Catalysts
·
2026
·Vol. 16
·期 10
·919
·
IF 4.5
Guanghua Chen,Ning Cao,Zhonghao Deng,Xiangqing Zhang,Xiao Wang,Chong Peng,Liling Fang,Xusheng Ao,Shaobin Tan,Weibin Qiu
Nitrate, as a core component of water pollution, poses a severe threat to the ecological environment and human health. Electrochemical ammonia synthesis via nitrate reduction (NO3RR) is a highly promising sustainable technology, yet the simultaneous achievement of high activity and high selectivity remains a critical challenge in this field. Conventional Cu-based catalysts suffer from insufficient intrinsic activity and sluggish reaction kinetics. Moreover, the Cuδ+active sites are prone to valence evolution and structural reconstruction during electrocatalysis, making it difficult to meet the demands of long-term industrial-scale operation. To break through the aforementioned bottlenecks, this study proposes a rare-earth-regulated electronic structure engineering strategy. By constructing a Cu 3d–O 2p–La 4f gradient orbital coupling system, the surface chemisorption behavior of transition metals is precisely optimized, and the electron transfer pathway is efficiently modulated. The introduction of La not only strengthens electron delocalization and transport through the gradient orbital channel to enhance the adsorption and activation capability of NO3−, but also stabilizes the Cuδ+active sites via its unique 4f electronic structure, optimizes the adsorption energy of key intermediates, and synergistically boosts the catalytic performance. Experimental results demonstrate that the optimized La0.02-CuOxelectrode exhibits no obvious performance degradation after continuous operation for 30 h at a large current density of 2.5 A cm−2, delivering an ammonia yield of 186.99 mg·h−1·cm−2and a Faradaic efficiency of 94.39%. This rare-earth orbital coupling strategy provides a new research insight for the rational design of highly stable Cu-based NO3RR catalysts.
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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.
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Materials
·
2026
·Vol. 19
·期 12
·2556
·
IF 3.7
Xue Yang,Shirong Yang,Dongbao Song,Hongtao Zhang,Junfeng Li,Pu Wang
HighlightsS, N co-regulated La2O2S/g-C3N4-derived carbon electrodes were successfully fabricated via thiourea-assisted carbonization of La-BDC-140.La-CNS3achieved a high fluoride removal capacity of 195 mg·g−1at an initial fluoride concentration of 100 mg·L−1.Reverse-voltage regeneration enabled reversible fluoride (F−) electrosorption without chemicals.What are the main findings?Under electric-field stimulation, the electrode exhibited excellent reversible adsorption/desorption, with a regeneration efficiency of F−exceeding 70%.Mechanistic analyses revealed that fluoride removal is mainly governed by La-F coordination, surface hydroxyl/water ligand exchange, and interfacial charge redistribution.DFT calculations further confirmed that the La2O2S/g-C3N4structure provides a favorable balance between fluoride adsorption strength and desorption reversibility.What are the implications of the main findings?These findings demonstrate that S, N co-regulation is an effective strategy to address the regeneration limitations of conventional La-based defluoridation materials.The La2O2S/g-C3N4-derived carbon electrode enables high-capacity, selective, and electrically regenerable fluoride removal in capacitive deionization (CDI) systems.This work provides a theoretical basis for designing sustainable rare-earth-based electrodes with balanced fluoride adsorption strength and desorption reversibility.La-MOFs exhibit strong affinity toward anions such as F−and phosphate. However, conventional La-MOFs show limited regeneration performance when used as CDI electrodes, posing a major challenge for practical applications. In this study, a high-performance sulfur and nitrogen co-doped La-BDC-140-derived carbon electrode (La-CNS3) was fabricated via a coupled carbonization and doping strategy. The optimized La-CNS3electrode possessed abundant defects, a mesoporous structure, favorable hydrophilicity, and rapid charge-transfer capability, which collectively enhanced fluoride electrosorption. At 1.4 V, La-CNS3achieved a fluoride removal capacity of 31.86 mg·g−1for 10 mg·L−1F−solution and up to 195 mg·g−1at an initial F−concentration of 100 mg·L−1. More importantly, partial fluoride desorption was realized solely under reverse voltage, and the electrode maintained favorable defluoridation performance over 50 adsorption–desorption cycles. In actual groundwater treatment, the effluent fluoride concentration decreased to below 1.0 mg·L−1after 120 min. XPS analysis and DFT calculations revealed that fluoride removal was mainly governed by La-F coordination, surface hydroxyl/water ligand exchange, and interfacial charge redistribution. The La2O2S/g-C3N4structure provided a favorable balance between fluoride adsorption strength and desorption reversibility. This work offers a promising strategy for designing efficient, selective, and electrically regenerable rare-earth-based CDI electrodes for fluoride-contaminated water treatment.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2026
