ACS Applied Energy Materials
·
2021
·
IF 6.024
Shidong Song,Yongqiang Xu,Yanli Ruan,Hong Wang,Dequan Zhang,Joykumar Thokchom,Donghai Mei
Amorphous Li–La–Zr–O (LLZO) solid-state electrolyte thin films are promising alternatives to the well-established lithium phosphorus oxynitride (LiPON) electrolyte for all-solid-state lithium batteries due to their potentially higher Li-ion conductivity and stability. Herein, the enhancement methodology in the ionic conductivity of amorphous LLZO-based thin films is investigated. By doping with Ta, the conductivity of the amorphous LLZO film at 30 °C (3.9 × 10–7 S cm–1) can be enhanced by up to an order of magnitude (2.6 × 10–6 S cm–1), ascribed to tuning Li conduction in local near-order LLZO nanodomains. On that basis, an isomeric Li–La–Zr–Ta–O (LLZTO) amorphous–crystalline composite thin film is prepared via incorporating cubic LLZTO particles into the amorphous LLZTO matrix. The composite film with 10 wt % cubic LLZTO filler can further achieve an ionic conductivity of 0.8 × 10–5 S cm–1 at 30 °C, which is comparable to the best values obtained for the state-of-art LLZO-based thin films. Li transport through the well-connected cubic LLZTO filler network and along the interfaces between the crystallites and the amorphous matrix in the LLZTO composite thin film may offer fast and long-range Li-conduction pathways, which supplement the ionic conduction in the amorphous matrix with short-range-ordered and long-range-disordered structures.
研究领域:
材料科学
·
能源存储
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 25
·44694-44701
·
IF 5.6
Honglei Yuan,Huizhong Ma,Gaoliang Wang,Huanxia Jia,Liwei Wang
This study systematically investigates the structural and luminescent characteristics of LaSc 3 (BO 3 ) 4 :x %Cr 3+ and La (1-y) Gd y Sc 3 (BO 3 ) 4 :1.0 %Cr 3+ phosphors. X-ray diffraction confirms the formation of a pure hunter-type structure for all samples, with Cr 3+ occupying Sc 3+ sites and Gd 3+ substituting La 3+ , inducing lattice contraction. Luminescent analysis reveals that LaSc 3 (BO 3 ) 4 :Cr 3+ exhibits an emission at 980 nm under 430 nm excitation, attributed to the 4 T 2 → 4 A 2 transition of Cr 3+ in a weak crystal field. The substitution of Gd 3+ enhances photoluminescence intensity by 2.15-fold, and blue-shifts emission to 938 nm because of increased crystal field splitting and structural rigidity. The broadened full width at half maximum is also formed due to the enhanced degree of disorder in GdSc 3 (BO 3 ) 4 . Thermal stability studies show that GdSc 3 (BO 3 ) 4 :Cr 3+ retains 49 % intensity at 540 K, outperforming LaSc 3 (BO 3 ) 4 :Cr 3+ (41 %), supported by higher activation energy (ΔE = 0.338 eV vs. 0.296 eV). The improved thermal resistance is linked to lattice rigidity and reduced electron-phonon coupling. NIR-pc-LEDs fabricated with GdSc 3 (BO 3 ) 4 :Cr 3+ demonstrate superior radiant flux (68.7 mW at 200 mA) compared to La-based devices. These results highlight the critical role of host lattice engineering in optimizing Cr 3+ luminescence for high-power NIR applications.
