Journal of Superconductivity and Novel Magnetism
·
2023
·Vol. 36
·期 2
·711-719
·
IF 1.8
Huang Danqiang,Wen Xinchao,Dai Jianfeng,Wang Qing,Liu Hui,Li Zengpeng
In this study, SrFe 12 O 19 @MFe 2 O 4 (M = Co, Ni, Zn) core–shell nanofibers were fabricated by coaxial electrostatic spinning. The composites obtained at an annealing temperature of 900 °C are composed of SrFe 12 O 19 in pure phase and MFe 2 O 4 (M = Co, Ni, Zn) in different spinels. X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and transmission electron microscope (TEM) were used to describe the structure and morphology of nanofibers. Magnetic Property Measurement Systems (MPMS) are used to characterize the magnetic properties of nanofibers. Sr@Ni and Sr@Zn fibers all exhibit a unique core–shell structure, while Sr@Co fibers are connected by a lamellar structure. The single-phase hysteresis lines for each composite indicate the presence of exchange coupling effects between the hard/soft magnetic composite phases. The magnetic properties of the composites change as the soft magnetic material in the shell layer changes. Sr@Co has the highest M s (69.43 emu/g) and M r (33.82 emu/g), whereas Sr@Zn has the highest H c (2927 Oe). The switching plant curves indicate that the best exchange coupling of the three groups of samples is for Sr@Co. The magnetic properties of the composites are explained in terms of the nanofiber diameter, the exchange coupling between the two phases, and the nature of the soft magnetic phase itself. It is shown that the exchange coupling of composites is closely related to the type of composite.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 30
·1-12
·
IF 2.8
Ding Feng,Li Jiaying,Wang Jiacheng,Wu Tengyan,Liu Xin,Yang Zeliang
Nano magnetic particles immobilized on the surface of carbon spheres ( M Fe 2 O 4 /CNS, M = Mn, Ni, Zn) composites have been obtained through a facile and environmental friendly solvothermal method. The measurement results of M Fe 2 O 4 /CNS clarified the successful preparation of M Fe 2 O 4 /CNS and characterization of composites. Meanwhile, the activation performance of M Fe 2 O 4 /CNS was also measured through catalyzing persulfate (PS) for degrading Rhodamine B. Results showed that the catalytic performance of M Fe 2 O 4 /CNS for PS activation was much stronger than that of pure CNS, and the catalytic ability of M Fe 2 O 4 /CNS was MnFe 2 O 4 /CNS > NiFe 2 O 4 /CNS > ZnFe 2 O 4 /CNS. The influence factors of Rhodamine B degradation were also investigated. When the optimum conditions were conducted, with PS 5 × 10 –3 M, MnFe 2 O 4 /CNS 0.5 g/L, initial pH 6.0, and 60 °C, 98.4% Rhodamine B degradation was obtained within 70 min. Finally, the recycle of MnFe 2 O 4 /CNS was carried out for four times, which demonstrated the favorable retrievability and reusability of MnFe 2 O 4 /CNS. The experiments also proved that the synthesized MnFe 2 O 4 /CNS was a potentially useful catalyst for contaminants degradation in water/wastewater treatment.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xinhui Sun,Yanjie Chen,Mengmeng Ji,Weiya Zhang,Zhizhong Sun,Wenyi Chu,Xin Wang
Developing efficient bimetallic Ni/Zn metal organic frameworks (MOFs) derived Ni 3 ZnC 0.7 alloy catalyst for cyclization reactions is highly anticipated. Bimetallic Ni/Zn- PTA MOFs with flower-like microspheres morphology was synthesized by using a facile hydrothermal method and used as a precursor for preparation of the catalyst. Then, a ZnO supported Ni-Ni 3 ZnC 0.7 incorporated carbon catalyst (Ni-Ni 3 ZnC 0.7 /ZnO-C) was obtained by deriving from the Ni/Zn- PTA MOFs through one-step pyrolysis. The developed Ni-Ni 3 ZnC 0.7 /ZnO-C catalyst was used as a recoverable heterogeneous catalyst for synthesis of 2-arylbenzimidazoles by cyclization reaction of phenylmethanamines and 2-nitroanilines in good yields. Various characterizations (e.g. SEM/EDX, XRD, TEM, FT-IR, XPS and Raman) revealed that the catalyst exhibited good performance for cyclization reaction, which are ascribed to particular hierarchical structure, as well as synergistic effect between Ni and Ni 3 ZnC 0.7 . As a result, the Ni-Ni 3 ZnC 0.7 /ZnO-C catalyst showed excellent stability and activity for the condensation cyclization reaction. This bimetallic MOFs-derived Ni-Ni 3 ZnC 0.7 catalyst opens up a potential way for fabricating other Carbon supported alloy catalysts in heterogeneous catalysis reactions.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Qifa Wan,Faming Zhang,Yifeng Xiong,Caiyun Shang
