CHINESE JOURNAL OF CATALYSIS
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2025
·
IF 17.7
Yangyang Li,Jingyi Yang,Botao Qiao,Tao Zhang
Supported metal catalysts are the backbone of heterogeneous catalysis, playing a crucial role in the modern chemical industry. Metal-support interactions (MSIs) are known important in determining the catalytic performance of supported metal catalysts. This is particularly true for single-atom catalysts (SACs) and pseudo-single-atom catalysts (pseudo-SACs), where all metal atoms are dispersed on, and interact directly with the support. Consequently, the MSI of SACs and pseudo-SACs are theoretically more sensitive to modulation compared to that of traditional nanoparticle catalysts. In this work, we experimentally demonstrated this hypothesis by an observed size-dependent MSI modulation. We fabricated CoFe 2 O 4 supported Pt pseudo-SACs and nanoparticle catalysts, followed by a straightforward water treatment process. It was found that the covalent strong metal-support interaction (CMSI) in pseudo-SACs can be weakened, leading to a significant activity improvement in methane combustion reaction. This finding aligns with our recent observation of CoFe 2 O 4 supported Pt SACs. By contrast, the MSI in Pt nanoparticle catalyst was barely affected by the water treatment, giving rise to almost unchanged catalytic performance. This work highlights the critical role of metal size in determining the MSI modulation, offering a novel strategy for tuning the catalytic performance of SACs and pseudo-SACs by fine-tuning their MSIs.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Chenying Zhao,Runxia Tao,Jing Li,Bo Hong,Jingcai Xu,Xiaoling Peng,Hongwei Chen,Shi Qiu,Nan Zhang,Xinqing Wang
The rapid advancement of 5G technology and wearable electronics has intensified the demand for high-performance electromagnetic wave absorption (EA) materials. Developing lightweight, efficient, and broadband EA materials is essential to mitigate electromagnetic pollution. In this work, CoFe 2 O 4 /graphene aerogel (GA) nanocomposites were fabricated via a simple hydrothermal and freeze-drying method. The effect of CoFe 2 O 4 nanoparticles on the microstructure and EA properties was systematically investigated in detail. Results indicated that the nanocomposites with 4.5 wt% CoFe 2 O 4 (CFO 4.5 /GA) exhibited the optimal performance, achieving a minimum reflection loss (RL min ) of -42.99 dB and an effective absorption bandwidth (EAB) of 3.68 GHz at a thickness of 4.0 mm. Notably, the RL min of CFO 4.5 /GA is six times higher than that of GA. Radar cross-section (RCS) simulations further confirm its superior EA capability, with a maximum RCS reduction of 40 dB·m 2 at θ = 25°. The impedance matching was optimized by adjusting the complex permittivity of GA and permeability of CoFe 2 O 4 , avoiding reflection. Subsequently, the penetrated waves are attenuated and converted into thermal energy during propagation. Due to its excellent thermal conductivity of GA and the effective combination of CoFe 2 O 4 and GA, the heat generated from magnetic and dielectric losses can be efficiently transferred and dissipated. Owing to its lightweight structure and outstanding EA performance, the CFO 4.5 /GA nanocomposites possess significant promise for shielding high-power wearable electronic devices from electromagnetic interference.
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2026
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IF 8.3
Zhipeng Wang,Xiaojie Zhu,Weixiang Gao,Yuliang Zhang,Junfeng Li,Yingchang Jiang,Xueting Chang,Shibin Sun
Spinel ferrites with a general formula of AFe 2 O 4 (A=Zn, Mn, Ni, or Co) have attracted considerable attention in chemiresistive gas sensors, given their superior chemical stability and good catalytic activity. However, the development of spinel ferrite-based gas sensors that simultaneously possess high selectivity and excellent humidity resistance has so far remained challenging. Herein, we successfully fabricated a novel CoFe 2 O 4 /WO 3 /Ag (CWA) composite by depositing the WO 3 nanosheets and Ag nanoparticles successively onto the porous CoFe 2 O 4 (CFO) nanosheets that were obtained through co-precipitation, calcination, and in-situ reduction methods. Due to the unique porous layered structures of the CFO nanosheets, the formation of p-n heterojunctions between the CFO and WO 3 nanosheets, and the catalytic effects of the Ag nanoparticles, the CWA composite-based gas sensor exhibited distinct selectivity (at least 4 times enhanced sensitivity), wide detection range (0.1∼500 ppm) reproducibility (RSD=1.3% in 5 independent batches), stability (maximum 4.4% fluctuation over 56 days), and humidity resistance (>60.7% response retention at 90% RH) towards triethylamine (TEA). Density functional theory (DFT) calculations further proved the intense TEA chemisorption on the Fe sites and the indispensable role of Ag in electron mobility modulation. In addition, a practical gas-sensing system was also developed to demonstrate its real-world implementation. This study provided a general strategy for constructing spinel ferrite-based gas sensors that could work in high-humidity environments.
