CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhenyu Xu,Han Liu,Weiping Zhou,Wanchun Yu,Guoqiang Xiao,Di Lu,Fei Gao,Zhenzhi Cheng,Guangsheng Luo
In this study, the impact of Gd 3+ doping on the structural, magnetic and dielectric properties of BaSrCo 2 (Fe 1- x Gd x ) 11 AlO 22 ( x = 0, 0.02, 0.04, 0.06, 0.08, 0.1) ferrite ceramics synthesized by the conventional solid-state reaction method are investigated. XRD results reveal that all the samples crystallize in the R 3 ‾ m space group. With the increase of Gd content, the formation of M-type phase is effectively inhibited due to Gd 3+ ions may change the activation energy of nucleation of the grains and the formation energy of hexaferrite. SEM analysis confirms the presence of hexagonal grains in samples with homogeneous elements distribution. The XPS results verify the coexistence of ferric and ferrous ions in the ceramics. The magnetization and coercivity are suppressed by Gd 3+ substitution. The permeability increases firstly and then decreases with the substitution of Gd ions. While the dielectric constant increases with the substitution of Gd. The real and imaginary parts of the dielectric constant in the frequency range of 2–18 GHz change slightly with doping amounts variation, and all the samples exhibit prominent peaks at about 14 GHz due to natural resonance.
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DOI
高影响因子
CORROSION SCIENCE
·
2024
·
IF 7.4
Keda Xiao,Yi Zeng,Xiang Xiong,Jinrun Hu,Shiyan Chen,Tianyou Li
Si-B-Mo-Y modified SiC/SiC composites were prepared by reactive melt infiltration (RMI) process to study their high-temperature water-oxygen corrosion resistance, and to compare them with SiC/SiC composites prepared by RMI using Si. The results show that the corrosion rates of the modified composites are only 1/9, 1/10 and 1/3 of those of the comparison samples at 1200°C, 1300°C and 1400°C, respectively, which is attributed to the higher densification of the modified composites. More importantly, the modified composites were able to form borosilicates, which effectively healed the oxide film defects; meanwhile, yttrium silicate inhibited the reaction between borosilicates and water vapor.
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DOI
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Catalysts
·
2024
·Vol. 14
·期 5
·324
·
IF 3.8
Jing Wang,Lingling Feng,Zikang Zhao,Yan Wang,Ying Zhang,Shan Song,Shengwei Sun,Junshuang Zhou,Faming Gao
Given the energy crisis and escalating environmental pollution, the imperative for developing clean new energy is evident. Hydrogen has garnered significant attention owing to its clean properties, high energy density, and ease of storage and transportation. This study synthesized four types of catalysts—FeS(DI/MB), FeS(ET/MB), Fe(DI/MB), and Fe(ET/MB)—using two distinct solution systems: DI/MB and ET/MB. The FeS(DI/MB) catalyst, synthesized using the layered solution system (DI/MB), demonstrates a uniformly distributed and dense nanosheet structure, exhibiting excellent resistance to strong bases and superior catalytic properties. The FeS(DI/MB) electrode showed OER overpotentials of 460 mV and 318 mV in 1 M and 6 M, respectively, at current densities of up to 500 mA cm−2. Under industrial electrolysis test conditions, the FeS(DI/MB) electrode required only 262 mV to achieve a current density of 500 mA cm−2, operating in a high-temperature, strong alkaline environment of 6 M at 60 °C. Furthermore, the FeS(DI/MB) electrode exhibited excellent OER catalytic activity and stability, as evidenced by a 60 h stability test These findings provide valuable insights into the preparation of iron nickel sulfide-based catalysts, and further in-depth and comprehensive exploration is anticipated to yield the excellent catalytic performance of these catalysts in the realm of electrolytic water hydrogen production.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Runzi Zhang,Shunbi Xie,Xiang He,Ying Gao,Mengjun Wang,Minghang Jiang,Xiaojun Luo,Yi He
Chloramphenicol (CAP), as a broad-spectrum antibiotic, is genotoxic to humans. In this paper, a “Y-shaped” SERS biosensor based on magnetic plasmonic superstructures Fe3O4@SiO2@Ag flowers and the highly efficient isothermal amplification strategy of exponential amplification reaction (EXPAR) technology was proposed for ultrasensitive detection of CAP in milk. This was achieved by forming a stable “Y-shaped” structure on the abundant sharp tips of Fe3O4@SiO2@Ag flowers through specific three-part assembly (Probe 1 connected to the magnetic substrate, Signal Probe 2 Au@4-NTP, and the EXPAR amplification product Amplicon). When the CAP was present, the Amplicon obtained from EXPAR amplification could form a “Y-shaped” structure with the magnetic material and the signal probe. Benefiting from the abundant branching, extensive surface area, and rough surface of the magnetic Fe3O4@SiO2@Ag flower, it offers a multitude of “hot spots” for plasmonic coupling in the electromagnetic field gap region and significantly reduces the nanogap between the signal probe and the silver nanoflowers by constructing a “Y”-shaped structure, thereby maximizing the amplification of the Raman signal. Enabling the detection range of CAP to be between 10–6 and 10–13 M with a detection limit of 17.9 fM. This strategy provided an avenue for trace detection of CAP in food.
