APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Qiang Guo,Yu Qiao,Yonghou Xiao,Yi Pan,Yushan Li,Xu Liu,Gaohong He
Cuprous ion modified molecular sieves have been considered as promising CO adsorbents in gas separation or purification industry. However, it persists as a significant challenge to overcome the unfavorable effect of water vapor in the work environment on gas adsorption and separation. Herein, we propose a synthetic strategy using rare earth element La as an additive to form La O La coordination bonds followed by surface silanization treatment to construct a hydrophobic Si O Si barrier to significantly improve the stability of Cu + under humid atmosphere. By successively introducing La 3+ and Cu + into zeolite 5A, CuCl/LaA adsorbents were prepared via ion exchange and solid dispersion methods. And then by silanization modification using toluene as solvent and butyltrichlorosilane (BTS) as hydrophobic agent, hydrophobic CuCl/LaA-BTS adsorbents were prepared. Dynamic adsorption investigation demonstrated that the as-prepared CuCl/LaA-BTS adsorbents possessed hydrophobic surface and consequently the adsorption capacity of CO was enhanced significantly under humid atmosphere. The CO adsorption breakthrough capacity over CuCl/LaA-BTS attained 0.34 mg/g, which was 5.7 times higher than that of zeolite 5A at 40 °C, atmospheric pressure and a relative humidity of RH = 55 %. Moreover, the CO adsorption capacity of CuCl/LaA-BTS retained 0.31 mg/g after four cycle regenerations. This work provides an effective and novel route for synthesizing highly stable cuprous ion modified zeolite adsorbents.
研究领域:
材料科学
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气体分离技术
·
表面改性
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Fangfei Lv,Yiming Yan,Zhongcai Ma,Yibing Guo,Wei Wu,Suwen Li,Lili Huo
The sluggish kinetics of anodic oxygen evolution reaction (OER) has been the restricted factor for large-scale hydrogen production from water electrolysis. Exploring highly efficient OER electrocatalysts is essential to varied renewable energy storage and conversion devices. In this work, we designed and fabricated subminiature tetranickel nitride (Ni 4 N) nanocrystallines modulated by trace amounts of rare earth (RE) encapsulated in ultrathin mesoporous nitrogen-doped carbon shells (RE-Ni 4 N@mesoNC) derived from ultrathin layered hydroxide nanosheets as highly active and stable electrocatalysts for the OER in water spilling. In view of the advantages of excellent electrical conductivity, adjustable surface electronic structure and a high density of utilizable active sites, the as-synthesized RE-Ni 4 N@mesoNC electrodes exhibit more superior performance than RE-free Ni 4 N@mesoNC and commercial IrO 2 . The optimal La–Ni 4 N@mesoNC achieved a lower overpotential of 330 mV at the current density of 10 mA cm −2 and a smaller Tafel slope of 66 mV·dec −1 . And the La–Ni 4 N@mesoNC electrode also exhibit the excellent stability of continuous 72 h i-t tests and the overlapped polarization curve before and after 3000 consecutive CV cycles.
研究领域:
材料科学
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电化学
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能源存储与转换
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
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IF 6.371
Xiyuan Tao,Li Yang,Jiali Liu,Zihao Zang,Peng Zeng,Changfei Zou,Lingguang Yi,Xiaoyi Chen,Xiaolin Liu,Xianyou Wang
Garnet-type Li 7 La 3 Zr 2 O 12 (LLZO) is a promising solid-state electrolyte (SSE) for next generation lithium batteries due to its high Li + conductivity and stability against lithium metal, especially the Li 7−3x Ga x La 3 Zr 2 O 12 (Ga-LLZO) is most valuable because of its high ionic conductivity (> 1 ×10 −3 S cm −1 ). However, it is difficult to prepare high-quality Ga-LLZO by the traditional air ambient sintering. Herein, we develop a simple and efficient rapid ultra-high-temperature sintering (RUHTS) method to prepare high-conductivity Ga-LLZO ceramic SSE. It has been found that the as-prepared Ga-LLZO ceramic SSE with the composition of Li 6.25 Ga 0.25 La 3 Zr 2 O 12 exhibits high relative density of 99%, good ionic conductivity of 1.48 × 10 −3 S cm −1 and large critical current density of 0.5 mA cm −2 after sintering at 1200 °C for 2 min. In addition, the Ga-LLZO SSE shows good electrochemical stability and interfacial compatibility against Li metal. The assembled Li-Li symmetric cell represents a small interfacial impedance of 37 Ω cm 2 . In the same time, the Li/Ga-LLZO/LE+LMNCO full battery has a total impedance of 205 Ω cm 2 , and can deliver a first discharge capacity of 235.1 mAh g −1 at 0.5 C, and the capacity retention rate is 88.3% after 100 cycles. This indicates that the as-prepared Ga-LLZO has good application prospect in the Li-metal solid-state batteries (LMSSBs). Moreover, this method does not require the use of mother powder during preparation process, which will effectively reduce the waste of raw materials, save manufacture costs and be beneficial to quantity production of Ga-LLZO ceramic electrolyte.
