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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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
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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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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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xianchu Wang,Hao Lu,Jingjing Xie,Zhaoyong Zou
The development of oxygen evolution reaction (OER) electrocatalysts is crucial for advancing water electrolysis applications. To overcome the activity and conductivity limitations of transition metal catalysts, we synthesized a methanol-regulated Co-doped La-based metal-organic framework (La-MOF) precursor and pyrolyzed it to obtain Co-doped La 2 O 3 . The introduction of methanol optimized the pore structure and specific surface area of the MOF precursor, facilitating the exposure of active sites and electrolyte transport. The incorporation of Co promoted the formation of crystalline La 2 O 3 during pyrolysis, significantly enhancing material stability. Additionally, it induced the generation of oxygen vacancies, improving charge transfer capability. The synthesized material exhibits high catalytic activity with an overpotential of 253 mV at 10 mA·cm -2 and a Tafel slope of 78.4 mV·dec -1 , while maintaining nearly constant current density during continuous operation for 12 hours, outperforming RuO 2 . These results undoubtedly highlight the potential of La-MOF-derived materials in electrochemical applications for developing high-performance catalysts across diverse fields.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Bihong Li,Yijie Ding,Weizhong Zheng,Weizhen Sun,Ling Zhao
Zeolites have emerged as the highly potential solid catalysts in isobutane (C4) alkylation due to their adjustable acidity and structural properties. The introduction of rare earth metal or transition metal can effectively regulate the acidic site distribution and strength of beta zeolite. The structural stability, acid properties and catalytic performance of low Si/Al ratio beta zeolites functionalized with various lanthanum and copper loadings are systematically investigated for the C4 alkylation through experimental characterization and catalytic evaluation. It is revealed that the optimal metal loading can impart superior acidic properties to beta zeolites. Lanthanum modification increases the total amount of Brønsted acid sites (BAS), and enhances the population of moderate and strong BAS compared to copper modification. Catalytic evaluation demonstrated that copper-modified beta zeolites achieve a higher research octane number (RON) up to 93 for alkylate, but exhibit a shorter catalyst lifetime. Lanthanide-modified counterparts exhibit a catalytic lifetime of 320 min and 65 wt% trimethylpentane (TMPs) selectivity with relatively stable RON of 90 during a prolonged stable operation, and meanwhile, the optimal lanthanide-modified HB-1 zeolites (0.35 wt% La@HB-1) demonstrate high level of catalytic lifetime and TMPs selectivity after three cycle experiment. The information obtained from this work will contribute to a better understanding of the metal-modified low-Si/Al-ratio beta zeolites for catalyzing the C4 alkylation.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 28
·59375-59382
·
IF 5.6
Chunxiao Lu,Pengyu Li,Ye Zhao,Qiwei Zhang,Shuai Li,Yong Li,Zhongzhi Wang,Liwen Zhang,Xihong Hao
Ferroelectric transparent ceramics serve as pivotal functional materials with inherently tunable polarization. However, addressing the intrinsic trade-off between high optical transparency and robust ferroelectricity remains critical for breakthroughs in multifunctional optoelectronic coupling applications. Herein, designing relaxor ferroelectric transparent ceramics via rare-earth doping is an effective strategy, which refines grain size, introduces polar nanoregions and induces high-symmetry phase structure. It synergistically achieves high transmittance and polarization, laying the foundation for one-structure multi-photoelectric-effects coupled applications. Accordingly, superior energy storage density ( W tot = 10.5 J/cm 3 , W rec = 7.0 J/cm 3 ) and optical transmittance (78 % at 780 nm) are simultaneously realized in Eu 3+ /La 3+ co-doped K 0.5 Na 0.5 NbO 3 (KNN) ceramics, along with excellent photochromic-induced transmittance and luminescence reversible modulation (ΔAbs = 19.35 %, ΔR t = 92.5 %), outperforming previously reported KNN-based multifunctional ceramics in terms of comprehensive performance. This study proposes a viable approach to pave the way for constructing smart materials that can modulate photoelectric performance while extending their functionality.
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高影响因子
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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高影响因子
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
·
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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高影响因子
Materials Advances
·
2023
·Vol. 4
·期 3
·940-947
·
IF 5
Xiaobing Yang,Junjie Pan,Bingcong Xing,Wenjie Lei,Yingchun Fu,Kejun Cheng
Nowadays, aflatoxin B1 (AFB1) contamination is considered as one of the most common food safety issues for humans and animals. As one of the most advanced oxidation techniques, photocatalytic degradation can break down organic contaminants into nontoxic and harmless materials efficiently. In this paper, we explored the degradation efficiency of AFB1 by ZnIn2S4. To promote the photocatalytic degradation efficiency of AFB1, ZnIn2S4 was coupled with MIL-125(Ti) and then doped with La [this hybrid is denoted as La-ZnIn2S4/MIL-125(Ti)] to effectively convert it via photocatalytic generation of superoxide radicals (˙O2− and ˙OH) and achieve much enhanced photocatalytic performance, which is demonstrated by degrading 97.6% of AFB1. According to the transient photocurrent responses, the doping of La and coupling with MIL-125(Ti) can highly improve the efficient separation of the photoinduced electron–hole pairs on ZnIn2S4, leading to the effective conversion of OH− and O2 into ˙O2− and ˙OH, respectively, during the photodegradation process. This strategy of coupling with MOFs and doping with rare earth elements provides a facile and efficient method for degrading food pollutants produced by aflatoxins.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yi Zhang,Cuiping Zhou,Jingwei Li,Jing Dong,Shuai Weng,Pengfei Yin,Xiyuan Sun,Jian Wang,Zhiwei Lu,Hanbing Rao
Herein, a novel Ba 2 SrWO 6 :Mn 4+ , La 3+ (BSW:Mn 4+ , La 3+ ) far-red phosphor was obtained by an addition strategy of La ion to negligible-luminescence BSW:Mn. Deep-red emission peaks at ∼ 664, 679 and 690 nm were observed for BSW:Mn 4+ , La 3+ with the excitation band in the 250 ∼ 600 nm spectral range, which are well matched to the absorption of chlorophyll and phytochromes. An impressive nanorod surface micro-morphology was observed in BSW samples and the size of the surface-grown nanorods can be changed by the addition of La ions. It was speculated that the generation of oxygen vacancies in BSW:Mn probably causes the self-reduction process of Mn 4+ → Mn 2+ , and a charge replenishment mechanism was proposed to explain the abnormal luminescence of Mn 4+ ions. The BSW:0.5%Mn, 5%La phosphor showed a CIE chromaticity coordinate of (0.724, 0.276) with a high color purity of 100%. In addition, the internal and external quantum efficiency of BSW:0.5%Mn, 5%La phosphor reach as high as 51.9% and 39.5%, respectively. Finally, LED devices were fabricated by using the as-prepared BSW:0.5%Mn, 5%La phosphor and applied in the illumination on tomato seeds. It shows that the LED devices can promote the seeding of tomatoes effectively, indicating a potential application value in the plant cultivation field.
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高影响因子
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