JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Ren Peng,Yang Yang,Liu Dai,Guan Cheng-peng,Huang Pin-wen,Qi Ming
A novel extraction process utilizing THEE-BisDGA ligand has been developed for the rapid and efficient recovery of trivalent lanthanide elements (La, Nd, Eu, and Dy) from uranium-containing acidic systems. The process rapidly achieves equilibrium within just 2 min and exhibits high distribution ratios. Notably, its extraction efficiency shows a positive correlation with the atomic number of the lanthanides. Significantly, the ligand demonstrates exceptional selectivity by excluding U(VI) extraction, thus enabling the targeted recovery of lanthanides. Back-extraction experiments confirm that 0.01 M HNO 3 can quantitatively strip lanthanides in three steps, highlighting its potential for industrial-scale separation and purification of valuable lanthanides. Moreover, density functional theory(DFT) calculations have confirmed that THEE-BisDGA exhibits superior selectivity for Ln(III) over U(VI), further reinforcing its effectiveness and applicability in advanced separation technologies.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhiyuan Pan,Sihan Feng,Fan Li,Xuejiao Wang,Qi Zhu,Ji-Guang Li
Near-infrared phosphor converted light-emitting diodes (NIR pc-LEDs), as a state-of-the-art type of NIR sources, are finding multifaceted applications, where phosphor is a crucial component. In hope to provide new choices for NIR lighting, we synthesized in this work the two series of Ruddlesden -Popper type layered perovskite phosphors of SrLa 2 Al 2- x O 7 : x Cr 3+ ( x = 0–0.02) and SrLa 2- y Gd y Al 1.984 O 7 :0.016Cr 3+ ( y = 0–2), followed by detailed structure and luminescence investigation. SrLa 2 Al 2- x O 7 : x Cr 3+ was found to emit ∼700–800 nm NIR light under UV excitation and be able to maintain ∼54.3 % of its room temperature intensity at 423 K, which is remarkably higher than those (∼25–30 %@423 K) of the Mn 4+ activated perovskite NIR phosphors. Luminescence regulation was achieved by substituting La 3+ with Gd 3+ , and it was revealed that Gd 3+ may act as a sensitizer to significantly enhance Cr 3+ luminescence (∼346 % at 77 K) through Gd 3+ → Cr 3+ energy transfer, which was confirmed by spectral and fluorescence lifetime analysis. The observed spectral features and the influence of Gd 3+ were rationalized by considering crystal structure, local coordination, and crystal field. Finally, an NIR pc-LED device showing strong ∼700–900 nm luminescence was fabricated to show potential application of the phosphor in night vision and plant lighting.
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高影响因子
International Journal of Electrochemical Science
·
2024
·
IF 1.3
Dandan Liang,Weili Hou,Ying Zhang,Jihua Shang,Haibo Ren,Yufeng Sun
Due to the prevailing energy shortages, the pursuit of new alternative energy sources is becoming increasingly urgent. Hydrogen production through water electrolysis has emerged as a crucial method. However, the sluggish four-electron reaction in the oxygen evolution reaction (OER) remains the primary rate-limiting step. In this study, we synthesized a heterostructure La(OH) 3 @CuO-P material on the nickel foam (NF) substrate. The experimental results demonstrate that after phosphating treatment, the heterostructure La(OH) 3 @CuO-P exhibits exceptional catalytic performance with only 215 mV overpotential, a Tafel slope value of 79.36 mV/dec, and a bilayer capacitance of 39.02 mF/cm 2 at a current density of 10 mA/cm 2 for OER in a 1 M KOH solution. These values are significantly superior compared to those obtained using heterostructure La(OH) 3 @CuO alone which showed an overpotential value of 365 mV at a current density of 10 mA/cm 2 . Moreover, during cyclic voltammetry testing for up to 500 cycles, La(OH) 3 @CuO-P also demonstrates relatively stable performance. Analyses suggest that composite heterostructure effectively addresses issues such as insufficient conductivity of La(OH) 3 and monomer aggregation tendency for CuO while maintaining excellent properties for each component. By incorporating P atoms as dopants, the interaction between La, Cu, and P atoms not only facilitates fine-tuning of the electronic structure and optimization of the adsorption free energy (-OH), but also promotes an increase in catalytic active sites through sample size reduction, thereby further augmenting the performance of the OER.
