IONICS
·
2023
·Vol. 29
·期 7
·2549-2561
·
IF 2.8
Peng Jiaqi,Wei Yuanyuan,Hu Bin,Zhang Liang,Huang Jinfu,Tang Hongyu,Huang Bin,Li Yanwei,Chen Shaojun,Xiao Shunhua
Due to the urgency of developing high energy density cathode materials in power batteries, as well as the high price and environmental unfriendliness of cobalt, researchers are working on ultra-high nickel low cobalt and ultra-high nickel cobalt-free layered cathode materials. However, the poor cyclic stability and rate performance of this material resulted from structural instability and severe surface/interface side reactions during cycling seriously hinder its practical application. In this paper, LiNi 0.9 Mn 0.1 O 2 (NM90) cathode material is modified by La 2 O 3 coating, and La 3+ doping caused by thermal diffusion is achieved simultaneously. The synergistic enhancement of the two modifications can effectively improve the layered structure and reduce surface/interface side reactions. The dual-modified material shows good structural stability, the La 2 O 3 coating does not fall off and the active material does not appear fragmentation and collapse after 100 cycles. At the same time, the dual-modified material also shows excellent electrochemical performance, with a capacity retention of 83.19% after 100 cycles at 1 C and a reversible capacity of 129.9 mAh g −1 at 10 C. The electrochemical mechanism reveals that the dual-modified material effectively reduces the charge transfer resistance and greatly increases the Li + diffusion coefficient. It will provide useful reference and technical support for the research of other electrode materials. Graphical abstract The NM90 and La 2 O 3 -coated NM90 particles have similar spherical morphology and are formed by the agglomeration of many primary particles; the surface of NM90 material is evenly coated by La 2 O 3 and No obvious boundary between La 2 O 3 and NM90 materials is found; LiNi 0.9 Mn 0.1 O 2 cathode material coated by 1wt% La 2 O 3 has the best cycle stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Junying Fu,Min Lu,Kejing Fang,Pengmei Lv,Zuhong Xiong
Biodiesel, a renewable liquid fuel, is undergoing eco-transition in catalyst research and development. Calcium oxide (CaO) was a widely studied heterogeneous catalyst due to its considerable activity. However, the poor stability of CaO during storage in air, especially by CO2 and H2O poisoning, presents a challenge. This research successfully developed a high-activity CaO/La2O3 catalyst for biodiesel production with CaO nanoparticles well-dispersed on the La oxide support (Ca/La=0.12). Under mild reaction conditions, a fatty acid methyl esters (FAMEs) yield of 96.9% was achieved. After exposure to air for two weeks, the CaO/La2O3 (Ca/La=0.12) catalyst absorbed 49% less CO2 and 91% less water than pure CaO and keeps 71.4% of the original activity. Thermogravimetric and in-situ Fourier Transform Infrared Spectroscopy analysis reveal that CO2 and H2O will preferentially be captured by La oxides and keep the supported CaO active sites safe. DFT calculations confirmed that CO2 and H2O adsorption on CaO terrace sites became an unfavoured process due to lattice compression of CaO nanoparticles on La2O3, which imparts the CO2/H2O-proof property to CaO/La2O3 catalyst. Methanol adsorption, dissociation, and migration pathways on CaO/La2O3 that produce active methoxy anions at Ca-La interfaces were identified as key steps in achieving efficient catalytic reactions.
