SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Haidong Luo,Shuai Dong,Suhang Chen,Fengqi Zhao,Kangzhen Xu
Photocatalytic-Fenton synergistic degradation of pollutants in wastewater is considered a promising technology for environmental treatment. Herein, FeOOH quantum dots decorated La-doped Bi 4 O 5 I 2 hybrids were prepared using an in-situ deposition strategy and applied for the removal of 2,4-dinitrophenylhydrazine. The FeOOH-1/La 10 -Bi 4 O 5 I 2 sample exhibits the highest catalytic activity in degradation experiments, eliminating 93.8 % of 2,4-dinitrophenylhydrazine within 30 min at a reaction rate constant of 0.117 min −1 . In addition, the impacts of several operational parameters on the catalytic activity were comprehensively examined, including H 2 O 2 concentration, catalyst dosage, reaction solution pH and co-existing ions. In degradation process of 2,4-dinitrophenylhydrazine, the major reactive oxygen species are ·OH and ·O 2 – , with ·OH generated by Fenton reaction. Optical property characterization, cyclic voltammetry tests, and photoelectrochemical measurements confirmed that the FeOOH-1/La 10 -Bi 4 O 5 I 2 composite has excellent light absorption capacity, abundant active centers, and excellent carrier separation efficiency. Finally, the degradation mechanism of FeOOH-1/La 10 -Bi 4 O 5 I 2 composites for 2,4-dinitrophenylhydrazine is rationally discussed based on experimental and theoretical calculations. This study presents a fresh design idea for developing bismuth oxyhalide-based composites with high activity.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Mingyu Liao,Miaomiao Zheng,Gexian Li,Xiaolin Pi,Yuanjie Xiao,Linfeng Zhang,Huadong Wu,Jia Guo
The desulfurization of fuels is a crucial step in the production of clean energy. The design of metal–organic frameworks (MOFs) with bimetallic active sites is a new way to achieve deep oxidative desulfurization (ODS). Traditional methods for synthesizing MOFs involve high temperatures and pressures, which can be hazardous. Oil bath heating provides a safer and more convenient way to synthesize catalysts at a slower heating rate with full uniform heating. In this work, a series of La-doped bimetallic PCN-777(La-Zr) catalysts were synthesized by heating in an oil bath. The microstructures of the catalysts were investigated using various techniques, such as XRD, FT-IR, Raman, BET, SEM, TEM, etc. Compared with PCN-777(H) synthesized by hydrothermal method, PCN-777(O) synthesized by oil-bath heating exhibits a higher specific surface area (2017.01 m 2 /g) and a more homogeneous pore size distribution. PCN-777(0.2La-Zr) demonstrated outstanding catalytic performance in ODS of dibenzothiophene (DBT), which could remove 100 % of DBT within 40 min at 60 ℃ and still exhibited high desulfurization efficiency after 12 cycles. The outstanding catalytic ability of PCN-777(0.2La-Zr) should be related to the synergistic effect of its homogeneous pore channels and unsaturated metal sites. The present study exhibits that bimetallic MOFs have possible application potential in the field of ODS, and offers a novel idea for promoting the catalytic ability of ODS by catalyst synthesis in an oil bath.
