FUEL
·
2017
·
IF 4.601
Dongjing Liu,Weiguo Zhou,Jiang Wu
CuO-based and MnO x -based sorbents modified with Ce and La using sol-gel method, were employed for elemental mercury removal at 120–240 °C. The Hg 0 removal activity of Mn 2 O 3 /ZSM-5 can be significantly enhanced by doping 50 at.% Ce or 10 at.% La, the Hg 0 removal efficiency increased by 94% and 71%, respectively. The Hg 0 removal ability of CuO/ZSM-5 subtly improved by addition of 50 at.% Ce or 10 at.% La, the Hg 0 removal efficiency ascended only by 6% and 18%, respectively. The XPS results revealed that Hg 0 transformed to HgO, and CuO (or Mn 2 O 3 ) was reduced to Cu 2 O (or Mn 3 O 4 ), which is in agreement with Mars-Maessen mechanism.
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高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Han Shen,Xiaorong Meng,An Zhou,Zhifan Zhang,Pan Feng,Haigang Qin
This study employs a synergistic strategy combining La 3+ -doped modified VO 2 (B) (L x VO) with mesoporous hollow carbon spheres (MHCS) to prepare a high-capacity, highly stable MHCS-supported La-doped VO 2 (B) cathode material (HLVO). Optimizes the La 3+ doping ratio of L x VO and the MHCS content in HLVO, and the lattice expansion behavior of VO 2 (B) caused by La 3+ doping and the composite of carbon materials is clarified, which effectively contributes to the improvement of Zn 2+ diffusion kinetics rate and electrochemical performance of HLVO. The dynamic mechanism of LVO and HLVO is explained by density functional theory. The results show that the (110) interplanar spacing of 5 % La-doped L 0.05 VO increases to 0.355 nm. In the optimized H2L 0.05 VO, L 0.05 VO loose nanorods and MHCS are evenly distributed. The diffusion kinetic rate constant of Zn 2+ in HLVO is two orders of magnitude higher than that of VO 2 (B). At 1 A g −1 , the specific capacity of H2L 0.05 VO cathode remains at 403.5 mAh g −1 after 200 cycles, and the capacity retention rate is as high as 81.6 % after 10 A g −1 10000 cycles. The synergistic strategy of rare earth doping and carbon material composite provides a new idea for the development of high-performance aqueous zinc ion batteries (AZIBs) cathode materials.
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高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.5
Ziyao Wang,Sijia Huo,Meichen Pan,Yihan Qiu,Ying Tian,Ying Zhou,Wei Yan,Wen Wang,Yu Zhou,Xiaoming Duan
Lithium metal is considered an ideal anode material owing to its high specific capacity, low density, and low redox potential, but its practical use in liquid systems is hindered by dendrite growth and interfacial instability. Solid-state electrolytes (SSEs) offer high thermal stability and mechanical strength, with Li 7 La 3 Zr 2 O 12 (LLZO) particularly attractive for its high ionic conductivity and wide electrochemical window. Semi-solid-state electrolytes (SSSEs), integrating the advantages of SSEs and liquid electrolytes (LEs), can be further enhanced by introducing porous solid frameworks. Such structures improve wettability and transport while providing mechanical support that suppresses dendrites, thereby achieving both high conductivity and structural safety. In this work, a two-dimensional porous solid-state skeleton model was established to investigate the influence of porosity on lithium-ion transport. The percolation threshold was determined to be 47.91% porosity, indicating the minimum connectivity required for efficient ion migration. Based on these insights, a graphite-template sacrificial method was employed to fabricate a highly interconnected porous Li 6.25 Ga 0.25 La 3 Zr 2 O 12 (LGLZO) framework (P G LF). The ionic conductivity of the P G LF-LiPF 6 SSSE reached 3.02×10 -3 S cm -1 at room temperature. The constructed Li/Li cell can be stably cycled for more than 1600 h at 0.5 mA cm -2 , and the capacity retention rate of the LFP/Li cell was 91.62% after 2000 cycles at 2 C. In addition, similar properties can be achieved by replacing the formwork material (charcoal powder). This work established a correlation between porosity and ion transport performance, providing a promising preparation method for high-performance lithium metal batteries (LMBs).
