ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Mingyuan Zhao,Jing Wang,Hao Yuan,Zehan Zheng,Lei Zhao
AgNbO3-based Pb-free antiferroelectric (AFE) ceramics have attracted increasing interest owing to their excellent potential in energy storage applications. Herein, a high recoverable energy storage density (Wrec) of 7.62 J/cm3 is realized in La-doped AgNbO3 ceramics prepared via tape casting. The high Wrec is attributed to high breakdown strength Eb of 380 kV/cm induced by dense microstructure as well as fine grain size and enhanced AFE stability stemming from M2 phase and reduced tolerance factor t. The high Wrec exceeding 6 J/cm3 was maintained in a wide temperature range of 20–150 °C and exhibited frequency stability with less than 8% variation in a range of 1–200 Hz. The discharge energy density Wd exhibited temperature stability at 30–110 °C with less than 9% variation. Our research provides a good method for producing AgNbO3-based ceramics having high energy storage performances.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Hui Liang,Jing Li,Xinhui Shen,Benliang Cao,Junxiang Zhu,Baozhang Geng,Sihang Zhu,Wenjiang Li
Amorphous catalysts have a large number of catalytic active sites. Here, we report a magnesium composite trace lanthanum catalyst (La@Mg), in which La and Mg layers form amorphous Mg–La compound on the surface of layered Mg. The test shows this La@Mg has hydrogen storage capacity of about 7.6 wt% and hydrogen desorption of 7.2 wt%, higher than that of crystalline La@Mg and sole Mg, rapid absorption/desorption kinetic and stable reversible absorption/desorption cycles. La@Mg exhibits an optimistic hydrogen storage performance than Mg-based materials previously reported in the literature. Combined with theoretical calculations, it is shown that the amorphous Mg–La has an catalysis on hydrogen storage performance of La@Mg system, which contributing to the dispersion of Mg and providing channels for hydrogen diffusion, facilitating hydrogenation by accelerating H atoms diffuse between the subsurface and the surface. This work provides experiment and mechanism guidance for the development of efficient hydrogen storage materials.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Bin Li,Chong Yang,Rongbo Ma,Bin Cao,Chaoyong Deng,Weichao Huang
Bi 3+ -doping luminescent materials have recently evoked considerable interest in versatile applications. In this work, we have developed a series of Bi 3+ -activated CaSrMSbO 6 (M = La, Gd, Y) phosphors with double perovskite structures, exhibiting blue emission from 350 nm to 500 nm. The emission spectral position and intensity of Bi 3+ ions can be tuned by changing excitation wavelength and doping concentrations. The relationship between the local crystal field environment and the luminescence properties is comprehensively analyzed. Importantly, optical temperature properties of CaSrLaSbO 6 : Bi 3+ were investigated and were found to reach a maximum relative sensitivity of 4.57 % K −1 at 298 K. Furthermore, the anti-counterfeiting ink was prepared using CaSrLaSbO 6 : Bi 3+ phosphors, and it showed tunable emission under different light stimulation. These results indicate that CaSrLaSbO 6 : Bi 3+ phosphors have application potential in optical temperature sensing and anti-counterfeiting.