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高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yuanzhen He,Dengjie Zhong,Yunlan Xu,Ran Jiang,Pengfei Liao,Jiayou Zhang
In this work, Ti/SnO 2 -Sb 2 O 4 -La/β-PbO 2 electrode was successfully prepared by electrodeposition method. The surface morphology, crystal structure, elemental states and electrochemical characteristics of the electrode were examined by SEM, XRD, XPS, CV, and LSV. The results demonstrated that the conductivity, specific surface area, electrochemical oxidation performance and stability of the β-PbO 2 coated electrode with SnO 2 -Sb 2 O 4 -La as the intermediate layer were greatly improved. Under the conditions of initial rhodamine B (RhB) concentration of 20 mg/L, initial pH of 3.0, electrolyte concentration of 0.1 M, and current density of 30 mA cm −2 , the removal rates of color and TOC reached 100 % and 83.64 % after 20 mins and 30 mins, respectively. The electrode can also completely degrade methylene blue and methyl orange wastewater after 30 mins under the same conditions. The accelerated lifetime of the electrode reached 175 mins (1000 mA cm −2 , 1 M H 2 SO 4 ), and the actual lifetime was up to 3208 hrs. Based on the results of free radical quenching experiment and GC–MS detection, RhB degradation pathway was proposed: the aniline-based conjugated system of RhB molecule was attacked by the combined action of free radicals (indirect oxidation) and electrocatalysis (direct oxidation), which decomposed macromolecules into small molecules and ultimately mineralized them into CO 2 and H 2 O. This work is expected to provide a fresh research concept for preparing DSA electrodes with excellent catalytic performance and high stability.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Mengfan Bao,Shijie Chen,Hongxiang Xie,Cuihong Zheng,Juan Chen,Aiqin Mao,Saisai Li
Transition-metal-based high-entropy oxides (HEOs) have gained significant attention as advanced anode materials for lithium-ion batteries (LIBs) owing to their compositional flexibility and entropy-driven structural stabilization. However, the low intrinsic conductivity and unsatisfactory rate capability remain largely unresolved. Herein, a unique hollow/mesoporous La(Cr 0.2 Fe 0.2 Co 0.2 Ni 0.2 Mn 0.2 )O 3 HEO is developed through an innovative sacrificial template-assisted solution combustion synthesis. As expected, the as-synthesized HEO exhibits a hollow/mesoporous spherical structure with a 49.0 m 2 g -1 surface area and 60.2% surface oxygen vacancy concentration, synergistically facilitating the electronic/ionic transport kinetics and structural stability, and demonstrating an interfacial charge storage mechanism. Benefiting from these combined properties, the engineered hollow/mesoporous HEO anode demonstrates superior rate capability (281 mAh g -1 at 3000 mA g -1 , ∼59% retention of its initial 475 mAh g -1 at 100 mA g -1 ), while maintaining unprecedented cycling stability with 1288 mAh g -1 after 250 cycles at 200 mA g -1 and 1246 mAh g -1 even after 900 cycles at 1000 mA g -1 with continuous capacity enhancement during prolonged cycling. This study establishes a paradigm for enhancing high-rate capabilities in HEO-based anodes through rational morphological design, providing new insights into structure-performance relationships for next-generation LIB applications.
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高影响因子
Small
·
2025
·
IF 12.1
Xin Chen,Jiahui Wu,Jingyao Zeng,Caiyan Shen,Yuejun Wang,Yangyang Xie,Guorong Hu,Ke Du,Zhongdong Peng,Yanbing Cao
Due to the strong electronegativity of P in the anion group and the strong P─O covalent bond, NFPP exhibits low electronic and ionic conductivity, hindering its rate capability. A doping modification strategy of selecting La 3+ with a large ion radius at Na site has been designed, and the nano-micro architectural Na 4-3x La x □ 2x Fe 3 (PO 4 ) 2 (P 2 O 7 )/C (0≤x≤0.04) cathode material with Na vacancies is successfully synthesized via a scalable preparation route. Introducing positively charged substitutional point defects and charged vacancies through doping La 3+ not only broadens the Na + transport channels but also reduces lattice stress and stabilizes the crystal bulk structure during long-term cycling for La 3+ as pillars. Additionally, high valence La 3+ doping enhances the effective charge carrier concentration and improves material conductivity. Consequently, the kinetic performance of Na + migration is significantly enhanced. The optimal Na 3.91 La 0.03 □ 0.06 Fe 3 (PO 4 ) 2 (P 2 O 7 )/C (NFPP/C-La3) exhibits the best electrochemical performance. The synthesized NFPP/C-La3 exhibits excellent rate performance (99.45 mAh g −1 at 20 C) and long-term cycle stability (92.36% of capacity retention over 1000 cycles at 10 C). These results provide the importance and prospect of the high valence ion doping for NFPP/C with high rate stability.