研究领域:
材料科学
·
光学材料
·
固态化学
·
光子学
·
发光材料
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RARE METALS
·
2026
·Vol. 45
·期 7
·e70404
·
IF 12.1
Wentian Zhang,Qian Yang,Shen Zhang,Long Zhang,Shun Li,Jianming Zhang,Hiromichi Ohta,Yuqiao Zhang
en This link goes to a English section zh This link goes to a Chinese section The development of high-performance photodetectors critically relies on innovative interfacial band engineering, a strategy that enables the synergistic enhancement of photocurrent and drastic suppression of dark current. Herein, a self-powered ultraviolet (UV) photodetector is demonstrated based on a NiO/La-doped SrSnO 3 (LSSO)/Nb-doped SrTiO 3 (NSTO) dual heterojunction. Benefiting from the reinforced interfacial potential barriers and multiple built-in electric fields at both the NiO/LSSO and LSSO/NSTO interfaces, the device achieves highly efficient charge separation while effectively inhibiting carrier leakage in the dark. Consequently, the photodetector exhibits an ultra-low dark current of 0.18 pA at zero bias. Under 254 nm UV illumination, the device delivers a high responsivity of 41.81 mA W −1 , a specific detectivity of 7.87 × 10 12 Jones, a photocurrent-to-dark-current ratio as high as 4.4 × 10 4 , and rapid response times (rise/fall) of 2.89/13.93 ms. These results underscore the advantages of the dual-heterojunction architecture in boosting photoelectric conversion efficiency and suppressing noise, thereby providing a robust strategy for high-performance, oxide-based self-powered UV photodetection. 摘要 en This link goes to a English section zh This link goes to a Chinese section 高性能光电探测器的研发关键在于创新性的界面能带工程,该策略能够协同增强光生电流并显著抑制暗电流。本文报道了一种基于NiO/La:SrSnO 3 (LSSO)/Nb:SrTiO 3 (NSTO)双异质结结构的自供电紫外光电探测器。得益于NiO/LSSO和LSSO/NSTO界面处增强的界面势垒和多重内置电场,该器件在有效抑制暗态下载流子泄漏的同时,实现了高效的电荷分离。结果表明,该探测器在零偏压下表现出0.18 pA的极低暗电流。在254 nm紫外光照射下,器件的响应度达到41.81 mA W −1 、探测率为7.87 × 10 12 Jones,光暗电流比高达4.4 × 10 4 ,并具备2.89/13.93 ms (上升/下降时间)的快速响应特性。上述结果充分表明,双异质结结构在提升光电转换效率和抑制噪声方面具有显著优势,为构建高性能氧化物自供能紫外光电探测器提供了一种有效的设计策略。
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NANO
·
2025
·
IF 1.1
Xiangyu Zhao,Huike Zhang,Weili Yang,Pengfei Liu,Mingqin Zhao,Mingyue Zhang
Reasonable manufacturing of efficient and nonprecious metal electrocatalysts for oxygen evolution reactions (OER) is crucial for renewable energy development for addressing energy crises and environmental issues, which is a key step in reducing the cost of green hydrogen production. In this study, we report a lanthanum (La)-doped nanofiber cobalt spinel catalyst, synthesized via the electrospinning of a zeolite imidazolate framework (ZIF) embedded in polymer fibers, and evaluate its electrocatalytic performance for OER. The results show that in acidic electrolytes (0.1 M HClO 4 ) , the catalyst exhibits a low overpotential of 353 mV under conditions of 10 mA ⋅ cm − 2 and the Tafel slope is 90.57 mV ⋅ dec − 1 . Further investigation reveals the impact of the La molar ratio in La@Co-ZIF on catalytic performance, highlighting the importance of optimized design in improving activity. The excellent electrocatalytic activity of La@Co-ZIF further demonstrated its enormous potential as an efficient electrocatalyst for sustainable energy applications. These results provide important design strategies and forward-looking insights for the development of novel platinum-group-metal (PGM)-free catalysts, particularly for future hydrogen production in water electrolysis.
