JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Yi Cao,Baoping Lin,Ying Sun,Hong Yang,Xueqin Zhang
La x Sr 1 − x Co 0.1 Mn 0.9 O 3 − δ (0.3 ⩽ x ⩽ 1) perovskite nanofibers (LNF- x ) are firstly prepared by a simple electrospinning method. The microstructure, morphology and electrochemical properties of La x Sr 1 − x Co 0.1 Mn 0.9 O 3 − δ (0.3 ⩽ x ⩽ 1) are systematically studied through scanning electron microscopy (SEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) surface area measurements and electrochemical analyzer etc. The results show that the nanofibers maintain the fibrous structure with perovskite phase after annealed at 700 °C. And with the increase of Sr content in La x Sr 1 − x Co 0.1 Mn 0.9 O 3 − δ (0.3 ⩽ x ⩽ 1), the diameter range of the samples tend to decrease and the roughness of surface enlarge as well. Furthermore, when 1 M KOH electrolyte is employed, a maximum capacitance of 485 F g −1 at a current density of 1 A g −1 is achieved for the LNF-0.7 as electrode material.
研究领域:
材料科学
·
电化学
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JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Mei Li,Yongcheng Zhang,Haiming Li,Hailing Jiang,Wei Han,Yang Sun
In the present work, cyclic voltammetry (CV), square wave voltammetry (SWV) and chronopotentiometry (CP) were used to investigate the electrochemical coreduction behaviors of La(III) and Mg(II) as well as La(III), Mg(II) and Mn(II) on Mo electrode in LiCl + KCl molten salts. CV and SWV results exhibit that the coreduction mechanism of La (III) and Mg(II) on Mo electrode is that La(III) is reduced and Mg–La intermetallic compound is formed, leading to the deposition potential of La(III) shifting to more positive one. The electrochemical signals pertaining to the formation of metallic La, Mg and Mn as well as Mg–La intermetallic compound are also observed by coreduction of La(III), Mg(II), and Mn(II) in LiCl + KCl molten salt on the inert Mo electrode. However, the electrochemical signals associated with the formation of La–Mn and Mg–Mn alloys are not observed, which means that the depolarization effect of La(III) and Mg(II) does not occur on pre-deposited Mn electrode. The Mg–La–Mn alloys were formed by co-deposition of La(III), Mg(II), and Mn(II) on Mo electrode at various concentration ratios of La(III) and Mg(II). The results of scanning electron microscopy equipped with energy dispersive spectroscopy and X-ray diffraction displays that the Mg–La–Mn alloys are comprised of La–Mg compound Mg 17 La 2 , Mg and Mn phases. The concentration ratio of La(III) and Mn(II) has few effects on the alloy composition .
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yun Wu,Rui Yao,Qiang Zhao,Jinping Li,Guang Liu
The development of high-performance and durable Ru-based electrocatalysts in proton exchange membrane (PEM) water electrolyzers for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) remains a huge challenge due to the severe catalyst’s corrosion and high reaction overpotential in acid media. Herein, we reported a synergistic strategy of effectively combining hetero-atom doping and oxygen vacancy in the La-doped RuO 2 nanocrystals, successfully realized by a hydrothermal and followed annealing process aiming for efficiently overall water splitting. The as-obtained La-doped RuO 2 nanocrystals demonstrate superior electrocatalytic performances with ultra-low overpotential of 208 mV for OER and 71 mV for HER at the current density of 10 mA/cm 2 together with robust long-term stability in 0.5 M H 2 SO 4 electrolyte, which are 222 and 15 mV lower in overpotentials than that of bare RuO 2 electrocatalyst. Moreover, the La-doped RuO 2 nanocrystals only require a cell voltage of 1.53 V to drive the overall water splitting reaction and exhibit a remarkable stability. Density functional theory (DFT) calculations further reveal that the synergistic effect of La doping and oxygen vacancy engineering could tune the d-band center of Ru active sites and optimize the Gibbs free energy of intermediate state, thus enhancing the activity of RuO 2 . Such synergistic strategy of aliovalent doping and vacancy engineering for much enhanced acid electrocatalysis may offer important referential values for exploring efficient electrocatalysts towards overall water splitting in acidic media.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Houfeng Zhang,Bojing Sun,Junjie Wang,Qian Zhu,Dongfang Hou,Chen Li,Xiu-qing Qiao,Dong-sheng Li
Optimize the separation and transport mechanism of photogenerated carriers in heterojunction composites, and make full use of the active sites of each material are key factors to enhance photocatalytic activity. Herein, we successfully synthesize defective CdLa 2 S 4 @La(OH) 3 @Co 3 S 4 (CLS@LOH@CS) Z-scheme heterojunction photocatalysts through a facile solvothermal method, which show broad-spectrum absorption and excellent photocatalytic activity. La(OH) 3 nanosheets not only greatly increase the specific surface area of photocatalyst, but also can be coupled with CdLa 2 S 4 (CLS) and form Z-scheme heterojunction by converting irradiation light. In addition, Co 3 S 4 with photothermal properties is obtained by in-situ sulfurization method, which can release heat to improve the mobility of photogenerated carriers, and also be used as a cocatalyst for hydrogen production. Most importantly, the formation of Co 3 S 4 leads to a large number of sulfur vacancy defects in CLS, and thus improving the separation efficiency of photogenerated electrons and holes, and increasing the catalytic active sites. Consequently, the maximum hydrogen production rate of CLS@LOH@CS heterojunctions can reach 26.4 mmol g -1 h −1 , which is 293 times than pristine CLS (0.09 mmol g -1 h −1 ). This work will provide a new horizon for synthesizing high efficiency heterojunction photocatalysts through switching the separation and transport modes of photogenerated carrier.
