JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2024
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IF 2.5
Chunwei Leng,G. Yang,Quanmin Xie,Yidi Li,Jun Yang,E. Ranjith Kumar
In this work, a highly-dense cementite (Fe 3 C) was synthesized via ultra-high pressure method (UHPM). Different raw batches were prepared under identical synthetic conditions (1000 °C and 4.0 GPa for 10 min). Large amounts of Fe 3 C were produced from the raw material consisting of ∼ 6 µm iron powder with ∼ 1.5 µm graphite, illustrating that the particle size and carbon source are critical for synthesizing Fe 3 C via UHPM. The crystal size of the synthesized Fe 3 C was estimated to be approximately 19 nm by peak broadening of the X-ray diffraction pattern. Additionally, the synthesis of Fe 3 C was confirmed by electron probe microanalysis analyzer (EPMA) and X-ray photoelectron spectroscopy (XPS). Scanning electron microscopy (SEM) images showed clearly shaped grain boundaries. The excellent mechanical properties of the prepared Fe 3 C were confirmed based on an ultrasonic pulse reflecting method. According to the magnetic-hysteresis loop of the Fe 3 C, it displayed soft ferromagnetic properties.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·11970-11983
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IF 3.553
Niu Yingchun,Li Xueai,Dong Wenqi,Zhang Can,Zhao Kuihu,Wang Fengyan,Wang Haiyan
Carbon and iron composites have drawn much attention for their unique electromagnetic properties. In addition, nitrogen doping of carbon can effectively modulate the dielectric properties of carbon. Therefore, synthesis of N-doped carbon and iron composites is an alternative method for obtaining high-efficiency microwave absorption materials. In previous studies, the synthesis process was very complicated including multistep routes. In this work, N-doped carbon with embedded Fe/Fe 3 C was synthesized in-situ via pyrolysis of amino phenol formaldehyde resin (APF) scattered with Fe 2 O 3 nanoparticles (APF/Fe 2 O 3 ), which was obtained through a simple hydrothermal process. During the heat-treatment process, the APF resin was converted into N-doped carbon, and simultaneously, the Fe 2 O 3 was reduced to iron nanoparticles. Then, inevitably, the iron nanoparticles reacted with carbon to form Fe 3 C at the interface between the iron particles and carbon. Taking advantage of multiple heterogenous interface, the interfacial polarization relaxation could be enhanced. Therefore, the N-doped carbon with embedded Fe/Fe 3 C particles displays microwave absorption with a maximum reflection loss of − 70 dB. Moreover, the effective absorption bandwidth (reflection loss of less than − 10 dB) reaches 6.02 GHz at a thickness of 2.13 mm. This study not only provides composites of N-doped carbon with embedded Fe/Fe 3 C particles with excellent stable microwave absorption but also offers a simple method for synthesizing N-doped carbon with embedded Fe/Fe 3 C particles.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
RSC Advances
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2022
·Vol. 12
·期 13
·7935-7940
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IF 4.036
Aoping Guo,Xiaobao Zhang,Baiyi Shao,Song Sang,Xiaojing Yang
We report an environmentally friendly strategy for the synthesis of Fe3C/Fe/graphitic carbon based on hydrothermal carbonization and graphitization of carbon spheres with potassium ferrate (K2FeO4) at 800 °C. The obtained sample consisting of Fe3C/Fe nanoparticles and graphitic carbon (FC-1-8) delivered an enhanced pseudocapacitance of 428.0 F g−1 at a current density of 1 A g−1. After removal of the Fe3C/Fe electroactive materials, the graphitic carbon (FC-1-8-HCl) possessed a large specific surface area (SSA) up to 2813.6 m2 g−1 with a capacity of 243.3 F g−1 at 1 A g−1, far outweighing the other amorphous carbon electrodes of FC-0-8 (carbon spheres annealed at 800 °C without the treatment of K2FeO4). The graphitic material with a porous structure could offer more electroactive sites and improved conductivity of the sample. This method provided guidelines for the synthesis of superior performance supercapacitors with synchronous graphitic carbon and electroactive species.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hongai Zheng,Xiqian Zheng,Meilin Zhu,Cunzheng Xiao,Mengyao Li,Daquan Zhang,Lizhi Zhang