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RARE METALS
·
2026
·Vol. 45
·期 4
·e70203
·
IF 12.1
Haifeng Tian,Haowei Huang,Zhiyu Chen,Fei Zha,Hongshan Chen,Ruiying Ding,Yu Zhang,Hao Wei,Yuzhong Mao,Irshad Hussain,Zhicheng Zhang
en Thermally driven hydrogenation of CO 2 to light olefins (C 2 = –C 4 = ) using metal oxide-zeolite tandem catalysts is an effective strategy for achieving carbon neutrality. However, progress in this area is constrained by zeolite pore transport limitations, acid-site inactivation, and surface carbon poisoning. To address these issues, we replaced conventional zeolites with La-modified ZIF-8 and combined it with hollow cubic In 2 O 3 to develop a novel In 2 O 3 -La-ZIF-8 tandem catalyst. Our study investigates the effects of the hydrothermal reaction temperature used for synthesizing In 2 O 3 and the La content in ZIF-8 on catalytic performance. We also found that the oxygen vacancy (O V ) concentration in In 2 O 3 can be substantially regulated by adjusting the hydrothermal temperature. The In 2 O 3 sample with the highest O V concentration not only promotes the formation of reaction intermediates but also markedly reduces the energy barrier of the rate-determining step in methanol synthesis. Comprehensive characterization and simulation analyses indicate that La incorporation enhances the thermal stability of ZIF-8, improves its ability to adsorb and activate reaction intermediates, and effectively adjusts its acid-base properties. Under a reaction pressure of 3.0 MPa and a temperature of 360°C, the hollow cubic In 2 O 3 -La-ZIF-8 tandem catalyst achieves 23.5% CO 2 conversion with 65.3% C 2 = –C 4 = selectivity. 摘要 zh 利用金属氧化物-分子筛串联催化剂 , 通过热驱动将CO 2 转化为低碳烯烃(C 2 = –C 4 = ) , 是实现碳中和的有效策略。然而 , 该领域的发展受到分子筛孔道传质限制、酸性位点失活及表面积碳等问题的制约。为解决这些难题 , 本研究以La修饰的ZIF-8替代传统分子筛 , 并将其与空心立方体In 2 O 3 相结合 , 开发了一种新型的In 2 O 3 -La-ZIF-8串联催化剂。系统探究了In 2 O 3 水热合成温度以及ZIF-8中La含量对催化剂性能的影响。通过调节水热温度可显著调控In 2 O 3 中的氧空位浓度 , 具有最高氧空位浓度的In 2 O 3 样品不仅能促进反应中间体的生成 , 还可显著降低甲醇合成过程中决速步骤的能垒。综合表征与模拟分析表明 , La的引入增强了ZIF-8的热稳定性 , 提升了其对反应中间体的吸附与活化能力 , 并有效调节了其酸碱性质。在3.0 MPa、360°C的反应条件下 , 空心立方In 2 O 3 -La-ZIF-8串联催化剂上实现了23.5%的CO 2 转化率与65.3%的低碳烯烃选择性。
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JOURNAL OF CATALYSIS
·
2026
·
IF 6
Yao Zhang,Yanju Lu,Jiaxi Li,Xiaolei Zhang,Guoyin Zhu,Xincheng Cao,Junming Xu,Jianchun Jiang
Hydrogenated rosin is emerging as a critical material in emerging high-value sectors such as electronic packaging, high-performance adhesives, pharmaceuticals, and food industries, owing to its excellent stability, oxidation resistance, and weatherability. In this study, we report for the first time the use of NiCu nanoparticles supported on La 2 O 2 CO 3 as a highly efficient catalyst for the selective hydrogenation of rosin acids. Remarkably, the NiCu nanoparticles supported on micron-spheres composed of La 2 O 2 CO 3 nanorods demonstrated exceptional catalytic performance, achieving complete conversion of rosin acids with a selectivity of 82.4% toward tetrahydroabietic acid under mild conditions of 220 °C and 6 MPa H 2 pressure. The high performance of NiCu@La 2 O 2 CO 3 is attributed to the electronic interaction between Ni and Cu, while La 2 O 2 CO 3 , acting as a strong electron donor, further modulates the crystal structure of the NiCu alloy. Density functional theory calculations reveal that NiCu@La 2 O 2 CO 3 significantly alters the adsorption configuration of dihydroabietic acid molecules, shifting from a parallel flat-lying adsorption to a tilted adsorption with a certain angle. This optimized adsorption energy of dihydroabietic acid on the active sites simultaneously exposes its specific C=C double bonds, thereby guiding the hydrogenation reaction along a high-selectivity pathway toward tetrahydroabietic acid.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Wen Zhang,Xiyue Zhang,Xiangjun Zheng,Fei Gao,Sheng Ji,Yangping Zhang
