ACS Applied Nano Materials
·
2020
·
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
·
电化学
✓ 已验证
产品关联
DOI
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
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Yihui Zhou,Jin Qian,Zhe Qiang,Weiqing Kong,Changhuai Ye,Meifang Zhu
Heterogeneous interfaces are crucial for enhancing the polarization loss in composite materials, thereby improving microwave absorption capabilities. However, creating well-defined multiple heterogeneous interfaces essential for optimal absorber performance presents a significant challenge. Herein, Fe/Fe 3 C@C magnetic-carbon composites featuring Fe-Fe 3 C-C multiple heterogeneous interfaces were fabricated through in-situ growth of Fe 3 O 4 on polydopamine nanospheres, followed by thermal reduction and carbonization. Owing to the controllable Fe-Fe 3 C-C multiple heterointerface design, the outer-layer magnetic components not only significantly improve impedance matching but also enhance the interface polarization loss. The optimized Fe/Fe 3 C@C-9–1 composite exhibits excellent microwave absorption performance, achieving a minimum reflection loss (RL min ) of −64.4 dB and a broad effective absorption bandwidth (EAB) of 6.0 GHz at a thin matching thickness of only 1.5 mm, surpassing neat carbon nanospheres and most magnetic-carbon materials. Additionally, simulations conducted using Computer Simulation Technology (CST) demonstrate that the Fe/Fe 3 C@C-9–1 coating significantly reduces radar cross-section (RCS), with values below −20 dB across nearly the entire frequency range of 2–18 GHz, highlighting its potential for radar stealth applications. This work provides a simple yet effective approach for tuning the interface properties of carbon-based materials, underscoring the promise of Fe-Fe 3 C-C multiple heterogeneous interfaces in the development of broadband, thin microwave 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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 15
·14573-14579
·
IF 2.195
Teng Zhen,Zeng Sifan,Feng Wanlin,Zhu Lini,Tan Yongqiang,Han Xiaochun,Chen Chen,Zhang Haibin
Fe-Fe 3 C@C composites are successfully synthesized via a facile pyrolysis process. Experimental results indicate that Fe-Fe 3 C nanoparticles are closely parceled among amorphous carbon and exhibit a core–shell structure. The obtained materials display excellent microwave absorption performance with an optimal reflection loss of − 35.6 dB at 17.2 GHz, and an effective absorbing bandwidth of 4 GHz (from 12.4 to 16.4 GHz) with the coating thickness of 2 mm. The magnetic loss derived from Fe core and dielectric loss on carbon materials as well as a good impedance matching are believed to play decisive roles for this favorable microwave absorbing properties. The composites are considered to be good candidates for microwave absorption applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Jing Li,Junjie Yang,Hui Ren,Xinhui Wang,Yuecheng Xu,Yong Guo,Dan Xiao
In this study, we present an electrochemical sensor with superior sensitivity and selectivity for dopamine (DA) detection. The sensor was created using a nanocomposite of iron-iron carbide nanoparticles decorated with carbon nanotubes (Fe-Fe 3 C@CNTs) to modify a glassy carbon electrode (GCE). The Fe-Fe 3 C@CNTs nanocomposite can be synthesized by a facile microwave-assisted synthesis method with just adopting ferrocene and carbon fiber as raw material and heat source, respectively. The electron microscopy (EM) results indicate that the Fe-Fe 3 C nanoparticles encapsulated with graphitic layer were decorated with CNTs. An investigation of the electrochemical responses of the Fe-Fe 3 C@CNTs/GCE sensor to DA was performed using both cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Notably, in ideal experimental settings, the sensor demonstrated a minimal limit of detection (LOD) of 0.01 μM within a range of linearity from 0.05 to 40 μM, even under a high concentration of uric acid (UA) interference. Moreover, the utility of the produced Fe-Fe 3 C@CNTs/GCE sensor was further validated through successful DA testing in urine samples of human.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Shaowei Jin,Jianfeng Gao,Guang Li,Hui Zhang,Zhaoshun Zhang,Qun Yang,Changcheng Lin,Xueqin Zuo,Shiwei Shi
Solar-driven interfacial evaporation technology has great potential in solving the global challenge of freshwater shortage. However, the selection of excellent photothermal conversion materials is a challenging task. To achieve efficient solar interface evaporation materials, we developed a new material loaded with Fe/Fe3C nanoparticles on mesoporous carbon hollow spheres(MCHS). As an interfacial evaporation material, Fe/Fe3C@MCHS-x has an evaporation rate of 1.633 kg m-2 h-1 and an energy conversion efficiency of 94.17 %(Fe/Fe3C@MCHS-2). The innovative introduction of magnetic particles into the evaporation unit allows the metal nanoparticles to absorb light at their resonance wavelength. This absorption leads to the excitation of electrons from the occupied state to the unoccupied state, and the diffusion of thermoelectron leads to the increase of carriers, which makes the interface temperature rise rapidly. The composite material has a certain degree of organic pollution treatment capability along with high-efficiency water evaporation, which provides new ideas for interfacial evaporation material technology.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Wenqi Dong,Xueai Li,Huimin Tang,Kai Shi,Chunsheng Wang,Wanchun Guo,Kesong Tian,Haiyan Wang
