Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Song-Tao Dong,Xin Ye,Zhuang Fu,Xiaoyun Jin,Junlin Wei,Lei Wang,Ya-Mei Zhang
In this study, a series of La 1−x Sr x AlO 3 (x = 0.0, 0.1, 0.15, and 0.2) nanotubes were prepared by electrospinning method, and their morphological and electrochemical properties were characterized. The results show that the La 1−x Sr x AlO 3 (x = 0.0, 0.1, 0.15, and 0.2) nanotubes exhibit a distinct hollow structure, the average diameters of the nanofibers are ∼75 nm, 70 nm, 95 nm, and 142 nm. The electrochemical results show that the La 1−x Sr x AlO 3 nanotubes have excellent electrochemical performance, and the maximum specific capacitance of 180 F/g for the La 0.9 Sr 0.1 AlO 3 . After 1500 charge–discharge cycles, the specific capacitance of the La 0.9 Sr 0.1 AlO 3 electrode retained ∼99%, indicating that it has good cycling stability and long service life. This provides a promising electrode material for supercapacitors.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能陶瓷
·
电容器
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Ruinan Wang,Shuang Ni,Gang Liu,Xiaoxiang Xu
In this work, we have applied microstructure management and doping techniques to conventional wide band gap semiconductor CaTiO 3 with the aim to improve its light absorption and photocatalytic activity. A series of La/Cr co-doping hollow CaTiO 3 cubes have been successfully prepared by a template-free hydrothermal method. Their crystal structures, microstructures, optical absorption and photocatalytic hydrogen production have been systematically investigated. Our results suggest that hollow CaTiO 3 owns a higher light absorption than solid one and demonstrates a much better photocatalytic activity both under full range (λ ≥ 250 nm) and visible light illumination (λ ≥ 400 nm). These improvements probably originate from the peculiar hollow microstructures that increase photon-matter interactions and shorten the charge migration pathways. The photocatalytic activity for hydrogen production has been further studied by varying the La/Cr content in CaTiO 3 . An optimal doping point at 5% La/Cr doping level has been reached for full range illumination with apparent quantum efficiency approaching ∼2.41%. Nevertheless, the activity under visible light illumination shows a clear dependence on doping level with highest apparent quantum efficiency ∼0.40% at 20% La/Cr doping level. DFT calculations reveal the critical role of Cr in forming a new spin-polarized valence band inside the original band gap of CaTiO 3 therefore is responsible for band gap reduction and visible light photocatalysis. This work here highlights the importance of microstructure control to the photocatalytic performance and shall shed a light on the design and development of efficient photocatalytic materials/systems.
研究领域:
材料科学
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光催化
·
能源化学
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无机功能材料
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半导体物理
·
纳米结构材料
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DOI
高影响因子
CATALYSIS TODAY
·
2019
·
IF 4.888
Huixian Zhong,Jiaming Wang,Kang An,Jie Yang,Zhi Ma,Hong Wang,Yuan Liu
A new catalyst for direct ethanol synthesis (DES) from syngas composed of Rh nanoparticles (NPs) highly dispersed on La-Ce-O modified LaFeO 3 which was loaded on SiO 2 support was studied in this work. Over the best catalyst 40.6 % of the reacted CO could be directly converted into ethanol with CO conversion of 14.2 % at 250 °C, 3 MPa and GHSV of 3900 mL (g cat h) −1 . The results indicated that adding cerium into LaFe 0.5 Rh 0.5 O 3 /SiO 2 resulted in La 1-x Ce x Fe 0.5 Rh 0.5 O 3 /SiO 2 , the incorporation of Ce effectively regulated the interface electronic states of Rh NPs . The well matched catalyzing process by the active sites of Rh 0 , Rh + (or Rh δ+ ) and the oxygen vacancies on the surface of LaFeO 3 , of those, Rh 0 dissociatively adsorbed CO and the latter two associatively adsorbed CO could effectively improve the activity and selectivity for DES. Moreover, the interaction of La-Ce-O and LaFeO 3 strengthened the CO adsorption on the oxygen vacancies on LaFeO 3 , which improved the capacity of assistance in activating CO associatively, thus further increasing the selectivity to ethanol. The catalyst exhibited excellent resistance to carbon deposition and sintering, attributing to the small size of Rh NPs and the carbon eliminating effect of La 2 O 3 and oxygen vacancies on the surface of LaFeO 3 .
