INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Ruina Li,Xuwen Li,Qingcheng Liu,Hua Yue,Yang Meng,Yuanyuan Tian
With the continuous advancement of fuel cell technology, the exploration and development of highly efficient non - precious - metal catalysts for the oxygen reduction reaction (ORR) have emerged as a focal point of research. Fe–N–C catalysts have attracted much attention due to their excellent performance and low cost, and coupling single-atom catalysts (SACs) with atomic clusters (ACs) is an effective method to improve catalyst activity. This study used the pyrolysis method to synthesize iron atom catalysts (Fe–N–C SACs) and iron cluster coupled catalysts (Fe–N–C SACs/ACs) on ZIF-8 carbon support. It evaluated the catalyst performance through electrochemical testing. The experimental results showed that the introduction of Fe clusters improved the half-wave potential of the catalyst to 0.399 V, which represented an 8.2 % enhancement compared to the SAC catalyst and reached 87.1 % of that of the commercial Pt–C catalyst, and reduced the Tafel slope to 61.47 mV dec −1 , effectively improving the ORR activity of the catalyst. We constructed FeN 4 single atom catalyst models and FeN 4 /Fe 4 N 6 single atom cluster catalyst models using density functional theory (DFT), analyzed their electronic structures and reaction mechanisms, and revealed the mechanism of action of iron clusters. DFT calculations showed that iron clusters altered the charge distribution of FeN 4 sites, reducing the rate determining step (RDS) (OH desorption) energy to 0.5 eV, which promoted the desorption of products and the re-adsorption of reactants. As a result, the superior electrocatalytic performance of Fe–N–C SAC/AC is attributed to the synergistic effect between iron clusters and single atoms, which is influenced by the coordination environment and provides new ideas for designing efficient ORR catalysts.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2025
·
IF 3
Qi Li,Zhangqiao Zhou,Yan Nie,Lu Yang,Yu Wang,Jinsong Chen,Xian Wang
The preparation of soft magnetic composites requires effective surface modification of alloy powder to enhance insulating properties and achieve dense, uniform coating layers. Firstly, the gas-atomized Fe-Ni-Mo powder was surface modified using the atomic layer deposition method, forming a uniform and dense Al 2 O 3 insulating layer. The secondary surface modification of organic polymers further improves the properties of soft magnetic composites. This study systematically evaluates the effects of the primary and secondary surface modification on the properties of powder particles and soft magnetic composites. The primary modification generates an extremely thin insulating layer of approximately 2.5 nm, which increases the particle resistivity by 9 orders of magnitude. The permeability frequency stability of the soft magnetic composites increased from 11.3 % to 96.5 %, resulting in significant core loss reduction. The secondary modification effectively enhances the formability of soft magnetic composites. Optimal permeability of 242.7 at 1 kHz is achieved, maintaining 95.2 % frequency stability up to 1 MHz, while core loss remains below 570 mW cm −3 under 100 kHz/100 mT conditions. The surface treatment method in this work can provide a reference for the surface insulation modification of soft magnetic composites.
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Journal of Materials Chemistry B
·
2025
·
IF 5.7
Jiale Zhang,Pengtao Chen,Jinlong Hu,Shuqing Wu,Yue Lin,Yao Lu,Junyu Xia,Jingcheng Wang,Jie Li,Yuan Liang
Implant-related infections (IRIs) pose a major challenge in orthopedic applications due to the persistence of biofilms, which are highly resistant to conventional antibiotics. This study introduces oxygen vacancy-engineered Zn–Fe spinel nanoparticles as microwave-responsive antibacterial agents. The oxygen vacancies in the spinel structure enhance reactive oxygen species (ROS) generation under microwave irradiation, providing a dual-mode antibacterial mechanism of thermal and oxidative stress. Zn–Fe spinel nanoparticles were synthesized using a sol–gel method and evaluated for their antibacterial efficacy against Staphylococcus aureus biofilms. Under microwave irradiation, the Zn–Fe spinel demonstrated significant biofilm disruption and bacterial eradication. Mechanistic studies revealed that oxygen vacancies promoted ROS generation, leading to bacterial membrane damage. In vivo experiments using a mouse infection model confirmed the material's antibacterial efficacy and biocompatibility, with no observed toxicity. This study highlights the potential of oxygen vacancy-enhanced Zn–Fe spinel as a microwave-assisted, antibiotic-free strategy for treating deep-seated infections associated with orthopedic implants.