研究领域:
材料科学
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电化学
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电池技术
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
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IF 4.2
Lin Mei,Chao Feng,Yuzhong Wang,Qiang Yu,Wenjie Xin,Weifeng Chu,Yanan Wang,Xiangxue Zhu,Shenglin Liu,Hongxia Wang,Longya Xu
Synthesis of acetonitrile (ACN) by way of ethanol dehydroamination process was performed over copper-, zinc-, nickel-, and cobalt-based catalysts in a fixed-bed reactor, by which 20Co/Al2O3 was found to be the best one and ready for subsequent La, Ce, and Pr doping. Then, catalytic tests and a series of characterizations such as XRD, XRF, XPS, TEM, TG-DTA, IGA, NH3-TPD, and N2 adsorption–desorption were carried out. The results demonstrate that rare-earth-modified 20Co/Al2O3 catalysts have improved the catalytic performance for ethanol dehydroamination remarkably; the addition of La leads to better dispersion of cobalt species, the higher surface area of 20Co/Al2O3 catalyst, and fast adsorption for ACN, as well as better resistance to carbon deposition. In the meantime, the La-doped catalyst seems to prefer the route of acetaldehyde imine to ACN rather than to ethylamine, and consequently, a highly selective synthesis of ACN with excellent catalytic stability was obtained with the formation of ethylamine being suppressed..
研究领域:
催化化学
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材料科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Zhang Wen,Bo Zhang,Wanhui Gong,Kai Wang,Bin Liu,Wensheng Ning,Wanjin Yu
La doped silica aerogel composites (La 2 O 3 /SiO 2 -n) with different Si/La molar ratio were synthesized through sol-gel method and atmospheric drying technology, which were used to adsorb thiophenic compounds from model fuels. Compared with the pure SiO 2 aerogel, the adsorption capacities of La 2 O 3 /SiO 2 -n obviously increased, owing to adding La species led to the appearance of the weak Lewis acid sites on the surface. The adsorption mechanism of La 2 O 3 /SiO 2 -n for thiophenics included the direct S-La bond and weak π-La acid-base interaction between La 3+ and thiophenics, and the former was primary. Among La 2 O 3 /SiO 2 -n, the La 2 O 3 /SiO 2 -200 not only had the highest adsorption capacity for thiophene, up to 8.16 mg S/g ads (i.e., 138.31 mg-S/mmol La), but also exhibited an excellent anti-aromatics competitive adsorption ability and a good regeneration performance. The adsorption kinetic and adsorption isotherms were well described by pseudo-second-order (PSO) and Langmuir models, respectively, indicating the adsorption of La 2 O 3 /SiO 2 -200 for TH was dominated by chemisorption, which was a spontaneous and endothermic process. The present of aromatics in model fuels had a slightly negative effect on the adsorption of La 2 O 3 /SiO 2 for thiophene.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
WEAR
·
2024
·
IF 5.3
Xu Tan,Xiuqian Yu,Wenyang Huang,Yifan Zhou,Enzhu Hu,Xingkai Ding,Chuan Li,Kunhong Hu
Two kinds of the novelty lubricant additives (La/CQDs and MoS 2 -La/CQDs dispersions) were synthesized via a simply hydrothermal approach. The dispersions were demonstrated a significant enhancement in the lubrication performance of polyethylene glycol (PEG200). A series of modern analysis technologies were used to elucidate the anti-wear and anti-friction mechanisms of dispersions in PEG200. Results demonstrated that dispersions markedly improved the lubrication performance of PEG200 at 25, 75 and 100 °C. PEG200 containing 0.3 wt% MoS 2 -La/CQDs demonstrated the greatest decrease in the friction coefficient and wear rate, with reductions by 66.3 % and 35.5 % at 100 °C, respectively. Friction and wear mechanisms are ascribed to the engagement of nanoparticle-active components in both dispersions, which facilitate the formation of boundary lubrication films. 1
研究领域:
材料科学
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机械工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Liang Jiang,Qiuyi Wang,Shuang Li,Dong Wang,Yaoyao Tang,Jiahao Luo,Jun Liao,Congcong Ding,Lielin Wang,Mei Tang,Xiaoan Li,Mingsong Shi
