‑PVDF) cathode (72.9°, 51.8%), CB‑PTFE achieved 86.0% TOC removal (0.016 min −1 ) at 120 min in E-peroxone, significantly outperforming sole ozonation (O 3 , 40.0%, 0.004 min −1 ) and electro‑oxidation (EO, 7.2%, 0.004 min −1 ). The greater TOC removal in CB-PTFE/O 3 (66.3%, 0.0095 min −1 ) than that in O 3 indicated that CB-PTFE had catalytic ozonation activity. Electrochemical analysis by a rotating ring‑disk electrode (RRDE) revealed that CB enabled simultaneous 2‑electron oxygen reduction reaction (ORR) to H 2 O 2 (n = 2.23) and efficient 1‑electron O 3 electro‑reduction for increased cathodic current and hydroxyl radical (•OH) generation under the O 2 /O 3 atmosphere. The highest •OH yield (280.5 μmol/L) was obtained using hydrophobic CB-PTFE in E‑peroxone, and theoptimal conditions were the applied current of 20 mA, in‑gas O 3 concentration of 50 mg/L and neutral pH of 7.0. Furthermore, the hydrophobic CB‑PTFE electrode maintained nearly 86.0% TOC removal over ten-cycles with stable structural integrity, despite a slight decrease of hydrophobicity. The reduction of O 2 /O 3 , catalytic ozonation and peroxone reaction were coupled in E-peroxone synergistically, which offered a promising strategy for efficient pollutant abatement. Download: Download high-res image (262KB) Download: Download full-size image
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高影响因子
Materials Today Chemistry
·
2026
·
IF 7.4
Jun Cong,Shaohua Luo,Shengxue Yan
Prime Novelty Statement • Ti 4+ doping successfully induces the transformation of the material from a single P2 phase to a more stable P2/O3 biphasic coexistence structure. • The stabilization mechanism of Ti 4+ doping is elucidated from a thermodynamic perspective using the total cationic potential and high-entropy design theories. • The optimized material achieves a ∼41% reduction in volume strain, significantly boosting structural reversibility and cycling stability. Layered oxides are ideal cathode materials for sodium-ion batteries (SIBs), but their practical application is limited by sluggish ionic kinetics and detrimental phase transitions under high potential. To address this issue, this study proposes a bulk doping modification strategy to optimize the Na 1.1 Ni 2/9 Fe 1/3 Mn 1/3 Cu 1/18 Mg 1/18 O 2 (NaNFMCM) cathode material via Ti 4+ doping. The results demonstrate that an appropriate amount of Ti 4+ doping (x = 0.1) can effectively regulate the total cation potential ( Φ cation ), driving the material to form a stable P2/O3 biphasic coexistence structure with uniform layered flake-like morphology and homogeneous elemental distribution. This structure thermodynamically suppresses irreversible phase transitions, enhances interfacial kinetics by reducing charge transfer resistance, and significantly reduces the lattice volume strain during Na + deintercalation/intercalation (with Δ V max decreasing from 11.48% to 6.79%). Benefiting from the enhanced crystal structural stability, the modified material exhibits a reversible capacity of 147.3 mAh/g at 0.1C. After cycling at various rates, it still delivers 139.6 mAh/g when the rate is returned to 0.1C, corresponding to a capacity retention of 94.8% relative to its initial 0.1C capacity. Combined with density functional theory calculations, this work elucidates the intrinsic mechanism by which doping modulates the crystal structure and optimizes electronic conduction and ion diffusion kinetics at the electronic level. From the perspectives of thermodynamics and structural evolution, this study reveals the stabilization mechanism of Ti 4+ doping, providing a clear design principle for the development of high-performance and high-stability layered oxide cathode materials for SIBs. The Na 1.1 Ti 0.1 (Ni 2/9 Fe 1/3 Mn 1/3 Cu 1/18 Mg 1/18 ) 0.9 O 2 exhibits excellent electrochemical performance: it delivers a reversible capacity of 147.3 mAh/g at 0.1C and maintains a capacity retention rate of 94.8% after 40 cycles. Download: Download high-res image (227KB) Download: Download full-size image
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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 7
·1568
·
IF 4.6
Huohai Yang,Yeqi Gong,Xin Chen,Renze Li,Yuhang Chen,Mingjun Li,Xinrui Tang
