JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 20
·17461-17473
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IF 2.22
Bhattacharya Anish,Zhang Yin,Wu Haiyan,Chu Xiangfeng,Dong Yongping,Liang Shiming,Xu Jiaqiang,Chakraborty Amit K.
Due to its importance in human health and environmental monitoring, ethanol sensing has generated large research interest across the globe. In this work, we report a simple co-precipitation method to synthesize La-doped BaSnO 3 and evaluate its ethanol sensing properties. Electron microscopy and X-ray diffraction analyses revealed formation of crystalline BaSnO 3 having rod-like shape, few microns in length and 1–2 µm in width. The optimal sensing performance was achieved when operated at 220 °C for 4 wt% La-doped BaSnO 3 microrods for which a response as high as 48 was obtained against 100 ppm of ethanol exposure, whereas the undoped BaSnO 3 exhibited its best performance (although much lower response) at 260 °C. Multiple characterization techniques revealed that the enhancement of the sensor performance by incorporation of La was due to changes in the physico-chemical properties like specific surface area, oxygen content and electronic bandgap of the BaSnO 3 . The high repeatability, high selectivity to ethanol, fast response and recovery times, and low detection limit of 0.01 ppm suggest good potential for the 4% La-doped BaSnO 3 film as a low cost ethanol sensor.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Juan Xie,Fang-Ze Han,Jing-Hui Zhang,Sheng Liu,Yu-Hua Tang,Cheng-Xin Li,Shan-Lin Zhang
La-doped SrTiO 3 (La x Sr 1−x TiO 3 , LST), as the promising ceramic-based interconnect material, usually needs to be sintered in reductive atmosphere at a temperature ≥ 1450 °C, such sintering condition is not friendly to cell fabrication and application. To reduce the sintering temperature of air-sintered LST, seven sintering additives, Bi 2 O 3 , Fe 2 O 3 , Li 2 O, MnO 2 , NiO, V 2 O 5 , and Co 3 O 4 , are added to the LST in this work. The results show that only Co 3 O 4 is conductive to remarkable sintering at the temperatures of 1250 °C. The relative density of LST-3%Co 3 O 4 reaches 92%, while that of the pure LST is only 48%. Moreover, the conductivity of LST-3%Co 3 O 4 achieves 8.2 S/cm at 800 °C in humidified hydrogen, which exceed 5.5 times that of the pure LST. Interestingly, LST-3%Co 3 O 4 exhibits an average TEC of 11.5 × 10 −6 K −1 between 400 and 900 °C, which is very close to that of other components of SOCs .
研究领域:
材料科学
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能源工程
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Zhiyi Zhang,Donglin Guo,Jiazheng Zhang,Changchun Ji,Haining Yu,Xiaojiong Yang
Lanthanum aerogels with high specific surface area up to 288 m 2 ·g −1 are synthesized by a modified sol-gel method combined with supercritical fluid ethanol drying. The lanthanum aerogels can be transformed into porous nanostructure composed of hexagonal La(OH) 3 crystal nanostructures with the specific surface area of 35 m 2 ·g −1 in large quantities after heat treatment at 600 °C in air. The room temperature magnetism of hexagonal La(OH) 3 crystal nanostructures is investigated by the density of states based on first-principles calculations. This work brings a promising route that can quickly produce lanthanum-based porous nanostructures in large quantities.
研究领域:
材料科学
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纳米技术
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计算材料学
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高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2025
·Vol. 35
·期 11
·3919-3932
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IF 4.7
Jia ZHAO,Zhi-tao SONG,Gui-min LU
The alloying process of Mg-La in NaCl-KCl-MgCl 2 -LaCl 3 (NKML) melts during electroreduction was elucidated using electrochemical techniques and deep potential molecular dynamics (DPMD) simulations. In the NKML system, the Mg 2+ /La 3+ electrodeposition on the tungsten (W) electrode at 973 K was found to be a one-step process. The nucleation of metal ions on the electrode surface followed an instantaneous nucleation mode and was not influenced by the alloying process. The redox potential and underpotential deposition behavior of the metal ions in the NKML system were accurately predicted by the DPMD simulations, confirming the alloying process of the Mg-La. Additionally, scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) analysis results confirmed that the cathodic deposits consisted of a bright phase and a dark phase, corresponding to the Mg-La alloys and Mg, respectively. The distribution of electrolytic products suggests that the cathodic deposit initially favors the Mg phase, with the Mg-La alloy forming more easily when the Mg source in the melt is depleted.
