Journal of Physical Chemistry C
·
2024
·
IF 3.3
Jing Pan,Yongde Yan,Yuan Deng,Xuepeng Wang,Li Ding,Xin Kong,Yun Xue,Fuqiu Ma,Kai Zhu,Wei Liu
Electrolyte is considered to be one of the key factors affecting electrolysis in the rare earth and their alloys industry. Generally, the fluoride system is chosen as the electrolyte for industrial production. However, the molten salt electrolysis method for fluoride-oxide systems is not well understood and has not been systematically studied at this stage. In order to supplement this part, lanthanum (La) ions have been chosen as the research object in this paper to systematically investigate the preparation of La–Ni alloy from LaF3–LiF-CaF2–La2O3 molten salt. A series of electrochemical methods were used to investigate the mechanism and kinetic properties of La(III) reduction on W and Ni electrodes. The electrochemical reduction properties and kinetic parameters of La were obtained. La–Ni alloy was prepared by potentiostatic electrolysis, and it was verified by detailed analysis through characterization methods. On this basis, LaNi5 intermetallic compound was successfully prepared on Ni electrode. This study provides valuable theoretical guidance for the development of La alloy preparation with fluoride salt systems in industry.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yiqing Liu,Cheng Tao,Ying Zhou,Jinglong Fan,Hua Hao,Zhonghua Yao,Hanxing Liu,Minghe Cao
Dielectric capacitors are highly valued in power electronics for their high power density and stability. However, achieving high energy density in small devices under moderate electric fields remains challenging. In this study, La 2 O 3 -coated (Na 0.5 Bi 0.5 ) 0.4 Sr 0.6 TiO 3 ceramics (La 2 O 3 @NBST) were successfully synthesized via chemical coating method. In addition, the influence of La 2 O 3 content on the microstructure, dielectric and energy storage properties of the ceramics were systematically studied. Due to the effectively refinement of grain size and promotion of uniform, dense microstructure formation by La 2 O 3 coating, both the resistivity and breakdown strength of ceramics have been significantly enhanced. Moreover, the remarkable reduction in the remnant polarization ( P r ) stems from strengthened relaxor behavior, which is a consequence of La 2 O 3 -induced phase transition from the rhombohedral ( R 3 c ) to the tetragonal ( P 4 bm ) phase. Notably, a discharge energy density of 2.01 J/cm 3 and an energy efficiency of 78% could be achieved in the 4 wt% La 2 O 3 @NBST ceramic, along with good cycling stability after 10 5 cycles and temperature stability from 30 °C to 120 °C. This work establishes a theoretical basis for the chemical coating method in optimizing lead-free energy storage ceramics, showcasing its application potential in high-performance dielectric capacitors.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 45
·2205121
·
IF 19.924
Lixuan Zhang,Kai Wang,Yanqi Jia,Liping Fang,Chen Han,Jiaquan Li,Zongping Shao,Xinyong Li,Jieshan Qiu,Shaomin Liu
Piezoelectric polarization portrays a promising technology to regulate the photogenerated charge carrier separation and transfer behaviors, and the design of multifunctional catalysts with piezo-phototronic effect is a key step. One strategy is to prepare a composite catalyst combining the ideal properties from each individual component. Herein, a facial dopant-induced self-assembling strategy is reported to fabricate an ultracompact nanocomposite (LaFeO 3 /ZnFe 2 O 4 /La 2 O 3 ) with enhanced efficiency for piezo-photocatalysis. The composite is synthesized at 800 °C from the one-pot method, thus the self-constructed interface is created during multi-phase formation, providing the intimate grain-to-grain contact between the semiconductive LaFeO 3 and piezoelectric ZnFe 2 O 4 /La 2 O 3 phases. In such a composite, a synergistic effect for oxygen activation is realized via the effective manipulation of the photogenerated charge carrier separation and spatial transportation through the vibration-created piezopotential. A high piezoelectric coefficient (d 33 ) up to 826 pm V −1 and a superior H 2 O 2 yield of 403 µmol g −1 h −1 (in open air and pure water) are achieved on the optimized composite, outperforming most of the reported lead-free piezo-photocatalyst. The ultracompact composite is very robust without any decay in H 2 O 2 -delivering capability after many cyclic tests. This study provides a universal strategy for the rational design of high-performance piezo-photocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
Additive Manufacturing
·
2025
·
IF 11.1
Yuhua Heng,Yiwei Mao,Kunhao Feng,Jiangtao Sun,Jianan Zheng,Yingmi Xie,Qingsong Wei