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高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Shuhong Yi,Chenlong Gao,Qingfeng Fu,Shiru Wu,Jian-Fang Wu,Yan Duan,Menghao Yang,Jilei Liu
Solid-state potassium-ion batteries are promising options for large-scale energy storage due to their high safety and abundance of potassium resources. However, solid-state potassium-ion batteries are still in their infancy and the reported electrolyte materials are very limited, making the exploration of solid electrolytes with high ionic conductivity and physical/electrochemical stability a major challenge. Here novel triclinic K 3 LnSi 3 O 9 (Ln = Y and Gd) potassium-ion solid electrolyte is reported with low activation energy and high stability. A rational vacancy design strategy is adopted to synthesize K 3−x GdP x Si 3−x O 9 and the result of DFT calculation shows that the diffusion pathways of potassium ions on the ac plane exhibit a fish scale-like network structure. Specifically, the K 2.8 GdP 0.2 Si 2.8 O 9 delivers a high ionic conductivity of 2.9 × 10 −5 S cm −1 at 25 °C, accompanied by a stable potassium stripping/plating (a long-life cycle over 2000 h). As a result, the assembled quasi-solid-state KC/K 2.8 GdP 0.2 Si 2.8 O 9 /PB cell achieves a remarkable cycling performance at a high current density of 1 C (500 cycles, 95.9% capacity retention). These results would no doubt boost research for high-safety and high-energy-density solid-state potassium-ion batteries.
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DOI
PubMed
高影响因子
Energy Storage Materials
·
2024
·
IF 18.9
Meng Wang,Xiaolang Liu,Wen Zhang,Hongwei Niu,Leimin Xu,Jiantao Han,Yuhao Lu
For the first time, this work investigates the synergetic impact of yttrium (Y) and aluminium (Al) co-doping on the electrochemical properties of 4.6 V LiCoO 2 (LCO) cathode for high energy density lithium-ion batteries. The optimized LCO demonstrates an impressive initial discharge capacity of 208.6 mAh g −1 in the voltage range of 3–4.6 V, along with superior structural stability , retaining over 86 % of its initial capacity even after 125 cycles at the current of 100 mA g −1 that is far higher than the capacity retention of 40 % for the pristine LCO under the same condition. Thanks to the synergistic effect , Al in Co layers enhances the bonds of Al/Co-O to stabilize oxygen in the LCO crystal structure while Y serves “pillar” in Li layers, migrated from the initial Co layers during cycling process, effectively curtail the formation and expansion of interlayer cracking, which contributes to the long-term cycle stability of LCO under high voltage. Most importantly, Al/Y co-doping is a facile process compatible with the existing industrial infrastructure for LCO mass production, and thus it can be scaled up readily for commercial applications. Al/Y co-doped LCO is assembled into commercial-level pouch cells with graphite anode, achieves an extremely high energy density of 750 Wh/L, and exhibits a superior cycling stability and obtains a capacity retention of 88.2 % at 25 °C after 800 cycles with the high cutoff voltage of 4.55 V.