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PubMed
高影响因子
Surfaces
·
2025
·Vol. 8
·期 3
·60
·
IF 2.9
Yanying Zhu,Yanxiang Wang,Jianwei Zhang,Jinghe Guo,Yingfan Li,Siao Xin,Ziyi Xu,Yanru Yuan,Dong Zhang
Surface modification of carbon fibers (CFs) is a critical step in preparing carbon fiber-reinforced composites. This study developed a continuous experimental process that integrates electrochemical anodic oxidation and chemical vapor deposition to fabricate carbon nanotubes/carbon fiber (CNTs/CF) reinforcements. The effects of temperature and hydrogen flow rate during CNT growth on the resulting reinforcements were systematically investigated. The surface morphology and mechanical properties of the modified materials were characterized using scanning electron microscopy, Raman spectroscopy, and single-fiber tensile testing. Employing an Fe0.5Ni0.5bimetallic catalyst under optimized conditions (550 °C, H2flow rate: 0.45 mol/min, C2H2flow rate: 0.30 mol/min), the resulting reinforcement exhibited an 8.7% increase in tensile strength compared to as-received CF.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 3
·196
·
IF 2.8
Zhao Xinyue,Zhang Xijun,Gao Chenyu,Wang Peng,He Yan,Chu Dianming,Bai Wenjuan
Carbon nanotubes (CNT) have attracted much attention due to their wide range of applications, but the complex and time-consuming preparation of CNT by the traditional chemical vapor deposition (CVD) method has limited their large-scale production. In this study, we propose an innovative “one-step” CNT growth process to simplify catalyst preparation. The significant advantage of this method is that it reduces the time consumption by 90% compared with other catalyst preparation methods. Aluminum foil was found to outperform other materials as a substrate and catalyst loading significantly affected the morphology and quality of CNT. High-density, low-defect, high-crystallinity, and high-quality CNT could be grown on aluminum foil at the optimal loading (e.g., 0.10 mol/L.) In addition, the growth of CNT is affected synergistically by catalyst-substrate interfacial interactions, temperature, and aqueous solution content. In particular, CNT arrays with a diameter of 20 nm were successfully prepared on an iron catalyst calcined at 660 °C. These findings are important for large-scale, low-cost production of high-quality CNT.
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Catalysts
·
2025
·Vol. 15
·期 12
·1105
·
IF 4
Xin Wang,Longxue Yu,Shuo Wang,Lingyun Xue,Yi Liu,Zhuhui Qiao,Xunyong Liu
Tetracycline (TC) is chemically stable and recalcitrant to natural degradation. Peroxymonosulfate (PMS)-based advanced oxidation processes offer an effective removal strategy, the efficacy of which relies on high-performance heterogeneous catalysts. Titanium dioxide (TiO2) is an ideal material due to its stability and environmental compatibility, yet its practical application is hindered by inadequate PMS activation capacity, particle agglomeration, and difficult recovery. To address these limitations, a heterogeneous Fe/TiO2catalyst was constructed via Fe3+doping, innovatively utilizing polyvinylpyrrolidone (PVP) as a structure-directing agent. PVP’s steric hindrance effectively suppressed nanoparticle agglomeration and enabled high dispersion of Fe active sites, simultaneously enhancing catalytic activity and stability. Under optimized conditions, the Fe/TiO2/PMS system achieved 94.3% TC degradation, following pseudo-first-order kinetics and significantly outperforming pure TiO2used in this experimental system. Radical quenching verified sulfate radicals (SO4•−) as the dominant species. The catalyst demonstrated excellent recyclability, retaining over 80% degradation efficiency after six cycles and enabling convenient magnetic separation. Moreover, in complex water matrices (tap water and seawater), it sustained high removal efficiency (>90% initially, >70% after six cycles), highlighting its superior anti-interference capability and practical potential. This work offers a strategic material design strategy for efficient and robust TC removal in challenging water environments.
