Journal of Superconductivity and Novel Magnetism
·
2023
·Vol. 36
·期 3
·923-929
·
IF 1.8
Zhang Chaoyun,Peng Xiaoling,Li Jing,Ellis Tristan,Wu Qiong,Xu Jingcai,Hong Bo,Wang Xinqing,Ge Hongliang
Fe 4 N/Fe 3 N soft magnetic composites (SMCs) prepared by gas nitriding were studied. In this paper, Fe 4 N was obtained by nitriding pure iron in NH 3 /H 2 , then nitrided by pure ammonia gas to obtain Fe 4 N/Fe 3 N SMCs. The morphology, structure, and magnetic properties were studied by SEM, VSM, B-H Tester, and Impedance Analyzer. With the increase of nitridation time, Fe 3 N content gradually increased and reached saturation after nitriding for 5 h, saturation magnetization M S decreased, and M s was equal to 178.4 emu/g when nitriding time reached 8 h. With the increase in frequency, the effective permeability of Fe 4 N/Fe 3 N SMCs decreases, and the core loss increases. The synthesis of Fe 3 N generally reduced the effective permeability and loss of Fe 3 N/Fe 4 N SMCs, except for the 8 h nitrided sample. With the increase in frequency, complex permeability also decreased and tended to be stable. 8 h nitrided SMC has the largest Q and μ′.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Yixuan Liu,Zhilin Yang,Hua Yang
Magnetic γ′-Fe4N has been considered as one of the most promising non-noble materials for the electrocatalysis of the oxygen evolution reaction (OER) due to its excellent magnetic properties, unique anti-perovskite-like structure, high chemical stability, and high intrinsic activity. Exploring environmentally friendly and efficient nitrogen sources instead of ammonia is still a huge challenge associated with obtaining pure γ′-Fe4N. In addition, it is widely acknowledged that the unique morphological and structural tuning of metal nitrides could effectively enhance their electrocatalytic capabilities. In this study, two kinds of magnetic γ′-Fe4N with different morphologies (cuboidal and rodlike) are obtained by combining facile solvent-regulated ferrous oxalate precursors with ethylenediamine-assisted thermal nitriding. The facile morphological tuning endows γ′-Fe4N with excellent soft magnetic properties while improving the activity toward OER. Specifically, the saturation magnetization of cuboidal γ′-Fe4N reaches up to 167.38 emu g–1. In addition, compared with the RuO2 benchmark for OER, cuboidal γ′-Fe4N shows more excellent OER electrocatalytic performance, showing an overpotential of 253 mV@10 mA cm–2 in 1.0 M KOH and a low Tafel slope (45 mV dec–1). This is of great significance for the non-ammonia synthesis of iron nitride and the development of non-noble-metal-based OER electrocatalysts.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yuqing Dong,Chengsen Li,Shuting Zhang,Xiangwei Meng,Meijie Yu
Prussian blue (PB) as a type of metal-organic framework has attracted widespread attention in the field of electromagnetic wave (EMW) absorption due to its adjustable composition and structure. N-doped porous carbon/rGO/Fe 4 N composite is prepared by carbonizing and nitriding PB precursor. Fe 4 N/rGO/NPC exhibits the minimum reflection loss (RL min ) is −53.09 dB at 16.16 GHz of 2.2 mm, with an effective absorption bandwidth (EAB) value of 7.84 GHz (10.16–18 GHz) at 2.6 mm. The EMW absorption mechanisms analysis displayed that excellent impedance matching and various attenuation pathways including magnetic loss, conduction loss, interfacial and dipole polarization synergistically contributed to the high EMW absorption performances. The results indicate that the Fe 4 N/rGO/NPC composite derived from PB precursor presents great potential in the field of 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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yaqing Ge,Geoffrey I.N. Waterhouse,Jing Sui,Zhiming Zhang,Liangmin Yu
The design of composites rich heterogeneous interfaces to enhance interfacial polarization is an effective way to boost electromagnetic waves (EMW) absorption performance. In this work, multi-component electromagnetic ZnFe 2 O 4 /Fe/Fe 4 N/N-doped carbon (ZnFe 2 O 4 /Fe/Fe 4 N/N-C) composites were successfully fabricated by carbonization of core/shell/shell ZnFe 2 O 4 @PDA@PPy precursors at 800 °C under a N 2 atmosphere. The ZnFe 2 O 4 /Fe/Fe 4 N/N-C composites exhibit excellent low-frequency EMW absorption performance: the effective absorption bandwidth reached 8.41 GHz (3.57–11.98 GHz), covering the entire C-band (4–8 GHz) and X-band (8–12 GHz) at a thickness of 4.5 mm with a minimum reflection loss (RL min ) of −36.13 dB at 4.54 GHz. The excellent property was attributed to the abundant heterogeneous interfaces in the ZnFe 2 O 4 /Fe/Fe 4 N/N-C composites with maximized polarization loss. Further, magnetic loss were enhanced by the introduction of Fe 4 N. This work demonstrates that the creation of heterogeneous interfaces via adding extra components is an effective strategy in the design of efficient low-frequency EMW absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Dan Zhang,Guangshe Li,Meijie Yu,Jianming Fan,Baoyun Li,Liping Li
