INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Hongtao Zou,Feng Guo,Minghong Luo,Qilu Yao,Zhang-Hui Lu
Ultrafine NiFe nanoparticles (NPs) decorated by La(OH) 3 have been successfully prepared via a facile one-step co-reduction method without the help of surfactant or support. It was found that after being decorated with La(OH) 3 , the NiFe–La(OH) 3 NPs have a smaller particle size and lower crystallinity . The resultant NiFe–La(OH) 3 nanocatalyst exhibits an excellent catalytic activity , 100% H 2 selectivity, and satisfied recyclability for hydrogen evolution from hydrous hydrazine (N 2 H 4 ·H 2 O) at 343 K under alkaline conditions, giving a high turnover frequency (TOF) value of 100.6 h −1 , which is more than 35 times higher than pure NiFe NPs (2.8 h −1 ). The kinetics study shows that with respect to the concentration of catalyst and N 2 H 4 , the N 2 H 4 dehydrogenation reaction follows fist-order kinetics and zero-order kinetics, respectively. Furthermore, NiFe–La(OH) 3 also exhibits an outstanding performance and excellent recycle stability during high dehydrogenation of hydrazine borane (N 2 H 4 BH 3 ). The excellent performances for the dehydrogenation of N 2 H 4 and N 2 H 4 BH 3 could be attributed to the strong interaction between La(OH) 3 and NiFe NPs, as well as ultrafine and low crystalline NiFe NPs due to the addition of La(OH) 3 .
研究领域:
催化
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材料科学
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化学工程
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纳米技术
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产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2019
·
IF 1.918
Chenghuan Yang,Liang He,Qingqing Guan,Jiajing Chen,Rongrong Miao,Lei Tao,Ningmeng Hu,Bin Li
Enhancement of the transesterification efficiency of triglyceride has come under heated study in biodiesel-making industry. In this research, the NiMo/La-Al2O3 nanopowders have been prepared for producing biodiesel efficiently. The screening test showed that the NiMo/La-Al2O3 catalyst has the best catalytic activity for triglyceride transesterification. Besides, the process parameters including reaction temperature, time, oil-to-alcohol ratio and catalyst loading etc., also have been investigated for optimization of the transesterification process. The results showed that with 5 wt% of catalyst loading, and oil to methanol molar ratio of 1:9, the conversion yield of triglyceride could be up to 95.2% within 120 min at 160°C. The NiMo/La-Al2O3 catalyst has the outstanding recycle property, which proved that the prepared NiMo/La-Al2O3 powders can be suitable for biodiesels’ production.
研究领域:
化学工程
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催化
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可再生能源
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生物柴油生产
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Shanshan Song,Yijun Gao,Linbo Cao,Ho Seok Park,Zhiliang Liu,Fei He,Wenwu Li,Meilin Liu,Piaoping Yang
Solid polymer electrolytes have emerged as promising materials for next-generation lithium metal batteries due to their enhanced safety and high energy density potential. However, their widespread adoption is hindered by slow ion transport and inefficient lithium-ion (Li + ) selectivity. To overcome these limitations, this study introduces a composite electrolyte by incorporating functionalized La(OH) 3 nanofibers with oxygen vacancies into a Poly(ethylene oxide) (PEO) matrix. These nanofibers, synthesized via a simple method, are designed to improve Li + mobility by leveraging their oxygen vacancies to immobilize TFSI − anions from the bis(trifluoromethanesulfonyl)imide (LiTFSI). Simultaneously, amino groups on the nanofiber surface act as binding sites, facilitating lithium salt dissociation and creating supplementary ion transport pathways. Density functional theory (DFT) and molecular dynamics (MD) simulations reveal that the functionalized La(OH) 3 nanofibers effectively suppress TFSI − anion movement while reducing the energy barrier for Li + migration. This mechanism