·
IF 8.2
Xiaoli Guo,Zhuguang Nie,Xiaonan Yang,Jinqiu Chen,Jiahui Chen,Rumin Wang,Shuhua Qi
Electromagnetic wave (EMW) absorbing materials play a vital role in mitigating electromagnetic pollution and advancing stealth and protection technologies. In this study, flake-like transition metal molybdates (RMoO 4 , R=Ni, Co) were loaded onto a three-dimensional N-doped hollow carbon foam (NCF) to construct electromagnetic wave absorbing (EMA) composite materials. Combining density functional theory (DFT) calculations with CST simulations shows that La doping can enriches Ni 3+ /Co 3+ and create charge inhomogeneity with local dipoles, thereby enhancing dielectric loss. It also reduces the density of states near the Fermi level, suppresses continuous conductive pathways, and improves impedance matching. At a low filler loading (4 wt%), La-doped CoMoO 4 /NCF (LCM/NCF), exhibited extremely low reflection loss (−52.40 dB) and broad effective absorption bandwidth (6.08 GHz). Notably, under near infrared irradiation, the surface temperature of the composite can rapidly rise to above 125 °C within 24 s. In simulated seawater, LCM/NCF exhibits outstanding corrosion resistance. This work provides an innovative strategy for designing lightweight, high-efficiency electromagnetic wave absorbers.
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Surfaces and Interfaces
·
2026
·
IF 6
Hui Zhou,Bingxin Zhu,Xiang Li,Baolei Liu,Zhigang Liu,Shihua Yu
To recover the high value-added pharmaceutical intermediate tenofovir from wastewater efficiently and conveniently, a tailored magnetic composites of Fe 3 O 4 @SiO 2 @La(OH) 3 have been prepared via solvothermal and in-situ reduction methods. It exhibits the ability to remove tenofovir with high efficiency and easily separated from matrix. Batch sorption experiments demonstrated that Fe 3 O 4 @SiO 2 @La(OH) 3 can remove tenofovir with the maximum adsorption capacity of 64.53 mg/g, the largest removal of 93.07%, and fast equilibrium time of 5 min. The kinetics of tenofovir adsorption on the magnetic composite is in line with the pseudo-second-order model, while the isotherm is fitted well by the Langmuir model, and thermodynamic parameters represent that adsorption process is spontaneous and endothermic. Moreover, the saturated Fe 3 O 4 @SiO 2 @La(OH) 3 have been desorbed by mechanical stirring with the high desorption rate of 93.02%, and the adsorption capacity maintaining 47.72 mg/g after five cycles. Importantly, the composites can be used for tenofovir removal from crude extracts of pharmaceutical wastewater, with an adsorption capacity of 51.61mg/g in 5 min. Finally, the adsorption mechanisms are explored by pH experimental evidence and XPS analysis, which show that mainly involve electrostatic attraction and the inner-sphere complexation between La(OH) 3 and phosphate groups of tenofovir via ligand exchange. All the results prove that the proposed tenofovir recovery technique, providing new ideas for the recovery of high value-added substances and waste resources rationalization of the application of development. A magnetic Fe 3 O 4 @SiO 2 @La(OH) 3 was synthesized and realized the recovery of tenofovir with high economic value in pharmaceutical wastewater crude extracts. Download: Download high-res image (249KB) Download: Download full-size image
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Xuewei Ba,Xinyu Han,Wenping Huang,Yuhong Ge,Qiran Wen,Yan Yu,Deqing Zhang,Li Li
Sr 2 (Y, La)NbO 6 :Dy blue-white phosphors were prepared by high-temperature solid-state method. The effects of substitution on the crystal structure, photoluminescence properties, and thermal stability were investigated by XRD, SEM, EDS, XPS, diffuse reflectance spectroscopy, and photoluminescence spectroscopy. Phase analysis indicates that the crystal structure of the host materials is not altered by the introduction of Dy 3+ ion, but transfers from monoclinic to cubic system by substituting Y 3+ ions with La 3+ ions. Morphological analysis reveals that the phosphors exhibit irregular shapes with the particle diameters ranging from 10 μm to 20 μm. The blue shift appears in the charge transfer band with the increase of La 3+ ion dosage. Sr 2 (Y, La)NbO 6 :Dy phosphors can be excited by near-ultraviolet and blue light. The emission spectra exhibit two characteristic peaks at 488 nm and 580 nm, corresponding to the 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 optical transitions of Dy 3+ ions, respectively. The emission intensity and the fluorescence lifetime are enhanced by the replacement of Y 3+ ions with La 3+ ions. The Sr 2 LaNbO 6 :Dy phosphor possesses excellent thermal stability. The luminescent intensity at 423 K retains 83% of the value at room temperature. The result indicates that Sr 2 (Y, La)NbO 6 :Dy phosphors have good prospects in solid state lighting.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2015