Binder jetting (BJ) holds immense potential for manufacturing complex tungsten heavy alloy (WHA) parts with high efficiency and low cost. However, sintered BJ WHA parts often face the challenges of coarse grains and poor mechanical performance, which can be attributed to low green density and stringent sintering conditions (e.g., high temperature or long duration). In WHA powder metallurgy, oxide nanoparticles are often introduced to pin grain boundaries, limiting grain growth during the sintering process and thereby enhancing the mechanical properties. This work introduced oxide nanoparticles through the binder, which could effectively avoid the problems of uneven mixing, process complexity and impurity introduction. La(NO 3 ) 3 binder, the key component of which was La(NO 3 ) 3 , a water-soluble inorganic metal salt, would generate nano-La 2 O 3 (200 nm) in situ among the base powders during pretreatment, aiming at refining W grains and enhancing mechanical performance. The effects of La(NO 3 ) 3 binder on the microstructure and properties of sintered BJ WHAs were systematically investigated and compared with those printed by the commercial binder. The average W grain size of sintered samples was 26.85 μm, finer than that printed by the commercial binder (34.53 μm). The ultimate tensile strength and yield strength of sintered samples were 926.54 MPa and 661.72 MPa, which were 8.46 % and 5.86 % higher than those printed by the commercial binder, respectively. Furthermore, the contributions of fine-grained strengthening, dispersion strengthening, solid-solution strengthening, and dislocation strengthening to the yield strength of sintered WHAs printed by La(NO 3 ) 3 binder were all enhanced. This work offers a promising approach for grain refinement and performance enhancement of BJ metallic materials.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xifei Yin,Yinghui Sun,Yanbin Zhang,Xiaolong Wang,Ying Li,Tong Xu,Jie Bai
Dry reforming of methane (DRM) is a chemical reaction with great potential to convert CH 4 and CO 2 into valuable syngas. However, catalyst deactivation due to sintering and coking is a major obstacle for practical applications. Here, we synthesized a hollow tubular Ni/La 2 O 3 -ES catalyst via electrospinning (ES) method that surpasses conventional Ni/La 2 O 3 catalysts in both activity and stability. The ES-driven architecture creates confinement-stabilized Ni nanoparticles with improved metal-support interaction and spatial uniformity, achieving 93 % CO 2 conversion and 85.0 % CH 4 conversion at 800 °C for 20 h of continuous operation, providing long-lasting performance with no accumulation of carbon deposition. The carbon removal ability is strengthened in the Ni/La 2 O 3 -ES catalyst as evidenced by the CH 4 -CO 2 -TPSR experiments. Ni/La 2 O 3 -ES catalyst prefer to produce more active intermediates b-HCOO* as indicated in in situ DRIFTS spectra. The b-HCOO* species served as the key reactive intermediate that facilitated both CO 2 activation and the oxidative transformation of CH 4 -derived carbonaceous intermediates on catalytic surface. Additionally, the catalyst prepared by electrospinning method promoted lattice oxygen release and oxygen vacancy formation, thereby exhibiting superior catalytic activity and stability.
研究领域:
催化化学
·
能源化学
·
材料科学
·
表面科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2026
·
IF 3.3
Peng-Cheng Cai,Xin-Wen Zhou,Xiao-Ming Dang,Zhen-Qi Shi,Guo-Hua Zhang
Tungsten (W) is regarded as a key candidate material for extreme service environments. However, its relatively high ductile-to-brittle transition temperature (DBTT) and rapid grain growth at elevated temperatures have long restricted its engineering applications. In present work, an integrated route combining bottom‑up and top‑down approaches was employed. Ultrafine W-1 wt.% La 2 O 3 powders were synthesized via a novel carbothermic pre-reduction followed by hydrogen deep deoxidation process. Subsequent hydrogen pre-sintering and spark plasma sintering (SPS) enabled rapid densification and controlled deformation at a relatively low temperature, producing a fine-grained W alloy (0.77 μm) with distinct substructural features. Nanoscale La 2 O 3 particles were uniformly distributed throughout the matrix. During high-pressure SPS, the formation of a weak γ-fiber texture ({111}//ND) promoted cooperative activity among multiple {111} 〈110〉 primary slip systems. La 2 O 3 particles located at grain boundaries effectively suppressed boundary migration through Zener pinning, while intragranular nanoparticles coordinated dislocation motion via combined Orowan bypassing and shearing mechanisms. The multiscale structural synergy enabled a favorable strength-ductility balance between 200 and 600 °C. The alloy exhibits noticeable plastic deformation at 200 °C, with distinct yielding (972.3 MPa) and uniform strain‑hardening behavior. This study elucidates the coupling among grain refinement strengthening, Orowan strengthening and dislocation forest hardening, thus providing a new design strategy for achieving high-temperature microstructural stability and mechanical reliability in W alloys.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2018