elevates the Li + transference number to 0.51, a significant improvement over the conventional PEO-based electrolytes. The composite electrolyte exhibits excellent performance in Li||Li cells, maintaining stable cycling for over 600 h at a current density of 0.38 mA cm −2 . Furthermore, a solid-state LiFePO 4 ||Li battery demonstrates highly reversible capacities of 100.2 mAh g −1 after 600 cycles at 8C. By combining anion confinement strategies with tailored electronic interactions, this work provides a practical approach to advancing solid-state battery performance. The findings not only highlight the potential of La(OH) 3 -PEO composite electrolytes but also establish a new framework for optimizing ionic conductivity through targeted molecular design.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2018
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IF 5.807
Taiwan Liao,Ting Li,Xiangde Su,Xiang Yu,Huiyu Song,Yi Zhu,Yuanming Zhang
A series of La(OH) 3 -modified magnetic pineapple biochar (La x -MC) with different contents of La(OH) 3 were prepared and used as phosphate adsorbents for the first time. With the increase of La(OH) 3 content, the adsorption capacity for phosphate increased while the magnetic property decreased. La10-MC exhibited excellent magnetic property for easy recovery and high adsorption capacity up to 101.16 mg P/g, which was 27 times that of pineapple biochar and much higher than most phosphate adsorbents. Adsorption isotherm and adsorption kinetics were better fitted by Langmuir model and pseudo second-order model, respectively. The removal efficiency >96.04% in coexisting ions indicated its high selectivity to phosphate. Little decrease in removal efficiency after three adsorption-desorption cycles suggested its excellent stability and cyclic utilization. Leaching study demonstrated the negligible risk of La 3+ and Fe 3+ leakage during adsorption process. Mechanism study revealed that the adsorption mechanism involved precipitation, electrostatic interaction, ligand exchange and inner-sphere complexation.
研究领域:
环境科学
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材料科学
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水处理
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产品关联
DOI
PubMed
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
ShaoJie Hong,Bin Guo,XiangQian Ren,Yang Cao,XiuMin Xu,Xingfu Zhou
The practical application of conventional Ti/SnO 2 -Sb electrodes is hindered by their low oxygen evolution potential (OEP) and rapid deactivation. Rare earth doping has been proposed to enhance electrode stability and catalytic activity; however, the comparative effects of different rare earth elements (e.g., La vs. Eu) on both structural and electrochemical properties remain unclear. In this paper, the fabrication of lanthanum- and europium-doped Ti/SnO 2 -Sb (TSS) electrodes and the electrochemical degradation of methylene blue (MB) were investigated. Although both lanthanum (La) and europium (Eu) are rare earth elements with many similarities, lanthanum (La)-modified electrode exhibits distinct performance characteristics. It is indicated that the Ti/SnO 2 -Sb-La (TSSL) electrode has a comparatively better crystal phase, enhanced surface hydrophobicity, and better electrochemical performance. The TSSL electrode exhibits a higher OEP of 1.84 V than other electrodes, showing a 0.15 V increase when compared with the undoped electrode. The peak oxidation current reaches 0.82 mA/cm 2 , which provides more active sites for the catalytic reaction. It is found that the La-doped electrode has better performance in wastewater treatment; the TSSL electrode shows a 45% increase in degradation efficiency when compared with the Ti/SnO 2 -Sb-Eu (TSSE) electrode for treatment of 50 ppm MB in 25 min. Moreover, the effects of current density and the initial concentration of MB were also investigated. Considering the degradation rate and energy consumption, the optimum current density for wastewater treatment is 20 mA/cm 2 . The outcome indicated that the degradation of MB was up to 98.5% in 25 min.