Iron nitrides are considered as highly promising anode materials for lithium-ion batteries because of their nontoxicity, high abundance, low cost, and higher electrical conductivity . Unfortunately, their limited synthesis routes are available and practical application is still hindered by their fast capacity decay. Herein, a facile and green route is developed to synthesize Fe 4 N/Fe 2 O 3 /Fe/porous N-doped carbon nanosheet composite. The size of Fe 4 N/Fe 2 O 3 /Fe particles is small (10–40 nm) and they are confined in porous N-doped carbon nanosheet. These features are conducive to accommodate volume change well, shorten the diffusion distance and further elevate electrical conductivity. When tested as anode material for lithium-ion batteries, a high discharge capacity of 554 mA h g −1 after 100 cycles at 100 mA g −1 and 389 mA h g −1 after 300 cycles at 1000 mA g −1 are retained. Even at 2000 mA g −1 , a high capacity of 330 mA h g −1 can be achieved, demonstrating superior cycling stability and rate performance. New prospects will be brought by this work for the synthesis and the potential application of iron nitrides materials as an anode for LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Wanjia Li,Wangchang Li,Yao Ying,Jing Yu,Jingwu Zheng,Liang Qiao,Juan Li,Shenglei Che
Soft magnetic material with high saturation magnetization ( M s ) and high resistance ( ρ ) is vital to improve the power density and conversion efficient of modern electrical magnetic equipment. Yet, increasing M s is always at the expense of high resistivity, such as soft magnetic alloys substitute for the ferrite. In this work, the superior comprehensive electromagnetic properties, namely the close association of high saturation magnetization and high resistivity, are combined in a new way in a newly Fe-N based magnetic materials. A high resistance oxide interface engineering was constructed between the conducting ferromagnetic phases in the process of spark plasma sintering (SPS) to achieve superior electromagnetic properties. The ZnO composite γ' -Fe 4 N bulk has a maximum resistivity of 220 μΩ cm and a M s of up to 156.02 emu/g, while the TiO 2 composite γ' -Fe 4 N bulk has a maximum resistivity of 379 μΩ cm and a M s of 149.7 emu/g. The research findings offer valuable insights for the advancement of the next generation of soft magnetic materials, which hold significant potential for use in high-frequency, high-efficiency, and energy-saving power equipment applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Sheng-Nan Zhuo,Hao Sun,Zhi-Ying Wang,Hong-Yu Ren,De-Feng Xing,Nan-Qi Ren,Bing-Feng Liu
This study, a magnetic biochar catalyst (Fe-N@MFC) with Fe 3 C and Fe 4 N was synthesized via one-step pyrolysis using waste floc as a raw material. Fe-N@MFC shows an efficient catalysis in activating peroxydisulfate (PDS) to degrade tetracycline (TC). 90.5 % of TC (5 mg/L) is removed within 60 min in the Fe-N@MFC/PDS (0.5 g/L and 1.8 mM) system with a degradation rate constant of 0.33043 min −1 . Reactive oxygen species (·OH, SO 4 ·− , 1 O 2 , and ·O 2 − ) and electron transfer are generated in the reaction system. ·OH and SO 4 ·− radicals make a major contribution to TC degradation . Variation in material structure and DFT calculations prove that the existence of Fe 3 C and Fe 4 N enhances the adsorption energy of PDS and promotes the redox reaction between PDS and Fe species (Fe 0 and Fe-N). Based on iron ion leaching, recycling experiment and application in real water, the Fe-N@MFC catalyst is found to exhibit promising potential. This work represents a progress compared to the traditional technology used for preparing Fe N C biochar catalysts and provides significant guidance for the further development of biochar in the future.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yuqing Dong,Chengsen Li,Shuting Zhang,Xiangwei Meng,Meijie Yu
Porous structure design and magnetic-dielectric composite are effective ways to develop electromagnetic wave (EMW) absorbing materials with light-weight, thin-thickness, large effective absorption bandwidth (EAB), and strong reflection loss (RL). This article presents a simple one-step nitridation method for synthesizing Fe 4 N@C compounds with sea-island like and core-shell structures. The optimal RL value of Fe 4 N@C is up to −60.01 dB, and the EAB (frequency range for RL< −10 dB) is 5 GHz (11.1–16.1 GHz) with a thickness of 1.9 mm. The EAB reaches 5.5 GHz (12.5–18 GHz) when the matching thickness is 1.7 mm. The multi-component design achieved excellent impedance matching properties. The carbon frame connects the core-shell particles to form a three-dimensional porous structure, providing multiple reflection losses. Therefore, this work provides a convenient way to design efficient and lightweight EMW absorbers with special structures.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 10
·6538-6546
·
IF 12.732
Meng Zhang,Lu Wang,Bin Wang,Bo Zhang,Xiuping Sun,Debao Wang,Zhen Kong,Liqiang Xu