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高影响因子
RSC Advances
·
2025
·Vol. 15
·期 26
·21156
·
IF 4.6
Shaojie Hong,Fanhua Yu,Bin Guo,Xiangqian Ren,Xingfu Zhou
In recent years, “green synthesis” technology has emerged at the research forefront of the chemical industry as an environmentally friendly approach. As a new and effective chemical synthesis method, organic electrochemical synthesis technology has attracted increasing attention. In this paper, the sol–gel method is used to fabricate a Y-doped Ti/TiO 2 electrode. By adding different concentrations of Y ions, the macropore morphology of the film becomes more obvious, and substrate cracks are improved to a certain extent. EIS tests show that a 0.006-Y electrode exhibits lower charge-transfer resistance. Furthermore, linear voltammetry (LSV) analysis showed that the hydrogen evolution potential of the Y-doped Ti/TiO 2 film electrode was improved. At the optimal Y/Ti molar ratio of 0.006, hydrogen evolution potential reached −1.22 V, showing a −0.19 V shift compared with the undoped electrode, and the hydrogen evolution side reaction was effectively inhibited. Cyclic voltammetry (CV) tests show that the reduction peak current density in maleic acid solution is as high as 210 mA cm −2 , which is 1.7 times that of the undoped electrode, indicating that the addition of Y at trace concentrations improves the electrocatalytic reduction performance of the electrode. Considering that the cathode can reduce maleic acid at lower potential and has higher catalytic activity, cathode potential is controlled within the range of −0.6–1.2 V for the electrosynthesis of succinic acid. When the optimized reaction temperature is 50 °C, the electrosynthesis yield for succinic acid reaches 91%, and the current efficiency reaches 96.3%. Y-doped Ti/TiO 2 electrodes were prepared for succinic acid electrosynthesis. Y doping enhanced electrocatalytic reduction, achieving 91% yield and 96.3% current efficiency at 50 °C.
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 2
·705-713
·
IF 3.288
Samuthirarajan Senthilkumar,Wei Zhong,Mookan Natarajan,Chunxin Lu,Binyu Xu,Xiaoming Liu
An efficient and green protocol for aerobic oxidation of benzylic alcohols in ethanol using CuI–Y zeolite catalysts assisted by TEMPO (TEMPO = 2,2,6,6-tetramethyl-1-piperidine-N-oxyl) as the radical co-catalyst in the presence of atmospheric air under mild conditions is reported. The CuI–Y zeolite prepared via ion exchange between CuCl and HY zeolite was fully characterized by a variety of spectroscopic techniques including XRD, XPS, SEM, EDX and HRTEM. The incorporation of Cu(I) into the 3D-framework of the zeolite rendered the catalyst with good durability. The results of repetitive runs revealed that in the first three runs, there was hardly a decline in activity and a more substantial decrease in yield was observed afterwards, while the selectivity remained almost unchanged. The loss in activity was attributed to both the formation of CuO and the bleaching of copper into the liquid phase during the catalysis, of which the formation of CuO was believed to be the major contributor since the bleaching loss for each run was negligible (<2%). In this catalytic system, except TEMPO, no other additives were needed, either a base or a ligand, which was essential in some reported catalytic systems for the oxidation of alcohols. The aerobic oxidation proceeded under mild conditions (60 °C, and 18 hours) to quantitatively and selectively convert a wide range of benzylic alcohols to corresponding aldehydes, which shows great potential in developing green and environmentally benign catalysts for aerobic oxidation of alcohols. The system demonstrated excellent tolerance against electron-withdrawing groups on the phenyl ring of the alcohols and showed sensitivity to steric hindrance of the substrates, which is due to the confinement of the pores of the zeolite in which the oxidation occurred. Based on the mechanism reported in the literature for homogenous oxidation, a mechanism was analogously proposed for the aerobic oxidation of benzylic alcohols catalysed by this Cu(I)-containing zeolite catalyst.
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高影响因子
CARBON
·
2023
·
IF 10.9
Jie Li,Jie Sheng,Ziyue Yang,Zhaoyuan Liu,Yunzhong Wu,Changsheng Xing,Jiaxu Shuang,Bin Liu,Tong Zhang,Zhaoyu Chen,Lidong Wang,Weidong Fei
Graphene is the strongest material ever identified. However, the fabrication of graphene-based bulk materials from graphene powders presents a significant challenge. Here, a new strategy to fabricate high performance graphene based bulk materials by introducing silicon nanoparticle is proposed. Consequently, ultra-high compressive strength and high flexural strength are achieved, measuring as high as 1102 MPa and 455 MPa, respectively. The compressive strength at the microscale even reaches a remarkable 5.17 GPa. The superior strength of the bulk material is primarily attributed to the Y-type carbon structure and Si-C bonds. The Y-type carbon structures in graphene, produced by the self-propagating high-temperature synthesis (SHS) method, and the Si-C covalent bonds formed at the interface between graphene and SiC contribute to a tight linkage of graphene sheets , thereby preventing slippage of graphene sheets. In addition, the microstructure evolution process of Si-SHS-graphene bulk material is clarified. With the introduction of silicon nanoparticles, the oxidation resistance of graphene based bulk materials is substantially improved, the weight loss is around 6% after oxidized at 1000 °C. This study carries extensive implications for understanding the impact of Y-type carbon structures and the effect of Si-C bonds in graphene-based bulk materials.