研究领域:
电化学
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环境工程
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材料科学
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水处理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xiufen Yang,Runzhi Han,LiWei Shi,YiXin Li,Changyong Lan,Leiming Chen,Chuanfu Huang
To address the persistent challenges of wide band gap (2.13 eV), high carrier recombination rates, and poor cycling stability in bismuth ferrite (BiFeO 3 BFO)-based photocatalysts, this study introduces an unprecedented La³⁺/Ti⁴⁺ dual-site doping strategy. La/Ti co-doped BFO nanoparticles (n% BLFTO) were synthesized using a sol-gel method. The synergistic effects of La³⁺-induced gradient oxygen vacancies (increased by 270%) and Ti³⁺/Ti⁴⁺ redox couples led to a significant band gap narrowing to 1.79 eV, extending visible light absorption to 450-700 nm. Remarkably, the optimized 30% BLFTO sample achieved a 98.9% degradation efficiency of Rhodamine B (Rh B) within 120 minutes-7.17% higher than pure BFO and maintained 95.92% efficiency after 12 cycles (2.98% decay), demonstrating exceptional stability rarely reported in prior works. In-situ X-ray Photoelectron Spectroscopy and Photoluminescence Spectroscopy analyses revealed that dual-doping synergistically modulates carrier dynamics via Fe²⁺/Fe³⁺ mixed valency and abundant oxygen vacancies, thereby prolonging carrier lifetimes and enhancing photocatalytic activity. This work pioneers a dual-doping framework that simultaneously enables highly efficient visible-light-driven degradation of Rh B and exceptional cycling stability, offering new insights for the design of robust photocatalysts for environmental remediation and renewable energy applications.
研究领域:
材料科学
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环境科学
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光催化
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纳米技术
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固态化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL GEOLOGY
·
2025
·
IF 3.6
Changjin Liang,Honghai Wu,Yaowei Li,Yufeng Guan
Ferrihydrite (Fh) can usually transform into phases with higher crystallinities. This may greatly alter Fh adsorption capacity for chromium ions, thereby affecting their immobilizations and fates. Foreign elements [e.g., lanthanum (La)] as impurities can become incorporated into Fh. Herein, the effect of La-substitution into Fh and the influence of the presence of Cr(VI) on Fh phase transformation and fate of Cr(VI) were investigated. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Electro-chemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS) and other test methods were employed to probe phase changes after the Fe(II)-induced La-substituted Fh (La-Fh) transformations. At pH 5.5, no neoformed phase was observed until 7 d for La-Fh or pure Fh at 1 mM Fe(II) aq, but all La-Fh systems underwent transformations at 5 mM Fe(II)aq. A low pH and Fe(II)aq level favored lepidocrocite (Lp) to form, whereas goethite (Gt) was the predominant phase rather than Lp as pH increased to 7.2 with higher level Fe(II)aq. However, the La-substitution inhibits the La-Fh transformation rate and path. This made 5 % La-Fh transformed to Lp after 30 d at pH 7.2 and 1 mM Fe(II)aq. The La-release was present to some extent during the transformation process. Either the inhibition to La-Fh transformation or the La-slow release favors the retention of early-adsorbed Cr(VI) on iron-mineral surface. The added Cr(VI) might promote the La-Fh transformation even under a lower-level Fe(II), primarily attributed to the rapid reduction of Cr(VI) to Cr(III) by Fe(II), which produced more liable Fe(III) in addition to the Cr(III) that can improve the mineral conductivity, thereby enhancing the La-Fh transformation. Mechanisms responsible for the Fe(II)-induced La-Fh transformation companying the La slow-release are proposed to provide insights into the reduction and immobilization of Cr(VI) under anaerobic conditions, thus demonstrating that La-Fh is a promising material for application in Cr-contaminated site remediation.