Using a simple and scalable solid-state synthesis process, a series of spinel-structured high-entropy oxides were systematically designed and synthesized in a Co–Mn–Fe–Cr–Ni–Zn–O system. These included (Co,Mn,Fe,Cr) 3 O 4 , (Co,Mn,Fe,Ni) 3 O 4 , (Co,Mn,Fe,Cr,Ni) 3 O 4 , (Co,Mn,Fe,Zn) 3 O 4 , (Co,Mn,Fe,Cr,Zn) 3 O 4 , (Co,Mn,Fe,Ni,Zn) 3 O 4 and (Co,Mn,Fe,Cr,Ni,Zn) 3 O 4 . The phase, microstructure and color evolution of 1/3Co 3 O 4 –1MnO-1/2Fe 2 O 3 -1/2Cr 2 O 3 –1NiO powders were studied without ZnO addition. These underwent four phase evolution processes and three color evolution processes before forming the final phase of black, octahedral (Co,Mn,Fe,Cr,Ni) 3 O 4 powders. The formation of an intermediate phase of (Co,Mn,Fe) 3 O 4 medium-entropy oxide powders served as the foundation for the creation of other high-entropy oxide powders. The infrared radiation properties of these synthesized medium and high-entropy oxides powders were evaluated in the near-infrared region at room temperature. Among these synthesized powders, the infrared emissivity values of (Co,Mn,Fe) 3 O 4 , (Co,Mn,Fe,Ni) 3 O 4 and (Co,Mn,Fe,Cr,Ni) 3 O 4 powders exceeded 0.8. All the synthesized powders exhibited excellent thermal stability after being annealed at high temperatures. Notably, after being annealed at high temperatures, the infrared emissivity values of these synthesized powders increased markedly without degradation, surpassing a value of 0.8, and displayed potential for applications in the field of high-temperature infrared energy savings.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·
IF 6.3
Xiaohui Ma,Anran Guo,Liwen Yan,Lingyi Meng,Heng Chen,Xiaoxia Hu,Jinyu Wu,Jiachen Liu
As high emissivity emitters, traditional pseudobrookite ceramics are limited in thermal protection applications due to their structure degradation at high temperatures. In this work, a high-entropy pseudobrookite, (Mg,Co,Ni,Zn)Ti 2 O 5 , was designed, and CoTi 2 O 5 was selected as a single-component counterpart to evaluate the high-entropy effect on phase stability and emissivity. After heating at 1400 °C for 15 h, (Mg,Co,Ni,Zn)Ti 2 O 5 retained a single pseudobrookite phase with nearly unchanged emissivity, whereas CoTi 2 O 5 exhibited obvious phase degradation and emissivity deterioration. The higher 2.5–7 μm emissivity of (Mg,Co,Ni,Zn)Ti 2 O 5 was attributed to its narrower band gap (2.66 eV) and a higher oxygen vacancy fraction (56.87%). When coated on alumina-silica fiber fabric, the (Mg,Co,Ni,Zn)Ti 2 O 5 coating exhibited improved thermal-protection performance owing to its high infrared emissivity and reduced heat conduction, while maintaining good mechanical properties after heat treatment. These results demonstrate that (Mg,Co,Ni,Zn)Ti 2 O 5 is a promising high-emissivity ceramic for extreme thermal environments.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yiqiong Yang,Yubin Zhang,Juan Han,Shujian Cai,Lun Xiao,Kaiquan Li,Xiaodong Zhang
Although several strategies were developed to activate peroxydisulfate (PDS) through layered double hydroxides (LDHs) for the degradation of organic contaminants, effectively utilizing the structure of LDHs to improve active sites and electron transfer efficiency remained a challenge. The research prepared Ni-Zn-Al LDH-0.1-PDS composite materials through ion exchange. After the PDS intercalated, the efficiency of degradation was significantly improved. The material showed optimal performance at Ni/Zn = 0.1, under the conditions of 1 g/L dosage and 10 mg/L ciprofloxacin (CIP), the degradation rate reached 89.86 % within 120 min. The quenching experiment demonstrated that the reaction was dominated by non-radical pathways represented by e − (80.53 %), h + (70.47 %), and 1 O 2 (58.70 %) and assisted by free radicals denoted as O 2 − (27.84 %). The DFT calculation revealed that the O O bond length increases while the bond energy diminishes upon the incorporation of S 2 O 8 2− into the LDH interlayer, illustrating that PDS existed in a metastable state within the LDH interlayer, where the O O bond exhibited heightened reactivity, facilitating electron acquisition and subsequent cleavage due to the interlayer confinement effect of LDH on anions. This research offered novel insights on altering the composition and structure of LDHs to promote non-radical activation of PDS.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Yuxiang Ou,Xiangjian Liao,Shiquan Chen,Xingyu Liu,Rui Li,Yonglin Chen,Yifei Wang,Zixuan Wu,Aiping Huang,Xianzhe Liu,Jianyi Luo