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Bowen Wang,Xuyan Xue,Changshuai Gong,Xuejiao Wang,Qiushi Wang,Ji-Guang Li
A series of Tb 3+ substituted layered perovskite Sr(La 1- x Tb x )AlO 4 ( x = 0–1) was synthesized via solid-state reaction. The influence of Tb 3+ on the phase, structure, photoluminescence, and long afterglow properties of the SrLaAlO 4 product was investigated. The fully substituted product SrTbAlO 4 was found to be isostructural with its SrLaAlO 4 counterpart, and the crystal structure parameters were first reported in this work. Photoluminescence investigation found that benefiting from the unique layered crystal structure, the activator Tb 3+ was well separated and the optimal doping concentration was found to be as high as 20 at%. Except for photoluminescence, the products simultaneously show long afterglow properties due to disorder cations distribution in the local structure and thus induced defect condition. When the UV light source is turned off, the afterglow luminescence of SrLaAlO 4 : 0.03 Tb 3+ can last over 1 h. The trap distribution of SrLaAlO 4 : Tb 3+ was analyzed in detail by thermoluminescence. The trap depth is calculated to be around 0.7–0.81 eV, the value of which highly coincides with the ideal energy level for trapping and releasing electrons at room temperature. On the basis of the experimental results, the mechanism of long afterglow luminescence of SrLaAlO 4 : Tb 3+ is elaborated and discussed.
研究领域:
材料科学
·
光学
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高影响因子
THIN SOLID FILMS
·
2023
·
IF 2.1
Xin Gu,Shuaizhao Jin,Zhiyuan Yu,Xiaokun Zhu,Kaikai Wu,Liming Zhao,Yixin Yan,Qingming Chen,Xiang Liu
Herein, refined La x Ca 0.89- x Sr 0.11 MnO 3 (LCSMO, x = 0.65, 0.68, 0.71 and 0.74) films were prepared through the sol-gel spin-coating. The influence of La 3+ content on the structural properties of LCSMO films was investigated by X-ray diffraction and Atomic force microscope, demonstrating that LCSMO films can grow well on SrTiO 3 (00 l ) substrate. Besides, X-ray photoemission spectroscopy verified the double exchange (DE) effect was weakened with La 3+ dopant. The La 3+ doping and interconnected grains boundaries (GBs) led to the weakening DE effect and GBs scattering, respectively. Due to superior GBs connectivity, the resistivity of LCSMO films was less than 7.1 × 10 −4 Ω·cm at low temperature of 100 K. Importantly, it is an effective control method to keep the temperature ( T k ) corresponding to temperature coefficient of resistivity ( TCR ) at room temperature with Sr 2+ content as constant in LCSMO films. At x = 0.71, the peak TCR value was found to be 8.84%/K and corresponding T k was 283.15 K. These results are beneficial for advanced application of uncooling infrared bolometer.
研究领域:
材料科学
·
物理学
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Huasheng Lai,Gongke Li,Zhuomin Zhang
Improving the speediness of complex sample analysis has attracted much research interest in analytical science. In this work, an enrichment-sensing all-in-one strategy was presented for rapid surface-enhanced Raman spectroscopy (SERS) analysis of purine components by using the La(OH)3-Au@AgNPs nanocomposite. Two-dimensional (2D) La(OH)3 nanosheets with nanothickness and accessible active sites not only acted as efficient media for the rapid enrichment of analytes but also provided flat planes for the intensive decoration of Au@AgNPs nanoparticles to amplify the SERS signals of adsorbed analytes. The nanocomposite could realize the rapid enrichment-sensing of purine components in 1 min, including mercaptopurine, thioguanine, adenine, and purine. Subsequently, the surface adsorption behaviors were explored by density functional theory and the enhancement mechanisms were simulated by the finite-difference time-domain method. Moreover, the nanocomposite also exhibited good SERS performances with relative standard deviations (RSDs) of uniformity less than 6.5% (n = 23), RSDs of batch-to-batch stability less than 7.3% (n = 9), and long-term stability over 9 weeks with RSDs within 6.6%. Finally, the enrichment-sensing strategy was applied for the rapid SERS analysis of two projects: mercaptopurine in tablets and adenine in beers with detection limits of 6.0 and 0.76 μg/L and spiked recoveries of 90.9–100 and 84.2–101%, respectively. Benefiting from the high-performance enrichment medium and closely packed plasmonic nanoparticles, the enrichment-sensing all-in-one strategy possesses great potential for rapid on-site detection in food safety and pharmaceutical analysis.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yuan Luo,Yaru Peng,Yimeng Li,Yage Li,Chuchu Feng,Ronghua Li,Bin Gao,Ran Xiao,Xiu Zhang,Guangzhou Qu,Manlin Li,Ashour A. Ahmed,Samir G. Al-Solaimani,Peter S. Hooda,Jörg Rinklebe,Zengqiang Zhang,Sang Soo Lee,Sabry M. Shaheen