研究领域:
环境化学
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地球化学
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土壤科学
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材料科学
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环境修复
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Wenji Ruan,Menglin Wu,Yuanhua Xia,Jiupai Ni,Chengsheng Ni
This study aimed at improving electrocatalytic activity of solid oxide electrolysis cell (SOEC) cathode via in-situ exsolved nanoparticles. La 0.67 Sr 0.33 Fe 0.67 Ti 0.33 O 3-δ (LSFT) and La 0.67 Sr 0.33 Fe 0.6 Ni 0.067 Ti 0.33 O 3-δ (LSFNT-67) cathodes with a La/Sr ratio about 2.0 showed the exsolution of Fe 0 and FeNi 3 alloy nanoparticles, respectively, under a reducing atmosphere. The SOEC with LSFT of electrocatalysis is better than LSFNT-67 at 800 °C for direct electrolysis of CO 2 , the current density of LSFT and LSFNT-67 reach − 0.54 A cm −2 and − 0.29 A cm −2 , respectively, and the Faradaic efficiency is close to unity during the 25 h′ durability under a − 1.3 V bias. The better cell performance for the cell with LSFT than LSFNT-67 could be related to the larger distortion and the less amount of insulating LaSrGa 3 O 7 in the former, causing its unexpectedly larger quantity of metal exsolution and electron conduction for more active reaction sites for CO 2 activation. This work demonstrated that apart from thermodynamic consideration, steric effect of the B site cation could be important for the exsolution of metal particles from a perovskite with high La/Sr ratio and the resultant electrocatalysis of CO 2 electrolysis.
研究领域:
材料科学
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电化学
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催化
·
能量转换
✓ 已验证
DOI
高影响因子
International Journal of Precision Engineering and Manufacturing-Green Technology
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2023
·Vol. 11
·期 2
·449-461
·
IF 4.2
Yang Xinlei,Yang Fan,Afzal Muhammad,Sun Wanli,Kim Jung-Sik
La/Pr co-doped ceria (LCP) is processed to fabricate low-temperature ceramic fuel cell based on industrial-grade rare-earth carbonate electrolyte that is reached above a maximum power density of 750 mW/cm 2 at 520 °C. The charge carriers are investigated through LCP fuel cell having symmetric NCAL (Ni 0.8 Co 0.15 Al 0.05 LiO 2-δ ) electrodes using proton conductor BCZY (BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ ) as a blocking layer and are found protons that dominate during the cell operation. The results of associated characterizations for HCC (hydrogen concentration cell) and the OCC (oxygen concentration cell) reveal that LCP material is mixed conductor of both protons and oxygen ions simultaneously. Transmission electron microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) analysis before and after the electrochemical testing of the cell are performed which show an amorphous layer of LiOH/Li 2 CO 3 mixture that is formed after the tests on the surface of LCP structure. Conceptually, it looks that LiOH/Li 2 CO 3 mixture in molten state in the interface region of two-phase material promotes the proton conduction through LCP electrolyte, with negligible oxygen ion conduction.
研究领域:
能源材料
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固态电化学
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燃料电池
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材料科学
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纳米技术
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无机化学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Pengkai Shan,Hui Ye,Bin Qian,Yifeng Zheng,Guoping Xiao
Ruddlesden–Popper (R-P) oxides (A n+1 B n O 3n+1 ) are potential air electrodes for solid oxide electrolysis cells (SOECs) because of their good electrochemical performance. Among them, SrEu 2 Fe 2 O 7-δ (SEF) with n = 2 has received extensive attention because of its special structure and promising ionic–electronic conductivity. However, the SEF material is prone to degradation at high temperatures (600 °C–800 °C), and its long-term stability is easily affected. In this study, R-P oxide Sr 1-x La x Eu 2 Fe 2 O 7-δ (SLEFx; x = 0, 0.05, 0.1) was successfully synthesized using the sol–gel method. XRD results showed that La-doped SEF displayed good chemical and thermal compatibility with the gadolinia-doped ceria electrolyte. The SLEF0.05 electrode exhibited a polarization resistance of 0.075 Ω cm 2 at 800 °C, which was 88.2 % lower than that of SEF. The half-cell based on the SLEF0.05 air electrode exhibited improved performance under the long-term stability test at a current density of − 0.5 A cm −2 for over 110 h at 800 °C, indicating excellent stability. Moreover, an electrolysis current density as high as 0.712 A cm −2 at 1.5 V was obtained for the full cell with the SLEF0.05 air electrode, which was 45.8 % higher than the SEF electrode when the temperature and feed gas were 800 °C and 50 % CO 2 –50 % CO, respectively. The XPS and cell testing results confirmed that La with high valance and small radius promoted the formation of oxygen vacancies and effectively enhanced the electrochemical performance and structural stability of the SEF material. Therefore, the R-P oxide SLEF0.05 is a promising air electrode material for SOECs.
