查找使用阿拉丁产品的科研文献

Effectively enhanced hydrogen storage properties of Mg90Al10 catalyzed by CeF3

Mengran Li,Qinke Tang,Lili Yang,Rui Shi,Shihao Chen,Yingzhen Zhu,Yunfeng Zhu,Yao Zhang,Jiguang Zhang,Yana Liu,Jun Wang,Zhixin Ba

Magnesium-based hydrogen storage alloy serves as an ideal substance for hydrogen storage and transportation because of its high hydrogen storage capacity, low expense, and eco-friendly properties. However, the stable thermodynamic properties and poor kinetic properties during de/hydrogenation limit its application. In this work, a novel high-efficiency catalyst CeF 3 was successfully synthesized and induced into Mg 90 Al 10 , which exhibited excellent performance during de/hydrogenation. In particular, the Mg 90 Al 10  + 8 wt% CeF 3 can absorb 4.0 wt% hydrogen within 600 s at 200 °C, and release 4.3 wt% hydrogen within 900 s at 275 °C, better than the Mg 90 Al 10 that can only absorb 1.36 wt% and release 0.3 wt% hydrogen in similar conditions. Meanwhile, the introduction of CeF 3 can also decrease the dehydrogenation apparent activation energy (E a ) of Mg 90 Al 10 obviously from 155.95 kJ/mol to 79.31 kJ/mol. The Al 4 Ce and MgF 2 formed in situ, combined with the high thermal conductivity of Al in charge of the good hydrogen storage behavior of Mg 90 Al 10  + 8 wt% CeF 3 . The study results are of great importance for applying Mg-Al hydrides in solid-state hydrogen storage.

Effects of LaF3/CeF3 on the friction transfer of PTFE-based composites

Ting Xie,Yaru Shi

The friction transfer of polytetrafluoroethylene (PTFE) composites is closely related to their tribological performances . To clarify the effects of LaF 3 /CeF 3 on the friction transfer of PTFE-based composites, the transfer film thickness and coverage were investigated under different loads or speeds. The results show that the addition of LaF 3 /CeF 3 can decrease the transfer film thickness and increase the transfer film coverage to form a thin and uniform transfer film, and the co-filling of LaF 3 and CeF 3 is better in promoting friction transfer of PTFE-based composites than single addition of LaF 3 or CeF 3 . The correlation between transfer film and tribological properties was also analyzed, which indicates that the friction transfer is beneficial for improving the tribological properties of PTFE composites.

Study on reversible hydrogen sorption behaviors of 3LiBH4/graphene and 3LiBH4/graphene–10 wt% CeF3 composites

Yingying Zhu,Jianxin Zou,Xiaoqin Zeng

In the present work, two LiBH4 based hydrogen storage composites, namely, 3LiBH4/graphene and 3LiBH4/graphene–10 wt% CeF3, were prepared through ball milling and their hydrogen sorption behaviors were investigated. It was shown that the dehydrogenation kinetics of 3LiBH4/graphene was improved by doping 10 wt% CeF3, which was attributed to the formation of CeB6. The rehydrogenation of the 3LiBH4/graphene composite could be achieved under 440 °C with 3.3 MPa hydrogen pressure and the hydrogen absorption capacity reached 7.40 wt% to LiBH4 after 10 h. Further addition of CeF3 did not improve the rehydrogenation kinetics but reduced the absorption capacity. SEM observations suggested that LiBH4 was confined in a graphene wrapper after rehydrogenation, forming “graphene capsules” that helped the regeneration of LiBH4.

Facile synthesis of rare earth-doped CeF3 two-dimensional nanosheets and their application in ratiometric luminescence temperature sensing

Ran An,Yuan Liang,Pengye Du,Pengpeng Lei,Hongjie Zhang

Discovery of new morphological and structural materials is significant but remains challenging. In this work, rare earth-doped CeF3 two-dimensional (2D) nanosheets were successfully synthesized using a facile and effective solvothermal method. By changing the amount of water in the solvent and the doping amount of rare earth ions, the morphology of CeF3 is significantly affected, but the hexagonal phase structure is always maintained. Under excitation at 254 nm, CeF3:20% Gd, 30% Tb 2D nanosheets emit bright green light, but the luminescence color changes to red when some of the Tb3+ ions are replaced by Eu3+ ions due to the efficient energy transfer from Tb3+ to Eu3+ ions. Moreover, the temperature-dependent luminescence properties of CeF3:20% Gd, 25% Tb, 5% Eu prove that it can be used as a ratiometric luminescent thermometer with an absolute sensitivity of 1.54% K−1 and a maximum relative sensitivity of 4.56% K−1 at 373 K. This study enriches the treasure trove of new materials and paves the way for future applications of CeF3-based luminescent materials in the field of temperature sensing.