研究领域:
材料科学
·
光学
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Zheng Zhu,Linlin Qin,Yulong Liu,Qiqi Zhang,Peng Cheng,Wenyan Liang
Lanthanum (La) is constantly used in phosphorus removal due to its high affinity with phosphate. Herein, a novel La/Al bimetallic organic framework was developed to improve the usage efficiency of La species. The effects of metal ratio, pH value and competitive anions were investigated, through which the adsorption mechanism was further explained. Results showed that when the doped La:Al ratio was 1:3, the absorbent (La 1 Al 3 -BTC) achieved the most excellent adsorption capacity of 210.3 mg P·g −1 and usage efficiency (P/metal ratio = 1.09). La 1 Al 3 -BTC can adapt to the wide pH range and multitudinous coexisting ions in real water, and its adsorption process was in accordance with Langmuir and pseudo-second-order models. Surface morphology of materials transformed from rod-like crystal to amorphous structure as the increase of Al doping. La replaced some Al atoms and embedded in Al-BTC skeleton. The specific surface area raised from 9.27 m 2 ·g −1 of La-BTC to 257.01 m 2 ·g −1 of La 1 Al 3 -BTC. The main mechanism for the adsorption of phosphate was the inner-sphere complexation occurred in the La active sites. Electron migration between different metals enhanced the adsorption process. Density-function theory (DFT) calculation well matched the experimental phenomenon. Overall, the development of La 1 Al 3 -BTC presented new potential applications for enhanced phosphorus removal and provided new insights for the design of La-based adsorbents.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Fei Yang,Denghui Shao,Taokai Liang,Mengzhe Hou,Bihui Zhang,Yizhuo Li,Weijin Hu,Xiaofang Li,Yanchun. Hu,Dawei Zhang,Xianwei Wang
The Pb 1–1.5x La x Zr 0.95 Ti 0.05 O 3 films with different La 3+ contents were successfully prepared on the LaNiO 3 /SiO 2 /Si substrates by sol-gel method. The effect of La 3+ doping on the microstructure, electrical properties, and energy storage performance of the films are systematically investigated. It is found that the introducing of La 3+ with a smaller tolerance factor could enhance the lattice distortion and compressive stresses, leading to smaller grain size, slimmer electric hysteresis loops, and lower phase transition field hysteresis. As a result, a relatively high energy storage density of 30.2 J/cm 3 together with the energy storage efficiency of 62.2% has been achieved in Pb 0.82 La 0.12 Zr 0.95 Ti 0.05 antiferroelectric thin films with the optimum doping content. This improvement is largely attributed to the enhanced breakdown field strength from 1442 kV/cm to 1564 kV/cm as a result of grain size reduction. Our results demonstrate the crucial role of decreased tolerance factor in stabilizing the antiferroelectric phase and enhancing the phase transition electric field, and provide an effective route to enhance the energy storage performance of antiferroelectric thin films.
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Journal of the Taiwan Institute of Chemical Engineers
·
2020
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IF 4.794
Xuan Jing,Li Chen,Yaxin Wang,Yunyun Wang,Xinyan Yang,Jiangdong Dai,Xiaohui Dai,Yinhua Jiang,Yan Liu,Zhanchao Liu,Yongsheng Yan
Efficient incorporation of large-mesoporous silica materials with the film structure to fabricate hybrid film materials has been promising for water treatment. The modified large-mesoporous silica films possessed superior adsorbability, but the poor mechanical behavior hampered the application of adsorbents. We proposed the fabrication of La modified rGO/silica mesoporous films for efficient phosphate removal to deal with this problem. Consider the problem of plugging of mesopores , La/Si molar ratio of 1/10 was a conventionally reported loading ratio in the literatures. In this paper, the film materials also retained pore size (19.97 nm) comparable with that of the pristine large-mesoporous silica films (20.53 nm) when the La/Si molar ratio was 1/5. In the adsorption experiments, the maximum phosphate capacities achieved 55.045 mg g −1 . And multi-adsorption mechanisms were confirmed by the results of analysis. The formation of rod-like crystal LaPO 4 was the main pathway in the adsorption process. The film material might create a new way for phosphate removal.