研究领域:
材料科学
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电化学
·
能源材料
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催化
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2018
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IF 8.173
Jinhui Feng,Faying Li,Xiaojian Li,Yaoguang Wang,Dawei Fan,Bin Du,Yueyun Li,Qin Wei
A new, photoelectrochemical immunosensor was proposed on the basis of the La-CdS/3D ZnIn 2 S 4 /Au@ZnO sensitization structure for detection of aminoterminal pro-brain natriuretic peptides (NT-proBNP). The Au@ZnO-modified electrode was first assembled with 3D ZnIn 2 S 4 , and then further deposited with lanthanum doped cadmium sulfide (La-CdS) via successive ionic layer adsorption and reaction strategy. The Au@ZnO has excellent photoelectric activity and electrical conductivity . The ZnIn 2 S 4 with 3D architectures not only exhibit high photocurrent intensity under visible-light irradiation but also have large surface for the La-CdS deposition. Meanwhile, the La-CdS doped structure could depress the charge recombination, which effectively promotes separation of the generated electron-hole (e - /h + ) pairs and consequently enhances the photocurrent conversion efficiency. The polydopamine (PDA) was used not only as a cross-linker reagent for the immobilization of the anti-NT-proBNP but also as an electron donor for promoting the photo-generated e - /h + separation of the semiconductors. Under optimal conditions, the well-designed photoelectrochemical immunoassay exhibited a low detection limit of 0.32 pg mL −1 and a wide linear range from 0.8 pg mL −1 to 45 ng mL −1 for target NT-proBNP detection. Meanwhile, it also presented good reproducibility, specificity, and stability and might open a new promising strategy for the detection of other important tumor markers.
研究领域:
生物传感器
·
分析化学
·
材料科学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IEEE TRANSACTIONS ON ELECTRON DEVICES
·
2025
·
IF 3.2
Qian Gao,Gang He,Bo He,Yanmei Liu,Yongli He,Shanshan Jiang,Huanhuan Wei,Can Fu
The development of high-performance neuromorphic phototransistors plays a fundamental role in advancing image perception systems by enabling low-latency, event-driven light sensing and accelerating the training of memory-efficient deep neural networks. Here, artificial synaptic phototransistors with synaptic plasticity are fabricated based on La-doped In2O3 nanofibers (InLaO NFs), demonstrating an integrated artificial synapse that mimics both central and visual neural functions. The device exhibits not only exceptional electrical performance, with a high field-effect mobility of 7.70 cm2V-1s-1, an ultralarge ON/OFF current ratio (>1 × 108), but also a strong photoresponse of 28.2 nA under light illumination. Through excitatory response modes, fundamental biological functions, including excitatory postsynaptic current (EPSC), paired-pulse facilitation (PPF), and the transition from short-term plasticity (STP) to long-term plasticity (LTP), are simulated by the synaptic transistor. Furthermore, in optoelectronic co-modulation, the high synaptic weights enable the device to emulate complex neural learning rules relevant to neuromorphic applications, such as classically conditioned reflexes and image recognition tasks. These results highlight the potential of InLaO NFs-based synaptic transistors as promising candidates for bio-inspired synaptic devices and advanced neuromorphic systems.
研究领域:
神经形态工程
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纳米材料
·
光电子学
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人工智能
·
合成生物学
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神经科学
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材料科学
·
电气工程
✓ 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）