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高影响因子
DIAMOND AND RELATED MATERIALS
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2025
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IF 5.1
Ruobing Cao,Yan Qiu,Xiaoning Zhao,Di Lan,Yiman Lu,Zhongqiang Wang,Haiyang Xu,Yichun Liu
Biomass-derived carbon materials have drawn great attention in various fields with low cost and good sustainability. In this paper, carbon-CoFe 2 O 4 (C/CoFe 2 O 4 ) composites with natural hierarchical and gradient porous structure are prepared by hydrothermal and carbonization methods from corn stalks. The effect of the CoFe 2 O 4 precursor content on the microwave absorption (MA) performance is studied and the sample with CoFe 2 O 4 at concentrations of 20 mmol/L exhibits the best MA performance. The minimum reflection loss of the composites can reach a value of −56.78 dB at a thickness of 2.50 mm, and the effective absorption bandwidth of the composites can be up to 8.00 GHz at the thickness of 2.25 mm. The MA mechanism of the composite is mainly attributed to the good impedance matching and multiple attenuation characteristics. This work presents an efficient MA material and simultaneously facilitates the productive utilization of agricultural waste corn stalks.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
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IF 6
ErJie Yuan,Wen Wang,XinYue Zhang,JingBing Wang,YunXiang Yuan,HongChao Zhang,SaiNan Wei
To address the limitations of conventional microwave absorbers, such as high density, inferior mechanical stability, and narrow effective absorption bandwidth, aramid nanofibers (ANF) were employed as the three-dimensional skeleton, and spinel CoFe 2 O 4 nanoparticles served as the magnetic loss component. A series of ANF/CoFe 2 O 4 composite aerogels with different particle loadings (15 wt%, 25 wt%, 35 wt%, 45 wt%) were fabricated via deprotonation exfoliation, surface modification, solvothermal reaction, and freeze-drying routes. The microstructure, phase composition, chemical valence states, and electromagnetic parameters were systematically characterized. The results show that CoFe 2 O 4 nanoparticles are uniformly anchored on the ANF network with favorable crystallinity and stable elemental valence. With increasing loading, the dielectric permittivity rises first and then declines, while the magnetic permeability increases monotonically. The 25 wt% sample achieves optimal dielectric-magnetic impedance matching. At a matching thickness of only 3.32 mm, its minimum reflection loss reaches −50.71 dB, and the effective absorption bandwidth is 4.73 GHz, covering the X–Ku bands. The excellent absorption performance originates from the synergistic effect of multi-scale scattering in the porous network, enhanced interfacial polarization, and combined dielectric–magnetic loss. This lightweight and robust ANF-based aerogel provides a promising candidate for high-efficiency electromagnetic wave absorption materials.
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高影响因子
Materials
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2020
·Vol. 13
·期 17
·3860
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IF 3.057
Chen Cheng,Jianfeng Dai,Zengpeng Li,Wei Feng
The morphology of magnetic materials has a great influence on the properties, which is attributed to the magnetic anisotropy of the materials. Therefore, it is worth studying the fabrication of the aligned fiber and the change of its domain distribution. Nanoparticles and nanofibers were prepared by the hydrothermal and electrospinning methods, respectively. At the same time, the arranged nanofibers were collected by the drum collecting device. After the same annealing at 700 °C, it was found that the diameter of fibers collected by different collecting drums is similar. By studying the hysteresis loops of nanoarrays, it was found that they had strong anisotropy. The easy axis was parallel to the long axis, the Hc and Mr of the easy axis and the hard axis were 1330.5 Oe, 32.39 Am2/kg, and 857.2 Oe, 24.8 Am2/kg, respectively. Due to the anisotropy of the shape and the interaction between the particles, the Hc could not be enhanced. Therefore, the Ms and Hc of the nanoparticles were 80.23 Am2/kg and 979.3 Oe, respectively. The hysteresis loop and the change of magnetic moment during the demagnetization of the CoFe2O4nanofiber array were simulated via micromagnetic software. The simulated Hc was 1480 Oe, which was similar to the experimental value.Keywords:electrospinning;aligned nanofibers;nanoparticle;anisotropy;micromagnetic simulation
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2017
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IF 2.986
Huitao Fan,Bo Li,Zhenzhen Shi,Ling Zhao,Kun Wang,Dongfang Qiu
Magnetic CoFe 2 O 4 nanoparticles were encapsulated with fibrous silica shells via a simple self-assembly process to fabricate a novel, bifunctional, nanocomposite of fibrous-structured silica-CoFe 2 O 4 . The nanocomposite not only exhibited fibrous spherical morphology, typical mesoporous structure, high specific surface area and narrow size distribution, but also excellent superparamagnetic features and good monodispersity. Further study demonstrated that doxorubicin hydrochloride could be easily loaded onto the CoFe 2 O 4 @FMS (fibrous morphology silica) nanoplatforms and released with pH stimuli. Additionally, MTT assay confirmed that CoFe 2 O 4 @FMS NPs have good biocompatibility. Therefore, a novel nanocarrier based on CoFe 2 O 4 @FMS is proposed, with potential application for targeted cancer therapy.