Thermo- and pH-Responsive CeF3 Nanocrystals/HPC–PAA Complex Nanogel and Its Drug Release Behavior

Ben Liu,Qiusheng Song,Qiancheng Zhang,Haihong Ma,Ziwen Zhang,Dapeng Wang

In this study, a kind of novel rare-earth nanocrystals/hydroxypropylcellulose–poly (acrylic acid) (HPC–PAA) complex fluorescent nanogel, its responsive behavior to environmental temperature and pH value were reported. For preparation, with HPC being used as template, HPC–PAA nanogel was first synthesized by polymerization and crosslinking reaction of acrylic acid (AA) in water solution. In the process, a redox initiator, which composed of ammonium persulfate (APS) and N,N,N′,N′-tetramethylethylenediamine (TEMED), was used to initiate the reaction. Then, the as-prepared nanogel reacted with Ce(NO 3 ) 3 ${}_3{)}_3$ and NH 4 F solution successively, and a novel CeF 3 nanocrystals/HPC–PAA complex nanogel was fabricated. The microstructure of the nanogel was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), Thermogravimetric (TG) and Transmission electron microscopy (TEM). The environmental sensitivity of the nanogel was investigated by photoluminescence (PL) and UV–Visible spectrophotometer (UV–Vis). The thermo- and pH-sensitive fluorescence were studied by PL at various temperatures and pH values; besides, the behavior of drug loading and release was researched by PL with a famous antibiotic of Ibuprofen as model drug. The results show that the PL intensity of the nanogel was largely affected by environmental temperature, or content of Ibuprofen loaded in the nanogel. The as-prepared nanogel can be used as useful sensitive material to detect temperature and pH value change, and drug loading or release property of Ibuprofen can be detected by PL emission of the nanogels conveniently.

A Method for Modifying LSPR Biosensors with CeF3 and Gold Nanobipyramids to Optimize the Sensitivity and Detection Limit of Interleukin

Yizhuo Qian,Qi Wang

Surface plasmon resonance (SPR) technology is an advanced analytical method in the field of biological analytes detection. In order to break the limit of sensitivity and limit of detection (LOD) of optical fiber SPR sensor and enhance small change detection, a novel high-sensitivity optical fiber localized surface plasmon resonance (LSPR) sensor modified by Cerium Fluoride (CeF₃) and gold nanobipyramids (Au NBPs) is proposed in this work. The refractive index sensitivity of the sensor is as high as 9414.90 nm/RIU, which is 4.99 times that of the traditional SPR sensor. The CeF₃/Au NBPs sensor was applied to the detection of interleukin-1β (IL-1β) and interleukin-10 (IL-10). For IL-1β, the sensor's sensitivity and LOD are 11.16 nm/(μg/mL) and 0.90 ng/mL. Compared with the traditional sensor, the sensitivity is increased by 3.73 times, and the LOD is reduced to 28.48%. For IL-10, the sensitivity and LOD of the sensor are 10.90 nm/(μg/mL) and 0.92 ng/mL, respectively. Compared with traditional sensors, the sensitivity is increased by 4.29 times, and the LOD is reduced to 23.35%. The sensor modified by CeF₃ and Au NBPs shows excellent performance and broad development prospects in the field of low concentration biological analytes detection.

Interfacial Engineering of a MoO2–CeF3 Heterostructure as a High-Performance Hydrogen Evolution Reaction Catalyst in Both Alkaline and Acidic Solutions

Jian Chen,Xiaopeng Qi,Chao Liu,Jinming Zeng,Tongxiang Liang

Exploring an efficient and pollution-free hydrogen evolution reaction (HER) electrocatalyst based on the combination of rare-earth metal and nonnoble metal is of significant importance. However, successfully achieving such a goal remains highly challenging. Herein, a nanosheet comprising a MoO2–CeF3 heterojunction (MoO2–CeF3/NF) is successfully prepared via a three-step method. (1) Growth of hexahedral nickel hydroxide [Ni(OH)2] on a 3D nickel foam (NF) as the scaffold. (2) In situ hydrothermal growth of a precursor nanosheet structure on the scaffold. (3) Calcination treatment at 450 °C in the presence of hydrogen. Herein, the electron redistribution at the heterointerface of CeF3 and MoO2 is a contributing factor toward enhanced HER activity. Appropriate introduction of CeF3 can enlarge the size of nanosheets, increase numerous active sites, increase the catalytic durability of the material, and change electron distribution on the MoO2 interface; all of the above improve HER activity. Because of its interfacial nanosheet structure, MoO2–CeF3/NF demonstrates pre-eminent HER capability in both alkaline (1.0 M KOH) and acidic (0.5 M H2SO4) electrolytes, with extremely small overpotentials of 18 and 42 mV at 10 mA cm–2, respectively. This is obviously lower than the overpotential of Pt/C in alkaline media (27 mV), and it is also close to the overpotential of Pt/C in acidic media (41 mV), at the same current density. More importantly, MoO2–CeF3/NF displays a better HER activity than Pt/C at a current density of >112 mA cm–2 in both alkaline and acidic electrolytes. This work offers a novel strategy toward high-performance hydrogen production by designing a transition metal oxide and rare-earth metal heterojunction.

