CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Yutian Cai,Runyang Zhou,Shanshan Zhang,Mengke Qiao,Yongzhi Cheng,Yingli Zhu,Hui Luo,Pingan Chen,Xiangcheng Li,Fu Chen
MOFs-derived magnetic carbon-based composites exhibit great application potentials in electromagnetic absorption field. Nowadays, the MOF-on-MOF hybrid materials, constructed by self-assembly of two or more MOFs, gradually become the prevailing precursors for efficient microwave absorbers due to the flexible structure and component design which are beneficial to improving microwave attenuation and optimizing impedance matching. Herein, the binary MOF-on-MOF hybrid templates MIL-88A@ZIF-67 has been fabricated based on a surfactant-assisted growth strategy, and subsequently thermally converted into the spindle-like Co 3 Fe 7 @NC/magnetic MWCNTs composites (CFM) through a DCDA-assisted carbothermal reduction method. It has been revealed that the carbothermal temperature could not only regulate the crystallinity of Co 3 Fe 7 alloys and magnetism of CFM composites, but also make significant impact on chemical and mesoscopic structure of conductively hierarchical architecture composed by surficial MWCNTs and pyrolytic carbon derived from various ligands of different MOFs. Among the three proposed absorbers in this work, the CFM-700 sample with densest surficial magnetic MWCNTs achieved a satisfied balance between intrinsic microwave consumption and impedance matching due to the magnetic-dielectric synergistic effect. The reflection loss of CFM-700 could keep staying below −20 dB in an ultra-wide range from 3.6 GHz to 18.0 GHz when the thickness varies from 1.3 mm to 5.45 mm. Moreover, the minimum reflection loss of CFM-700 is −68.75 dB at 1.88 mm and the effective absorbing bandwidth could reach 4.72 GHz at only 1.55 mm. It is believed that this work paves an inspiring way to design conductively hierarchical magnetic carbon-based composites with excellent microwave absorption through construction of MOF-on-MOF hybrid structures.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Pengfei Yin,Yuting Tang,Limin Zhang,Sihan Liu,Jian Wang,Yi Zhang,Xiyuan Sun,Zhihua Gao,Haipeng Hu,Yongpeng Zhao
Preparation of microwave absorption materials is one of the most effective way to solve hazards of excessive microwave radiation at current stage. Herein, a series of pyramid-like carbon frameworks embedded with Co 3 Fe 7 and CoFe 2 O 4 phases have been synthesized via a solvent-controlled strategy in solvothermal-annealing process. The solvent ratio of DMF and DW has great impact on the morphology and electromagnetic wave dissipation properties of such composites. The composite can reach the maximal RL of −24.66 dB at 7.68 GHz and the optimal EAB of 6.3 GHz for only 2.62 mm, this realization of wider EAB at thin thickness is due to the synergic effect of dielectric polarization, magnetic resonance, structural damping and so on. Most important of all, the wide range of appropriate impedance matching in as-prepared composite is the first premise. The broad EAB of composite prepared here reveals its prospect for actual application in protection of microwave radiation.
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
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
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IF 4.464
Dong Sun,Wen Wang,Bing Liang,Jun Xu,Xiaohui Hu,Qun Yang,Xueqin Zuo,Guang Li,Shaowei Jin
The exploitation of high-efficient yet non-precious counter electrode (CE) materials is of great significance for practical applications of dye-sensitized solar cells (DSSCs). Herein, Co 3 Fe 7 alloy anchored on the porous core-shell CoFe 2 O 4 composites (CoFe 2 O 4 /Co 3 Fe 7 ) were successfully manufactured as a counter electrode for DSSC. The detailed electrochemical measurements verified that the introduction of Co 3 Fe 7 alloys modifies the original core-shell structure, contributing to enhance electrical conductivity and promote interfacial electron transfer. While the porous structure increases the potential for exposing active sites and accelerates the diffusion of iodide ions. Moreover, the formation of hetero-junction facilitates the generation of active facet sharing and multi-component synergy, thus prominently boosting the reduction of triiodide and accelerating reaction kinetics. As a consequence, DSSCs structured with CoFe 2 O 4 /Co 3 Fe 7 -modified CEs achieve a satisfactory power conversion efficiency (PCE) of 8.54%, which surpasses that of conventional platinum (7.70%). Meanwhile, the stability of CoFe 2 O 4 /Co 3 Fe 7 CE is also enhanced than noble metals platinum. This work highlights that the heterogeneous CoFe 2 O 4 /Co 3 Fe 7 with a rich interface can effectively stimulate the catalytic activity of reducing triiodide to enhance the performance of the solar cell. This strategy also paves the way for enhancing material activity in the field of energy storage and conversion.