研究领域:
催化材料
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能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chaolong Li,Feng Wang,Hao Wang,Boying Wang,Xinru Sun,Xingcan Peng,Weikun Li,Chunli Diao,Haiwu Zheng
To meet the demand for miniaturization and integration of electronic and electrical equipments, developing dielectric capacitors with excellent energy storage properties is of utmost importance. Bi 0.5 Na 0.5 TiO 3 -based ceramics have been investigated extensively for potential energy storage applications. However, its low breakdown strength E b and high remnant polarization P r limit the energy storage density and efficiency ( η ). Therefore, we explored a synergistic design strategy of domain control and grain size adjustment via La doping to successfully synthesize 0.8Bi 0.5 Na 0.5 TiO 3 -0.2NaNbO 3 - x La 2 O 3 (0.8BNT-0.2NN- x La 2 O 3 ) ceramics with superior energy storage properties to overcome above issues. It shows that the composition regulation by antiferroelectric NaNbO 3 results in improved disrupted long rang order ferroelectric domain structure, effectively promoting the formation of polar nanoregions, subsequently weakening P r and enhancing relaxation behavior. The introduction of antiferroelectric NaNbO 3 effectively improves the η of the system. Moreover, the grain size is decreased and densification is enhanced after La tailoring, which is beneficial for the E b and recyclable energy storage density ( W rec ). Finally, a high W rec of 4.40 ± 0.20 J/cm 3 and η of 80.1 ± 2.1% at 450 kV/cm are obtained in 0.8BNT-0.2NN-0.07La 2 O 3 ceramic. Besides, the sample demonstrates admirable temperature stability (25–175 °C) and frequency stability (10–100 Hz). Simultaneously, it displays stable discharge energy density, rapid discharge time of 0.36 μs, and good fatigue endurance (10 5 cycles). The results offer useful guidance for the design of novel ceramic capacitors with comprehensive energy storage performance.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 42
·425205
·
IF 3.399
Qi Chen,Jun Li,Yaohua Yang,Wenqing Zhu,Jianhua Zhang
One-dimensional semiconductor nanofibers are regarded as ideal materials for electronics due to their distinctive morphology and characteristics. In this work, La-doped indium oxide (LaInO) nanofibers are fabricated as the channel layer to reduce O vacancies and the density of interface trap states; this is clearly confirmed by investigating the stability under positive bias stress and the capacitance–voltage for field-effect transistors (FETs). The In2O3 nanofiber FETs optimized by doping with 5 mol% La exhibit excellent electrical performance with a mobility of 4.95 cm2 V–1 s–1 and an on/off current ratio of 1.1 × 108. In order to further enhance the electrical performance of LaInO nanofiber FETs, ZrAlOx film, which has a high dielectric constant, is employed as the insulator for the LaInO nanofiber FETs. The LaInO nanofiber FETs with ZrAlOx insulator have a high mobility of 13.5 cm2 V–1 s–1. These findings clearly indicate the great promise of La-doped In2O3 nanofibers in future one-dimensional nanoelectronics.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Small
·
2025
·
IF 12.1
Xin Chen,Jiahui Wu,Jingyao Zeng,Caiyan Shen,Yuejun Wang,Yangyang Xie,Guorong Hu,Ke Du,Zhongdong Peng,Yanbing Cao
Due to the strong electronegativity of P in the anion group and the strong P─O covalent bond, NFPP exhibits low electronic and ionic conductivity, hindering its rate capability. A doping modification strategy of selecting La 3+ with a large ion radius at Na site has been designed, and the nano-micro architectural Na 4-3x La x □ 2x Fe 3 (PO 4 ) 2 (P 2 O 7 )/C (0≤x≤0.04) cathode material with Na vacancies is successfully synthesized via a scalable preparation route. Introducing positively charged substitutional point defects and charged vacancies through doping La 3+ not only broadens the Na + transport channels but also reduces lattice stress and stabilizes the crystal bulk structure during long-term cycling for La 3+ as pillars. Additionally, high valence La 3+ doping enhances the effective charge carrier concentration and improves material conductivity. Consequently, the kinetic performance of Na + migration is significantly enhanced. The optimal Na 3.91 La 0.03 □ 0.06 Fe 3 (PO 4 ) 2 (P 2 O 7 )/C (NFPP/C-La3) exhibits the best electrochemical performance. The synthesized NFPP/C-La3 exhibits excellent rate performance (99.45 mAh g −1 at 20 C) and long-term cycle stability (92.36% of capacity retention over 1000 cycles at 10 C). These results provide the importance and prospect of the high valence ion doping for NFPP/C with high rate stability.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhihui Xu,Jing Li,Xiaoling Peng,Shan Tao,Jingcai Xu,Bo Hong,Xinqing Wang
In this study, nano-sized La-doped YIG (Y 3-x La x Fe 5 O 12 , x = 0.00, 0.03, 0.05, 0.08, 0.10, and 0.15) were prepared using a reverse co-precipitation method, which were then combined with FeSiCr powder to create a novel FeSiCr/Y 3-x La x Fe 5 O 12 soft magnetic composite (SMC). X-ray Diffraction (XRD) analysis confirmed the successful incorporation of La into the YIG lattice. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) scans demonstrated that a uniform insulating layer of La-doped YIG was effectively coated on the FeSiCr particles. The results revealed that the Y 2.92 La 0.08 Fe 5 O 12 powders showed the highest M s of 22.334 emu/g. Furthermore, the FeSiCr/Y 3-x La x Fe 5 O 12 SMCs exhibited notable improvements both in permeability and core loss with a La doping concentration of x = 0.08 ( P cv = 122.35 mW/cm 3 , μ e = 51.034 at 10 mT and 500 kHz), accompanied by an enhancement of DC bias characteristics. This work optimized the magnetic properties of YIG with La doping and constructed a novel FeSiCr/La-doped YIG SMCs with enhanced high-frequency performance.
