ADVANCED POWDER TECHNOLOGY
·
2022
·
IF 4.969
Ronglin Zhao,Jianjun Huang,Yu Yang,Lixin Jiao,Yaqiang Dong,Xincai Liu,Zhonghao Liu,Shouding Wu,Xubin Li,Aina He,Jiawei Li
In this work, a new type of FeSi/FeNi soft magnetic powder core (SMPC) was successfully fabricated by coating FeNi nanoparticles on the surface of FeSi micrometer powder. The effects of different contents of FeNi nanoparticles on the micromorphology, internal structures, and soft magnetic properties of SMPCs were studied. The results show that FeNi nanoparticles adhere to the surface of FeSi powder, which can effectively fill the air gap between FeSi powder and is beneficial to the compaction of the powder cores during the pressing process. Thus, the density of the SMPCs is increased. Compared to FeSi SMPCs, the comprehensive soft magnetic properties of FeSi/FeNi SMPCs have been greatly improved. When adding 15 wt% FeNi nanoparticles, the SMPCs exhibit excellent magnetic properties with high effective permeability (increased by 43.8 %) and low core loss (decreased by 22.1 %). The high performance FeSi/FeNi SMPCs prepared in this work are expected to be widely used in power choke coils, uninterruptible power supplies, and boosts and inverter inductors.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Chen Yuzhen,Li Qiuhong,Lin Yuxing,Liu Jiao,Pan Jing,Hu Jingguo,Xu Xiaoyong
The oxygen evolution reaction plays a vital role in modern energy conversion and storage, and developing cost-efficient oxygen evolution reaction catalysts with industrially relevant activity and durability is highly desired but still challenging. Here, we report an efficient and durable FeNi hydroxide organic framework nanosheet array catalyst that competently affords long-term oxygen evolution reaction at industrial-grade current densities in alkaline electrolyte. The desirable high-intensity performance is attributed to three aspects as follows. First, two-dimensional nanosheet porous arrays with maximum specific surface facilitate mass/charge transfer to accommodate high-current-density catalysis. Second, in situ derived FeNi hydroxide motifs offer bimetallic synergistic catalysis centers with high intrinsic activity. Third, carboxyl ligands alleviate metal oxidation favorable for charge tolerability against peroxidation dissolution under strong polarization. As a result, this catalyst requires an overpotential of only 280 mV to deliver high current density up to 1 A/cm 2 with long durability over 1000 h. Moreover, an alkaline water electrolyzer with this catalyst alternative demonstrates an increased economic effectiveness compared to commercial levels at present.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2014
·Vol. 43
·期 21
·7924-7929
·
IF 4.097
Linyi Zhou,Ming Wen,Qingsheng Wu,Dandan Wu
Magnetic FeNi@Ni nanocables were prepared as a superior recyclable catalyst towards the hydrogenation reduction of p-nitrophenol to p-aminophenol through a two-step tunable assembly process in a solvothermal system. The proposed fabrication mechanism was verified through characterization by SEM, TEM, XRD, XPS, and UV-Vis. The as-prepared FeNi@Ni nanocomposites are core–shell-structured nanocables with Ni nanoparticles (NPs) attached on FeNi nanorods (NRs) surface loosely. The catalytic reactivity monitored by means of a UV-vis dynamic process shows FeNi@Ni nanocables can catalyse the transformation of p-nitrophenol to p-aminophenol completely under an ambient atmosphere at room temperature, and enable the catalysis to be more efficient than its counterparts FeNi NRs and Ni NPs due to the interfacial synergistic effect. Additionally, the resultant hierarchical metal–alloy nanocomposites possess ferromagnetic behaviour, and can be easily separated and recycled by an external magnet field for application.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xianzhi Yin,Kai Zhu,Ke Ye,Jun Yan,Dianxue Cao,Dongming Zhang,Jiaxin Yao,Guiling Wang