研究领域:
化学工程
·
催化材料
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Linlin Hao,Gewei Feng,Zengli Zhai,Mingxuan Li
It has been accepted that limiting phosphate is a prerequisite for bacterial inactivation in tap water. La 2 O 3 nanoparticles were loaded onto polypropylene (PP) fibers through the method of melt spinning. Hydrophilic modification of the adsorbent surface was performed using polyethyleneimine (PEI) to prepare PEI/La 2 O 3 /PP. The results indicated that the optimal loading amount of La 2 O 3 was 1 %, and the optimal concentration of PEI was 1 %. The successful loading of La 2 O 3 resulted in a roughened fiber surface and increased fiber diameters . After PEI modification the water contact angle was reduced from 98° to 50°. The pH zpc of PEI/La 2 O 3 /PP was determined to be 8.3. The co-existing ions have little effect on phosphate adsorption. Phosphate adsorption can be well described by Redlich-Peterson model with a maximum K R-P of 3.98 × 10 −5 L/mg. Adsorption kinetics fit well with the pseudo-second-order reaction equation. The activation energy (E a) is determined to be 57.9 kJ/mol, providing the evidence of chemical nature of the reaction involving phosphate ions on the surface of PEI/La 2 O 3 /PP. The PEI/La 2 O 3 /PP adsorbent can reduce the phosphate concentration in tap water to below 0.01 mg/L, leading to a reduction in Escherichia coli concentration from approximately 10,000 CFU/mL to around 10 CFU/mL. The survival rates of Escherichia coli in a multi-nutrient environment are higher than in a single phosphate source environment. Our research provides a new feasible approach for ensuring microbial water quality safety in household water purifiers.
研究领域:
环境科学
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材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2017
·Vol. 32
·期 3
·e4201
·
IF 2.319
Mengqiu Huang,Jiasheng Fang,Yiwei Zhang,Chao Zhang,Yuming Zhou,Shuo Zhao,Yan Gao,Xiaoli Sheng
A novel magnetic binary-metal-oxide-coated nanocataly composing of a hollow Fe 3 O 4 core and CeO 2 -La 2 O 3 shells with Au nanoparticles encapsulated has been created in this work. The structural features of catalysts were characterized by several techniques, including SEM, TEM, UV-vis, FTIR, XRD, XPS and TGA analyses. After the coating of CeO 2 -La 2 O 3 layer, CeO 2 -La 2 O 3 /Au/C/Fe 3 O 4 microspheres showed a superior thermal stability and catalytic reactivity compared with a pure CeO 2 or La 2 O 3 layer. Accompanied by the burning of carbon layer, the specific surface could be increased by the formation of double-shelled structure. Besides, the desired samples could be separated by magnet, implying the superior recycle performance. Using the reduction of 4-nitrophenol by NaBH 4 as a model reaction, the microspheres exhibited highly reusability, superior catalytic activity, thermal stability, which are attributed to the unique double-shelled structure of the support, uniform distribution of Au nanoparticles, the highly thermal stability of CeO 2 -La 2 O 3 layer and mixed oxide synergistic effect. As a consequence, the unique nanocatalyst will open a promising way in the fabrication of the double-shelled hollow binary-metal-oxide materials for future research and has great potential in other applications.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Zhiqian Yao,Feng Liu,Suqiong Xu,Xianke Zhang,Chuicai Rong,Zuzhou Xiong,Jujun Yuan,Yi Yu,Xiurong Zhu,Huajun Yu
Prussian blue, a member of the metal-organic frameworks (MOFs), has attracted great interest in electromagnetic wave absorption due to its unique properties, such as multiple morphologies and tunable structures. In this paper, La 2 O 3 /Co@N-doped carbon nanotubes (La 2 O 3 /Co@NCNTs) composites were synthesized by thermal annealing La[Co(CN) 6 ]·5H 2 O Prussian blue analogue (LaCo-PBA) precursors under an Argon (Ar) atmosphere. The studies of electromagnetic wave absorption show that La 2 O 3 /Co@NCNTs demonstrated the minimum reflection loss (RL) of −53.40 dB with the effective absorption bandwidth (EAB) of 4.34 GHz at the thickness of 2.45 mm. These excellent microwave absorption properties are attributed to multiple loss mechanisms, including conduction loss , polarization loss, magnetic resonance loss, and eddy current loss . This study offers a new possibility for the design of multifaceted lightweight carbon-based microwave absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2024
·
IF 4.2
Dezhi Wang,Yanzhen Lu,Ye Gao,Shuai Ma,Xin Li,Zhuangzhi Wu
With the rapid development of the photovoltaic industry, tungsten alloys have been selected to replace the high‑carbon steel to fabricate the busbars for diamond wire saws due to their superior mechanical properties, and the La 2 O 3 doped tungsten alloy has been widely used. However, the yield of eligible W alloy wires is not very high due to serious wire breakage problems during the production process, especially in the solid-liquid mixing route. To discover the possible reason, the commonly produced lanthanum tungstate (La 30 W 17 O 96 ) in the solid-liquid mixing route has been systematically studied in the work, and its possible influence on the mechanical properties is also explored. It is found that the La 30 W 17 O 96 leads to the formation of brittle second phases at grain boundaries (GBs), which weakens the intergranular bonding, resulting in a significant decrease in the compressive strength of tungsten alloys, manifested as intergranular fracture. Transmission electron microscopy (TEM) analysis reveals that these second phases are consisted of polycrystalline La 6 W 2 O 15 , La 2 W 3 O 12 and amorphous states, and the La 30 W 17 O 96 can decompose into a more stable structure during sintering. This work highlights the destructive effect of La 30 W 17 O 96 on the intrinsic properties of tungsten alloys and provides a new perspective for solving the problem of tungsten wire breakage.