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Fuel Cells
·
2022
·
IF 2.948
Yanqi Hao,Lin Ge,Siew Hwa Chan
Looking for non-noble metal catalysts with low cost, high activity, and high stability to replace platinum in oxygen reduction reaction (ORR) has aroused great concern. According to previous studies, Fe-N x /C material is one of the most promising non-noble metal catalysts for ORR. In this study, new Fe-N x /C material was synthesized by introducing CeO 2 and Fe 3 O 4 nanoparticles into a Fe-N x /C material derived from ZIF-8 as precursors. The new material was called CeO 2 -Fe 3 O 4 @Fe-N/C catalyst and the activity of the catalyst was found to be significantly improved in 0.1 mol L −1 KOH. The half-wave potential of CeO 2 -Fe 3 O 4 @Fe-N/C (0.892 V) is higher than that of Pt/C by 67 mV. In the stability test, the half-wave potential of CeO 2 -Fe 3 O 4 @Fe-N/C was only reduced by 4 mV after 5,000 cycles. The high performance is attributed to the introduction of CeO 2 and Fe 3 O 4 , which gives CeO 2 -Fe 3 O 4 @Fe-N/C enhanced electrocatalytic activity and long-term stability. This approach makes CeO 2 -Fe 3 O 4 @Fe-N/C a promising candidate for cathode catalysts in renewable energy conversion devices.
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高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 40
·15121-15126
·
IF 4.052
Yu Kuai,Weijun Li,Yujie Dong,Wai-Yeung Wong,Shuanma Yan,Yuyu Dai,Cheng Zhang
A metal complex nanosheet was synthesized by the liquid–liquid interface self-assembly method from a star-shaped ligand of tris[4-(4′-2,2′:6′,2′′-terpyridyl)-phenyl]amine in organic solvents and metal ion Fe(II) in water solution. The as-prepared nanosheet possessed excessively smooth morphology with a thickness of hundreds of nanometers. Adhering to an ITO glass, the nanosheet showed noticeable electrochromism from purplish red at 0 V to orange-yellow at 1.4 V and green at 1.6 V. Besides, the nanosheet exhibited outstanding stability with the optical contrast maintained at almost 100% of its original electrochemical activity over 500 cycles. The liquid–liquid interface self-assembly method was proven to be promising to prepare a polymeric metal complex for potential electrochromic applications.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2023
·Vol. 25
·期 8
·1-10
·
IF 2.5
Cui Wei,Fang Jiahui,Wan Yuanyuan,Tao Xueyu,Guo Litong,Feng Qiyan
In this study, Fe–N co-doped carbon nanotubes (Fe–N-CNTs) were prepared and used to activate peroxymonosulfate (PMS) for advanced oxidation removal of Rhodamine B (RhB). The XRD, XPS, SEM and EDS results revealed that the Fe, N, O co-doped carbon nanotubes (Fe–N-CNTS) coated with FeO(OH) nanosheets were successfully synthesized by a simple pyrolyzing process. The large BET specific surface area (286.42 m 2 /g) and hybrid pore structure of micropores and mesopores (3–10 nm) of the Fe–N-CNTS ensured its good RhB degradation performance (98% in 30 min) by activatting PMS. The Fe–N-CNTS-1.5 had the best degradation performance, which could be attributed to the synergy effect between FeO(OH) nanosheets and Fe–N-CNTS. The 1 O 2 , O 2 •, •OH and SO 4 −• were formed during the PMS activating process and involved in the RhB degradation. The reaction constant of 0.5483 min −1 could be obtained by adding 1.5 mM PMS, which is about 12 and 24 times of the reaction constant of PMS only (0.0458 min −1 ) and FeN-CNTS only (0.0226 min −1 ), respectively. This work provides new insight into the mechanism of PMS activation by carbon-based catalysts for the efficient degradation of RhB.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Lulu Zheng,Siyu Gao,Shuaikang Yao,Yingjie Huang,Shangru Zhai,Jingai Hao,Xuemei Fu,Qingda An,Zuoyi Xiao
The development of novel materials for electrodes with high energy densities is essential to the advancement of energy storage technologies. In this study, N -doped layered porous carbon with ZIF-67-derived binary CoFe 2 O 4 -Fe particles was successfully fabricated by the pyrolysis of an Fe-based chitosan (CS) hydrogel mixed with ZIF-67 particles. Various characterization techniques were employed to assess the performance of the prepared porous CoFe 2 O 4 -Fe@NC composite. This composite exhibits excellent performance owing to the effective combination of multivalent CoFe 2 O 4 -Fe particles derived from ZIF-67 with N -doped porous carbon substances with a high surface area, which helps to accelerate ion and charge transfer. The specific capacitance of the CoFe 2 O 4 -Fe@NC composite carbonized at 700 °C reached 3960.9F/g at 1 A/g. When this composite is combined with activated carbon (AC) to construct an asymmetric supercapacitor (ASC), a density of energy of up to 84.9 W h kg −1 is attained at a power capacity of 291.6 W kg −1 . Moreover, this composite maintained a capacitance retention of up to 94.9 % after 10,000 cycles. This work offers new perspectives on high-performance supercapacitors and their applications.