Lithium–sulfur batteries have attracted increasing attention in the field of energy storage due to their advantages of high specific energy and energy density. However, there are still many difficulties in the practical application of lithium–sulfur batteries, such as large volume expansion of sulfur and shuttle effect of polysulfides, which led to rapid capacity attenuation and poor cycling performance. To address these problems, herein, nanosized phosphorus-modified Fe4N supported by nitrogen, phosphorus co-doped graphene nanosheets (P-Fe4N@NPG) has been synthesized by a simple solvothermal method combined with subsequent nitriding and phosphating calcination, and then used as a sulfur host for lithium–sulfur batteries. Benefiting from the high electrical conductivity, multiple composition and unique structure, the obtained P-Fe4N@NPG/S cathode exhibits excellent electrochemical performances: the cathode presents a high initial specific capacity of 1386.1 mA h g−1 at 0.1C, distinct cycling performance (417.4 mA h g−1 at 1C after 1000 cycles) and excellent rate performance with a sulfur loading of 73 wt%. Even if the sulfur loading increases as high as 3.52 and 5.65 mg cm−2, the cathode still displays an excellent rate performance and outstanding areal capacity of 6.03 mA h cm−2, respectively. These results indicate that our design of P-Fe4N@NPG is a great development in the application of sulfur hosts for lithium–sulfur batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 19
·11792-11801
·
IF 10.733
Xiang Ao,Wei Zhang,Zhishan Li,Lin Lv,Yunjun Ruan,Hong-Hui Wu,Wei-Hung Chiang,Chundong Wang,Meilin Liu,Xiao Cheng Zeng
The scarcity and weak durability of precious metal catalysts are among the biggest obstacles to achieving cost-effective electrocatalysts in fuel cells and metal–air batteries. Hence, it is imperative to develop low-cost non-precious metal catalysts with comparable oxygen reduction reaction (ORR) activity to precious metal catalysts. Herein, we report a highly effective strategy for the facile synthesis of Fe/N-functionalized 3D porous carbon networks. A major advantage of the newly designed catalyst is that ultrafine Fe4N nanoparticles are grown and uniformly mounted on the carbon framework upon pyrolysis treatment at 800 °C, and co-exist with numerous in situ formed Fe–N4 moieties in the carbon matrix, being evidenced by using X-ray absorption and photoelectron spectroscopy. The new electrocatalysts exhibit high ORR activity, comparable/superior to that of the state-of-the-art Fe/N–carbon based catalysts reported to date. Specifically, the catalysts show a half-wave potential of 0.890 V (vs. RHE) and a limited current density of 6.18 mA cm−2. By resorting to experimental measurements and density-functional theory (DFT) calculations, the synergistic effects between Fe–N4 moieties and the Fe4N support are identified for the first time, which play a key role in boosting the catalytic performance of the Fe/N-functionalized porous carbon networks.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Xiangwei Meng,Shuting Zhang,Meijie Yu,Chengguo Wang
Beneficial from the high electrical conductivity and remarkable chemical stability, transition metal nitrides have attracted widespread attention in the employment of electromagnetic wave absorption. Toward this end, Fe 4 N/zirconium dioxide/carbon nanofibers composited absorber was triumphantly prepared by the combination of electrospinning, carbonization, and subsequent nitridation. After undergoing the nitriding treatment, the emergency of Fe 4 N with superior electromagnetic properties, the introduction of more defects and functional groups, and the synergistic effect between each component would dramatically intensify multiple loss mechanisms, optimize the impedance matching, and improve the wave absorbing properties. Ultimately, the ternary fibrous nanocomposite realized the minimum reflection loss of −63.7 dB at 12.5 GHz with corresponding matching thickness of 2.2 mm, and an ultrabroad bandwidth up to 7.0 GHz. Therefore, this work substantiated the promising potential of Fe 4 N in the practical application of microwave absorption, and shed light on the exploitation of a new generation metal nitrides-based wave absorbents.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Fanxu Meng,Jiang Xu,Huiwang Dai,Yunlong Yu,Daohui Lin
Surface modification of microscale Fe powder with nitrogen has emerged recently to improve the reactivity of Fe0 for dechlorination. However, it is unclear how an even incorporation of a crystalline iron nitride phase into Fe0 nanoparticles affects their physicochemical properties and performance, or if Fe0 nanoparticles with a varied nitridation degree will act differently. Here, we synthesized nitridated Fe0 nanoparticles with an even distribution of N via a sol–gel and pyrolysis method. Nitridation expanded the Fe0 lattice and provided the Fe4N species, making the materials more hydrophobic and accelerating the electron transfer, compared to un-nitridated Fe0. These properties well explain their reactivity and selectivity toward trichloroethylene (TCE). The TCE degradation rate by nitridated Fe0 (up to 4.8 × 10–2 L m–2 h–1) was much higher (up to 27-fold) than that by un-nitridated Fe0, depending on the nitridation degree. The materials maintained a high electron efficiency (87–95%) due to the greatly suppressed water reactivity (109–127 times lower than un-nitridated Fe0). Acetylene was accumulated as the major product of TCE dechlorination via β-elimination. These findings suggest that the nitridation of Fe0 nanoparticles can change the materials’ physicochemical properties, providing high reactivity and selectivity toward chlorinated contaminants for in situ groundwater remediation.
研究领域:
环境科学
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）