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PubMed
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
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhiyan Liu,Na Tian,Zhongyu Zhang,Nengneng Li,Yulun Nie,Xike Tian,Chu Dai
The nano zero-valent iron (nZVI)/peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs) are promising for removal of antibiotic contaminants in groundwater. However, the inherent defects of rapid passivation and inactivation limit the efficient and steady application of nZVI. Herein, the lanthanum@nZVI/rGO (La@nZVI/rGO) was synthesized in which nZVI was coated with La and distributed evenly on reduced graphene oxide (rGO) matrix. The introduction of La coating protected the nZVI from direct contact with PMS molecules thus the La@nZVI/rGO appeared efficient and steady activization of PMS to degrade ofloxacin (OFX) without rapid inactivation. The removal rate was promoted to 96.5 % compared with the uncoated nZVI/rGO (only 85.2 %). The degradation reaction represented steady and continuous activation of PMS with pseudo-first-order kinetics (0.0451 min −1 ). While the two-stage kinetics of nZVI/rGO/PMS with initial 0.2581 min −1 and instant 0.0024 min −1 resulted from the rapid inactivation of nZVI. The reaction of La@nZVI/rGO/PMS exhibited minimal leaching of Fe ions (less than 1.8 µg/L) while it reached 6.4 mg/L in nZVI/rGO/PMS. XRD and XPS analyses further demonstrated the excellent durability of La@nZVI/rGO and the obvious passivation of nZVI/rGO. ESR and quenching tests confirmed that La coating regulated the PMS activation and ROS generation mechanism. The degradation was dominated by 1 O 2 -induced non-free radical process in La@nZVI/rGO/PMS system and different from radical oxidation in nZVI/rGO/PMS. Moreover, the dissolved oxygen and XPS analysis revealed the important role of La coating and oxygen vacancy in the catalytic degradation. This work could provide a novel understanding of the nZVI with protective coating in AOPs environmental remediation.
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MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Lin Zizeng,Wang Gu,Wang Chun
A new type of composite coagulant, polyaluminum lanthanum chloride (PALC), was prepared using AlCl 3 ·6H 2 O and LaCl 3 ·7H 2 O as the main raw materials. The optimal preparation conditions were determined with the removal rate of fluoride ions as the evaluation index, which were a basicity degree B value of 1.00 and an Al/La molar ratio of 10:5. Under the optimal preparation conditions, the particle size of PALC was 121 nm and the Zeta potential was 35.3 mV, significantly larger than the corresponding values of 21 nm and 6.9 mV for polyaluminum chloride (PAC), indicating an enhanced particle size and positive charge carrying capacity. The FTIR spectrum of PALC exhibits a La–O-related band at ∼846 cm −1 and a weak feature near 1041 cm −1 attributed to metal–oxygen/metal–hydroxyl (M–O(H)) vibrations in the hydrolyzed Al/La framework, suggesting La incorporation and structural perturbation of the Al-hydroxo polymer network. EDS analysis indicated that the weight percentages of La and Al in PALC were 21.51% and 9.95%, respectively, suggesting that La ions had stronger competitiveness and preferentially combined with –OH to form high-polymer lanthanide products.SEM-EDS analysis suggested a heterogeneous hierarchical distribution of La and Al within the PALC aggregates, with La-enriched inner regions and Al-enriched outer regions. Characterizations by DLS, FTIR, SEM, and EDS demonstrated the successful preparation of PALC, which exhibited stronger adsorption bridging and electro-neutralization capabilities.