·Vol. 36
·期 8
·873-878
·
IF 2.524
Yongchao Fang,Xiufang Cui,Zhaobing Cai,Chang Wang,Guo Jin
One of the problems limiting the application of Stellite 6 coating is the residual stress resulting in cracks in the coating easily. In order to reduce the residual stress and increase the nano-indentation hardness, La 2 O 3 was added to Stellite 6 coating in this study, and the influence on the microstructure, nano indentation hardness and residual stress of the coatings were investigated by scanning electron microscopy (SEM) with energy dispersive spectrum (EDS), X-ray diffraction (XRD) and nano-indentation tester. Results indicate that the addition of La 2 O 3 leads to the phenomenon that the dendrite is partly transformed into the equiaxed grain, which results in the grain refinement. The nano-indentation hardness of coatings is improved, which is attributed to the fine-grain strengthening and dispersion strengthening effect of La 2 O 3 . With the addition of La 2 O 3 , the residual stress in coatings is decreased significantly. Especially, when the content of La 2 O 3 is 0.8 wt%, the nano indentation hardness increases by 1.31 times and residual stress decreases to 20 percent, compared with coating without La 2 O 3 .
研究领域:
材料科学
·
表面工程
·
金属学与金属工艺
·
力学性能
·
显微组织分析
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Qianchun Zhang,Yuxian Zhao,Xuan Shang,Shan Tang,Li Jiang,Yun Wu,Qin Zhou,Shiqin Li
Methallyl alcohol (MA), which is a common volatile organic compound, in vapor form can cause respiratory irritation, headache, nausea, and vomiting. Therefore, the development of a highly selective, excellently sensitive, and efficient sensor for rapidly identifying trace MA is essential. In this study, a La 2 O 3 /α-Al 2 O 3 composite with excellent cataluminescence (CTL) activity in the presence of MA was successfully synthesized. The CTL sensor based on as-prepared La 2 O 3 /α-Al 2 O 3 exhibited high selectivity for MA vapor as well as response and recovery times of 1 and 6 s, respectively. Under the optimal conditions for MA detection, the La 2 O 3 /α-Al 2 O 3 sensor exhibited a linear range of 0.0025–0.50 mg/L (correlation coefficient, R 2 = 0.998) and a low limit of detection of 0.61 μg/L at a signal-to-noise ( S/N ) = 3. The La 2 O 3 /α-Al 2 O 3 sensor was also used to determine the MA content in spiked samples and volatile gases generated from a medicine cabinet. Excellent recoveries in the range of 82.5–107% were obtained, with a corresponding relative standard deviation ( n = 5) in the range of 2.1–4.7%. Furthermore, the CTL sensing mechanism was investigated through density functional theory and high-performance liquid chromatography-ultraviolet analyses.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 15
·7202-7211
·
IF 3.925
Zijing Wang,Shixiang Lu,Wenguo Xu,Ziwen Wang,Hao Zuo
Stable electrode materials with suitable electrochemical performance and high specific power are essential for the application of supercapacitors. A combination of La2O3, Co3O4, and graphene on nickel foam (LCGN) was prepared by hydrothermal synthesis and heat treatment to construct a three-dimensional flower-like structure. The synergistic effect between La2O3, Co3O4, and graphene dramatically improves the electrode stability. Owing to the special three-dimensional flower-like structure that improves ion diffusion and prevents structural collapse during charging and discharging, the prepared LCGN composite exhibits an excellent specific capacitance of 2945.11 F g−1 (2.95 F cm−2) at a current density of 1 A g−1 and excellent rate retention of 79.20% at 30 A g−1. Moreover, the LCGN//LCGN symmetric supercapacitor shows excellent performance with a specific capacitance of 403.92 F g−1 at 1 A g−1, with power density and energy density (12 000 W kg−1 at 53.9 W h kg−1), reflecting its industrial potential. Under the condition of 10 A g−1 current density, the capacitance retention rate is still extremely high, 89.3% after 30 000 continuous charge and discharge cycles, which certifies the promising potential of LCGN for high-performance energy storage devices.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xuewen Luo,Lei Xu,Leba Yang,Jiawen Zhao,Tewodros Asefa,Rongliang Qiu,Zhujian Huang