The non-invasive detection of acetone in exhaled breath via gas sensors offers a simple and efficient strategy for the auxiliary diagnosis of diabetes. Spinel ferrites have emerged as promising candidates for sub-ppm acetone detection due to their outstanding physicochemical and electronic properties. Despite the development of diverse spinel ferrites, the intrinsic correlation between cation type (i.e., M 2 + in the MFe 2 O 4 structure) and these materials’ gas-sensing properties has not been systematically elucidated. In this study, spinel ferrites with different metal ions (MFe 2 O 4 , M = Fe, Co, Ni and Zn) were synthesized via a facile one-step solvothermal method. The effects of cation type on the crystal structure, microstructural features, and acetone-sensing performance of these ferrites were systematically studied. It demonstrates that the cation type exerts a significant influence on the grain size, morphological and microstructural characteristics, and gas-sensing kinetics of these ferrites, thereby regulating their overall acetone-sensing performance. Notably, the NiFe 2 O 4 sensor exhibits superior acetone-sensing properties toward 1.0 ppm acetone at its optimal operating temperature, including a high response value, a low detection limit, excellent humidity tolerance, outstanding selectivity, and long-term stability. Furthermore, the NiFe 2 O 4 sensor can effectively distinguish acetone concentration differences in exhaled breath between healthy individuals and diabetic patients (using simulated samples). These results clarify the intrinsic correlation between cation type and acetone-sensing performance of spinel ferrites, providing practical guidance for the rational design of high-performance acetone-sensing materials and promoting their application in breath-based auxiliary diagnosis of diabetes.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yan Yang,Xiaohui Li,Jie Li,Yu Xiong,Yang Xiao,Wei Zhou,Zongcheng Su,Junhao Xiong,Jinxin Zhou,Huaiwu Zhang
NiCuZn ferrites with high saturation magnetization and low magnetic loss in the microwave band have attracted significant attention for applications in microwave devices, especially in phased-array systems. However, achieving device miniaturization and integration while simultaneously maintaining low loss and excellent gyromagnetic performance remains a major challenge. In this study, the grain size effect on the gyromagnetic properties and magnetic loss suppression in NiCuZn ferrites was investigated by incorporating Bi 2 O 3 and nano-NiZn ferrite additives. The results show that the addition of Bi 2 O 3 effectively lowers reaction activation energy and reduces the sintering temperature, facilitating easy densification of the ferrite material. Benefiting from the synergistic effect of nano-NiZn ferrite addition and Bi 2 O 3 -assisted liquid-phase sintering, dense NiCuZn ferrites with a uniform grain size (G avg. = 7.62) and a high density ( ρ m = 5.32 g/cm 3 ) are obtained, leading to enhanced gyromagnetic properties and reduced magnetic loss. Consequently, the NiCuZn ferrite ceramic with optimized composition exhibits an ultra-low magnetic loss ( ΔH = 126 Oe), low dielectric loss (tanδ ε = 0.033) and an improved saturation magnetization (4π M s = 4159 G). This study provides a simple and effective strategy for achieving dense and compact grain structures, offering guidance for the design of miniaturized and low-loss microwave devices.
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高影响因子
FUEL
·
2023
·
IF 7.4
Somboon Chaemchuen,Zhonghan Cheng,Xiaotong Hou,Francis Verpoort,Jakkapan Kumsi,Nikom Klomkliang
High-efficient adsorptive materials for carbon dioxide (CO 2 ) capture and separation of a gas mixture are vital for energy consumption and emission reduction but are still a substantial challenge. A facile synthesis of bimetallic nickel/zinc embedded in N-doped carbon (Ni/Zn@NC) through the solid–solid thermal method (SST) is developed herein. The SST method is a straightforward procedure with the advantage that the materials are obtained in a single step and solvent-free conditions. Thermal analysis and material characterization were used to investigate the synthesis mechanism during the SST process. The results revealed that an intermediate material, initially obtained at a low thermal temperature, was sacrificed to generate Ni/Zn@NC at high temperatures of the SST method. The resulting robust carbon structure, decorated with heteroatoms (Ni, Zn, N), exhibits a potential for efficient CO 2 adsorption during the capture and separation of biogas (CO 2 /CH 4 ), off-gas (CO 2 /N 2 ), and natural gas (CH 4 / N 2 ). The synergetic effect of Ni in the materials enhances the selectivity of S CO2/CH4 , S CO2/N2 , and S CH4/N2 . The improved selectivities by effective sites were confirmed by computational modeling. Significantly, the Ni/Zn@NC material obtained through a mild yet simple synthesis method (SST) exhibits substantially higher CO 2 adsorption capacity and selectivity when compared to commercial carbon (activated charcoal).