研究领域:
材料科学
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电化学
·
太阳能
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产品关联
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 14
·10884-10895
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IF 4.6
Yanling Wu,Xi Tang,Hui He,Qingyuan Luo,Wenkai Fu,Qinggao Hou,Haijun Zhang
Developing high-performance, multifunctional non-precious metal catalysts is essential for enhancing the efficiency of future energy utilization. In this study, four types of magnetic, recyclable Co3Fe7/CoFe2O4 incorporated porous carbon composite catalysts were synthesized using citric acid as the carbon source and ammonium chloride (NH4Cl) as the salt medium. Iron and cobalt salts, in four different proportions, were uniformly incorporated using freeze-drying technology and subsequently processed through in situ calcination. Among the synthesized catalysts, Co3Fe7/CoFe2O4@NC-1, demonstrated outstanding catalytic reduction performance, with a reaction rate constant (k) of 0.031 min−1, along with excellent cycle stability for 4-NP. The resulting Co3Fe7/CoFe2O4@NC-3 catalyst exhibited good ORR activity in an alkaline medium (Eonset = 0.99 V, E1/2 = 0.83 V, JL = −5.2 mA cm−2), along with long-term durability and resistance to methanol poisoning. These hybrid materials hold promise as non-precious metal electrocatalysts for fuel cell ORRs and introduce a new class of catalytic candidates for 4-NP reduction.
研究领域:
材料科学
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催化化学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Siyuan Sun,Kexin Wei,Fan Yang,Yang Sun,Junpu An,Yongfeng Li
Carbon-based catalysts with free-standing structure are essential for rechargeable zinc-air battery as electrodes, which can avoid the side effects brought by organic binder. However, the current preparation methods still can be improved for faster preparation process and morphology control. In this study, we reported a fabrication strategy of self-standing carbon catalyst loaded with Co 3 Fe 7 nanoparticles and carbon nanotube as air electrodes for liquid rechargeable zinc-air battery. With a rapidly prepared PAN film used as substrate, ZIF with both Fe and Co elements are loading as active site precursor, which a composite structure of Co 3 Fe 7 nanoparticles and carbon nanotube will form on the free-standing catalyst surface after the carbonization process. In this structure, the carbonated PAN film substrate will provide rich conductive paths to promote electron transfer during the reaction process, and the active sites on the surface can promote the contact between intermediates and active sites. The optimized catalyst FeCo@CP-1:1 has the best ORR/OER bifunctional catalytic activity, which exhibits a halfwave potential (E 1/2 ) of 0.89 V (vs. RHE) for the ORR and a potential of 1.47 V at a current density of 10 mA cm −2 (E 10 ) for the OER. It can be attributed to the excellent ORR catalytic activity of Co 3 Fe 7 nanoparticles and its reconstruction process in OER. Furthermore, FeCo@CP-1:1 exhibits a power density of 154 mW cm −2 and long cyclic stability in liquid ZABs application. This research lays a practical foundation for design and synthesis of free-standing carbon catalyst.