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·Vol. 46
·期 15
·9996-10006
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IF 4.939
Muhammad Yousaf,Majid Niaz Akhtar,M.A.K. Yousaf Shah,Sajid Rauf,Naveed Mushtaq,Asma Noor,Muhammad Akbar,Muhammad Afzal,Baoyuan Wang
Rare earth element doping is a popular methodology for improving the electrical and electrochemical properties of materials. Inspired by this ideology, garnet ferrite material Sm 3 Fe 5 O 12 (SFO) doped by rare earth (Yb, La) metal ions to form Sm 3-0.5 Yb 0.5 Fe 5 O 12 (SYFO) and Sm 3-0.5 La 0·5 Fe 5 O 12 (SLFO). The samples are synthesized by sol gel auto combustion and have been applied as electrolyte membrane for the first time in low temperature solid oxide fuel cell (LT-SOFC). The results indicate that the as-prepared materials have triple charge transport (H + /O −2 /e − ) carrier which promotes the hydrogen oxidation reaction (HOR) and oxygen reduction reactions (ORR) in SOFC at triple phase boundary region (TPB). Electrochemical impedance spectroscopy (EIS) reveals that the polarization resistance of SLFO membrane significantly reduces from 0.92 Ω-cm 2 to 0.45 Ω-cm 2 and the power output improve from 310 mW/cm 2 to 650 mW/cm 2 at 550 °C temperature in comparison with that of SYFO and SFO electrolyte supported cells. UV-vis diffused spectroscopy explains the semiconducting nature of the prepared materials due to the existence of optical bandgap in the semiconductor region. The further investigation also verifies the protonic conduction of SLFO membrane by constructing oxygen ion blocking fuel cell with configuration of Ni-NCAL/BZCY/SLFO/BZCY/Ni-NCAL having 427.94 mW/Cm 2 fuel cell performance with 1.03 OCV at 550 °C temperature.
研究领域:
材料科学
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能源工程
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电化学
·
燃料电池技术
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固态离子学
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DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 82
·期 10
·2098-2113
·
IF 1.638
He Jiaojie,Yang Yue,Xu Yuhong,Wang Zichuan,Xu Bing,Huang Yuheng,Yang Liwei
In this study, an excellent phosphate adsorbent was prepared for removing phosphate to an extremely low concentration. The La(OH) 3 nano-rods stabilizing in polyacrylonitrile (PAN) nanofibers (PLNFs) were prepared by electrospinning and a subsequent in situ precipitation. PAN nanofibers were employed as the matrix of the composite nanofibers, where the well-dispersed La(OH) 3 nano-rods were encapsulated as the active species for highly efficient phosphate capture owing to the strong binding between phosphate and lanthanum. On account of the nano-structure, the maximum phosphate adsorption capacity was 151.98 mg P/g (La), much higher than the result of La(OH) 3 nano-crystal, produced by precipitation without PAN or any organic surfactants. Moreover, the PLNFs could remove phosphate (2 mg P/L) to an extremely low concentration within 20 min, which could lead to a nutrient deficient condition to protect water quality and ecosystem. The optimization of PLNFs design was implemented through parameter adjustment of electrospinning. Lanthanum salt content, humidity, concentration of solution and applied voltage were chosen to analyze the influences on the composition, diameter and morphology of the nanofibers, giving the result that the most effective adsorbent was the PLNFs with spider-web-like nano-structures. The La(OH) 3 nano-rods stabilizing in polyacrylonitrile nanofibers (PLNFs) were prepared by electrospinning and a subsequent in situ precipitation. The maximum phosphate adsorption capacity by PLNFs was 151.98 mg P/g (La). The PLNFs could remove phosphate (2 mg P/L) to an extremely low concentration within 20 min. The PLNFs with spider-web-like nano-structures showed the highest phosphate removal.
研究领域:
环境科学
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纳米技术
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材料科学
·
水处理
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DOI
高影响因子
Advanced Powder Materials
·
2021
·
IF 0
Shaoju Jian,Zhiwei Tian,Jiapeng Hu,Kaiyin Zhang,Lin Zhang,Gaigai Duan,Weisen Yang,Shaohua Jiang
A series of La-doped ZnO (La/ZnO) nanofibers were prepared by electrospinning-calcination technology and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), ultraviolet–visible (UV–Vis) absorption spectroscopy and specific surface area analysis. The effect of numerous operational parameters involving calcination temperature, La doping amount, La-doped ZnO concentration and initial Rhodamine B (Rh B) concentration on photocatalytic efficiency of the composite has been analyzed by using Rh B for degradation under the illumination of visible light. Under optimum conditions, ZnO doped with 1.5 at.% La achieved 94.31% Rh B degradation after 510 min of visible light illumination. The kinetic data of La/ZnO catalyst for Rh B photodegradation fitted the Langmuir-Hinshelwood first-order (LHFO) kinetic model well.