Developing non-noble metal catalysts with low cost, ease of scalability, high efficiency and stability under high current densities is crucial for the commercial production of green hydrogen in anion exchange membrane water electrolyzers (AEMWEs), which are limited by the slow kinetics of the anodic oxygen evolution reaction (OER). High-entropy layered double hydroxides (HE-LDHs) with the merits of optimized electron structures and multiple tunable active sites have emerged as a research hotspot. Herein, we successfully synthesized La-doped FeCoNiMn-LDH with remarkable performance, requiring only an ultralow overpotential of 162 ± 5.57 mV to achieve a current density of 100 mA cm −2 , outperforming the vast majority of non-noble metal-based electrocatalysts. Additionally, the as-prepared FeCoNiMnLa-LDH maintaining stable operation at 500 mA cm −2 for over 1000 h. Importantly, in AEMWEs, FeCoNiMnLa-LDH achieves an ultralow potential of 1.69 V at 1 A cm −2 and operates stably for 600 h without significant activity decay. In Operando EIS reveals the dynamic reconstruction of M 2+ into high-valent MOOH species during the OER, where synergistic multi-metal interactions and La doping-induced electronic modulation facilitate the formation of highly active γ-NiOOH and CoOOH, thereby significantly boosting catalytic activity. This study provides a foundational reference for the design and application of advanced high-entropy electrocatalysts.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Shifan Lu,Qiang Fan,Yingli Liu
For self‑biased circulators, oriented Ba 1-x La x Fe 12-x Al x O 19 (x = 0.1–0.5) hexaferrites were fabricated by solid‑state reaction. Partial substitution of Ba 2+ by La 3+ and Fe 3+ by Al 3+ progressively contracts the lattice, increases grain size, and induces local lattice distortion, evidenced by Raman peak shifts and broadening. Magnetic properties evolve in two distinct trends: remanence and coercivity decrease monotonically; saturation magnetization M s , anisotropy constant K 1 , and anisotropy field H a increase to a peak at x = 0.4 ( M s = 78.91 emu/g, H a = 12.94 kOe) and then decline. The non‑monotonic M s arises from competition between magnetic dilution by Al 3+ and La 3+ ‑induced lattice contraction that enhances superexchange interactions. The M r / M s decrease is dominated by the weakening of exchange coupling due to non-magnetic Al 3+ substitution, with additional contributions from grain growth-induced multi-domain formation. The enhanced H a originates from lattice contraction strengthening spin‑orbit coupling at the 2b site, with the decline at x > 0.4 correlated with Raman‑detected local disorder accumulation. Through a finely-resolved composition gradient (∆x = 0.1), this study decouples the competing mechanisms and identifies the optimal composition at x = 0.40, underscoring the value of fine compositional tuning for precise property optimization. This work provides a systematic understanding of the competing mechanisms that determine the magnetic performance, offering guidance for composition design of oriented hexaferrites for self‑biased circulator applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zexian Xu,Wen Zhu,Weixing Liu,Wenbo Liu,Zican Liu,Ken Chen,Kang Li,Peiqi Lun,Jiawei Zhu,Muhammad Idrees,Saima Batool
The garnet-type Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) is considered a promising solid-state electrolyte (SSE) due to its high ionic conductivity and electrochemical stability. However, the surface of LLZTO easily reacts with H 2 O and CO 2 in the air, forming a passivation layer of Li 2 CO 3 . This reaction further deteriorates the interface between LLZTO and the Li anode, resulting in poor wettability. Consequently, significant gaps form between LLZTO and the Li anode, leading to uneven deposition of Li during the cycling. Li dendrites can grow into these gaps, eventually penetrating the electrolyte and causing a short circuit in the battery. In this study, a surface modification method is investigated, where a thin film of titanium is deposited onto the surface of LLZTO electrolyte tablets using magnetron sputtering. The effects of magnetron sputtering deposition titanium film process parameters—chamber pressure, bias voltage, and temperature—on the electrochemical properties of button cells were investigated. The results indicated that LLZTO electrolyte tablets coated with titanium exhibited low interfacial resistance, high cycle stability, and significant inhibition of Li dendrites under optimized conditions of 1.0 Pa chamber pressure, 100 V bias voltage, and 150 ℃ temperature. Under these conditions, the interface resistance decreased significantly from 1437.9 Ω to 190.19 Ω. Additionally, the Li symmetric cell assembled with the titanium-coated LLZTO electrolyte tablet demonstrated stable cycling for over 1200 h at 25 ℃ under a current density of 0.1 mA·cm −2 .