The ecological impact linked to hydraulic fracturing, namely with the usage of water and the energy-intensive disposal of flowback fluids, has led to a thorough evaluation of alternative treatment approaches that are more environmentally friendly. The objective of this work was to create coralline-like anatase TiO2/α-Ni(OH)2particles using a hydrothermal approach. The purpose was to improve the efficiency of photocatalysis by increasing the number of oxygen vacancies. An ozone-assisted photocatalytic reaction was used to increase the composite photocatalyst’s degrading efficiency for fracturing flowback fluid. The fracturing flowback fluid’s chemical oxygen demand (COD) degradation efficiency was greatly increased following the introduction of the synergistic treatment system consisting of sedimentation, membrane separation, and ozone photocatalysis. This improvement led to a reduction of 98.42% during a processing time of 90 min, using a Ti/Ni mass ratio of 1:1. This collaborative method partially replaced traditional methods of evaporation concentration and electrochemical degradation, resulting in a 24.18% enhancement compared to individual material catalyst systems. These findings provide crucial insights for improving and optimizing external treatment techniques in shale gas fracturing operations.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jing Sun,Cai-ling Liu,Hong-bo Huang,Xiao-hong Liu,Mei-lan Xie,Ling-ling Liu,Jun-tong Huang,Dui Ma,Zhi-yuan Wang,Shao-hua Luo,Xiao Liang
Layered metal oxides have attracted significant research interest as potential cathode materials for sodium-ion batteries (SIBs), primarily owning to their excellent energy density characteristics and economic viability. Nonetheless, the durability of these materials is limited due to irreversible phase transformations and redox reactions involving lattice oxygen, especially under high-voltage conditions. This results in progressive structural collapse and accelerated capacity degradation. In this study, an innovative three-in-one design approach that combines "high-entropy, dual-phase and Li doping" for layered cathodes is proposed. The study elucidates that the combination of a dual-phase and high-entropy structure effectively improves structural integrity and cycling stability. Furthermore, Li doping promotes the redox reaction of cationic ions and facilitates charge compensation, thereby improving the capacity. The prepared cathode material, P2/O3-Na 0.7 Mn 0.4 Ni 0.27 Li 0.03 Cu 0.1 Fe 0.1 Ti 0.1 O 2 , delivers a high capacity of 139 mAh g −1 , stable cycling capability, superior rate performance (79.1 mAh g −1 at 2000 mA g −1 ) and enhanced air stability. In a full cell configuration combining a high-entropy cathode and a hard carbon anode, outstanding electrochemical performance is demonstrated, with a capacity of 138.4 mAh g −1 and an energy density of 410 Wh kg −1 . This work proposes a novel design strategy for high-performance SIBs.
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高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 10
·6773-6782
·
IF 5.2
Yufan Ping,Weimin Xia,Jiahong Zhou,Xiaofang Zhang,Zhong Li
A lead-free tetragonal-phase (Ba 0.94 Ca 0.06 )(Ti 0.95 Zr 0.05 )O 3 (BCTZ) micro sheet is prepared by molten-salt growth method, which exhibits a polarizing behavior of relaxor ferroelectricity and possesses a high dielectric constant ( ε r ) of ~2400. Subsequently, the BCTZ sheet is evenly doped into ferroelectric copolymer P(VDF-TrFE)55/45 mol% with different mass fractions, and the flexible BCTZ/P(VDF-TrFE) composite films are prepared using a conventional solution casting process. ε r of BCTZ/P(VDF-TrFE) increases with the mass content of BCTZ, and reaches 23.8 in 20 wt% BCTZ sample. Meanwhile, at a high electrical field of 30 MV/m, the strain and electric field of BCTZ/P(VDF-TrFE) are in the opposite direction, indicating a negative value of piezoelectric strain coefficient ( d 33 ) caused by inverse piezoelectric effect. In addition, d 33 of different BCTZ/P(VDF-TrFE) films are fitted using a strain-electrical field curve, which firstly increases and then decreases with increases in BCTZ content. As such, a high d 33 of −47.3 pC/N is obtained in BCTZ/P(VDF-TrFE)15/85 wt% film. Thus, this research concerning the inverse piezoelectric effect may provide a reference for designing a piezoelectric composite using in transducers and actuators.