Removal of nutrients and pollutants from water using structured adsorbents is of great interest. Lanthanum (La) oxide/hydroxides and their derivative composites are promising platforms for phosphate (P) removal from wastewater. However, various key factors including crystal structure, specific surface area (S BET ) and crystallinity restrict their P removal performance. In this study, LaOCl, a novel adsorbent with tetragonal crystal, and La 2 O 3 , a traditional adsorbent with hexagonal crystal, were prepared at different calcination temperatures and tested as P adsorbents. Due to different crystal structures, LaOCl and La 2 O 3 exhibit significant differences in P adsorption. LaOCl crystal is more stable than La 2 O 3 in solution. The main LaOCl crystal phase is not changed after P adsorption, while La 2 O 3 transformed into La(OH) 3 due to proton capturing form H 2 O. The Cl − on LaOCl can be used as a ligand for P ions exchange. It is different from OH − exchange which increases the pH sharply. The isoelectric points (IEP) of LaOCl is slightly higher than La 2 O 3 . All of these factors, caused by the different structures of LaOCl, keep its P adsorption capacity and rate high in acidic conditions. The Langmuir maximum P adsorption capacity of LaOCl is 164.52 mg/g, which is 2.3 times greater than La 2 O 3 . The LaOCl adsorbent exhibited a faster adsorption rate than La 2 O 3 . It is able to reduce the H 2 PO 4 − concentration from 50 mg/L (pH ∼ 5.0) to < 0.002 mgP/L in 180 min, while the residual P concentration is about 11.27 mgP/g by La 2 O 3 in the same time. The P adsorption capacity was found positively correlated with crystallinity at pH 3.0 but with S BET only in pH 5.0 ∼ 9.0 range for LaOCl. However, S BET and crystallinity are not the main factors influencing the P adsorption capacity of La 2 O 3 . Following P adsorption, both adsorbents were verified for P desorption. The results showed the amount of P desorbed was small, thus the adsorbents have the ability to lock P in natural water. Overall, this study provides essential perspectives on the effects of crystal structure, surface area, and crystallinity on P adsorption and the scientific basis for developing new and functionalized La-based adsorbents.
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高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Ke Sun,Haibin Lin,Rui Zhang,Jinlong Zhu,Liping Wang,Songbai Han,Xiaofei Wang
The emerging laser-driven phosphor-converted white laser diodes (w-LDs) demand highly efficient and thermally stable color converters. To this end, the Ce 3+ luminescence in the rekindled La–Si–O–N host, and the impacts of NH 4 Cl flux and post-processing are investigated systematically. On the basis of the XRD results, well crystalline Ce 3+ -doped La 5 Si 3 O 12 N and LaSiO 2 N are obtained at 1600 °C for 5 h and 1500 °C for 4 h, respectively. Impressively, the representative La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ exhibit a broad excitation band from 240 nm to 400 nm, peaking at around 360 nm, which is well matched with emission from near-UV (n-UV) chip. Under excitation by a n-UV laser, the La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ produce bright blue light in a wide emission band from 360 nm to 550 nm. The CIE chromaticity diagram reveals the tunability of the hue of these phosphors. The quenching temperature is determined to be 396 K and 429 K for La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ respectively, indicating superior thermal stability. The addition of 3 wt% NH 4 Cl flux much enhances the emission intensity of both La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ . Furthermore, the post-treatments markedly improve the luminescence properties by increasing the crystallinity , reducing the surface defect , and changing the morphology. Therefore, it is believed that the present work has promising applications in LD lighting and promoting the development of laser display.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chao Zhu,Futao Li,Shaowen Ji,Zhengyan Li,Xiangping Chen
Recycling valuable metals from spent nickel-metal hydride (NiMH) batteries has significant environmental and economic benefits. This study aimed to separate and recover nickel (Ni), cobalt (Co), cerium (Ce), lanthanum (La), and neodymium (Nd) from waste NiMH batteries using ion-exchange fibers as the adsorbent material in an adsorption chromatography process. Static adsorption experiments showed the metal adsorption processes followed the Langmuir model, indicating mono layer coverage, and quasi-second order kinetics, suggesting chemisorption. In the chromatographic separation study, optimal conditions of pH 2, 1/10 diluted feed solution, fully packed column, 3 mL/min flow rate, and 0.2 mol/L acid elution enabled effective separation of the five metals. According to distribution coefficients, the metals were preferentially adsorbed in the order: Nd 3+ > La 3+ > Ce 3+ > Co 2+ > Ni 2+ . Transition metals Ni 2+ and Co 2+ were first separated from rare earths Ce 3+ , La 3+ and Nd 3+ . Subsequently, good separation among the rare earth elements was achieved. After ten adsorption-desorption cycles, the fibers maintained excellent stability with only 9.2 % capacity loss. The results demonstrate the adsorption chromatography method can efficiently recover mixed metals from waste NiMH batteries individually for full value utilization.