研究领域:
材料科学
·
冶金学
·
机械工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Ting Ren,Jufeng Zhang,Ding Wang,Peng Dong,Jianguo Duan,Xue Li,Shuai Rao,Dianhua Huang,Yingjie Zhang
The major limitations of layered LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode materials are their severe capacity decay and marked impedance increase under a high cutoff voltage. Herein, a LiNi 0.5 Co 0.2 Mn 0.3 O 2 powder was successfully encapsulated by a compact and continuous La 2 O 3 thin layer via a facile freeze-drying method. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy , and X-ray photoelectron spectroscopy. The excellent thermal stability and favorable lithium ion conductivity of the La 2 O 3 -modified sample lead to a substantial improvement in its electrochemical performances. In particular, the coated sample exhibits a capacity retention of 80% at 1 C over 150 cycles, while that of the bare electrode is only 58% at a high cutoff voltage of 4.6 V. The alternating current impedance and cyclic voltammetry tests reveal that the La 2 O 3 coating can reduce the cell polarization and enhance the electrochemical activity of cathode materials .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Yu-Jie Zhong,Hong-Bin Dai,Yuan-Yuan Jiang,De-Min Chen,Min Zhu,Li-Xian Sun,Ping Wang
Hydrous hydrazine has received increasing attention as a promising hydrogen carrier owing to its many favorable attributes, such as high hydrogen content, low material cost, stable liquid state at ambient conditions, and free of solid decomposition byproduct. Herein, we report the synthesis of a supported core–shell structured Ni@Ni–Pt/La 2 O 3 catalyst by a combination of co-precipitation and galvanic replacement methods. The catalyst exhibits high catalytic activity and 100% selectivity towards hydrogen generation from hydrous hydrazine at mild conditions, which outperforms most reported hydrous hydrazine decomposition catalysts. The favorable catalytic performance of the Ni@Ni–Pt/La 2 O 3 catalyst is correlated with the Pt-induced electronic and geometric modifications on the catalyst surface .