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高影响因子
ACS Sensors
·
2025
·
IF 9.1
Haoming Sun,Congling Yin,J. Paul Attfield,Minghui Yang
Resistive sensors are widely used to detect gases, but integrating magnetoresistive effects for enhanced selectivity and sensitivity remains largely unexplored. Here we have investigated several magnetic materials in a metal oxide semiconductor (MOS) sensor, showing that iron oxides can exhibit both positive and negative magnetoresponses at relatively low operating temperatures (120–160 °C), with no simple correlation between magnetoresponse and bulk magnetization, leading to the discovery of La0.8FeO3 as an outstanding material for magnetoresistive gas sensing. Under a 0.9 T magnetic field, La0.8FeO3 shows a 134% increase in response to 40 ppm of NO2 in air. The paramagnetism of oxygen gas is found to provide a substantial magnetosensing contribution, as the use of nitrogen as the background gas diminishes the magnetoresponse of La0.8FeO3 by a factor of 3. Our findings establish magnetic field modulation as a powerful strategy for tuning gas sensor performance, opening new directions in sensing technologies.
研究领域:
材料科学
·
传感器
·
固体物理
·
气体检测
·
纳米技术
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 16
·12158-12167
·
IF 2.019
Zhu Xiying,Zhang Pan,Li Bin,Hu Qun,Su Wenli,Dong Lihui,Wang Fan
La/WO 3 system were successfully built via a simply crystallization precipitation method using sodium tungstate and lanthanum nitrate hexahydrate as precursor. Samples were characterized by powder X-ray diffraction, UV–Vis absorbance spectroscopy, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and N 2 adsorption–desorption isotherms (BET). Results showed that La does not enter into the crystal lattice of WO 3 but located in the interstitial site and accordingly presented as the form of La–O–W in the interstitial site. In addition, doping of La restrict the grain size and the minimum crystal size was 28 nm at La:W = 3:10. Photocatalytic degradation of Rhodamine B showed that the modified samples had better catalytic performance. When La:W reaches 0.3, the La/WO 3 nano-materials exhibits the highest photocatalytic activity, which can be attributed to the synergic effect of the higher BET surface area, surface hydroxyl content and optimum La contents. A possible mechanism for the photocatalytic degradation of RhB has also been provided.
研究领域:
材料科学
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光催化
·
纳米材料
·
环境化学
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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
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高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Shuang Mu,Weilin Huang,Wuhui Sun,Ning Zhao,Mengyang Jia,Zhijie Bi,Xiangxin Guo
The solid polymer electrolyte (SPE) is one of the most promising candidates for building solid lithium batteries with high energy density and safety due to its advantages of flexibility and light-weight. However, the conventional monolayered electrolytes usually exhibit unstable contacts with either high-voltage cathodes or Li-metal anodes during cell operation. Herein, heterogeneous dual-layered electrolyte membranes (HDEMs) consisting of the specific functional polymer matrixes united with the designed solid ceramic fillers are constructed to address the crucial issues of interfacial instability. The electrolyte layers composed of the high-conductivity and oxidation-resistance polyacrylonitrile (PAN) combined with Li 0.33 La 0.557 TiO 3 nanofibers are in contact with the high-voltage cathodes, achieving the compatible interface between the cathodes and the electrolytes. Meanwhile, the electrolyte layers composed of the high-stability and dendrite-resistance polyethylene oxide (PEO) with Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 nanoparticles are in contact with the Li-metal anodes, aiming to suppress the dendrite growth, as well as avoid the passivation between the PAN and the Li-metal. Consequently, the solid LiNi 0.6 Co 0.2 Mn 0.2 O 2 ||Li full cells based on the designed HDEMs show the good rate and cycling performance, i.e. the discharge capacity of 170.1 mAh g −1 with a capacity retention of 78.2% after 100 cycles at 0.1C and 30 °C. The results provide an effective strategy to construct the heterogeneous electrolyte membranes with double-side stable electrode/electrolyte interfaces for the high-voltage and dendrite-free solid lithium batteries.
研究领域:
材料科学
·
电化学
·
能量存储
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高影响因子
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
·
能源工程
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DOI
高影响因子
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