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CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Chuancheng Zhang,Shoujun Ding,Wenzhi Su,Miaomiao Wang,Haitang Hu,Yong Zou,Wenpeng Liu,Qingli Zhang
Inhomogeneous broadening in disordered crystals has been widely recognized as a successful approach to enhance the spectral bandwidth of rare earth ions in optical spectra, and the Yb3+-doped mixed laser crystals are known as ultrafast pulse materials and have emerged as a hotspot recently. In this study, mixed sodium gadolinium/lanthanum double molybdate disordered laser crystals NaGd(1–x)La(x)(MoO4)2 with x = 0.3, 0.5, and 0.9 were grown by the Czochralski (Cz) method. The structure of as-grown crystals was investigated by XRD, SEM, FT-IR, and Raman experiments. The spectroscopic properties, including absorption, emission, and fluorescence decay characteristics, were investigated thoroughly. The NaGd0.5La0.5(MoO4)2 (NGLM) composite crystal exhibited an exceptionally broad absorption which reaches 70 nm (fwhm) at 980 nm, exceeding those of NaGd(MoO4)2 (NGM) and NaLa(MoO4)2 (NLM). Additionally, the electronic structures (band structure and density of states) of NGM, NGLM, and NLM were determined from the first-principles method combined with the PBE function. The calculations of defect formation energies under O-poor and O-rich conditions demonstrate that the +2 defects are easily generated in the undoped NGM crystal prepared under reducing atmospheres, and the calculation of absorption properties reveals that the black color of NGM without annealing is mainly attributed to intraband transitions between defect induction states and VBM or CBM. Moreover, the lifetimes of excited energy level 2F5/2 of Yb3+ were examined under different experimental environments to obtain the intrinsic radiative lifetime, and the emission cross section was calculated as 2.25 × 10–20 cm2 at 1016 nm. The features of the Yb3+:NaGd(1–x)La(x)(MoO4)2 crystal indicate the potential applications for ultrafast and broad tunable laser through slight regulation of the composite engineering strategy.
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高影响因子
POLYMER INTERNATIONAL
·
2011
·Vol. 60
·期 9
·1355-1361
·
IF 2.056
Xiaonan Zhu,Yihu Song,Shaohui Chen,Peihua Du,Qiang Zheng
An acrylate processing aid (ACR)-based ionomer containing lanthanide (La(III)) ion was synthesized and the influences of the ionomer on thermal stability, fusion time, transparency and tensile properties of rigid poly(vinyl chloride) (PVC) were investigated. Results revealed that the ionomer with a suitable La(III) content behaved as a good stabilizer as well as processing aid to the rigid PVC product. The ionomer could accelerate fusion of PVC much more quickly than ACR because of the strong interaction between La(III) carboxylate and PVC. Moreover, it exhibited a stabilizing efficiency comparable to lanthanum and calcium stearates (LaSt 3 and CaSt 2 ). The composite stabilizer of ionomer/zinc stearate (ZnSt 2 ) exhibited an ability to improve initial discoloration better than LaSt 3 /ZnSt 2 and CaSt 2 /ZnSt 2 because the ionomer could form a complex with ZnSt 2 much more slowly than LaSt 3 and CaSt 2 . The compounds stabilized using ionomer/ZnSt 2 exhibited a transparency comparable to those stabilized using organotin or liquid barium/zinc stabilizers, which was much better than those stabilized using LaSt 3 /ZnSt 2 and CaSt 2 /ZnSt 2 . Copyright © 2011 Society of Chemical Industry
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Juan Bi,Yuxin Liang,Yang Bai,Baoning Cui,Zhaopeng Lu,Bangsheng Li
Some studies have proven the effectiveness of high-entropy alloying in reducing lattice thermal conductivity; however, the synchronous degradation in carrier mobility limits the thermoelectric properties of high-entropy materials. Herein, we present a series of medium-entropy oxides (Sr 1/3 Ba 1/3 Ca 1/3 ) 1-x La x TiO 3 (x = 0.05, 0.1, 0.15) with different levels of La doping, breaking the trade-off between carrier and phonon transport. The medium-entropy design helps keep the carrier mobility at a moderate level while modulating the carrier concentration through La 3+ doping, thereby yielding a peak power factor value of 1842 μW/(m⋅K 2 ) at 773 K. Meanwhile, the incorporation of nano-micro-porous structure and medium entropy effect leads to a significant reduction in lattice thermal conductivity, reaching 2.3 W/(m⋅K) at 1073 K. Consequently, a ZT max value of 0.67 is obtained for the MEP-10La sample at 1073 K, which is one of the state-of-the-art ZT values reported for the SrTiO 3 -based materials. The present work provides a viable approach for the development of thermoelectric materials with enhanced performance.
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