The direct urea fuel cell (DUFC) is a power generation equipment with urea-rich wastewater or urine as fuel source. It has the unique ability to purify sewage while simultaneously generating electricity, making it a highly efficient and environmentally friendly option. In this paper, pomegranate seed-like Ni nano-blocks and Fe nanosheets were synthesized by electrodeposition and chemical reduction and attached to the carbonized melamine sponge matrix. The N -doped carbon sponge (NCS) provided a large number of polyhedral holes, which allowed for efficient gas escape through channels. The combination of Fe reduces the initial urea oxidation potential, reaction activation energy and reaction resistance. The synthesized FeNi supported on N -doped carbon sponge composite (FeNi@NCS) has a catalytic current density of 625 mA cm −2 and a Tafel slope of 42.51 mV dec −1 for urea electrooxidation reaction (UOR). Assembling the direct urine-hydrogen peroxide fuel cell (DUrHPFC) resulted in the highest performance output. The open circuit voltage (OCV) was 0.98 V, and the peak power density reached 9.61 mW cm −2 . The results show that the prepared catalyst provides an opportunity to solve the problems that hinder the development of urea green cycle at present.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fangyu Gan,Zhenpeng Li,Qingrong Yao,Shasha Jiang,Xiaochang Yu,Jianqiu Deng,Zhao Lu,Lichun Cheng,Maomi Zhao,Huaiying Zhou
Polarization loss and conduction loss are the important attenuation mechanisms in dielectric loss dominant electromagnetic wave (EMW) absorbers, but their synergistic effects in different frequency bands need to be further investigated. In this study, FeNi/ZnO/C/Ni 3 ZnC 0.7 composites (FNZC) were synthesized using a simple and environmentally friendly template-sacrificing method, with water as the only solvent. By varying the elemental addition, the phase and microstructure of the final product can be controlled, which in turn affects the conduction loss and polarization loss, thus altering the EMW absorption performance. The minimum reflection loss (RL) value and EAB of the optimized FNZC composite are –49.23 dB and 5.48 GHz (12.32–18.00 GHz), respectively, covering 99.9 % of the Ku band. Additionally, the RLmin values in the S, C, and X bands are below –17 dB. Based on the component regulation strategy and the analysis of electromagnetic parameters, Cole-Cole curves, and EMW absorption performance, it can be concluded that conduction loss is the primary factor contributing to strong absorption of low-frequency EMW. In contrast, interfacial polarization and defect-induced polarization are the main factors for strong absorption of medium- and high-frequency EMW.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Fangyu Gan,Qingrong Yao,Jianqiu Deng,Feng Wang,Lichun Cheng,Yucheng Chen,Huaiying Zhou,Yan Zhong,Huabin Yang,Yazhou Zhao
Layered double hydroxides (LDH) are employed as a promising template to prepare magnetic polymetallic alloys with hierarchical or hollow structure, being regarded as the promising candidates for the lightweight and high-performance electromagnetic wave (EMW) absorption materials . However, the application of LDH-derived magnetic alloys in EMW absorption is still limited by the single loss mechanism and poor impedance matching properties. Coupling with dielectric materials is a viable strategy to solve the issue. Herein, flower-like hierarchical FeNi@C microspheres are fabricated by pyrolysis of FeNi-LDH precursors, which display excellent EMW absorption performance . Good impedance matching and strong absorption capability of the FeNi@C microspheres can be realized by regulating the phase composition and microstructure under different pyrolysis temperatures. When pyrolyzed at 700 °C, the FeNi@C microspheres exhibit a strong reflection loss (RL) of −30.4 dB with ultra-thin matching thickness of only 1.2 mm, achieving the widest effective bandwidth (RL < −10 dB) of 4.6 GHz at 1.4 mm. The superior EMW absorption performance of the FeNi@C-700 sample is ascribed to the synergistic effects of hierarchical structure with multiple reflection, FeNi particles with magnetic loss and carbon matrix with dielectric loss. Thus, the as-obtained FeNi@C microspheres can be a prospective lightweight EMW absorber. This work can also provide guidance for design and development of hierarchical LDH derivatives in EMW absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Electronic Materials
·
2024
·Vol. 11
·期 2
·2400265
·
IF 5.3
Jiaao Yu,Hui Luo,Sihai Lv,Zhihui Wang,Fu Chen,Yongzhi Cheng,Xiangcheng Li