Modification of membranes is an effective method for degrading organic pollutants and alleviating membrane fouling. In this study, CuO-Fe 3 C-C catalyst was prepared by high-temperature pyrolysis. The membrane modified by CuO- Fe 3 C-C was prepared by vacuum filtration. The bacteriostatic rate of the modified membrane can reach to 96.8 %. Compared to the pristine membrane, the pure water flux of the modified membrane increased from 223.43 L m −2 h −1 bar −1 to 422.27 L m −2 h −1 bar −1 , the flux recovery ratio (FRR) of modified membranes increased from 39.7 % to 79.25 %. Removal rate of TC (Tetracycline) by modified membrane activated PMS can reach to 90.75 %. After 5 cycles, the degradation efficiency of modified membranes was still 83.77 %, which was only 6.39 % lower than that of the first cycle. Free radical quenching experiments and ESR tests explored the possible catalysis and antifouling mechanisms of the modified membrane system, the results showed main active species were SO 4 − •, OH•, O 2 − • and 1 O 2 . This study prepared membranes with excellent antifouling properties, providing a theoretical reference for alleviating membrane fouling in membrane-based water treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Catalysts
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2022
·Vol. 12
·期 10
·1140
·
IF 4.501
Wei Zhang,Caiping Ma,Xingwu Liu,Yong Yang,Yongwang Li,Xiaodong Wen
Elucidation of the intrinsic catalytic principle of iron carbides remains a substantial challenge in iron-catalyzed Fischer-Tropsch synthesis (FTS), due to possible interference from other Fe-containing species. Here, we propose a facile approach to synthesize single-phase θ-Fe3C via the pyrolysis of a molecularly defined Fe-C complex (Fe4[Fe(CN)6]3), thus affording close examination of its catalytic behavior during FTS. The crystal structure of prepared θ-Fe3C is unambiguously verified by combined XRD and MES measurement, demonstrating its single-phase nature. Strikingly, single-phase θ-Fe3C exhibited excellent selectivity to light olefins (77.8%) in the C2-C4hydrocarbons with less than 10% CO2formation in typical FTS conditions. This strategy further succeeds with promotion of Mn, evident for its wide-ranging compatibility for the promising industrial development of catalysts. This work offers a facile approach for oriented preparation of single-phase θ-Fe3C and provides an in-depth understanding of its intrinsic catalytic performance in FTS.Keywords:θ-Fe3C;single phase;Fischer-Tropsch synthesis;Prussian blue analogue
研究领域:
催化
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
ACS ES&T Engineering
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2022
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IF 0
Ting Zhang,Zhelun Pan,Dinggui Song,Hong Huang,Jiang Yu,Yichan Wen,Junlin Lu,Zhenfeng Bian,Xufang Qian
The high reactivity of Fe(0) with Cr(VI) makes it the best choice for Cr(VI) removal. Interstitial compound Fe3C was produced during the carbothermic reduction of mesoporous phenolic resin/ferric ions to form Fe(0)/Fe3C nanoparticles embedded in mesoporous carbon (Fe(0)/Fe3C@MesoC). Fe3C accelerates the electrochemical corrosion process of α-Fe(0) in solution, and the positive/negative equipotential interface that is formed by iron–carbon (Fe–C) microelectrolysis of Fe(0)/Fe3C@MesoC induces the capture of Cr(VI) anions and Cr(III) cations as a result of this process. Cr(VI) was completely reduced to Cr(III) by the Fe(0)/Fe3C@MesoC catalyst with a high electron efficiency (40.5%) relative to nanosized zero-valent iron (1.9%) and Fe@MesoC (32.7%). Surface ferrous ions are the principal reactive species responsible for Cr(VI) reduction (at least 64%); Fe(0)/Fe3C and undetectable surface ferrous ions account for a small part of Cr(VI) reduction (around 28%), and only 8% of Cr(VI) ions are reduced by active hydrogen (H*). The proposed structure of Fe(0)/Fe3C@MesoC provides new insight into iron–carbon material preparation and application in in situ chemical reduction.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
ACS Applied Nano Materials
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2020
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IF 0
Shichuan Su,Long Huang,Shan Su,Chunfeng Meng,Hu Zhou,Liuting Zhang,Ting Bian,Aihua Yuan
The construction of active and durable electrocatalysts based on a high abundance of elements toward oxygen reduction reaction (ORR) is critical for proton-exchange membrane fuel cells and metal–air batteries. Here, a composite nanostructure composed of Fe/Fe3C-NC nanosheets and carbon nanotubes (G-Fe/Fe3C-NC/CNTs) was designed by simply annealing a glucose-chelated Fe-coordinated metal–organic frameworks. The introduction of glucose can not only effectively prevent the collapse of the initial two-dimensional (2D) leaflike zeolitic imidazolate frameworks (ZIFs) during the carbonization process but also boost the growth of carbon nanotubes (CNTs). Benefiting from efficient Fe/Fe3C and Fe–Nx moieties, high specific surface area, and electron-conducting highways provided by the unique composite structure, the obtained G-Fe/Fe3C-NC/CNTs electrocatalysts achieved an impressive ORR activity with a higher positive onset potential of 1.02 V and half-wave potential of 0.87 V over the commercial Pt/C. Significantly, it also exhibits outstanding stability after 6000 cyclic voltammogram (CV) cycles with nearly negligible decay in half-wave potential, which makes it one of the promising Pt-free catalysts for ORR.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