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JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Xiao Zeng,Zhanhong Yang,Jinlei Meng,Linlin Chen,Hongzhe Chen,Haigang Qin
The porous ZnO/C composites derived from metal organic framework-5 (MOF-5) is obtained via a calcination method subsequent to hydrothermal process. The results of materials characterization analysis show that the porous ZnO/C composites is well-crystallized with cube morphology and possesses a large specific surface area. According to the electrochemical measurements, the porous ZnO/C composites as anodic materials for Nickel–Zinc rechargeable battery exhibits excellent electrochemical performance compared with that of the commercial ZnO, keeping the discharge specific capacity at 587 mAh g −1 with the capacity retention ratio of about 89.1% after 800 cycles. The outstanding electrochemical property of porous ZnO/C composites can be ascribed to the interconnected conductive network generated by the carbon layer and stable cube architectures derived from metal organic framework-5 precursor, which can facilitate the transportation of electrons and restrain the formation of zinc dendrites during repeated charge-discharge cycling. Furthermore, a novel sphere structure consisting of numerous intersecting disk-like sheets is transformed from the cubic porous ZnO/C composites after 600 cycles, which can contribute to the uniform current distribution and improve the performance of energy storage, revealing the truth for the long cycle life of porous ZnO/C composites.
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ACS Applied Energy Materials
·
2024
·
IF 5.4
Hao Shi,Haozhen Li,Xing Zhou,Chongqing Yang,Hengyong Tu,Jun Tong,Longkai Xiang,Chao Ma,Lei Zhu,Zhen Huang
Spinels have been widely employed as contact layers (CLs) on metallic interconnects for solid oxide cells (SOCs) with the required electrical conductivity and Cr block ability. In this work, MnCo2O4 spinels doped with different transition metals (Cu, Ni, and Zn) were deposited on precoated SUS441 stainless steel as CLs. A positive doping effect of Cu and Ni on increasing the concentration of Mn4+/Mn3+ and Co3+/Co2+ hopping pairs was observed, whereas a negative doping effect of Zn on electrical conductivity was confirmed, which was reflected in the data of X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectra (XAS). The Cu-doped Mn1Co1.7Cu0.3O4 spinel exhibited the best electrical conductivity with a low area specific resistance (ASR) value of 4.5 mΩ·cm2 at 850 °C. A relative degradation test demonstrated that Mn1Co1.7Cu0.3O4 maintained significant performance during a 200 h isothermal process. Cross-sectional observations revealed that the thickness of the Cr oxide scale formed during the degradation test was much reduced by the Mn1Co1.7Cu0.3O4 CL, which was attributed to the improved resistance to Cr oxidation. The present work shed light on the design of highly conductive CLs in SOCs.
研究领域:
材料科学
·
能源科学
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 37
·17531-17544
·
IF 3.5
Zhao Shifeng,Ou Yanwen,Zhao Yanping,Liu Yuqin,Lv Fengzhu
Ferroan brucite with different Fe 2+ doping amounts (Mg 1-X Fe X (OH) 2 , x = 0.3, 0.4, 0.5, 0.6, 0.7 and 0.8) was synthesized for the removal of Congo red (CR) from wastewater. As the Fe 2+ content increased, the removal efficiency initially increased and then decreased, and Mg 0.6 Fe 0.4 (OH) 2 exhibited the maximum removal amount which was 2745.96 mg/g. The high removal ability of Mg 0.6 Fe 0.4 (OH) 2 was derived from the combined removal mechanism. The removal amount of CR was highly related to the amount of Fe 2+ in MgFe(OH) 2 and its existed state. The removal behaviors of M 0.7 Fe 0.3 (OH) 2 (M = Zn, Ni, Co) were also conducted to verify the function and university of Fe 2+ in the degradation process. The influence of M 2+ in M 0.7 Fe 0.3 (OH) 2 (M = Zn, Ni, Co) on the removal efficiency was explored by experimental study and calculation of the system energy and bond length change based on molecular simulation. This work provided an outstanding approach for preparation of high efficiency materials to purify organic wastewater. Graphical Abstract
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危险品化学品经营许可证（带存储）