研究领域:
电化学
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材料科学
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熔盐化学
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计算材料学
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 12
·5311-5325
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IF 2.7
Pengna Huang,Xianjin Qi,Xiaoxu Duan,Wenqi Jiang,Nina Yang,Gang Zhi,Jianhua Wang
The low adsorption capacity of metal–organic frameworks (MOFs) limits their practical application in high-arsenic wastewater for adsorption owing to their insufficient active sites and suboptimal pore structure. Accordingly, we employed a one-pot hydrothermal method to synthesise mixed-metal La/Zr-MOFs with complex pore structures. Notably, the material possesses both La-BDC and Zr-BDC morphology features and integrates the advantages of monometallic MOFs through a framework symbiotic structure. This complex pore structure promotes the migration and diffusion of arsenic ions in the pore channels, improving the adsorption kinetics. Moreover, mixed-metal functional centres can expose more active sites, which is conducive to enhancing adsorption capacity. Experiments showed that mixed-metal La/Zr-BDC-4 rapidly reached adsorption equilibrium in 60 min, corresponding to a maximum adsorption amount of 694 mg g−1. Batch adsorption experiments and X-ray photoelectron and Fourier-transform infrared spectroscopy analyses revealed that mixed-metal La/Zr-BDC-4 arsenates tend to form internal complexes with each other, suggesting that As(V) adsorption is an exothermic and spontaneous chemisorption process. After four adsorption–desorption cycles, the material maintained an arsenic removal rate of 85%, exhibiting its potential application in wastewater treatment. Therefore, the mixed-metal La/Zr-BDC-4 MOF is a promising material for wastewater treatment.
研究领域:
环境科学
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材料科学
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ibrahim El-Tantawy El-Sayed,Xingmei Lu,Jiayu Xin,Azza A. Al-Ghamdi,Enas A. Imam,Hamada B. Hawash,Ahmed A. Galhoum,S. Wageh
Two α-aminophosphonate anlages (methyl- and phenyl-derivatives, MeAP and PhAP, respectively) were synthesized via an in-situ reaction. Moreover, their corresponding sand nanocomposites, MeAPNC and PhAPNC, respectively, were prepared using an eco-friendly, inexpensive and facile solid-state synthetic route. These materials were extensively characterized by CHNSP/O, XRD, FTIR, SEM-EDX, TEM, and PZC. Lanthanum sorption characteristics were investigated and compared through the study of pH dependence (optimal pH: 4.5), equilibration time (achieved at 120 and 90 min for α-APs and nanocomposites, respectively), and sorption isotherms. The Sips isotherm and pseudo-second-order (PSORE) kinetics were the optimal models for fitting the experimental data. Sorption isotherms showed that methyl-derivatives (≈1.29–1.359 mmol/g) were more effective than their corresponding phenyl-derivatives (≈0.941–0.986 mmol/g) due to steric hindrance, acid-base differences, and inductive effects. Sorbents showed appreciated stability with just a 4.5–10.5 % loss in performance over six reuse cycles using HCl (0.2 M). Notably, sand incorporation slightly increased capacity with half-organic-portion in composites, as well as enhanced kinetics and regeneration efficiency. La(III) sorption is spontaneous, exothermic, and increases randomness across all sorbents. Finally, the prepared sorbents have proven effective sorption for Nd(III) beside La(III) with high selectivity from acidic complex monazite liquor.