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FIBERS AND POLYMERS
·
2022
·Vol. 23
·期 10
·2809-2819
·
IF 2.347
Yang Yuhui,Chen Hongbin,Zhang Ruquan,Huang Jingjing,Bai Zhikui,Xiao Shili
The ferric ions sludge produced during pollutants degradation was an obstacle for large scale application of Fenton oxidation technology. Herein, we reported a facile method using 2,2,6,6-tetramethylpiperidine-1-oxygen radical (TEMPO)-oxidized cotton fabric as a substrate for anchoring Fe(II) ions to produce Fe(II)-anchored cotton fabric. The formation of Fe(II)-anchored cotton fabric was confirmed using EDS analysis and FTIR measurement. Bath experiments indicated that Fe(II)-anchored cotton fabric could Fenton oxidize rhodamine B (RhB) dye in a high efficient rate (95.9 %) within 60 min without second pollution. Fe(II)-anchored cotton could be reused without any physical/chemical treatment and its decolorization efficiency was retained at 89.9 % even after the third cycle. Moreover, the decolorization behavior of Fe(II)-anchored cotton fabric for the RhB solution was affected by H 2 O 2 dosage, Fe(II) ion content, and inorganic salts. Kinetic study indicated that the RhB decolorization process fits a pseudo-first order well and the sorption isotherm assessment revealed that the reactive sorption of RhB dye on Fe(II)-anchored cotton fabric fits the Freundlich model.
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高影响因子
Nano Research
·
2024
·
IF 9.5
Liu Dong-Xue,Deng Xin,Zhu Yong-Fu,Meng Zhe,Sun Xue-Feng,Shi Miao-Miao,Zhong Hai-Xia,Yan Jun-Min
Electrocatalytic reduction of nitrate \(({\rm{N}}{{\rm{O}}_3}^ - )\) and nitride \(({\rm{N}}{{\rm{O}}_2}^ - )\) to ammonia (NH 3 ) is of wide interest as a promising alternative to the energy-intensive Haber-Bosch route for mitigating the vast energy consumption and the accompanied carbon dioxide emission, as well as benefiting for the relevant sewage treatment. However, exploring an efficient and low-cost catalyst with high atomic utilization that can effectively facilitate the slow multi-electron transfer process remains a grand challenge. Herein, we present an efficient hydrogenation of \({\rm{N}}{{\rm{O}}_3}^ - /{\rm{N}}{{\rm{O}}_2}^ - \) species to NH 3 in both alkaline and neutral environments over the Fe 2 (MoO 4 ) 3 derived hybrid electrocatalyst with the metallic Fe site on FeMoO 4 (Fe/FeMoO 4 ). The Mo ingredient can play a synergistically positive role in further promoting the NH 3 production on Fe. As a result, Fe/FeMoO 4 behaves well in the electrochemical NH 3 generation from \({\rm{N}}{{\rm{O}}_2}^ - \) with a maximum NH 3 Faradaic efficiency (FE) of 96.53% and 87.68% in alkaline and neutral electrolyte, corresponding to the NH 3 yield rate of 640.68 and 302.56 \({\rm{mg}} \cdot {{\rm{h}}^{ - 1}} \cdot {\rm{m}}{{\rm{g}}_{{\rm{cat}}.}}^{ - 1}\) , respectively, which outperforms the Fe and Mo counterpart and other similar catalyst, showing the robust catalytic capacity of each active site.
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