Non-free radical photocatalysis with metal oxide catalysts is an important advanced oxidation process that enables the removal of various emerging environmental pollutants, such as tetracycline. Here, four hexagonal La2O3 photocatalysts with different densities of oxygen vacancy and crystalline features are synthesized and then further treated by ball milling. Ball milling of these La2O3 photocatalysts is found to increase the amount of oxygen vacancies on their surfaces and thereby the amount of 1O2 species produced by them. The photocatalytic degradation of TC by these La2O3 photocatalysts depends on the oxygen vacancies present on them. Furthermore, the ones with a strong (101) diffraction peak remove tetracycline from water systems largely with 1O2 and •OH species, whereas those with a weak (101) diffraction peak do so mainly via 1O2 and direct electron transfer (DET) process. Their overall catalytic properties are also studied by density functional theory calculations. Moreover, the organic products produced from tetracycline by La2O3 photocatalysts containing a strong (101) diffraction peak are found to be less toxic than those produced by La2O3 photocatalysts containing a weak (101) diffraction peak. This study also provides convincing evidence that the structures of La2O3 determine the species that is produced by it and that end up mediating photocatalytic reaction pathways (i.e., free radical versus non-free radical) to degrade an emerging environment pollutant.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Ming Zhang,Guoli Fan,Liyuan Yuan,Feng Li
Bioethanol upgrading to higher alcohols (C4–10–OH) involves several sequential reaction steps occurring at multiple different active sites. Therefore, precisely engineering heterogeneous catalysts with appropriate local chemical structures of active sites and spatial environments is highly desired for efficient ethanol tandem conversion. Herein, we constructed a novel Cu-based catalyst featuring atomically dispersed Cu sites confined in a hierarchical silicalite-1@La2O3@silicalite-1 architecture, where single Cu atoms were confined in the micropores of surface silicalite-1 (S-1) zeolite nanoislands dispersed on the outer La2O3 layer encapsulating a hollow S-1 zeolite core. By modulating the content of Cu and La species, such a constructed multihierarchical Cu@S-1@La2O3@S-1 catalyst exhibited excellent performance in ethanol conversion to higher alcohols, along with an impressively high ethanol conversion of 74.9% and C4–10–OH selectivity of 85.0%, as well as an unprecedentedly high production rate of higher alcohols (10.575 mol·gCu–1·h–1) at 275 °C, far exceeding those over state-of-the-art Cu-based catalysts. It was elucidated that surface single-atom Cu sites first notably promoted the adsorption and activation of ethanol and thus initiated its dehydrogenation to produce acetaldehyde, and subsequently, acetaldehyde intermediates migrated to the outer La2O3 layer featuring abundant medium-strength basic and acidic sites, thereby facilitating the condensation of acetaldehydes and their further dehydration. This work provides an innovative approach for rationally designing high-performance supported Cu catalysts with a spatiotemporal decoupling structure applied in advanced heterogeneous tandem catalytic processes through the design of site-specific confinement within hierarchical structures.
✓ 已验证
DOI
PubMed
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2026
·
IF 3.1
An Zhuoqing,Liang Weiwen,Gao Yuan,Chen Jiajing
The viscosity of the CaO–MgO–Al 2 O 3 –SiO 2 system containing La 2 O 3 and Fe 2 O 3 was measured by rotation, hot-stage microscopy and hot-stage load methods to investigate the rheological behavior across multiple temperature ranges. In-situ high temperature Raman spectroscopy was employed to quantitatively analyze the microstructure. The results show that with the La 2 O 3 /Fe 2 O 3 ratio varying from 2/0 to 0/2, the viscosity decreases gradually through the multiple temperature ranges, and the viscous flow activation energy also gradually decreases. As the ratio of La 2 O 3 /Fe 2 O 3 decreases, the relative contents of Q 0 , Q 1 and Q 2 increase gradually, and the relative contents of Q 3 and Q 4 decrease significantly. This indicates that both La 2 O 3 and Fe 2 O 3 act as network modifiers and simplify the glass network structure, resulting in a decrease in the degree of network polymerization and viscosity over the multiple temperature range. Compared to La 2 O 3 , Fe 2 O 3 is a more effective network modifier, as it breaks up the silicate network more efficiently and results in a lower overall viscosity. In addition, the microstructure of the melts was quantitatively analyzed by NBO/ T , and a quantified relationship among viscosity, microstructure and temperature was given.
✓ 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）