Polonium was a highly toxic and radioactive nuclide commonly detected in wastewater from spent fuel reprocessing and lead‑bismuth-cooled reactor systems, making its removal essential for nuclear safety. In this work, lanthanum-modified magnesium‑aluminum layered double oxide (La-MgAl-LDO) was prepared by doping La(III) in Mg-Al layered double oxide (Mg-Al-LDO). Additionally, tellurium, which has similar chemical properties, was used as a substitute for polonium to investigate the adsorption performance. Under the optimized conditions (pH = 6, m/V = 0.2 g/L, and C 0 = 20 mg/L), La-MgAl-LDO achieved a maximum removal efficiency of 99% for tellurite. The adsorption of Te(IV) onto La-MgAl-LDO followed the pseudo-second-order and Freundlich models, indicating that the adsorption process was characterized by multilayer chemical adsorption. The Te(IV) adsorption mechanisms mainly include co-precipitation and surface complexation. In addition, the study confirmed that La 3+ reacted with Te(IV) to form a stable solid precipitate (La 2 Te 6 O 15 ), which played a crucial role in the removal of Te(IV) from aqueous solution.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yuhao Li,Yaling Ma,Yuan Liu,Yiwen Ma,Bing Zhang,Qiang Ma,Yongpan Gu,Dan Yue,Bowen Qin,Xiangdan Zhang,Weidong Li,Yilei Zhang,Zhenling Wang
NiFe layered double hydroxides (LDHs) have been emerged as promising electrocatalysts for water splitting due to their tunable composition and layered architecture. However, their catalytic performance was limited by poor electrical conductivity and insufficient active site exposure. Herein, we reported a lanthanum-doped NiFe LDH nanosheet array (La-NiFe LDH) grown in situ on nickel foam by a simple hydrothermal method. Systematic characterization revealed that the incorporation of La induced lattice distortion and electronic structure modulation, leading to optimized metal-oxygen bonding and enhanced charge transfer kinetics. The optimized La 0.4- NiFe LDH catalyst demonstrated remarkable bifunctional electrocatalytic activity, requiring low overpotentials of 70 mV for the hydrogen evolution reaction at 10 mA cm - ² and 269 mV for the oxygen evolution reaction at 100 mA cm - ². Moreover, it demonstrated exceptional durability over 90 h of continuous operation. Besides, the two-electrode alkaline electrolyzer based on La 0.4 -NiFe LDH required only 1.49 and 1.58 V to achieve 10 and 100 mA cm - ² for overall water splitting, demonstrating superior performance compared to the commercial RuO 2 || Pt/C. This work highlights the potential of rare-earth doping as an effective strategy to engineer high-performance LDH-based electrocatalysts for sustainable hydrogen production.
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Advanced Electronic Materials
·
2026
·
IF 5.9
Qing Tian Li,Xiao Li Zhu,Xiao Qiang Liu,Xiang Ming Chen
Rare earth (RE) substitution is the primary way to realize the electric field-controlled magnetism in BiFeO 3 multiferroic ceramics by breaking the cycloidal spin structure to release the intrinsic weak ferromagnetism, where the electric field-induced phase transition of Pna 2 1 /R 3 c plays the key role. In the present work, the remarkable electric field-controlled magnetism has been achieved in La/Sm co-substituted BiFeO 3 multiferroic ceramics. The structure evolution in Bi 1- x (La 0.37 Sm 0.63 ) x FeO 3 ceramics is modulated from R 3 c to Pna 2 1 and finally Pbnm with increasing x . The weak ferromagnetism is released as the symmetry is tuned from R 3 c to Pna 2 1 and the cycloidal spin structure is broken. Furthermore, La/Sm co-substitution significantly suppresses the leakage current to a level far below that of other RE-substituted BiFeO 3 ceramics, thereby facilitating the enhanced dielectric strength, which significantly promotes the electric field-induced phase transition of Pna 2 1 /R 3 c , and subsequently, the remarkable electric field-controlled magnetism (a change of M r up to 62.7%) is achieved in the present ceramics. Moreover, the significant improvement in ferroelectricity is also achieved after the electric field-induced phase transition of Pna 2 1 /R 3 c .