Anchoring CeF3 nanoparticles on porous carbon nanofibers as self-supporting electrodes for highly sensitive detection of nitrite

Gang Lang,Bo Feng,Xiaomei Chen,Zhiting Zhou,Zhicheng Zhao,Qin Deng,Zhenju Jiang,Jing Feng

Designing a working electrode is crucial for the reliable electrochemistry detection, which is applied to detect toxic and harmful substances sensitively and rapidly. Here we report the polytetrafluoroethylene decomposition-assisted electrospinning, a combination method for creating nanopore and synthesizing CeF 3 , to prepare the self-supporting electrode of CeF 3 nanoparticles-anchored on porous carbon nanofibers (CeF 3 /PCNFs) for highly sensitive nitrite detection. The CeF 3 /PCNFs exhibits remarkable electroactivity toward nitrite detection, featuring a wide concentration range (0.5 μM–6 mM), low detection limit (10 nm) and high sensitivity (2093 μA mM −1  cm −2 ). It also exhibits excellent selectivity , stability and reproducibility, and powerful reliability for nitrite detection in saliva, pickles, sausages, chips, river water and tap water. This study provides a facile strategy to prepare the metal fluoride-based self-supporting electrode, which overcomes the disadvantages of chemically modified electrodes unstable and poorly reproducible, and is significant for clinical diagnosis, food safety and environmental monitoring.

Novel CuO/CeF3/CeO2 porous nanosheet for high sensitivity isobutanol gas sensor

Jiahui Lin,Yue Wang,Leyao Bi,Jiaxing Fu,Junsheng Wen,Chunjie Wang

Despite being classified as a low-toxicity chemical, isobutanol poses non-negligible hazards to human health and the environment. This study reports, for the first time, the successful synthesis of porous CuO/CeF 3 /CeO 2 nanocomposites via a two-step hydrothermal method and demonstrates their application in isobutanol gas detection. The composition and morphological characteristics of the sensing material were determined through XRD, SEM, TEM, EDX, FT-IR, Raman, UV-vis, and XPS, and its gas-sensing properties were systematically investigated. The CuO/CeF 3 /CeO 2 -3 sensor exhibits a high response of 24.5 towards 100 ppm isobutanol at 180 °C, which is nearly eight times that of pristine CuO (3.1). Additionally, it demonstrates rapid response and recovery time of 13 s and 9 s, respectively, and still achieves a considerable response of 3.6 even at a low concentration of 5 ppm. Furthermore, the short-term repeatability, gas selectivity, response under various relative humidity levels, and long-term stability (over 28 days) of the sensor were evaluated. Finally, the mechanism behind the enhanced gas-sensing performance of the CuO/CeF 3 /CeO 2 sensor was thoroughly investigated, which is primarily attributed to four aspects: the synergistic modulation effect of the p-n heterojunction and the insulating layer, the formation of the porous structure, the significantly increased proportion of chemisorbed oxygen (O C ), and the dual catalytic effect exerted by both CeF 3 and CeO 2 .

Syntheses and multi-emissive properties of CeF3:Tb3+-doped phosphotungstate solid nanospheres

Ningning Guo,Ning Liu,Ruru Meng,Tingting Song,Yaohua Lu,Guan Wang

Coupled Synergistic Pathway of FeOOH/CeF3 Heterojunction Toward High-Current-Density and Durable Oxygen Evolution Reaction

Ziyi Gao,Yonghu Ma,Fu Ma,Guolin Feng,Xiaoyan Zhong,Hui Su,Hongjian Zhao

Designing effective and durable electrocatalysts for the oxygen evolution reaction (OER) that can operate sustainably under high current densities remains a critical challenge. A significant obstacle lies in overcoming the inherent trade-off between activity and stability, primarily caused by the linear scaling relationships of adsorbates in multi-step reactions and the formation of oxygen vacancies associated with lattice oxygen participation. Herein, we report a FeOOH/CeF 3 heterojunction catalyst on nickel foam that leverages reversible Ce 3+ /Ce 4+ redox couples and highly electronegative fluorine to accelerate electron transfer across the interface, resulting in a high d-band electron occupancy at Fe sites. At the atomic scale, this heterointerface enhances Fe–O bond covalency and lattice stability, moderately activating lattice oxygen while suppressing Fe peroxidation and dissolution. In situ studies confirm that the catalyst synergizes the adsorbate evolution mechanism with the lattice oxygen mechanism, disturbing the conventional activity-stability trade-off. The optimized electrocatalyst achieves low overpotentials of 194 and 224 mV at 10 and 100 mA cm −2 , respectively, and sustains over 200 h of operation at 500 mA cm −2 . This study offers an efficient heterostructure design strategy for high-performance OER via dual-mechanism coupling.