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ADVANCED FUNCTIONAL MATERIALS
·
2018
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IF 13.325
Cai Wei,Liu Kaihua,Gao Rongli,Deng Xiaoling,Chen Gang,Fu Chunlin
Bismuth ferrite (BiFeO 3 , short for BFO) is an important room-temperature single phase multiferroic materials. To further improve electric properties of BFO, La 3+ was introduced. Bi 1− x La
x
FeO 3 ( x = 0–0.12) thin films were fabricated by sol-gel method. The microstructure, optical and electric properties of Bi 1− x La
x
FeO 3 thin films have been investigated. XRD results show that Bi 1− x La
x
FeO 3 thin films is rhombohedral distortion perovskite structure and the addition of La 3+ can inhibit the formation of impure phase. The substitution of La 3+ for Bi 3+ on A sites can restrain the growth of grain and improve the roughness of thin films. The band gap of Bi 1− x La
x
FeO 3 thin films is less than that of BFO thin films, and its band gap decreases first and then increases as the content of La 3+ increases, which results from both Burstein-Moss effect and impurity level. A larger amount of La 3+ ( x = 0.12) can make leakage current of BFO thin films obviously decrease. Moreover, the remnant polarization and coercive electric field of Bi 1− x La
x
FeO 3 thin films increase with the increasing of La 3+ content. It results from the decrease of oxygen vacancy and effects of grain size. Keywords Bismuth ferrite Lanthanum Optical Dielectric Ferroelectric
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DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 7
·2435-2443
·
IF 4.099
Yuhua Chen,Feng Zhang,Qian Wang,Huiming Lin,Ruihan Tong,Na An,Fengyu Qu
A facile methodology is presented to construct a multifunctional nanocomposite that integrates photothermal therapy and specific drug release into a single nanostructure. Firstly, magnetic Fe3O4@polydopamine core–shell nanoparticles (Fe3O4@PDA) were synthesized via a reversed-phase microemulsion approach. By varying the amount of DA, Fe3O4@PDA with a particle size of 28–38 nm can be obtained. To further ensure the monodispersity, biocompatibility and specific uptake, PEG and lactobionic acid (LA) were grafted onto Fe3O4@PDA (LA-Fe3O4@PDA-PEG), whose fast photothermal conversion is derived by the combination of Fe3O4 and PDA with high near infrared (NIR) absorption. Then, doxorubicin hydrochloride (DOX) was adopted as the typical anticancer drug, which was loaded onto LA-Fe3O4@PDA-PEG via electrostatic and π–π stacking interaction. The release kinetics investigation further demonstrated the acid/heat-triggered DOX release. HepG2 cells (hepatocellular cell line) were used as the target cancer cells, and the fast uptake was due to the nanoparticle size and abundant asialoglycoprotein receptors on HepG2 cells. Besides, an external magnetic field also can improve the uptake, especially when the magnet is placed at the bottom of the cell disk. The enhanced specific cytotoxicity toward HepG2 cells was also ascribed to the synergistic effect of chemo- and photothermal therapy. Based on the novel properties, the LA-Fe3O4@PDA-PEG-DOX nanocomposite showed its potential application in hepatocyte therapy.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Qiang Guo,Yu Qiao,Yonghou Xiao,Yi Pan,Yushan Li,Xu Liu,Gaohong He
Cuprous ion modified molecular sieves have been considered as promising CO adsorbents in gas separation or purification industry. However, it persists as a significant challenge to overcome the unfavorable effect of water vapor in the work environment on gas adsorption and separation. Herein, we propose a synthetic strategy using rare earth element La as an additive to form La O La coordination bonds followed by surface silanization treatment to construct a hydrophobic Si O Si barrier to significantly improve the stability of Cu + under humid atmosphere. By successively introducing La 3+ and Cu + into zeolite 5A, CuCl/LaA adsorbents were prepared via ion exchange and solid dispersion methods. And then by silanization modification using toluene as solvent and butyltrichlorosilane (BTS) as hydrophobic agent, hydrophobic CuCl/LaA-BTS adsorbents were prepared. Dynamic adsorption investigation demonstrated that the as-prepared CuCl/LaA-BTS adsorbents possessed hydrophobic surface and consequently the adsorption capacity of CO was enhanced significantly under humid atmosphere. The CO adsorption breakthrough capacity over CuCl/LaA-BTS attained 0.34 mg/g, which was 5.7 times higher than that of zeolite 5A at 40 °C, atmospheric pressure and a relative humidity of RH = 55 %. Moreover, the CO adsorption capacity of CuCl/LaA-BTS retained 0.31 mg/g after four cycle regenerations. This work provides an effective and novel route for synthesizing highly stable cuprous ion modified zeolite adsorbents.