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GEOSTANDARDS AND GEOANALYTICAL RESEARCH
·
2018
·Vol. 43
·期 1
·93-111
·
IF 3.929
Shenyang Y. Zhang,Hongluo L. Zhang,Zhenhui Hou,Dmitri A. Ionov,Fang Huang
A rapid sample preparation procedure is described to determine trace element compositions of peridotites using LA-ICP-MS. Peridotite powders were fused with albite in a molybdenum–graphite assembly to obtain homogeneous glasses. Best conditions for the fusion procedure (heating at 1500–1550 °C for 10–15 min with a sample-to-flux ratio of 1:2) were constrained with melting experiments on two USGS reference materials, PCC-1 and DTS-2B. Mass fractions of first series transition elements, Ba and Pb, in quenched glasses of PCC-1 and DTS-2B are consistent with published data within 10% RSD. Three spinel peridotite xenoliths from eastern China were analysed following both our method and conventional solution ICP-MS. Compared with solution ICP-MS, the relative deviations of our method for most elements were within 10%, while for the REE, Ta, Pb, Th and U, the relative deviations were within 20%. In particular, volatile elements (e.g., Pb and Zn) are retained in the glass. Compared with conventional wet chemistry digestion, our method is faster. Additional advantages are complete sample fusion, especially useful for samples with acid-resistant minerals (spinel and rutile), and long-term conservation of glasses allowing unlimited repeated measurements with microbeam techniques. The same approach can be used for analyses of other mantle rocks, such as eclogites and pyroxenites.
研究领域:
地球化学
·
矿物学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhaoyubo Zeng,Yunzhong Liu,Yingxiang Zhang,Zhiguang Zhou,Xiaohui Liu
While ensuring good resistance to hydrothermal or high-temperature aging of zirconia ceramics, constant attempts to understand and improve their fracture toughness remain the focus. In this work, 0.1–0.3 mol.% of La 2 O 3 was doped into a 1.5 mol.% Y 2 O 3 +5.5 mol.% CeO 2 co-stabilized zirconia ceramic (C1.5Y5.5Ce) based on a coating route. Compared with conventional 3 mol.% Y 2 O 3 stabilized zirconia (C3Y), their microstructure, mechanical properties, and corresponding toughening mechanisms were studied by XRD , SEM, Raman spectroscopy , XPS and TEM . Non-transformable t’ zirconia phase was found in both Ce–Y and Ce–Y–La co-stabilized ceramics. Tetragonal to monoclinic (t-m) phase transformation toughening combined with ferroelastic domain toughening is considered to be the primary toughening mechanism of these ceramics. Doping of La 2 O 3 causes significant grain refinement, which increases the hardness and facilitates the ferroelastic domain switching. The oxygen vacancy concentration and the valence state of cerium are also affected, resulting in a change in the tetragonal stability. Although with a lower t-m transformation rate, the 0.3 mol.% La 2 O 3 doped C1.5Y5.5Ce possessing the smallest grain size shows a high fracture toughness of 10.17 MPa m 1/2 , which is about 23% higher than that of C3Y.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2021
·
IF 5.234
Weiqiang Hu,Lei Wang,Zongqing Ma,Liming Yu,Yongchang Liu
This work proposed an innovative technology to fabricate Mo–La–O nanoparticles strengthened Mo alloys with ultrafine nano grains via freeze-drying and low temperature sintering . These novel nano Mo–La–O particles including La 7 Mo 7 O 30 , La 5 Mo 3 O 16 , La 6 Mo 2 O 15 , La 5 Mo 4 O 12 , La 4 Mo 2 O 11 and La 2 (MoO 6 ) remain coherent or semi-coherent interfaces with Mo matrix to strengthen their phase boundaries. Moreover, nano Mo–La–O particles enriched in excess oxygen absorb nearby impurity oxygen and then lead to the purification of Mo matrix. Furthermore, the low temperature sintered Mo–La x Mo y O z alloys possess high relative density (98.1%), which is due to the high sintering activities of ultrafine powders (56 nm). Comparing with available literature which involves oxide-dispersion-strengthened-molybdenum alloys (ODS-Mo), the freeze-dried Mo–La x Mo y O z alloys in our work possess the finest grain size (440 nm), the finest oxide particle size (mainly <5 nm), the highest hardness (495 HV 0.2 ) and high strength (1201 MPa) at 30% deformation.
研究领域:
材料科学
·
冶金学
·
纳米材料
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粉末冶金
·
先进制造
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高影响因子
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