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DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Zhu Xueli,Yin Xiangru,Zhang Yinan,Mei Qiqi,Bai Jinshuo,Yang Guixiang,Zhang Dequan,Liang Xiaoping
V 2 O 5 films with high ion storage capacity (Q) and wide optical modulation range (∆T) have great potential for application in electrochromic devices. In this paper, Ni-La-V 2 O 5 porous ion storage films are prepared by the sol–gel method. The effects of Ni-La co-doping content, PEG content, and heat treatment temperature on the properties of V 2 O 5 films were investigated. By comparison, it was found that the Q value of 9 mol% Ni-5.5 mol% La-V 2 O 5 film was increased compared to 9 mol% Ni-V 2 O 5 film, but ∆T was decreased. In order to improve ∆T, Ni-La-V 2 O 5 porous ion storage films were prepared using Ni-La co-doping and PEG pore-former, and the optimization of process parameters was carried out via Response Surface Methodology (RSM). The RSM results showed that the influence on the Q value was in the following order: heat treatment temperature > Ni-La co-doping content > PEG content. Under the near-optimal process parameters, a satisfying V 2 O 5 film with a high Q value (120.23 mC/cm 2 ), a good ∆T (79.8%), and a short response time (3.1 s/2.8 s) were obtained, which further demonstrated the superior electrochromic performance. Graphical
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高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 19
·195708
·
IF 3.874
Xuewen Xia,Junqi Li,Chaoyi Chen,Yuan-Pei Lan,Xisong Mao,Fusheng Bai
Morphological tuning or additional cation doping is one of the potential and simple methods to enhance the photocatalytic properties of ceria, in which rare-earth element doped ceria nanorods (CeO2-RE NRs) are expected to be a promising photocatalyst with high activity. But the optimal doping conditions, including the variety and concentration of RE elements are ambiguous, and the contribution of doped RE ions to the enhancement of photocatalytic activity needs to be further studied. In this work, we doped La, Y and Sm with a wide range of 0%–30% into CeO2 NRs, and investigated the phase, morphology, band gap, oxygen vacancy concentration, PL spectra and photocatalytic activity variation under different doping conditions. All synthesized CeO2-RE NRs possessed a good nanorod morphology except the 15 and 30% Y-doped samples. The energy band gaps of the synthesized samples changed slightly; the 10% CeO2-RE NRs with the narrowest band gaps possessed the higher photocatalytic performance. The most outstanding photocatalyst was found to be the 10% Y-doped CeO2 NRs with a methylene blue photodegradation ratio of 85.59% and rate constant of 0.0134 min−1, which is particularly associated with a significant higher oxygen vacancy concentration and obviously lower recombination rate of photogenerated e−/h+ pairs. The doped RE ions and the promotion of oxygen vacancy generation impede the recombination of photogenerated carriers, which is proposed as the main reason to enhance the photocatalytic property of CeO2.
研究领域:
材料科学
·
环境科学
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 5
·2134-2142
·
IF 3.784
Yafei Liu,Zhilong Fu,Xingyu Chen,Yaxin Wei,Bo Zhang,Aimin Chang
Rare-earth ions doped Ca 0.9 R 0.1 CeNbMoO 8 ( R = Y, Sm, Nd, La) ceramics have been successfully prepared by solid-state method, and their modifications to the microstructure and electrical properties are also investigated. The rare-earth ions doped ceramics exhibit the scheelite structure. With the increase in the radius of rare-earth ions, the lattice distortion and bond interaction will be enhanced, and the consistency of grain size will be reduced. The ceramics exhibit negative temperature coefficient (NTC) thermistor characteristics in the temperature range of 473 K-1273 K, and the activation energy decreases with the increase of the radius of rare-earth ions. Rare-earth ions doping can increase the content of Ce 3+ ions and promote the conductivity of ceramics. Except for Sm 3+ -doped ceramics, the high-temperature aging rate of other ceramics is less than 2%. The existence of some metastable Sm 2+ ions in Sm 3+ -doped ceramics not only increases the activation energy, but also reduces the high-temperature stability of the ceramics.