研究领域:
材料科学
·
环境科学
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DOI
RARE METALS
·
2020
·Vol. 40
·期 7
·1753-1761
·
IF 2.161
Li Jiang-Wei,Song Qi,Li Jiang-Bing,Yang Sheng-Chao,Gao Yan-Shan,Wang Qiang,Yu Feng
Abstract For better performances of Ni-based catalysts at low temperatures, Ni/SiC catalyst doped with a little amount of additive La was successfully prepared. The catalytic CO methanation activity tests showed that 3%La–Ni/SiC catalyst was excellent at a low reaction temperature (95.9% CO conversion and 85.1% CH 4 selectivity at 250 °C) with a superior stability compared with Ni/SiC (3.4% CO conversion and 0% CH 4 selectivity at 250 °C). This can be attributed to that the addition of La can markedly improve the dispersibility of active metal Ni and reduce the particle sizes of Ni nanoparticles or clusters, and can also regulate the interaction between active components and supports. Moreover, the high thermal conductivity and thermal stability could avoid the generation of hot spots in the catalyst bed. These results will promote the development of highly active Ni-based catalysts for the low-temperature methanation reaction. Graphic Abstract
研究领域:
催化
·
化学工程
·
材料科学
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DOI
高影响因子
Chem Catalysis
·
2026
·
IF 10.7
Yuan Yuan,Xitang Qian,Shiyuan Liu,Weiwei Chen,Minglei Lu,Ernest Pahuyo Delmo,Yan Zhang,Yao Yao,Yuxiang Lyu,Yushen Liu,Dong Su,Minhua Shao
Efficient electrocatalytic nitrogen oxidation reaction (eNOR) requires promoting N 2 activation while minimizing the competing oxygen evolution reaction (OER). A compartmentalized La-ZnO core-shell electrocatalyst is constructed to mimic cellular functional segregation. The crystalline ZnO shell acts as a selective interface that enriches N 2 and limits OH − adsorption, thereby reducing the OER current. Beneath the shell, a porous amorphous oxygen-deficient core exposes dynamically accessible undercoordinated Zn–O–La sites. These sites promote stabilization of key intermediates, including ∗N 2 O 2 − , and support stepwise conversion after N 2 adsorption activation and oxidation. This spatial separation lowers the overall energetic demand along the 10-electron NOR pathway in alkaline electrolyte. The electrocatalyst reaches a Faradaic efficiency of 40.4% and a nitrate yield rate of 11.9 μmol mg −1 h −1 .
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DOI
高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Yu-Han Yuan,He-Jie Wu,Jia Liang,Hai Huang,Gui-Fang Li,Jin-Wei Yan,Shuang-Lin Cai,Yong-Qi Ye,Ye Zeng,Ming-Ming Tao,Xiao-Hong Fan,Yi Li,Ding-Rong Deng,Qi-Hui Wu
Driven by the global push for sustainable energy, supercapacitors are regarded as competitive energy storage systems. Nevertheless, boosting their energy density and cycling durability remain core challenges. Herein, a La 2 O 3 /Al 2 O 3 heterostructure (La-Al-O) is in-situ fabricated on nickel foam (NF) via a hydrothermal route. Electrochemical activation converts crystalline La 2 O 3 into amorphous La 2 O 3 , triggering structural reconstruction: interwoven nanosheet networks evolve into loose, crumpled nanosheets. This transformation enriches oxygen vacancies and generates Ni(OH) 2 on NF to create abundant ion-accessible active sites, while Al 2 O 3 serves as a structural stabilizer against framework collapse (activated La-Al-O, abbreviated A-La-Al-O). In terms of electrochemical performance, the A-La-Al-O/NF electrode exhibited a high specific capacitance of 4.60 F·cm −2 at a current density of 5 mA·cm −2 . After 20,000 cycles at a scan rate of 20 mA·cm −2 , the cycle retention rate was 75.7%. For the assembled asymmetric device (denoted as A-La-Al-O/NF/activated carbon (AC)), an energy density of 49.41 Wh·kg −1 was achieved at a power density of 889.38 W·kg −1 , with a cycle retention rate of 82.5% after 20,000 cycles. This study adopts method combining hydrothermal and electrochemical activation without the need for binders, featuring a simple and convenient process. It provides a new insight for the high-value utilization of rare earths and the development of high-performance supercapacitors.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Binghao Wang,Yuzhi Zhang,Xinyu Wang,Jiayu Ma,Lingnan Wu,Changchun Chen