研究领域:
材料科学
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生物医学工程
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肿瘤学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Xiurong Zhu,Lei Ge,Wei Yan,Shengjiong Yang,Gen Wang,Delu Miao,Pengkang Jin
Heterogeneous activation of peroxymonosulfate (PMS) has been frequently proposed for the degradation of organic pollutants via the generation of reactive oxygen species (ROS). Spinel ferrite such as CoFe 2 O 4 shows great advantage for PMS activation but suffers from aggregation problem and lack of microstructure. Herein, network-like CoFe 2 O 4 immobilized on volcanic rock was synthesized for PMS activation for degrading sulfamethoxazole (SMX). The immobilized CoFe 2 O 4 network exhibited good catalytic performance for SMX removal. Systematic investigations, including in situ ATR-FTIR and Raman spectroscopy analysis, chemical quenching experiments and electron paramagnetic resonance (EPR) tests, revealed that a redox cycle of Co 2+ /Co 3+ induced the generation of ROS (SO 4 •− , OH • and 1 O 2 ) that participated in the degradation of SMX. Background constituents (e.g., inorganic ions and natural organic matters) exhibited limited influence on SMX removal. A continuous flow-through reaction in a fixed-bed column revealed the immobilized CoFe 2 O 4 network could efficient degrade SMX with long-term durability, which therefore can be a promising catalyst for PMS activation for the degradation of SMX.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Jun Li,Ge Gou,Hailing Zhao,Chao Liu,Naiwen Li,Longguo Li,Bo Tan,Bo Lai
CoFe 2 O 4 -CeO 2 composites with different CoFe 2 O 4 content were synthesized and used as catalysts for peroxymonosulfate (PMS) activation in water purification. Under the conditions of 200 mg/L 15%CoFe 2 O 4 -CeO 2 and 0.15 mM PMS, complete atrazine degradation was achieved in the 15%CoFe 2 O 4 -CeO 2 /PMS system. The pseudo-first-order rate constant ( k obs ) in 15%CoFe 2 O 4 -CeO 2 /PMS system (0.224 min −1 ) was 2.4 and 4.8 times of that in CoFe 2 O 4 /PMS system (0.092 min −1 ) and (CoFe 2 O 4 + CeO 2 )/PMS system (0.047 min −1 ). The main reactive species were verified through various quenching experiments and electron paramagnetic resonance tests, and the concentration of two main radicals was calculated. In addition, the interaction between CoFe 2 O 4 and CeO 2 involving Co(III)/Co(II), Fe(III)/Fe(II), and Ce(IV)/Ce(III) redox recycle for accelerating the degradation of organic compounds was explored. In addition, different from Cl − , HCO 3 − and NO 3 − , H 2 PO 4 − could promote atrazine degradation in 15%CoFe 2 O 4 -CeO 2 /PMS system by improving sulfate radical concentration in the reaction system. The main degradation intermediates of atrazine in the 15%CoFe 2 O 4 -CeO 2 /PMS and CoFe 2 O 4 /PMS systems were compared, as well as the degradation pathways. The toxicity analysis based on luminescent bacteria Vibrio fischeri indicated the superiority of 15%CoFe 2 O 4 -CeO 2 /PMS than CoFe 2 O 4 /PMS systems for ATZ degradation.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Cong Pan,Qiang Zhang,Wenya Zhang,Jing Bao,Gaopeng Dai,Suqin Liu,Jirong Lan