The development of novel materials with high-efficiency microwave absorption is crucial for mitigating the adverse impacts of electromagnetic pollution. In this study, MXene and FeNi Prussian blue analogs (PBA) are assembled onto a melamine foam using self-assembly and in situ growth technique. Subsequently, magnetic carbon foam, comprising FeNi alloys, TiN and carbon with various morphologies, is synthesized via carbothermal reduction reaction. The surface morphology electromagnetic properties are significantly influenced by the pyrolysis temperature. The results revealed that the magnetic carbon foam composite demonstrated an effective microwave absorption bandwidth of 4.72 GHz at a thickness of only 1.5 mm, with a minimum reflection loss of −24.83 dB at 1.3 mm. The outstanding microwave absorption performance can be attributed to the 3D conductive network formed by N-doped carbon, as well as the contributions from polarization loss, magnetic loss, and suitable impedance matching. Furthermore, the corresponding absorber coating demonstrated a maximum reduction value of radar cross-section (RCS) by 13.16 dB m 2 . This research offers novel insights for the development of lightweight and efficient low-filled electromagnetic composite for broadband microwave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Run Wu,Xixi Wang,Lei Ge,Zehao Zheng,Yijun Zhu,Chuan Zhou,Jinglin Yuan,Shiliang Zhu,Yuxing Gu,Wei Zhou,Zongping Shao
Zinc-air batteries (ZABs) have sparked great interest, but their wide-ranging applications are limited by sluggish cathode reactions (ORR and OER). In this work, a multifunctional 3D catalyst (FeNi alloy/porous carbon) was easily fabricated by introducing Fe 3+ and Ni 2+ to modulate in-situ vapor phase grown carbon nanotubes. The as-prepared catalyst FNSNC73-800 displays abundant mesoporous, massive structural defects , and multiple active sites, which greatly facilitate the transport of oxygen species and charge transfer during the reaction. Due to the excellent ORR and OER performance, FNSNC73-800 shows a narrow voltage gap (Δ E ) of 0.76 V, which is superior to recent reports. Notably, the secondary zinc-air battery with this catalyst displays a high-peak power density (210 mW cm −2 ), while maintaining an ultra-low potential gap (0.74 V) after a long-term charge-discharge cycle of 200 h. This effort presents a facile strategy for designing economical and efficient 3D catalysts for zinc-air batteries and more energy devices.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Fangyu Gan,Yongle Jiang,Qingrong Yao,Jianqiu Deng,Lichun Cheng,Yan Zhong,Zhao Lu,Jiang Wang,Qianxin Long,Huaiying Zhou,Guanghui Rao
Functional core-shell heterostructure, which can integrate the characteristics of multiple components to achieve synergistic effects, have been widely explored in electromagnetic wave (EMW) absorption materials. In this work, core-shell ZnO@ZnO/FeNi microrods (MRs) derived from ZnO@ZnFeNi hydroxide (ZnFeNi OH) are prepared by a simple hydrothermal reaction and subsequent pyrolysis process. The introduction of FeNi alloy helps to optimize the impedance matching of ZnO, thus improving the EMW absorption performance. The different impedance matching properties of core-shell ZnO@ZnO/FeNi MRs are realized by adjusting the ZnO/FeNi shell thickness by changing the hydrothermal reaction time. When the hydrothermal time is 10 h, the core-shell ZnO@ZnO/FeNi MRs supplies the optimal EMW absorption performance with the minimum reflection loss of −53.7 dB and the widest absorption bandwidth of 5.3 GHz at a filler content of 33%. The synergistic effect of ZnO–FeNi interfacial polarization and the strong dielectric-magnetic loss are responsible for its superior EMW absorption performance. This work provides a valuable strategy for constructing core-shell dielectric@ magnetic composites to obtained high efficiency absorber.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xixi Ji,Yao Wan,Dan Xu,Xiaotong Pang,Yonggang Tong,Jingzhong Fang,Wei Xie,Yuanqiang Luo,Yaqi Ren,Yongle Hu