研究领域:
材料科学
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电化学
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纳米技术
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能量存储
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催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Shuhui Wei,Ali Reza Kamali
A mesoporous carbon nanostructure (MCN) with embedded Co 3 Fe 7 /CoFe 2 O 4 magnetic nanoparticles is synthesized by a clean and low-cost ball-milling/molten salt processing approach, employing metal oxides and waste plastic materials, without the involvement of environmentally-problematic raw materials or products. The structure, morphology and magnetic properties of MCN are analyzed by a variety of techniques. A systematic investigation is conducted to evaluate the performance of this nanostructured material as regenerable adsorbent for the efficient removal of methyl orange (MO) and methylene blue (MB) dyes from their aqueous solutions at various conditions, in terms of the dye concentration, the adsorbent dosage and the pH level of the solution. The dye adsorption of MCN is in accordance with the pseudo-second-order kinetic model and the Langmuir isothermal model with an excellent monolayer adsorption capacity of 278 and 238 mg/g for MB and MO, respectively. Moreover, the material is characterized to be ferromagnetic with the Ms value of 17.9 emu/g, ensuring the facile separation of the exhausted adsorbent from the treated water. The adsorption performance of MCN can be regenerated, with an adsorption capacity of greater than 95% of the original performance, after five successive regeneration cycles.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Qian Zhu,Yu Wang,Lei Cao,Lanlan Fan,Feng Gu,Shufen Wang,Shixian Xiong,Yu Gu,Aibing Yu
The rational construction of highly active and robust non-precious metal oxygen reduction electrocatalysts is a vital factor to facilitate commercial applications of Zn-air batteries. In this study, a precise and stable heterostructure , comprised of a coupling of Co 3 Fe 7 and Fe 3 C, was constructed through an interface engineering-induced strategy. The coordination polymerization of the resin with the bimetallic components was meticulously regulated to control the interfacial characteristics of the heterostructure. The synergistic interfacial effects of the heterostructure successfully facilitated electron coupling and rapid charge transfer. Consequently, the optimized CST-FeCo displayed superb oxygen reduction catalytic activity with a positive half-wave potential of 0.855 V vs. RHE. Furthermore, the CST-FeCo air electrode of the liquid zinc-air battery revealed a large specific capacity of 805.6 mAh g Zn -1 , corresponding to a remarkable peak power density of 162.7 mW cm −2 , and a long charge/discharge cycle stability of 220 h, surpassing that of the commercial Pt/C catalyst.
研究领域:
材料科学
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电化学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Shengxi Zhao,Kaiyu Xie,Ali Reza Kamali
A clean and efficient method for synthesizing Co₃Fe₇ intermetallic is reported, based on the water-asisted molten salt electrolysis employing CoFe₂O₄ electrode, which was fabricated through the thermo-mechanochemical treatment of iron and cobalt oxides. The electrolysis is conducted at the cell voltage of 1.5 V, achiving an energy consumption of 1.47 kWh/kg. Upon formation, the synthesized Co3Fe7 serves as an electrode for catalytic hydrogen production, demonstrating a current density of 91.72 mA/cm2. These performances are compared with those of electrolytic Fe (1.49 kWh/kg, 96.45 mA/cm²) and electrolytic Co (1.30 kWh/kg, 40.76 mA/cm²), both prepared under the same electrolysis potential but with different current-time profiles. The electrolytic Co3Fe7 exhibits superior ferromagnetic properties, with saturation magnetization, remanent magnetization and coercivity values of 157.0 emu/g, 4.3 emu/g and 48.9 Oe, respectively, surpassing values reported in the literature for Fe-Co alloys. The findings suggest a sustainable approach for the green synthesis of Co₃Fe₇ with enhanced ferromagnetic properties. Additionally, the electrolytic Fe and Co₃Fe₇ show promise as electrode materials for molten salt hydrogen production.