研究领域:
材料科学
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环境科学
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化学工程
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
LingYan Liu,ChunHong Zhang,ShuangRong Chen,Lan Ma,YingMei Li,YiFeng Lu
La(OH) 3 -modified canna biochar (CBC-La) was prepared by a coprecipitation method (dipping method), and its phosphate adsorption characteristics were investigated. The results show that the pseudo-second-order kinetics and the Langmuir model can be used to describe the adsorption process with a high level of accuracy. Adsorption equilibrium could be reached at 8 h, at which point the maximum adsorption capacity was shown to be 37.37 mg/g. CBC-La has excellent phosphate adsorption capacity in the middle to low concentrations (≤50 mg/L), and its removal rate can exceed 99 %. CBC-La also has wide pH adaptability (3–9) and a strongly selective adsorption performance. Notably, it can still maintain a removal rate of over 99.8 % in the presence of certain anions (NO 3 − , HCO 3 − , and CO 3 2− ), and the presence of NH 4 + has a synergistic effect on the adsorption process. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements demonstrate that the main mechanisms of CBC-La phosphate adsorption are electrostatic adsorption, ion exchange, ligand exchange and inner sphere complexation.
研究领域:
环境科学
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材料科学
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水处理
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吸附技术
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生物炭改性
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SENSORS AND ACTUATORS B-CHEMICAL
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2013
·
IF 3.535
Hao Shan,Changbai Liu,Li Liu,Shouchun Li,Lianyuan Wang,Xiaobo Zhang,Xiaoqing Bo,Xiao Chi
Pure and La-doped (5 wt%, 7 wt% and 10 wt%) α-Fe 2 O 3 nanotubes are synthesized by an electrospinning method and followed by calcination . The as-synthesized nanotubes are characterized by scanning electron microscope (SEM) and X-ray powder diffraction (XRD). Compared with pure α-Fe 2 O 3 nanotubes, La-doped α-Fe 2 O 3 nanotubes exhibit improved acetone sensing properties at 240 °C. The response of 7 wt% La-doped α-Fe 2 O 3 nanotubes to 50 ppm acetone is about 26, which is 10 times larger than that of pure α-Fe 2 O 3 nanotubes. The response and recovery times of 7 wt% La-doped α-Fe 2 O 3 nanotubes to 50 ppm acetone are about 3 and 10 s, respectively. Moreover, 7 wt% La-doped α-Fe 2 O 3 nanotubes show a good selectivity to acetone.
研究领域:
材料科学
·
传感技术
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Small Structures
·
2023
·Vol. 4
·期 11
·2300175
·
IF 15.9
Wenxian Li,Zulin Sun,Riyue Ge,Jiancheng Li,Yiran Li,Julie M. Cairney,Rongkun Zheng,Ying Li,Sean Li,Qian Li,Bin Liu
MoS 2 with 2D structure shows efficient hydrogen evolution reaction (HER) performance because undercoordinated Mo–S edges have ideal hydrogen adsorption free energy. MoS 2 usually does not satisfy the bifunctional catalysts because of the poor intrinsic oxygen evolution reaction (OER) catalytic activity. Herein, it is proposed to construct heterostructure with OER active components to induce efficient bifunctional catalytic activity along with heteroatom doping to modify the electronic structure to optimize the adsorption and desorption capabilities of reaction intermediates. La-doped Ni 3 S 2 /MoS 2 grown on nickel foam (La-NMS@NF) is synthesized as bifunctional catalyst taking advantage of the excellent OER performance of Ni 3 S 2 . La-NMS@NF evolves into nanoflower-like structures with the addition of La dopant, which provides abundant pore channels to facilitate mass transfer and exposure of active sites. Density functional calculations reveal that the La-doped Ni 3 S 2 /MoS 2 heterointerface can optimize the water adsorption and H * adsorption/desorption, improving the HER performance. The La-NMS@NF exhibits an overpotential of 154 and 300 mV for HER and OER at 100 mA cm −2 in 1.0 m KOH. Herein, a heteroatom-driven heterostructure activation strategy for electron rearrangement and structural evolution in electrocatalysts to decrease energy consumption in overall water splitting is demonstrated.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Mengjuan Cao,Mengkai Yang,Yanyan Xu,Yaqiu Sun,Hongming Sun