According to the escalating concern regarding the health hazards associated with electromagnetic radiation , the significance of absorbing materials underscores which could mitigate the healthy risks. While magnetic materials offer excellent absorption performance, their high density poses challenges to achieving optimal absorption efficiency. Conversely, carbon-based materials are known for their lightweight and versatile but face impedance matching issues. To address these obstacles, carbon/magnetic composite materials have been explored. However, their absorption performance has not fully met requirements due to weaker magnetic properties and increased density. Herein, we synthesized a porous carbon material embedded with magnetic FeNi/NiFe 2 O 4 and dielectric SiO 2 nanoparticles (FeNi-NiFe 2 O 4 -SiO 2 @PC) using carbonthermal method. By adjusting the ratio of polyvinylpyrrolidone to nitrates, the electromagnetic wave (EMW) absorption performance is adjusted. The FeNi-NiFe 2 O 4 -SiO 2 @PC composites display remarkable EMW absorption properties, achieving a minimum reflection loss of −69.9 dB at a thin thickness of 1.495 mm and a maximum effective absorption bandwidth of 5.68 GHz, covering the range from 12.32 to 18.0 GHz at a thickness of 1.92 mm. This outstanding performance can be attributed to the favorable impedance matching and the three-dimensional porous structure, which facilitates a 3D transmission network for multiple reflections. Additionally, the presence of FeNi, NiFe 2 O 4 , and SiO 2 nanoparticles enhances magnetic loss, conductive loss, interface polarization, and dipolar polarization, leading to excellent ab. Hence, this work offers insights into the composition design of high-performance absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Xiao Jia,Yingying Wang,Junlei Tang,Kaikai Song,Hailong Zhang,Bing Lin,Hongpeng Zheng
Water electrolysis is a promising sustainable technology for hydrogen production . To achieve large-scale commercialization, electrocatalysts must meet specific performance requirements, such as low cost, high durability, and the ability for high-yield and high-quality production on a macroscopic scale. This study focuses on the preparation of self-supported electrodes for water splitting using stainless steel (SS) as the conductive carrier of the catalytic electrode. In alkaline conditions, FeNi-LDH@Ni films were grown on the surface of stainless steel, resulting in efficient and stable electrodes (FeNi-LDH@Ni/SS). The electrodes exhibited low overpotentials of 399 mV and 212 mV for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively, to reach a current density of 10 mA cm −2 . Amplified electrodes with a surface area of 1 dm 2 were tested in an industrial environment of 6 M KOH at 60 °C. The two-electrode alkaline water electrolyzers (AWE) composed of the two FeNi-LDH@Ni/SS electrodes demonstrated excellent stability for 100 h and required only 1.744 V to reach a current density of 10 mA cm −2 . This study provides insight into the development of stable, efficient, and low-cost electrodes for industrial water splitting applications.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Zhiqiang Peng,Hongyue Li,Jiaqi Li,Feng Ao,Yue Cheng,Kai Huang,Jun Yao,Peng Wang,Yupei Zhao
The development of efficient non-precious metal catalysts is crucial for the large-scale application of hydrogen production via water electrolysis. Coupling FeNi catalysts with transition metal chalcogenides has proven to be an effective strategy for enhancing catalytic performance. However, limited attention has been given to simultaneously regulating electronic structure and local environmental factors. In this work, we synthesised Fe-Ni-C and NiSe heterostructures, that leverage enhanced water adsorption and rapid electron transfer at their surfaces. Among them, NS/2Fe-Ni-C@600 exhibits excellent catalytic performance, requiring low overpotentials of only 276 mV for oxygen evolution reaction (OER) and 292 mV for hydrogen evolution reaction (HER) reaching to 10 mA·cm −2 in 1 M KOH. Moreover, it exhibited remarkable stability, with no significant degradation observed during 12 h of constant potential stability testing. Simulation calculations show that NiSe increases the water adsorption capacity at the Fe-Ni-C interface on the OER reaction process on the metal catalyst surface at the microscopic level. It regulates the orbital overlap between Fe and Ni above the Fermi energy level, and effectively reduces the adsorption energy of electrolytic water reaction intermediates of Fe-Ni-C. This strategy of constructing heterojunctions between bimetallic catalysts and transition metal sulfides modulates the electronic structure and enhances the surface water distribution, which contributes to improving the reactivity of electrolytic water catalysts. This study further deepens the design and understanding of bimetallic catalysts.
研究领域:
材料科学
·
电化学
·
能源催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）