·
IF 2.133
Xinshan Rong,Fengxian Qiu,Jian Rong,Jie Yan,Hao Zhao,Xiaolu Zhu,Dongya Yang
A series of porous g-C 3 N 4 /La (PGCN/La) materials used as photocatalyst for the degradation of phenol were prepared by two steps. The photocatalysts were characterized by X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (DRS), thermogravimetry (TG), Brunauer–Emmett–Teller (BET), Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). From the TEM morphology, the porous structure of g-C 3 N 4 could be successfully controlled; from BET results, BET specific surface area of porous g-C 3 N 4 (PGCN) sample increases with the increasing of urea mass ratio. Compared with PGCN material (PGCN-50), PGCN/La sample (PGCN-50/La-5) could exhibit an enhanced photocatalytic activity and has the best degradation efficiency of 98.6% within 50 min under visible light irradiation. Photocatalytic reaction follows the first-order model kinetics ; and PGCN-50/La-5 photocatalyst shows the largest reaction rate among all samples which is nearly 2.96 times higher than that of pure PGCN-50. The present work illustrates that the photocatalytic activity of porous g-C 3 N 4 was improved by the addition of La and PGCN-50/La-5 has potential application in the removal of phenol or other organic molecular from wastewater.
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BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Dawei Fan,Xiang Ren,Haoyuan Wang,Dan Wu,Di Zhao,Yucheng Chen,Qin Wei,Bin Du
A novel and sensitive sandwich-type photoelectrochemical (PEC) sensor was fabricated using signal amplification strategy for the quantitative detection of the prostate specific antigen (PSA). CdSe nanoparticles (NPs) sensitized lanthanum-doped titanium dioxide (La-TiO 2 ) composites were used to bind the primary antibodies (Ab 1 ). The doping of lanthanum promoted the visible light absorption of TiO 2 and remarkably enhanced the photocurrent . Moreover, 0.3%La-TiO 2 displayed the highest photocurrent in the La-TiO 2 composites, which was twice as much as that of undoped TiO 2 . Carboxyl modified CdSe NPs were assembled onto La-TiO 2 composites via the dentate binding between –COOH and Ti atom in TiO 2 NPs, which dramatically promoted the photocurrent intensity by approximately 2.1 times. Carboxyl functionalized polystyrene (PS) microspheres were coated with the secondary antibodies (Ab 2 ). Owing to the better insulation property and steric hindrance of the prepared polystyrene@Ab 2 (PS@Ab 2 ) composites, the significant reduction of the photocurrent signal was achieved after the specific immune recognition. Under the optimum experimental conditions, the fabricated PEC sensor realized ultrasensitive detection of PSA in the range of 0.05–100 pg mL −1 with a detection limit of 17 fg mL −1 . Moreover, this well-designed PEC immunoassay exhibited ideal reproducibility, stability, and selectivity, which is a promising platform for the detection of other important tumor targets.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 8.3
Jing Pan,Yongde Yan,Yanghai Zheng,Shengrong Guo,Xuepeng Wang,Sihao Wang,Zhiguang Du,Kaijie Wang,Yun Xue,Kai Zhu
A method for the preparation of LaNi 5 alloy by molten salt co-reduction is reported. The electrochemical co-reduction process of La(III) and Ni(II) as well as the reaction process of intermetallic compounds formation were investigated. It was confirmed that the diffusion coefficient of La(III) in LiF–CaF 2 molten salt is 4.684–8.098 × 10 −5 cm 2 s −1 at temperatures of 1113–1183 K. And the reaction activation energy was obtained to be 78.86 kJ mol −1 . And, the exchange current densities of La(III)/La(0) were determined by the Tafel (0.149–0.251 A cm −2 ) and linear polarization (0.143–0.204 A cm −2 ) methods. Furthermore, five different La–Ni intermetallic compounds were detected by studying the co-reduction reaction of La(III) and Ni(II) ions. Meanwhile, the formation potentials of La–Ni intermetallic compounds were defined by various electrochemical tests. In addition, the LaNi 5 alloy was obtained via potentiostatic electrolysis according to the electrochemical results. This study provides new insights into the electrochemistry of the LiF–CaF 2 –LaF 3 –NiF 2 molten salt and enhances the understanding of the molten salt electrolytic preparation of La–Ni alloys from co-reduction.