La-based perovskite oxides with configurational entropy increasing from low to high, namely LaMnO 3 , La(Mn 0.5 Fe 0.5 )O 3 , La(Mn 1/3 Fe 1/3 Co 1/3 )O 3 , La(Mn 0.25 Fe 0.25 Co 0.25 Ni 0.25 )O 3 , and La(Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 Cu 0.2 )O 3 , were synthesized by a solid-state reaction method, and their phase evolution, microstructure, and infrared (IR) radiation properties were systematically investigated. X-ray diffraction and transmission electron microscopy reveal that increasing configurational entropy at the B-site induces a structural transformation from R-3c to Pm-3m and eventually back to a stabilized R-3c phase in the five-component system, accompanied by lattice distortion and suppressed elemental segregation. Room-temperature spectral emissivity measurements show that the R-3c phase exhibits superior IR emission compared to the Pm-3m phase in the 2-8 μm range. Notably, at elevated temperatures (600-900 °C), the emissivity of LMFCNCO increases with temperature, reaching 0.910 at 900 °C, while the binary oxide LaMnO 3 exhibits a marked decline. X-ray photoelectron spectroscopy indicates that the high entropy design promotes mixed-valence states of B-site cations and a high concentration of oxygen vacancies, which enhance small-polaron hopping and carrier absorption at high temperatures. This work demonstrates that entropy engineering is an effective strategy for tailoring the high temperature infrared radiation performance of perovskite ceramics, offering promising candidates for thermal management and energy conversion applications.
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产品关联
DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 7
·1370
·
IF 3.7
Yi Luo,Nan Li,Lingjing Yang,Jinlong Wei,Yuantao Yang,Wentao Wang,Yang Zhao,Ruidong Xu,Xuanbing Wang
The high energy consumption of lead anodes in zinc production is caused by the slow oxygen evolution reaction (OER). We made a La-Mn co-doped β-PbO2anode using electrodeposition to solve this issue. The XRD and XPS results show that adding La shrinks the lattice and changes the electron structure. This helps Mn4+change into active Mn3+and creates more active oxygen on the surface, making the reaction easier. EIS tests show that the charge transfer resistance (Rct) decreased by 4.2 times, decreasing from 147.6 Ω to 34.72 Ω at 1.0 V. The Bode phase peak also moved to a lower frequency (from 122 Hz to 0.215 Hz), proving that the electrochemically active surface area (ECSA) increased significantly. At the industrial current of 50 mA cm−2, the anode shows a low overpotential of 840 mV and a Tafel slope of 265 mV dec−1. This improved performance saves 187.10 kWh of energy per ton of zinc. Therefore, the LaMn-β-PbO2anode is a promising and energy-saving option for industrial zinc production.
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产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2025
·Vol. 9
·期 7
·1189-1204
·
IF 6.4
Bing Wang,Yao Liu,Hong Hao,YuZhen Zhao,ZeMin He,WenQi Song,EnZhou Liu,Zhuo Li,ZongCheng Miao
Metal ion doping is an effective strategy to improve the charge carrier separation pathways in semiconductors. In this study, La3+ ions were introduced into Ag3PO4via an in situ co-precipitation method, forming p-type doped LaxAg3−xPO4 without altering the original cubic morphology of Ag3PO4. The introduction of La3+ led to a reduction in the band gap, an expansion of the light absorption range, and an increase in electron localization. Density functional theory (DFT) calculations revealed that La doping introduces new states within the band gap, facilitating energy transitions and altering the electronic structure. Time-dependent DFT (TDDFT) calculations confirmed that the introduction of La3+ enables photoexcited electrons to predominantly migrate from Ag 4d and O 2p orbitals to La 4d and P 2p orbitals. This key finding unveiled the anti-photocorrosion mechanism of LaxAg3−xPO4. Free radical capture experiments and electron paramagnetic resonance (EPR) analysis demonstrated that La doping enhances the electron migration efficiency in LaxAg3−xPO4, promoting the conversion of ˙O2− to ˙OH radicals. This study not only provides an innovative approach for the application of La-doped Ag3PO4 in environmental pollutant catalysis but also reveals a novel internal electron transfer pathway and the underlying mechanism for enhanced photocatalytic activity.
研究领域:
材料科学
·
环境科学
·
理论化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）