研究领域:
材料科学
·
气体分离技术
·
表面改性
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Fangfei Lv,Yiming Yan,Zhongcai Ma,Yibing Guo,Wei Wu,Suwen Li,Lili Huo
The sluggish kinetics of anodic oxygen evolution reaction (OER) has been the restricted factor for large-scale hydrogen production from water electrolysis. Exploring highly efficient OER electrocatalysts is essential to varied renewable energy storage and conversion devices. In this work, we designed and fabricated subminiature tetranickel nitride (Ni 4 N) nanocrystallines modulated by trace amounts of rare earth (RE) encapsulated in ultrathin mesoporous nitrogen-doped carbon shells (RE-Ni 4 N@mesoNC) derived from ultrathin layered hydroxide nanosheets as highly active and stable electrocatalysts for the OER in water spilling. In view of the advantages of excellent electrical conductivity, adjustable surface electronic structure and a high density of utilizable active sites, the as-synthesized RE-Ni 4 N@mesoNC electrodes exhibit more superior performance than RE-free Ni 4 N@mesoNC and commercial IrO 2 . The optimal La–Ni 4 N@mesoNC achieved a lower overpotential of 330 mV at the current density of 10 mA cm −2 and a smaller Tafel slope of 66 mV·dec −1 . And the La–Ni 4 N@mesoNC electrode also exhibit the excellent stability of continuous 72 h i-t tests and the overlapped polarization curve before and after 3000 consecutive CV cycles.
研究领域:
材料科学
·
电化学
·
能源存储与转换
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xiyuan Tao,Li Yang,Jiali Liu,Zihao Zang,Peng Zeng,Changfei Zou,Lingguang Yi,Xiaoyi Chen,Xiaolin Liu,Xianyou Wang
Garnet-type Li 7 La 3 Zr 2 O 12 (LLZO) is a promising solid-state electrolyte (SSE) for next generation lithium batteries due to its high Li + conductivity and stability against lithium metal, especially the Li 7−3x Ga x La 3 Zr 2 O 12 (Ga-LLZO) is most valuable because of its high ionic conductivity (> 1 ×10 −3 S cm −1 ). However, it is difficult to prepare high-quality Ga-LLZO by the traditional air ambient sintering. Herein, we develop a simple and efficient rapid ultra-high-temperature sintering (RUHTS) method to prepare high-conductivity Ga-LLZO ceramic SSE. It has been found that the as-prepared Ga-LLZO ceramic SSE with the composition of Li 6.25 Ga 0.25 La 3 Zr 2 O 12 exhibits high relative density of 99%, good ionic conductivity of 1.48 × 10 −3 S cm −1 and large critical current density of 0.5 mA cm −2 after sintering at 1200 °C for 2 min. In addition, the Ga-LLZO SSE shows good electrochemical stability and interfacial compatibility against Li metal. The assembled Li-Li symmetric cell represents a small interfacial impedance of 37 Ω cm 2 . In the same time, the Li/Ga-LLZO/LE+LMNCO full battery has a total impedance of 205 Ω cm 2 , and can deliver a first discharge capacity of 235.1 mAh g −1 at 0.5 C, and the capacity retention rate is 88.3% after 100 cycles. This indicates that the as-prepared Ga-LLZO has good application prospect in the Li-metal solid-state batteries (LMSSBs). Moreover, this method does not require the use of mother powder during preparation process, which will effectively reduce the waste of raw materials, save manufacture costs and be beneficial to quantity production of Ga-LLZO ceramic electrolyte.
研究领域:
材料科学
·
电化学
·
电池技术
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Lin Mei,Chao Feng,Yuzhong Wang,Qiang Yu,Wenjie Xin,Weifeng Chu,Yanan Wang,Xiangxue Zhu,Shenglin Liu,Hongxia Wang,Longya Xu
Synthesis of acetonitrile (ACN) by way of ethanol dehydroamination process was performed over copper-, zinc-, nickel-, and cobalt-based catalysts in a fixed-bed reactor, by which 20Co/Al2O3 was found to be the best one and ready for subsequent La, Ce, and Pr doping. Then, catalytic tests and a series of characterizations such as XRD, XRF, XPS, TEM, TG-DTA, IGA, NH3-TPD, and N2 adsorption–desorption were carried out. The results demonstrate that rare-earth-modified 20Co/Al2O3 catalysts have improved the catalytic performance for ethanol dehydroamination remarkably; the addition of La leads to better dispersion of cobalt species, the higher surface area of 20Co/Al2O3 catalyst, and fast adsorption for ACN, as well as better resistance to carbon deposition. In the meantime, the La-doped catalyst seems to prefer the route of acetaldehyde imine to ACN rather than to ethylamine, and consequently, a highly selective synthesis of ACN with excellent catalytic stability was obtained with the formation of ethylamine being suppressed..
研究领域:
催化化学
·
材料科学
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危险品化学品经营许可证（带存储）