研究领域:
催化
·
材料科学
·
能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Zhaoyubo Zeng,Yunzhong Liu,Feng Qian,Jianxiu Guo,Min Wu
Yttria , yttria-ceria and yttria-ceria-lanthana stabilized zirconia powders were prepared by coprecipitation . Their tetragonal-to-monoclinic phase (t→m) transformation was investigated by calcining the powders in a temperature range of 400–1400 °C for 2 h. The results show that after doping with 0.1 to 0.3 mol.% La 2 O 3 and calcining at 1400 °C in air, unusual redox behaviours of cerium were detected in the 1.5 mol.% Y 2 O 3 +5.5 mol.% CeO 2 co-stabilized zirconia. Grain refinement and a sharp reduction in oxygen vacancy concentration were observed simultaneously. The t→m transition was not found in the 0.1 mol.% La 2 O 3 doped zirconia but appeared in the cases with a higher dopant content. The changes are discussed with regards to the grain size, valence change of cerium, presence of oxygen vacancies, and segregation of the dopants at grain boundaries.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Minpeng Lei,Yun Lei,Shiding Wang,Dongfang Yang,Shaoyuan Li,Wenhui Ma
Spent nickel-metal hydride (NiMH) batteries are a significant secondary resource for recovering rare earth elements (REEs), particularly lanthanum (La). However, extracting La from the La 2 O 3 -containing oxide slag generated during pyrometallurgical recycling remains a major challenge. This study proposes a novel approach to address this issue by synergistically extracting La from La 2 O 3 -containing oxide slag while simultaneously upgrading metallurgical-grade silicon (MG-Si, 99.2%) to high-purity Si (99.991%). The process begins with the extraction of La from the La 2 O 3 -containing oxide slag using MG-Si as a reductant, yielding a useful Si-La alloy. This is followed by a three-stage leaching process to further separate the Si-La alloy and purify the Si powder. In the primary leaching stage, the Si-La alloy powder is separated into a La-containing acidic solution and residual Si powder using HCl solution. In the secondary leaching stage, Fe impurities in the residual Si powder are removed using a mixed acids solution of HF and HCl. In the tertiary leaching stage, the Si powder is further purified to 99.991% using HCl. Finally, the La ions in the La-containing acidic solution are selectively precipitated using hydrofluoric acid (HF) and ammonia (NH 3 ·H 2 O), respectively, resulting in high-purity LaF 3 (96.2%) and LaOCl (99.4%). This new method simultaneously recovers La from La 2 O 3 -containing oxide slag and enhances Si purity from 99.2 to 99.991%.
研究领域:
冶金学
·
材料科学
·
回收技术
·
稀土元素加工
·
电池废弃物管理
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2018
·
IF 3.956
Qilei Yang,Ang Cao,Na Kang,Kang An,Zhao-Tie Liu,Yuan Liu
The catalyst for direct ethanol synthesis (DES) from syngas was investigated in this work, which is Co/La 2 O 3 -doped La 4 Ga 2 O 9 . The catalyst was prepared by using LaCo 1−x Ga x O 3 with perovskite phase as the precursor to intensify the interaction in the elements of Co, La and Ga. The catalysts were characterized by using XRD , H 2 -TPR, TEM , EDS, XPS , BET, ICP and TG techniques. This catalyst showed high selectivity to ethanol and excellent stability including excellent resistance to sintering and carbon deposition . It seems that the ethanol is generated in the interface between metallic Co and La 4 Ga 2 O 9 , and in the interface cobalt would be positively charged due to the interaction between Co nanoparticles and La 4 Ga 2 O 9 . The results and the related discussions indicate that Co/La 2 O 3 -doped La 4 Ga 2 O 9 catalyst is a promising catalyst for DES from syngas. Graphical abstracts.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Bo Xu,Zaichun Liu,Weibin Qiu,Qian Liu,Xuping Sun,Guanwei Cui,Yuping Wu,Xiaoli Xiong
Identification of new effective and selective N 2 reduction electrocatalyst is still of critical importance for fundamental and application research. Here, we report La 2 O 3 nanoplate performing as an efficient metal oxide catalyst for electrochemical N 2 fixation to NH 3 , which exhibits excellent selectivity and stability with a high Faradaic efficiency of 4.76% and a NH 3 yield rate of 17.04 μg h −1 mg −1 cat. at −0.8 V vs. reversible hydrogen electrode (RHE) in 0.1 M Na 2 SO 4 solution under atmospheric pressure. Density functional theory (DFT) calculation results show that La atoms in La 2 O 3 act as the active sites for efficiently adsorbing N 2 . The optimal adsorption approach of N 2 molecule on the (011) face of La 2 O 3 is end-on-two configuration which is highly activated. Thus La 2 O 3 exhibits high performance for electrochemical reduction of N 2 .
研究领域:
电化学
·
催化
·
材料科学
·
理论化学
✓ 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）