It is of great value to explore non-noble and highly active electrocatalysts for oxygen evolution reaction (OER) to obtain reproducible and clean fuels. In this work, a novel La-doped FeNiSe 4 /Fe 0.8 Ni 0.2 Se 2 /NF (La-FeNi-Se/NF) heterostructure catalyst was prepared by a facile selenization treatment to La-doped FeNi Prussian blue analogue(PBA) in-situ grown on foam nickel (NF). The catalytic performance of La-FeNi-Se/NF was significantly enhanced by the doped La 3+ . As a result, the optimized La-FeNi-Se-2/NF exhibits superior alkaline OER electrocatalytic activity (overpotential 158 mV at 10 mA cm −2 and Tafel slope 35.6 mV dec −1 ) than FeNi-Se/NF and Ln-FeNi-Se/NF (Ln = Ce, Gd, Yb), and most reported FeNi-based OER electrocatalysts. The excellent electrocatalytic capability to OER is attributed to the doping FeNi-Se heterostructure with a suitable amount La 3+ . Also, the unique La-FeNi-Se-2/NF flower-like structure composed of nanograins can produce abundant active sites and enhance charge transfer, thereby further improving the catalytic performance. This work highlights an effective chemical and engineering method to prepare efficient electrochemical catalysts.
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RSC Advances
·
2022
·Vol. 12
·期 47
·30522-30528
·
IF 4.036
Weisen Yang,Fengshuo Shi,Wenlong Jiang,Yuhuang Chen,Kaiyin Zhang,Shaoju Jian,Shaohua Jiang,Chunmei Zhang,Jiapeng Hu
A La-based adsorbent was prepared with La(NO3)3·6H2O, 2-methylimidazole and DMF via amide-hydrolysis and used for fluoride decontamination from aqueous water. The obtained adsorbent was lanthanum methanoate (La(COOH)3). The effects of pH value, initial F− concentration and interfering ions on defluoridation properties of as-prepared La(COOH)3 were assessed through batch adsorption tests. The adsorption kinetics, isotherm models and thermodynamics were employed to verify the order, nature and feasibility of La(COOH)3 towards fluoride removal. The results imply that La(COOH)3 is preferable for defluoridation over a wide pH range of 2 to 9 without interference. Simultaneously, the defluoridation process of La(HCOO)3 accords to the pseudo-second order model and Langmuir isotherm, revealing chemical adsorption is the main control step. The maximum fluoride capture capacities of La(COOH)3 at 30, 40 and 50 °C are 245.02, 260.40 and 268.99 mg g−1, respectively. The mechanism for defluoridation by La(COOH)3 was revealed by PXRD and XPS. To summarize, the as-synthesized La based adsorbent could serve as a promising adsorbent for defluoridation from complex fluoride-rich water.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·490-497
·
IF 3.591
Shaoju Jian,Yiting Cheng,Xiaofan Ma,Hongtao Guo,Jiapeng Hu,Kaiyin Zhang,Shaohua Jiang,Weisen Yang,Gaigai Duan
La–Mn bimetal oxide nanofibers, used as an adsorbent for the defluoridation of water, were synthesized by an electrospinning and heat treatment technology. The La–Mn bimetal oxide nanofiber adsorbent with a specific surface area of 35.064 m2 g−1 displayed a good defluoridation performance. Both the adsorption kinetics and equilibrium for fluoride (F−) uptake onto La–Mn bimetal oxide nanofibers were investigated. The kinetic studies established that the adsorption attained equilibrium at about 90 min, and the PSO kinetic model was ideal for the kinetic data under 20 and 50 mg L−1. The Langmuir maximum F− uptake was computed to be 189.39 mg g−1 at 308 K and pH 3. A thermodynamic study affirmed a feasible, endothermic, spontaneous and entropy driven process of F− adsorption towards La–Mn bimetal oxide nanofibers at the studied temperature range. Except for the competitive adsorption of PO43− and F−, the presence of NO3−, CO32−, Cl− and SO42− had little effect on fluoride removal. The La–Mn bimetal oxide adsorbent exhibited a good reusability.
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