The dielectric-magnetic synergistic effect can be achieved by dielectric relaxation and magnetic resonances in composites of carbon materials and magnetic particles. However, there is no direct evidence demonstrating the distribution of electromagnetic energy attenuation in the microstructure of composites. Herein, an amorphous carbon matrix with dispersed Fe/Fe 3 C@graphite-C was fabricated via a facile route. The distribution of the magnetic vector loss and electric vector loss in the hierarchical structures was revealed by numerical simulation. The content and dispersion of magnetic particles as well as the morphology of the amorphous carbon can be tuned. The 3D amorphous carbon matrix with highly dispersed Fe/Fe 3 C@graphite-C nanoparticles provided the strongest absorption of −69.0 dB and an effective response bandwidth (RL ≤ −10 dB) of 7.06 GHz. The numerical simulation revealed that the magnetic vector loss originated only from the core of Fe/Fe 3 C, and the electric vector loss was distributed throughout the structure, especially in the graphite-C shell, the interface between graphite-C and carbon nanoflakes, and the junction of different carbon nanoflakes. This work not only reveals the distribution of electromagnetic loss but also supports the theoretical analysis of the electromagnetic wave attenuation mechanism in composites, which provides direction for the future design of composites.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2017
·Vol. 5
·期 3
·471-477
·
IF 4.136
Jingchun Jia,Huijuan Yang,Genxiang Wang,Peng Huang,Pingwei Cai,Zhenhai Wen
Graphical All-round activity : Hybrids of Fe/Fe 3 C embedded in N-doped carbon nanotubes (Fe/Fe 3 C@NCNTs) are prepared by pyrolyzing mixtures of Fe 3 O 4 nanoparticles and dicyandiamide. Fe/Fe 3 C@NCNTs show a highly multifunctional catalytic activity for the oxygen evolution, oxygen reduction, and CO 2 reduction reactions. Hybrids of Fe/Fe 3 C embedded in N-doped carbon nanotubes (Fe/Fe 3 C@NCNTs) are prepared by pyrolyzing mixtures of Fe 3 O 4 nanoparticles and dicyandiamide. The systematic electrochemical study of Fe/Fe 3 C@NCNTs shows a decent catalytic activity toward the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR). The sample of Fe/Fe 3 C@NCNTs at 750 °C exhibits a remarkably high activity with an onset potential of 1.47 V for the OER, and an onset potential of 0.96 V and half-wave potential 0.88 V for the ORR, which inspired us to set up a rechargeable Zn-air battery with such Fe/Fe 3 C@NCNT nanohybrids as the cathode materials, showing a maximum power density of 198 mW cm −2 and long-term stability after 500 cycles. We also demonstrate that Fe/Fe 3 C@NCNTs present favorable electrocatalytic activity towards the CO 2 reduction reaction (CO 2 RR) with a low onset potential and good selectivity. The major products are a mixture of H 2 and CO gases that can be used for methanol production in the Fischer−Tropsch process.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 9
·3636-3645
·
IF 6.482
Xiaoqin Li,Taotao Gao,Qilin Liu,Yanxue Xu,Jing Li,Dan Xiao
Fiber-shaped energy storage devices (FESDs) are indispensable for developing portable and wearable electronic products. Aqueous rechargeable Ni/Fe batteries are an appropriate candidate due to the cost-effectiveness, high ionic conductivity, and great safety. However, their energy density is still far from satisfactory, hindering further practical applications. Herein, we focused on studying binder-free fibrous electrodes for high-performance FESDs based on rechargeable Ni/Fe batteries. A fast microwave-assisted synthesis method was adopted to grow active materials with a 3D conductive network which is constructed from carbon nanotubes decorated with Fe–Fe3C nanoparticles. Due to the heterogeneous structure, the active materials depicted improved electron/ion transfer, boosting the electrochemical performance of the anode. A flexible Ni/Fe battery is successfully fabricated using the aforementioned anode coupled with a NiCoO-based cathode which is synthesized by electrodeposition and a post-annealing process. Thanks to the special structure of the active materials and the fast redox reaction, the assembled flexible Ni/Fe battery achieved high electrochemical properties with a maximum volumetric specific capacity of 1.61 mA h cm−3 and energy density of 1.28 mW h cm−3. The cycling stability and mechanical flexibility were also tested, which demonstrated the prospects for practical application.