研究领域:
材料科学
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磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Wei Zeng,Sheng-Qi Su,Ying-Min Qin,Jing-Zhe Wu,Jiang-Nan Ke,Yong-Gang Sun,Xi-Jie Lin
Ni-rich layered oxides offer numerous advantages such as high discharge capacity, cost-effectiveness, and environmental friendliness, making them the mainstream cathodes for high-energy density lithium-ion batteries. However, their widespread commercialization is hindered by critical challenges in cycling performance, stemming from unstable interface and structure, particularly at elevated charge cut-off voltages. Herein, a dual-modification strategy combining La doping and La 4 NiLiO 8 coating was proposed to synergistically enhance the surface/interface and structure stability of the LiNi 0.83 Co 0.11 Mn 0.06 O 2 (referred to as NCM83) cathode. Unlike conventional methods, a well-designed La(OH) 3 coating pretreatment was employed on the Ni 0.83 Co 0.11 Mn 0.06 (OH) 2 precursor. This pretreatment aimed to facilitate the in-situ formation of La doping and La 4 NiLiO 8 during the lithiation of the coated precursor, while ensuring desired uniformity of the La 4 NiLiO 8 coating and La doping. This dual-modification strategy integrated the advantages of both La doping and La 4 NiLiO 8 coating, demonstrating excellent capability to improve the overall performance of NCM83. The La doping, acting as a pillar, not only strengthened the layered structure of the cathode to mitigate volume changes, but also enhanced Li + diffusion by broadening the c axis spacing. The La 4 NiLiO 8 coating efficiently protected the cathode from H 2 O/CO 2 attack and electrolyte erosion, while also facilitating Li + transport owing to its favorable Li-conductive properties. Such a dual-modification strategy significantly enhanced the electrochemical performance of NCM83, as demonstrated by the excellent long-term cyclic stability, rate capability, and thermal stability at a high charge cut-off voltage of 4.5 V. This work highlighted the benefits of integrating elemental doping and surface coating, while offering a promising synthetic protocol for straightforward and effective dual-modification of various cathodes.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Hao Ruixin,Luo Shanshan,Wang Feiyan,Pan Xinyu,Yao Jing,Wu Jielian,Fang Haihong,Li Wenkui
ZnO quantum dots (QDs) have received much attention as biomarkers and drug delivery systems in cancer treatment, due to their low cost, ease of preparation, and pH-responsive degradation. However, its applications are limited by the low quantum yield and light absorption. In this work, a lanthanum-doped zinc oxide (La-ZnO) QDs-based drug delivery platform was constructed. The results show that 4% La doping is the most beneficial for improving the fluorescent properties of the ZnO QDs. After loading the drug, the cell activity was 15% at ZnO@DOX and 12% at La-ZnO@DOX. According to in vitro and in vivo experiment results, the La-ZnO QDs show enhancement of the antitumor effect. Dual enhancement of fluorescence and anti-tumor effects make La-ZnO QDs promising as a drug delivery system in cancer treatment.
研究领域:
生物医学工程
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纳米医学
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Chao Sun,Liuzhen Bian,Wang Yu,Yunting Hou,Lijun Wang,Lei Xing,Chaoyi Wang,Jun Peng,Jihua Peng,Shengli An
La-doped Sr 2-x La x Fe 1.5 Mo 0.5 O 6-δ perovskite oxides are synthesized and used as a symmetric electrode to evaluate the effect of La on the crystal structure, conductivity, and catalytic activity for O 2 reduction and H 2 oxidation reaction. The electronic doping effect dominates the oversize effect in Sr 2-x La x Fe 1.5 Mo 0.5 O 6-δ oxide, resulting in unit cell volume expansion and decreased conductivity in air. In addition, the introduction of La increases the chemical structural stability of Sr 2 Fe 1.5 Mo 0.5 O 6-δ in reducing condition due to the higher La–O bond compared with Sr–O bond, leading to high catalytic activity for the H 2 oxidation reaction. At 800 °C, the R p values of Sr 1.9 La 0.1 Fe 1.5 Mo 0.5 O 6-δ symmetric cell in air and wet H 2 are as low as 0.075 and 0.21 Ω cm 2 , respectively. Moreover, the peak power densities of 769, 561, 439, and 653 mW cm −2 at 850 °C are obtained when wet H 2 , CO, CH 4, and C 3 H 8 are used as fuels on Sr 1.9 La 0.1 Fe 1.5 Mo 0.5 O 6-δ /LSGM/Sr 1.9 La 0.1 Fe 1.5 Mo 0.5 O 6-δ cell. The symmetric cell also shows excellent stability (>100 h) in wet H 2 /air, implying Sr 1.9 La 0.1 Fe 1.5 Mo 0.5 O 6-δ oxide is a promising symmetric electrode material .