Porous graphitized carbon (PGC)-supported CoFe 2 O 4 bimetallic catalysts (CoFe 2 O 4 /PGC) were prepared by a hydrothermal method using Fe(NO 3 ) 3 ·9H 2 O and Co(NO 3 ) 2 ·6H 2 O as precursors and were used to activate peroxymonosulfate (PMS) for the degradation of chlorobenzene (CB). Under the conditions of CoFe 2 O 4 /PGC catalysts and PMS concentrations of 0.1 g/L and 5 mM, respectively, in a wide range of pH (5.0-9.0) both efficient removal (>68%) of 25 ppmv CB could be achieved. Electron spin resonance (ESR) and quenching experiments show that SO 4 •− and HO • were the main reactive radicals in the CoFe 2 O 4 /PGC-PMS system. In addition, the steady-state concentrations of SO 4 •− and HO • were estimated using the use of hydroxybenzoic acid (HBA) and benzoic acid (BA) as probes for 97.8 μM and 327.5 μM. Electrochemical characterization method demonstrated that the CoFe 2 O 4 /PGC catalysts showed better electron transfer capacity and better activation of PMS compared with CoFe 2 O 4 and PGC. The XRD and metal ion dissolution experiments (less than 0.33 ppm) illustrated that the catalysts possessed better stability before and after reaction. Moreover, the CB removal efficiency at 500 min remained at 77.6% after five runs. And the wet scrubber can remove gaseous CB, dichloroethane, trichloroethylene, dichloromethane over 70%. This study might provide a new idea for PGC-supported heterogeneous catalysts for CVOCs wet oxidation.
研究领域:
环境科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Zhipeng Wang,Xueting Chang,Junfeng Li,Xiaojie Zhu,Yuliang Zhang,Dongsheng Wang,Yingchang Jiang,Shibin Sun
Development of chemo-resistive room-temperature ammonia (NH 3 ) sensor with high performance remains a great challenge to this day. In this paper, we demonstrate a room-temperature NH 3 sensor based on organic-inorganic cobalt ferrite (CoFe 2 O 4 )/polyaniline (PANI) composite. The CoFe 2 O 4 porous nanosheets were firstly prepared by using a direct precipitation method, and then the PANI were anchored onto the surfaces of the CoFe 2 O 4 porous nanosheets through an in-situ polymerization process to form the CoFe 2 O 4 /PANI composite. The crystal structure, morphology, and surface chemistry of the CoFe 2 O 4 /PANI composite were characterized by combined techniques of X-ray diffraction, electron microscopy, and spectroscopy. Due to the porous feature of the composite and the formation of p-p heterojunctions between the CoFe 2 O 4 and PANI, the CoFe 2 O 4 /PANI gas sensor exhibited excellent NH 3 -sensing performance with high response (13 to 100 ppm NH 3 ), good selectivity, wide detection range (10–500 ppm), and rapid response/recovery rate (18/31 s to 100 ppm NH 3 ) at room temperature. Additionally, the CoFe 2 O 4 /PANI gas sensor owned outstanding repeatability and long-term stability. This study offered a promising candidate of CoFe 2 O 4 /PANI composite for constructing room-temperature NH 3 sensor.
研究领域:
材料科学
·
传感器技术
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Haoran Yu,Longgang Chu,Cheng Gu,Mingyang Xing
In this study, we present an effective modification strategy for cobalt ferrate (CoFe₂O₄), a cost-effective heterogeneous Fenton catalyst. Electron microscopic observation and X-ray diffraction results confirmed the successful hydrothermal synthesis of F-CoFe₂O₄/MoS₂. Notably, F-CoFe₂O₄/MoS₂ exhibited a high pollutant degradation efficiency (over 90 % within 30 min) across a broad pH range (4.0–9.0), along with excellent cyclic stability (up to 10 cycles) and environmental robustness. The effectiveness of the catalyst in treating real water samples and its performance in continuous-flow operations were also demonstrated. Fluorine (F) doping and integration with molybdenum sulfide (MoS₂) as a co-catalyst significantly facilitated metal ion release and promoted the formation of an acidic microenvironment on the catalyst surface, which accelerated Fe³ ⁺/Fe²⁺ cycling and enhanced CoFe₂O₄ performance in H₂O₂ activation and pollutant degradation. This work provides valuable insights for designing more efficient catalysts for heterogeneous Fenton oxidation systems in water treatment applications.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
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