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INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Ruopeng Zhao,Zhangyong Wu,Dong Chen,Yineng Shen,Xuhui Qin,Meiyan Zhao,Lu Yan,Yong Liu
Rare-earth materials are commonly described as “industrial vitamins” since they are mainly employed as structural or electronic modifiers rather than as direct catalytic centers. This is because their highly shielded 4f electrons prevent them from effectively participating in interfacial charge transfer. In this work, we break this long-standing limitation by engineering atomically dispersed lanthanum (La) on nitrogen-doped carbon (NC), where it is stabilized in a La-N4 coordination environment to form a new material denoted as La-NC. The resulting La-NC electrode functions as a highly active single-atom electrochemical sensing platform, enabling the selective and simultaneous detection of ascorbic acid, dopamine, and uric acid in tear fluid. Synchrotron X-ray absorption spectroscopy and aberration-corrected electron microscopy confirm the formation of isolated La single atoms with a well-defined La-N4 configuration. Density functional theory calculations reveal that the La-N4 sites circumvent 4f-electron shielding by promoting molecular adsorption. This facilitates interfacial charge transfer, thereby accounting for the observed electrochemical activity and molecular discrimination. This work identifies rare-earth single-atom sites as intrinsically active electrochemical centers, making them beneficial for use as biosensors in multicomponent environments such as tear fluid.
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ACS Sustainable Chemistry & Engineering
·
2026
·Vol. 14
·期 35
·15530-15540
·
IF 7.6
Liu Jinpeng,Deng Runze,Mai Songlang,Zou Yuanhua,Marwat Mohsin Ali,Wang Junya,Tran Nguyen-Minh-An,Zhu Hanfei,Zhang Haibo,Tan Hua
Dielectric thin film capacitors are characterized by high energy density, rapid charge-discharge, high usable efficiency, and high breakdown field strength, and are widely used in electronics and novel energy technologies. To address the trade-off among polarization, efficiency, and breakdown strength in traditional single-layer dielectric capacitors, this study employs a low-cost sol-gel method to synthesize a BTO/PLCT/BTO sandwich structure film. By optimizing the annealing process, an amorphous/ferroelectric/amorphous multilayer phase structure coexistence was achieved. With increasing annealing temperature, the polarized nanoregions within the amorphous BTO layer expand, while the PLCT layer crystallizes into a ferroelectric phase. At 600 ° C, the synergistic amorphous/ferroelectric/amorphous phase effect is optimized, yielding an energy storage density of 80 J/cm 3 and an efficiency of 86% under an electric field of 5.4 MV/cm. Meanwhile, from room temperature to 150 ° C, the film achieves excellent dielectric and energy storage stability over a wide temperature range (variation rates of dielectric property and energy storage performance below 5%). After 10 9 fatigue cycles, the film still maintains the stability of its electrical performance (variation rate of Δ W rec /Δ W rec-initial ≤ 4%). This amorphous/ferroelectric/amorphous composite film overcomes the trade-off among polarization, usable efficiency, and breakdown strength inherent in single-phase materials, providing a viable strategy for fabricating high-stability energy storage films.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Yicong Wang,Sisuo Zhang,Richard L. Smith,Xiaoning Liu,Xinhua Qi
Effective removal of both nitrogen and phosphorus from water is of great importance for maintaining the safety of the environment. In this work, ordered mesoporous carbon electrode materials containing La(OH) 3 and Fe 3 C components (La#OMC-Fe 3 C) were prepared by combining solvent evaporation induced self-assembly and impregnation methods. The ordered pores in La#OMC-Fe 3 C facilitated electron transfer at the electrode-solution interface during nitrate reduction and provided voids for phosphate removal . In the electrochemical system, Fe 3 C in the electrode supplied electrons for nitrate reduction and gave the electrode a high degree of stability, whereas La(OH) 3 selectively removed phosphate, thus avoiding byproduct precipitation from solution. The electrode material maintained efficient electrochemical nitrogen and phosphorus removal over a wide range of conditions including pH (3–11) and aqueous environments containing multiple ions (Cl − , SO 4 2− , K + , Na + , Ca 2+ , Mg 2+ ) or actual aqueous environments (seawater). After 10 cycles, the performance of La#OMC-Fe 3 C for nitrogen and phosphorus removal remained above 97%. This work realizes the simultaneous removal of nitrogen and phosphorus in the electrochemical system, and solves the problems of precipitation in water and non-circulation of electrodes, which can provide a new strategy for the treatment of eutrophic water in practical production.
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