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高影响因子
Polymer Chemistry
·
2020
·Vol. 11
·期 12
·2098-2109
·
IF 5.342
Jian Zhang,Xiaomin Zhu,Cheng Miao,Yanzhe He,Youliang Zhao
Despite tremendous progress in macromolecular self-assembly, the influence of topology and hydrolysis on hierarchical self-assembly has been scarcely revealed. This study aims at the design of toothbrush-like copolymers with linear and cyclic backbones to reveal multi-tunable properties, and the introduction of pH/oxidation-responsive and hydrolyzable Y junctions endows the copolymers with unique hydrolysis-induced topological and morphological transformations. The cyclization of the polymer backbone can lead to distinct bulk and solution properties such as chain relaxation, solution viscosity and self-assembly, revealing the crucial role of cyclic architecture. Upon pH and oxidation stimuli, at least eight kinds of distinct nanostructures involving spheres, vesicles, disks and sea urchins are achieved by self-assembly. Hydrolysis-induced (co)assembly dependent on topology, pH and hydrolysis time offers programmable formation of a diversity of nanostructures. Both toothbrushes can self-assemble into unilamellar vesicles, while the vesicles bearing cyclic toothbrushes are readily converted into double-lamellar vesicles upon heating, sonication and short-time pH stimulus. Our research can provide new insight into topology-related formation and transition processes of polymer nanoparticles. The success of this study paves the way for macromolecular engineering towards promising shape-dependent properties and applications.
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高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2022
·
IF 5.443
Zijin Yang,Xianying Qin,Kui Lin,Qiuchan Cai,Yongzhu Fu,Baohua Li
In recent years, lots of efforts have been applied to improve the initial Coulombic efficiency (ICE) of lithium-ion batteries (LIBs), among which prelithiation is considered to be one of the most promising schemes. Here we report a modified Li x Si with high lithium reserves and great environmental adaptability as the prelithiation reagent, which can make up for the capacity loss of the negative electrode in the first cycle. Through the chemical reaction between aluminum isopropoxide and Li x Si, a protective layer consisting of Li x Al y SiO z /Li 2 O is formed on the surface of Li x Si particles. This synthesized material provides a new idea for the actual industrial production of prelithiation.
研究领域:
材料科学
·
电化学
·
电池技术
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 9
·2853-2862
·
IF 4
Zurong Liao,Chaojie Li,Jiyou Zhong,Yang Li,Weiren Zhao
A broadband near-infrared (NIR) light source based on a phosphor-converted light-emitting diode (pc-LED) has attracted increasing interest to be used in non-destructive examination, security-monitoring and medical diagnosis fields, which stimulates the exploration of NIR phosphors with high performance. Herein, a series of Cr3+-activated garnet Ln3ScInGa3O12:Cr3+ (Ln = La, Gd, Y, and Lu) phosphors were reported, allowing an emission peak ranging from 726 to 822 nm. Among them, Y3ScInGa3O12:Cr3+ with an optimized Cr3+-doping concentration of 6 mol% exhibits a high internal quantum efficiency (IQE = 83.1%) and excellent absorption efficiency (AE = 44.2%) under 450 nm blue light excitation, enabling an external quantum efficiency as high as 36.7%. Moreover, this material can maintain 93.0% of the initial intensity when heated up to 423 K, implying outstanding thermal stability. Finally, a prototype NIR pc-LED device was fabricated by coating the optimized phosphor on a 455 nm LED chip, which generates a broadband NIR emission with a peak located at 765 nm and a full width at half maximum of 127 nm. The NIR output power and NIR photoelectric conversion efficiency of this device were found to be 38.01 mW and 11.0%, respectively, under 100 mA driving current, demonstrating the feasibility of this material to be applied in NIR pc-LEDs.
研究领域:
材料科学
·
光电技术
·
光子学
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高影响因子
危险品化学品经营许可证（带存储）