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高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Li Siwen,Lin Yingzi,Wang Gaoqi,Zhu Suiyi,Liu Gen,Shi Chunyan,Chen Lei
This study researched the formation of disinfection by-products (DBPs) in sulfamethazine (SMZ) chlorination after preoxidation by K2FeO4 and O3 and the influence of preoxidation on cytotoxicity and biological toxicity. Then, the study emphatically analyzed the influencing factors such as NaClO dosage, pH value, reaction temperature, fulvic acid (FA), and bromide and iodide ions. The results showed that preoxidation by K2FeO4 effectively inhibited the formation of DBPs of haloketones (HKS) and trihalomethanes (THMs), with an average inhibition rate of over 60%. The formation of DBPs after preoxidation by O3 was higher than that by K2FeO4; preoxidation by K2FeO4 reduced the influence of NaClO dosage, temperature, and pH value on the production of DBPs after SMZ chlorination. The cytotoxicity and biological toxicity of SMZ chlorination after preoxidation were evaluated and compared by calculating the LC50 value of DBPs and the luminescent bacteria method. The results of both calculation methods showed that the toxicity of DBPs after preoxidation by K2FeO4 was lower than that by O3 preoxidation. K2FeO4 and O3 preoxidation improved the SMZ removal efficiency by 8.41 and 10.49%, respectively, and inhibited the formation of most DBPs, but the preoxidation promoted the formation of highly toxic DBPs (HANs). The toxicity of DBPs formed in SMZ chlorination after preoxidation by K2FeO4 and O3 was slightly higher than that of chlorination disinfection alone, but it was still within the safe range. This study provides more new details about the formation and toxicity changes of DBPs in the process of SMZ chlorination after preoxidation.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 27
·21713-21726
·
IF 2.779
Zeng Jinling,Xu Yiwen,Li Liangjie,Wang Wenwei,Yao Yingbang
In this work, calcium barium zirconate titanate piezoelectric ceramics 0.4Ba(Zr 0.2 Ti 0.8 )O 3 - 0.6(Ba 0.7 Ca 0.3 )TiO 3 ((1− x )BZT- x BCT, abbreviated as x BCZT, x = 0.6) were prepared by conventional solid state reaction method. Different surfactant additives (SDS, CTAB, PEG, and Tris–HCl, respectively) were added to the ball milling process before sintering. Meanwhile, the temperature and dwelling time during the sintering process were also systematically investigated. Their effects on the microstructural, electrical, and piezoelectric properties of the modified ceramics were investigated. It was found that with the Tris–HCl surfactant, the dispersion of the 0.6 BCZT ceramics was the best, and the average particle size was ~82 nm. By using the SDS surfactant, the ceramics showed the highest relative density, i.e., 97%. For the ferroelectric performances, the largest coercive field ( E c = 5.39 kV/cm) was observed in the sample using the SDS surfactant when the sample was sintered at 1300 °C for 6 h. For the dielectric performances, the largest dielectric constant ( ε ) was found to be 35,366.9 for the sample using CTAB surfactant and sintered at 1300 °C for 4 h. We discovered that CTAB-modified ceramics sintered at 1290 °C for 2 h had the highest maximum polarization P s = 24.975 kV/cm and remnant polarization P r = 8.200 kV/cm and sintered at 1300 °C for 4 h produced the highest piezoelectric constant d 33 and dielectric constant of 94 pC/N and 35,366.7, respectively.
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