DIAMOND AND RELATED MATERIALS
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2024
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IF 4.3
Shijiang Feng,Rong Qiang,Yulong Shao,Xiao Yang,Rui Xue,Qian Ma,Fangjie Ren,Yuancheng Ding,Xu Wu,Lei Rong,Jingbo Fang,Caihong Chen,Yiheng Zhang
The rapid development of communication technology has led to severe microwave pollution, which presents a challenge for microwave-absorbing composites. Current research suggests achieving superior microwave absorption requires the use of multi-component operation and ingenious structural design. Consequently, the present study has prepared continuous porous carbon (CPC) materials doped with large amounts of Fe 3 C/Fe nanoparticles (Fe@CPC) using carbonization and acid etching. By balancing the advantages of the above strategies, it is possible to address issues such as poor impedance match, single loss capacity, easy oxidation of magnetic metals/alloys, and the limited absorption bandwidth of conventional absorbing materials at the same time. The material exhibits a minimum reflection loss of −23.2 dB with an efficient absorption range of 5.3 GHz at 1.9 mm at a filler content of just 10 wt% in the paraffin matrix. In this paper, the samples with a continuous porous structure were prepared by a simple method, and the properties were excellent due to the appropriate preparation method and the synergistic effect of the multi-component composite. The porous structure facilitates the presence of a considerable number of active sites, which enables the loading of a substantial quantity of metal ions. Furthermore, nanoparticles are capable of aggregating and dispersing on the surface. This paper presents a theoretical framework for understanding the synergistic effect of microwave radiation through interfacial polarization and micro-scale magnetic interaction. Nevertheless, there are still obstacles to overcome in terms of achieving precise control over the structural design and ensuring the compatible integration of metal components.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Rundong Guo,Dong Su,Fu Chen,Yongzhi Cheng,Xian Wang,Rongzhou Gong,Hui Luo
Microwave-absorbing materials have attracted enormous attention for electromagnetic (EM) pollution. Herein, hollow beaded Fe3C/N-doped carbon fibers (Fe3C/NCFs) were synthesized through convenient electrospinning and subsequent thermal treatment. The special hollow morphology of the samples is conducive to achieve lightweight and broadband microwave absorption properties. The thermal treatment temperatures exhibit a significant impact on conductivity and EM properties. The broadest effective absorption bandwidth (EAB) is 5.28 GHz at 2.16 mm when the thermal treatment temperature is 700 °C, and the EAB can cover 13.13 GHz with a tunable absorber thickness from 1.0 to 3.5 mm when the thermal treatment temperature is 750 °C. The excellent microwave absorption properties of the samples are due to the synergistic effect of impedance matching and strong EM energy attenuation abilities. Hence, the magnetic hollow beaded Fe3C/NCFs are expected to be an attractive candidate material as a lightweight and efficient microwave absorber in the future.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Wenhui Tian,Penggang Ren,Xin Hou,Runzhuo Xue,Zhengyan Chen,Zhengzheng Guo,Yanling Jin,Fang Ren
As the most attractive electrode for supercapacitors , renewable carbon-based material exhibits slow charge and discharge ability and low volumetric energy density , severely hindering its extended applications. Herein, a neotype and high-performance carbon-based nanocomposites were successfully prepared from Linum usitatissimum . L stems assisted with K 4 Fe(CN) 6 ·3H 2 O through a green and straightforward high-temperature treatment method. Benefiting from the activation and decomposition of K 4 Fe(CN) 6 ·3H 2 O, the carbon-based nanocomposite decorated by Fe 3 C and Fe 3 O 4 possesses moderate porous volume, heteroatoms content, and graphitization degree. These characteristics endow the supercapacitor assembled from as-prepared carbon-based nanocomposite with fast charge/discharge ability, high volumetric capacitance (303.8 F cm −3 , 1 A g −1 ), excellent rate performance (61.3%, 100 A g −1 ), and outstanding cycle life. Owing to abundant N/O-containing functional groups, high C=C content, and appropriate specific surface area , the resultant nanocomposite also exhibits excellent organic dye removal performance. Overall, this work offers a green and efficient avenue for designing multi-doped carbon-based nanocomposites in electrochemical energy storage and organic dye removal.