研究领域:
材料科学
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电化学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Mengzhe Jin,Houqin Wang,Shasha Xu,Zihan Liu,Yunnuo Niu,Ziming Feng,Weidong Liu,Gang Yu,Qingyuan Fang,Qingmin Wang,Rongfeng Huang,Yang Liu
The increasing complexity of electromagnetic environments demands lightweight, broadband, and angle-insensitive electromagnetic wave absorbers. However, achieving a synergistic balance between impedance matching and attenuation capability remains a critical challenge. Herein, we propose a mechanism-oriented design strategy for a lightweight porous metamaterial absorber based on Co₃Fe₇/C nanofibers. By combining dielectric-magnetic material optimization with porous structural engineering, impedance matching and energy dissipation are simultaneously regulated. Simulations show that thickness, pore radius, and porosity critically determine electromagnetic responses. The optimized absorber achieves an effective absorption bandwidth of 6.1 GHz (8.2–14.3 GHz) and a minimum reflection loss of −56.86 dB at 2.5 mm thickness, with robust angle-insensitive performance up to 60°. Mechanistic analysis attributes the superior performance to synergistic coupling of multiple scattering, interfacial polarization, conduction loss, magnetic resonance, and optimized impedance matching. This work provides a universal framework integrating material design with structural engineering for next-generation lightweight electromagnetic wave absorbers.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Chen Liu,Huanxuan Li,Chen Xu,Zijie Shi,Xueheng Wei,Zhitong Yao,Shaodan Xu,Jingang Huang,Mingzhi Huang
The increasing complexity and concentration of refractory organic pollutants in industrial wastewater necessitate the development of efficient and stable advanced oxidation processes (AOPs). Herein, metal–organic framework (MOF)-derived Co₃Fe₇@CN carbon composites were successfully fabricated and evaluated as peroxymonosulfate (PMS) activators for the degradation of oxytetracycline (OTC). Among the as-prepared catalysts, Co₃Fe₇@CN-1 exhibited superior catalytic performance, achieving 90% OTC removal within 10 min with an apparent rate constant ( k obs ) of 0.158 min −1 , which represents a 1.7- and 1.5-fold enhancements over Co₃Fe₇@CN-2 and Co₃Fe₇@CN-3, respectively. The outstanding activity of Co₃Fe₇@CN-1 is primarily attributed to its favorable pore structure and pronounced adsorption–catalysis synergy. Specifically, Co₃Fe₇@CN-1 and Co₃Fe₇@CN-3 achieved 23% and 21% of OTC removal via adsorption, respectively, whereas the dense structure of Co₃Fe₇@CN-2 significantly impeded pollutant uptake (<5%). Mechanistic investigations revealed that PMS activation is driven by the synergistic redox cycling of Co (Co 0 /Co(II)/Co(III)) and Fe (Fe 0 /Fe(II)/Fe(III)) species. Electrons transferred from zero-valent and low-valent metals promote O O bond cleavage in PMS, triggering the generation of SO₄• − and •OH radicals. Crucially, the Fe species acts as an electron reservoir to accelerate the reduction of Co(III) to Co(II), thereby effectively circumventing the rate-limiting step of the Co redox cycle. Simultaneously, high-valent Fe(III)/Co(III) species interact with PMS to form high-valent metal-oxo intermediates ( Fe(IV) O and Co(IV) O), which serve as the predominant reactive species responsible for OTC degradation. The coexistence of radical and non-radical pathways ensures efficient OTC degradation. This work establishes a controllable strategy for constructing MOF-derived carbon catalysts and elucidates the structure–activity relationship between pore architectures and redox centers.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 27
·16863-16876
·
IF 10.7
Katam Srinivas,Hesheng Yu,Zhuo Chen,Anran Chen,Ming-qiang Zhu,Yuanfu Chen,Chengtao Yang
The urgent demand for stable and highly efficient bifunctional electrocatalysts for the oxygen reduction/evolution reactions (ORR/OER) is pivotal in advancing energy conversion and storage technologies. Herein, we introduce a metal–organic framework (MOF)-derived bifunctional electrocatalyst Fe3Co-NC@900, featuring synergistically coupled dual single-atom sites (Fe/Co–Nx) and core–shell Co3Fe7@C nanoparticles. Leveraging the synergistic interactions of Fe–Nx sites with associated Co–Nx sites and core–shell nanoparticles within the MOF-derived nitrogen-doped mesoporous sheets and nanotubes, Fe3Co-NC@900 demonstrates outstanding ORR and OER performance, outpacing the Fe-NC@900 catalyst fabricated without Co incorporation. Specifically, it demonstrates superior ORR performance with a higher half-wave potential (E1/2) of 0.88 V and a small Tafel slope of 62.1 mV dec−1, surpassing the Pt/C benchmark (E1/2 of 0.82 V) and Fe-NC@900 (E1/2 of 0.788 V). Additionally, it demonstrates noteworthy OER performance, requiring a 1.572 V overpotential at 10 mA cm−2 current density, resulting in a significant bifunctional activity with a potential gap (ΔE) of 0.692 V, surpassing the Pt/C + Ir/C combination (ΔE = 0.748 V). Moreover, serving as a bifunctional air electrode, Fe3Co-NC@900 exhibits excellent performance in lab-made Zn–air batteries, with outstanding open circuit voltage, specific capacity, and cycling stability (>650 cycles), outpacing the Pt/C + Ir/C-based battery.
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
危险品化学品经营许可证（带存储）