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 ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Hesheng Yu,Dawei Liu,Katam Srinivas,Fei Ma,Ziheng Zhang,Mengya Wang,Yu Wu,Yue Wang,Xinsheng Li,Yuanfu Chen
It is still challenging but crucial to plumb non-noble metal-based oxygen reduction reaction (ORR) catalysts with comparable or better performance than benchmark Pt/C catalysts. Herein, we proffer an unconventional core-shell-structured iron-based heterostructure electrocatalyst constructed by a Fe/Fe 3 C heterostructure nanoparticle core wrapped by a graphitic shell embedded on a conductive N-doped mesoporous graphite skeleton (Fe/Fe 3 C@NC) via facile pyrolysis of MIL-53(Fe) (MIL = Matérial Institute Lavoisier) and melamine. The Fe/Fe 3 C@NC catalyst delivers more positive half-wave potential ( E 1/2 ) of 0.86 V and a low Tafel slope of 56 mV dec −1 for ORR, outpacing the benchmark Pt/C catalyst, and it also shows remarkable long-term durability and excellent methanol tolerance. The marvelous ORR behaviors can be attributed to its distinctive morphologic structure: the heterostructure can enhance intrinsic ORR activity; the core-shell nanostructure can enhance ORR activities through unique electron transfer between iron species and their conductive carbon shells, which can also act as protective barriers to ensure long-term stability; the high-content pyridinic-N doping can be used as additional active centers; and the abundant mesopores facilitate the diffusion of electrolyte, which can further upgrade ORR activities. This study proffers a strategy to design and fabricate non-noble catalysts with well-designed nanoarchitecture and high catalytic activity.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Shuting Huang,Yanxian Geng,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jianmei Lu
Microbial fuel cells (MFCs) have become new energy approach for sustainable development. The exploitation of economic and efficient electrocatalysts for the oxygen reduction reaction (ORR) is essential for obtaining remarkable MFCs performance. Herein, metal–organic framework (MOF)-derived Fe/Fe 3 C embedded in nitrogen-doped carbon hybrids, prepared through a simple solvothermal and pyrolysis approach, are highly efficient ORR catalysts. The unique mixed dimension (1D/2D) and mesoporous structure provide abundant active sites and build transfer channels for improvement. Additionally, the presence of nitrogen doping played an important role to accelerate electron diffusion and transport. A maximum power density of 1974.75 ± 26.16 mW m −2 is earned by Fe/Fe 3 C/NC-800, and is 1.45 times of 20% Pt/C (1366.45 ± 28.65 mW m −2 ). Therefore, the Fe/Fe 3 C/NC catalyst is a prospective ORR catalyst in MFCs and in future renewable energy storage and conversion technologies.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Minghui Xiang,Yueying Wang,Xinlei Ren,Zhiyuan Yang,Yujing Huang,Shiting Zhu,Long Chen,Jin Zhang,Hui Li
Tetrabromobisphenol A (TBBPA), a brominated flame retardant with environmental hazards poses challenges for degradation into less dangerous small molecule compounds using conventional single reduction or oxidation methods. In this study, N-doped Fe/Fe 3 C@NC was prepared as an efficient catalyst for TBBPA degradation in a sequential reduction–oxidation system (SROS). Nitrogen-doped carbon as support decelerated the oxidation of Fe 0 and simultaneously accelerated electron transfer within the composites. After the reduction reaction, the Fe species in Fe/Fe 3 C@NC were converted to Fe 2+ , which activated peroxymonosulfate more efficiently. Thus, the degradation rate constant ( k obs ) of TBBPA reached 0.132 min −1 , significantly higher than that of a single oxidation system (0.0464 min −1 ). In addition, the SROS generated more reactive oxygen species, especially O 2 •- and 1 O 2 , which facilitated electron transport and consequently led to the rapid degradation of TBBPA. Degradation pathways of TBBPA in a SROS were initially proposed, with TBBPA being debrominated gradually during reduction and then directly oxidized by cleaving the central carbon. TBBPA mineralization percentage in the SROS reached 86 %, which was the result of the reduction initially increased the oxidizability of the pollutant and ring-opening susceptibility. Predicting the toxicity of the intermediates revealed that the intermediate products generated by the SROS during the TBBPA degradation had lower toxicity. This study provides insights into the efficient mineralization of organic pollutants for the remediation of aquatic environments.
研究领域:
环境科学
·
催化化学
✓ 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）