研究领域:
材料科学
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电化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Guofu Ma,Xuan Xie,Kanjun Sun,Hui Peng,Shuzhen Cui,Xiaozhong Zhou,Qintao Wang,Ziqiang Lei
Novel Fe 3 C nanoparticles that decorate three-dimensional N-rich porous carbon (Fe 3 C@3DNC) catalysts were designed and synthesized by double templates assisted high-energy ball milling and subsequent high-temperature pyrolysis for the oxygen reduction reaction (ORR). NaCl and Na 2 SiO 3 are used as the mixed template while Fe(NO 3 ) 3 ·9H 2 O and 2-Methylimidazole were used as the iron, nitrogen and carbon sources. The optimized Fe 3 C@3DNC catalyst (Fe 3 C@3DNC-1-900) had good ORR performance in alkaline medium , with an Eonest value of 0.968 V and E 1/2 value of 0.861. In addition, the catalytic process exhibited selectivity–nearly four-electron transfer kinetics and possesses a lower Tafel slope compared to commercial Pt/C catalyst as well as good methanol tolerance. In addition, the Fe 3 C@3DNC-1-900 catalyst also had excellent ORR activity (E 1/2 = 0.72 V) and long-term stability (the half-wave potential only occurs at 10 mV after 5000 cycles) in acidic media. The good catalytic performance of the Fe 3 C@3DNC-1-900 catalyst can be attributed to the 3D hierarchically porous structure and extremely high number of active sites around the porous carbon. The double template assisted high-energy ball milling strategy can be a promising and scalable method to prepare three-dimensional porous carbon-based composite materials for energy conversion and storage applications.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yong Xu,Shi Chen,Mingfu Ye,Mingyue Wang,Wenhai Wang,Konglin Wu
Levodopa (LDA) is a principal medication for the treatment of Parkinson’s disease, with its therapeutic efficacy and potential side effects being closely associated with administered dosages. Consequently, the development of sophisticated LDA detection methods is of significant importance. Herein, we present the successful fabrication of an innovative electrochemical sensor utilizing Fe/Fe 3 C nanoparticles supported on activated N-doped carbon spheres (Fe/Fe 3 C-ANC), which makes full use of the large specific area of ANC to accommodate more dispersive Fe/Fe 3 C NPs that exhibits outstanding electrocatalytic activity for LDA oxidation. The experimental findings demonstrate that Fe/Fe 3 C-ANC sensor can deliver wide linear response ranges (1–40 µM) with an impressively low limit of detection of 0.22 µM, surpassing the performance of most previously reported electrochemical sensors. Additionally, the good selectivity of Fe/Fe 3 C-ANC sensor was also proved through measuring a series of LDA structural analogues and potential interfering substances. Furthermore, its excellent selectivity was confirmed through the analysis of LDA structural analogs and potential interferents. The practical utility of the sensor was evaluated by detecting LDA in commercial tablets, spiked human serum and spiked artificial cerebrospinal fluid samples.
研究领域:
医学
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材料科学
·
分析化学
✓ 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）