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Renzhong Xue,Xiaosong Liu,Yuping Yang,Xiang Zhu,Tao Li
Two-dimensional (2D) materials with dual-functional dielectric and varistor properties, such as CdCu 3 Ti 4 O 12 (CdCTO) films, have great application potential in multi-functional integration of electronics and energy systems. However, reducing the dielectric loss tangent (tanδ) and increasing the breakdown field strength ( E b ) of CdCTO films, while maintaining their high dielectric constant (ε′) is still a challenge. In this work, La 3+ doping via a sol-gel method was implemented to modify the optical, dielectric and non-Ohmic properties of CdCu 3 Ti 4 O 12 thin films. The La-doped thin films exhibited a single-phase structure and suppressed the grain growth at varying optical band gaps from 3.61 to 3.21 eV. The grain boundary (GB) resistance and the barrier height were increased significantly in the doped films, thereby exerting positive effects on tanδ, E b and nonlinear coefficient (α). The ε′ parameter followed the internal barrier layer capacitor (IBLC) model, decreasing with the grain size, but remained at a relatively high value. As a result, an extremely low tanδ of ∼ 0.011 and high E b of ∼ 82.1 kV/mm along with ε′ of ∼ 8890 and α of ∼ 6.64 were obtained in Cd 0.91 La 0.06 Cu 3 Ti 4 O 12 film. The relaxation mechanism in the medium frequency range was ascribed to a Maxwell–Wagner relaxation related to GBs. Therefore, effective methods were proposed to obtain double-functional films that possess excellent dielectric and non-Ohmic properties simultaneously.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Haotian Hao,Xu Huang,Yao Zhang,Shuo Xu,Yili Wang,Baoyou Shi
The efficient removal of phosphate from aqueous systems is critical for mitigating eutrophication and enhancing aquatic ecological sustainability. In this study, a regenerable magnetic composite material, designated as MLCit, was synthesized via an in-situ embedding method. This composite integrates a novel phosphate-binding lanthanum citrate complex (La-Cit) with Fe 3 O 4 nanoparticles to achieve efficient phosphate removal. Comparative analysis revealed that MLCit-1 (La/Fe molar ratio = 1:1) exhibits enhanced adsorption performance relative to four other magnetic lanthanum-based composites (La 3+ /Fe 3 O 4 , La 2 (CO 3 ) 3 /Fe 3 O 4 , La(OH) 3 /Fe 3 O 4 , and La 2 O 3 · x H 2 O/Fe 3 O 4 ). Specifically, MLCit-1 demonstrated a phosphate adsorption capacity 1.5–9 times higher than these counterparts, with an initial adsorption rate 1.46–2.22 times greater. The phosphate adsorption capacity increased significantly with more lanthanum proportion in MLCit. Structural characterization confirmed that MLCit-4 (La/Fe molar ratio = 4:1) adopts a core–shell structure, comprising Fe 3 O 4 nanoparticles encapsulated by amorphous La-Cit. The maximum adsorption capacity of MLCit-4 reached 77.85 mg P/g, with equilibrium achieved within 3 h at a dosage of 0.5 g/L. MLCit-4 exhibited broad pH applicability (4–11), exceptional anti-interference ability, and achieved residual phosphate concentrations below 0.05–0.1 mg P/L in four environmental water samples (TP < 5 mg P/L). The exhausted MLCit-4 could be easily regenerated by 3 h treatment of the 2.5 M NaOH and 1.875 M NaCl mixture. Remarkably, MLCit-4 retained its phosphate removal efficacy over 20 consecutive adsorption–desorption cycles, while simultaneously enabling the enrichment of phosphate in the desorbent. Mechanistic studies identified ligand exchange between P and citrate, forming inner-sphere complexes, with supplementary contributions from electrostatic interactions.
研究领域:
环境科学
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水处理技术
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 5
·3252-3260
·
IF 3.9
Moke Zhou,Hetuo Chen,Yi He,Guohong Zhou,Shuren Zhang,Bin Tang
In this study, Y 3− x La x Al 5 O 12 (0 ≤ x ≤ 0.09) ceramics were synthesized, and the phase composition, lattice evolution, and microwave dielectric properties were investigated in detail. Scanning electron microscopy confirms that the addition of moderate amounts of La 2 O 3 improves the grain development of YAG ceramics, but excessive doping destabilizes the crystal structure. Transmission electron microscopy characterization shows that the variation of the dielectric properties of the samples with x -value is related to the occurrence of benign dislocation structures caused by modifications in the type and content of the A-site rare-earth ions. The variations in relative density, dielectric constant, and quality factor remain basically coordinated. The optimum microwave dielectric properties of La 3+ doped YAG samples are exhibited as ε r = 10.61, Q × f = 187, 542 GHz, τ f = −31.2 ppm/°C when La 2 O 3 is doped at x = 0.015.
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）