研究领域:
材料科学
·
固态物理
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高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Na Tong,Ying Wang,Yang Liu,Minbo Li,Zizhong Zhang,Huijuan Huang,Tao Sun,Jinxiang Yang,Fuying Li,Xuxu Wang
Photocatalytic ammonia synthesis is of great importance but remains very challenging in photocatalysis. Here, we fabricated a photocatalytic reaction system for the efficiently photocatalytic nitrate reduction to ammonia under UV irradiation using PdSn/NiO/NaTaO 3 :La as a photocatalyst in the presence of formic acid. Several important factors of the photocatalytic performance were investigated, including initial concentration of the nitrate solution, initial pH value and cocatalyst loadings. Nitrate conversion reaches 100% and ammonia selectivity is 72% over the optimum photocatalyst with 5% bimetallic PdSn alloy and 0.2% NiO loadings. The outstanding performance of photocatalyst can be ascribed to both the strong adsorption of nitrite on NiO and the efficient separation of electron-hole pairs by PdSn bimetallic alloy. Besides as the hole scavenger, formic acid also provides not only carboxyl anion radicals for nitrate reduction but also the in-situ buffer effect on ammonia formation. These results give inspiration for designing the reactive system with efficient photocatalytic ammonia synthesis.
研究领域:
材料科学
·
环境科学
·
化学工程
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 10
·3351-3358
·
IF 7.059
Shoulong Chen,Tianju Zhang,Xiaolin Liu,Jinli Qiao,Lin Peng,Jun Wang,Yongsheng Liu,Tieying Yang,Jia Lin
Inorganic CsPbI2Br halide perovskite has received extensive attention due to its excellent thermal stability and suitable bandgap for high-performance solar cells. However, CsPbI2Br can easily transform from the perovskite phase to the non-perovskite phase due to a water vapour-induced phase transition under ambient conditions, leading to a rapid degradation of device performance. Herein, we introduced lanthanum (La3+) ions into the lattice to stabilize the perovskite phase in CsPbI2Br-based all-inorganic solar cells. A power conversion efficiency of 8.03% was obtained at an optimized La3+-doping level of 2%, leading to a 27% efficiency improvement. Moreover, the La3+-doped solar cell retained 90% of its efficiency in ambient air for 400 h, showing a significantly enhanced moisture stability compared to that of the pristine (undoped) device. Detailed analysis indicates that La3+-ions can induce lattice shrinking and thus inhibit the formation of a non-perovskite phase, and enhance the charge carrier lifetime, which contribute to the improved moisture stability and efficiency. Our results indicate that highly stable all-inorganic solar cells can be produced in an air atmosphere, showing great potential for future commercialization.
研究领域:
材料科学
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太阳能电池
·
光电转换
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高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 5
·742-753
·
IF 11.534
Guo Meng,Liu Yufeng,Zhang Fengnian,Cheng Fuhao,Cheng Chufei,Miao Yang,Gao Feng,Yu Jun
A series of high-entropy perovskite oxides (HEPOs) La(CoCrFeMnNiAl x ) 1/(5+ x ) O 3− δ ( x = 0.4, 0.5, 0.6, and 0.7) have been synthesized by coprecipitation method combined with calcination process and explored as electrodes for supercapacitors. The crystal structure, microstructure, and elemental composition of HEPOs were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDS) in detail. The electrochemical properties of HEPOs as supercapacitor electrodes were elucidated. The specific capacitances of HEPOs ( x = 0.4, 0.5, 0.6, and 0.7) are 281.84, 353.65, 325.60, and 259.30 F/g at the current density of 1 A/g, respectively. After 2000 cycles, the specific capacitances of HEPOs ( x = 0.4, 0.5, 0.6, and 0.7) remain 85.01%, 88.61%, 86.37%, and 91.25%, respectively. Such outstanding electrochemical properties can be attributed to the entropy-stabilized structure caused by mixed six cations in B-site and the Al 3+ -doping suppressing active ion aggregation during charge—discharge process. This research highlights the potential of HEPOs as electrodes for supercapacitors.
研究领域:
材料科学
·
电化学
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高影响因子
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