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 12
·9595-9604
·
IF 2.22
Zhou Junyi,Zhang Huimin,Chang Aimin,Zhao Yifeng
La x Bi 1− x FeO 3 (LBFO) materials were synthesized by sol–gel method with x = 0.0, 0.1, 0.2, and 0.3. LBFO ceramics were obtained by rapid liquid phase sintering and conventional sintering, respectively. X-ray diffraction (XRD) and Raman spectroscopy indicated that the phase transition from twisted diamond R3C to orthogonal Pbnm occurs in the course of the increase of La element doping. Scanning electron microscopy demonstrated that the grain size of LBFO ceramics decreased from 10 to 1 μm, with the increase of La ion doping, and the volatilization of Bi decreases from 6.48 to 1.43%. It was found that LBFO ceramics have the characteristic of negative temperature coefficient (NTC), the resistivity (100 °C) is from 4.32 × 10 6 to 2.71 × 10 8 Ω cm, the material constant ( B 100/700 value) is about 6000–9000 K, the activation energy of LBFO is around 0.56 to 0.82 eV, and the temperature range of LBFO is from 100 to 700 °C. The resistivity change of LBFO is less than 1% after 500 h of ageing at 300 °C.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Liguang Dou,Mingkai Fu,Yuan Gao,Lei Wang,Cunji Yan,Tianzeng Ma,Qiangqiang Zhang,Xin Li
Direct hydrogenation of CO 2 to synthetic natural gas at a lower temperature remains a big challenge especially in the presence of H 2 S impurity. This contribution describes the synthesis, structure, morphology and doping effect of a series of robust catalysts for CO 2 methanation under resistive heating, based on Ni-layered double hydroxides (LDH) grown on porous and electrically conductive nickel foam (NF) derived structured catalysts. As a result, LaNi/NF showed the highest CO 2 conversion (55%) and CH 4 formation rate (631.5 mmol·g −1 ·h −1 ) at lower temperature of 250 °C and FeNi/NF gave the optimal conversion at 350 °C (75%, 860.9 mmol·g −1 ·h −1 ), which was superior to the most of recently reported Ni-based supported catalysts. We found that the CH 4 selectivity of the H 2 S (50 ppm) poisoned catalysts was significantly decreased and CO was verified as the main by-product. In this case, LaNi/NF and FeNi/NF still retained much higher conversion rate at 300 °C, 29.8% for LaNi/NF and 27% for FeNi/NF, than the almost deactivated unmodified Ni/NF with maximum 5% CO 2 conversion. The extraordinary activities can be explained as that the dopants can greatly strengthen the metal-support interaction and further enhance the reducibility of active metallic Ni, as XRD, HRTEM, TPR and XPS indicated. Besides of this, DFT calculations demonstrated that the existence of La can greatly promote CO 2 adsorption by lowering the adsorption barrier from 0.55 eV of pure Ni to 0.12 eV, and further inhibit the gaseous H 2 S from chemisorbing on the catalyst surface owning to the relatively unstable Ni-S bond.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2016
·
IF 2.265
Zige Zhang,Guoxiang Li,Zijian Cui,Kaiyue Zhang,Yaqing Feng,Shuxian Meng
Facilitated by TiO 2 particles adsorbing lanthanide ions in hydrosol, La-doped TiO 2 was produced by a hydrothermal method . The structure, optical and photoluminescence properties of down-converting photoelectrode with the La 3+ were characterized by X-ray (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray detector (EDX) and N 2 adsorption-desorption isotherms measurement. The photoelectric conversion efficiency of dye-sensitized solar cells (DSSCs) fabricated with 0.05 g-La/TiO 2 reached 7.02%, which gave an efficiency improved by 10.36% compared with that of cells fabricated from pure TiO 2 . The improvement in efficiency was ascribed to more dyes adsorbed on the surface of TiO 2 .
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）