IONICS
·
2025
·
IF 2.6
Yong Daming,Kang Xiaomeng,Yin Ming,Wu Qichao
First, a spherical Fe 3 O 4 was synthesized using the hydrothermal method, and subsequently coated with carbon to form a core–shell C/Fe 3 O 4 composite. The Fe 3 O 4 core was then dissolved in an etching solution to create a hollow carbon (H-C) structure. This H-C served as a substrate onto which a Fe 3 O 4 layer was deposited via the hydrothermal method, resulting in a hollow core–shell Fe 3 O 4 /C composite. Finally, the solvothermal method was employed to coat the Fe 3 O 4 /C composite with a layer of hydrogenated titanium dioxide (H-TiO 2 ), resulting in a hollow-structured H-TiO 2 /Fe 3 O 4 /C material. This structure not only ensures the formation of a dual-core shell structure, but also reduces the proportion of carbon material in the composite electrode, thereby enhancing the theoretical specific capacity of the composite electrode. The presence of H-TiO 2 and carbon improved the cyclic stability of Fe 3 O 4 within the composite. This hollow sandwich–structured composite demonstrated excellent electrochemical performance, delivering a discharge specific capacity of 629.5 mAh g −1 after 500 cycles at 0.2 A g −1 , along with a high initial coulombic efficiency of 80.6%.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2013
·
IF 3.473
Yingying Luo,Ziyang Lu,Yinhua Jiang,Dandan Wang,Lili Yang,Pengwei Huo,Zulin Da,Xuliang Bai,Xulan Xie,Pengyi Yang
The magnetic and dual conductive imprinted photocatalysts (MCIPs) were synthesized through the suspension polymerization method. TiO 2 /Fe 3 O 4 /MWCNTs, 1-methylimidazole-2-thiol and pyrrole were used as supports, template molecule and functional monomer, respectively. The MCIPs were further characterized by X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), scanning electron microscopy (SEM), transmission electron microscope (TEM), UV–visible diffuse reflectance spectra (UV–vis DRS), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM). The result revealed that polypyrrole (PPy) was formed and well embedded in the surface imprinted layer of TiO 2 /Fe 3 O 4 /MWCNTs. Owing to PPy and MWCNTs, the MCIPs was equipped with dual conductivity which was particularly useful for photodegradation of 1-methylimidazole-2-thiol in aqueous solution under ultraviolet irradiation. Through a series investigation of factors, it was obvious that when the polymerization time was 24 h and the adding dose of pyrrole was 8 mmol, the resulting MCIPs obtained the highest photocatalytic ability. In addition, the photodegradation process obeyed the pseudo-first-order kinetic reaction and exhibited an excellent selective degradation ability of 1-methylimidazole-2-thiol. The degradation intermediate products and mechanism of 1-methylimidazole-2-thiol were further discussed.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Jianye Shi,Jin Chen,Xinle Wang,Zhikang Liu,Yuzhao Ma,Xiaofeng Yang,Meidan Que,Yanjun Li
Developing a lightweight microwave absorbing materials with high absorption capacity and wide absorption bandwidth at low thickness is a perennial challenge in practical applications in the microwave absorption (MA) field. Herein, sandwich-like heterogeneous Ti 3 C 2 T x /TiO 2 /Fe 3 O 4 /Fe are designed by synergistically incorporating dielectric-magnetic components with a simple solvothermal method and post-annealing. The sandwich-like heterogeneous interface produces sufficient conduction loss for Ti 3 C 2 T x /TiO 2 /Fe 3 O 4 /Fe, with TiO 2 crystals and amorphous carbon anchored on its surface to enhance interface polarization and Debye relaxation. Additionally, the presence of Fe nanoparticles induces magnetic loss, including natural resonance and eddy current loss. By bidirectionally regulating the ratio of Ti 3 C 2 T x and Fe 3 O 4 , the minimum reflection loss (RL min ) value reaches − 64.6 dB at 17.49 GHz with a 1.48 mm thickness, and the corresponding effective absorption bandwidth (EAB, RL < −10 dB) is 4.59 GHz (13.41–18 GHz). The results suggest that the exceptional EMW absorption performance of composites can be attributed to the dielectric-magnetic synergistic effect and sandwich-like heterostructures . This study offers a rational approach for synthesizing ultrathin and lightweight Ti 3 C 2 T x -based absorbers.
研究领域:
材料科学
·
电磁学
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DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2023
·Vol. 56
·期 43
·435503
·
IF 3.4
Ting Zhang,Xiaoyun Huo,Ling Wang,Fang Ma,Yafei Hou
Dielectric capacitors with satisfactory energy storage performances are highly demanded. Herein, x vol.% TO@FO@ethanediamine (EDA)-poly (vinylidene fluoride) (PVDF) nanocomposites combining the novel one-dimensional (1D) hybrid TiO2@Fe3O4@ethylenediamine (TO@FO@EDA NWs) as fillers and PVDF as matrix deliver the enhanced energy storage performances. Compared with the TO-, TO@EDA- and TO@FO- filled nanocomposites, TO@FO@EDA filled nanocomposites deliver the highest polarization, breakdown strength and energy storage performances because of the synergistic effects of 1D TO, conductive FO and EDA. As a result, the 2 vol.% TO@FO@EDA-PVDF nanocomposite shows the highest polarization difference (6.92 μC cm−3 at 435 kV mm−1), leading to an excellent discharged energy density (13.64 J cm−3), which is 192% higher than that of the pure PVDF (7.11 J cm−3). The primary results might provide a new solution to optimize the energy storage performances of polymer-based nanocomposites.
研究领域:
材料科学
·
能源存储技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jie Yang,Jia Li,Xiaohui Yan,Yangsai Lyu,Ningning Xing,Ping Yang,Peng Song,Min Zuo
A novel multifunctional Janus magnetic micromotor was designed and constructed by using MIL-100(Fe)@TiO2@Fe3O4 multicore–shells modified with horseradish peroxidase (HRP) as a smart active platform to realize detection and degradation of hydroquinone (HQ). The obtained micromotor showed a unique three-dimensional (3D) hierarchical architecture with highly exposed active sites and could autonomously move at a speed of 140 ± 7.0 μm·s–1 by O2 bubbles generated from the catalytic decomposition of H2O2 fuel. Benefiting from the combination of active self-propulsive motion, high peroxidase-like activity, tuned heterojunctions with matching band structures, and a 3D hierarchical structure, an effective platform involving dynamically sensitive detection and quick removal of HQ from water was established by using the multifunctional HRP-integrated MIL-100(Fe)@TiO2@Fe3O4 Janus micromotor. The proposed multifunctional Janus magnetic micromotor had advantages of simple and feasible fabrication, sensitive detection and effective photo-Fenton degradation of HQ in a wide pH range of 4–7, and magnetic recycling, revealing potential for environmental remediation applications.
研究领域:
环境科学
·
纳米材料学
·
生物化学
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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）