MOLECULES
·
2024
·Vol. 29
·期 10
·2349
·
IF 4.2
Ziwei Deng,Wei Liu,Junyuan Zhang,Shuli Bai,Changyu Liu,Mengchen Zhang,Chao Peng,Xiaolong Xu,Jianbo Jia
A Fe-Co dual-metal co-doped N containing the carbon composite (FeCo-HNC) was prepared by adjusting the ratio of iron to cobalt as well as the pyrolysis temperature with the assistance of functionalized silica template. Fe1Co-HNC, which was formed with 1D carbon nanotubes and 2D carbon nanosheets including a rich mesoporous structure, exhibited outstanding oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic activities. The ORR half-wave potential is 0.86 V (vs. reversible hydrogen electrode, RHE), and the OER overpotential is 0.76 V at 10 mA cm−2with the Fe1Co-HNC catalyst. It also displayed superior performance in zinc–air batteries. This method provides a promising strategy for the fabrication of efficient transition metal-based carbon catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Heliyon
·
2024
·
IF 3.4
Lijuan Feng,Jie Liu,Shizhao Wang,Yingying Zhao,Fei Li,Xiaofu Guo,Junsheng Yuan
Sulfite oxidation is critical for the stable operation of desulfurization process and the treatment & recovery of desulfurization by-products. The Fe and Co oxides modified super hydrophobic layer was prepared on tubular ceramic membranes using hydrothermal synthesis and surface modifications to realize the combination of the membrane catalysis and membrane aeration. These two oxides were approximately two-layer distributed on the membrane surface, among which the Fe 2 O 3 located in the bottom layer and the Co 3 O 4 located in the upper layer. The catalytic rate of the bifunctional membrane was about 5.8 times than that of the original ceramic membrane, which was decreased with the increasing of Fe/Co ratio and declined after an initial rise with the increase of urea and cetyltrimethylammonium bromide. The conjoint effect of Fe and Co could improve the catalytic performance and reduce the dissolution loss of catalyzer. The oxidation rate tended to be constant after a 15 % decrease in 7 times experiments.
研究领域:
材料科学
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环境工程
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Saudi Chemical Society
·
2016
·
IF 1.978
Yingting Wang,Jiangfeng Huang,Xiaomeng Xia,Xinhua Peng
A highly efficient catalyst Fe–Co/sulfonated polystyrene (Fe–Co/SPS) was introduced and synthesized, which catalyzed BV oxidation of ketones with aqueous hydrogen peroxide to give the corresponding lactones in high yield and selectivity. Solid acid catalyst of Fe–Co/SPS has been prepared by using the 98-wt% sulfuric acid as the sulfonating agent and CoCl 2 combined FeCl 3 as sources of metal ions. Various physical–chemical characterizations including FT-IR, XRD, SEM and TGA, revealed that bimetallic ions Fe 3+ –Co 2+ species in the sulfonated polystyrene framework were responsible for the catalytic activities. The BV reaction catalyzed by Fe–Co/SPS highlighted the special effects between metal ions and protonic acids as well as solvent-free heterogeneous catalytic oxidation with excellent conversion.
研究领域:
化学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Tong Zhu,Jinping Jiang,Jisheng Wang,Zhening Zhang,Jiao Zhang,Jing Chang
A magnetic FeCo 2 O 4 /Co 3 O 4 nanocomposite was successfully synthesized by a facile hydrothermal method as an efficient activator for persulfate (PS) activation to degrade tetracycline (TC) in an aqueous solution. TC removal and mineralization efficiencies reached up to 91.63% and 43.57% in 120 min in the FCC-3/PS system, respectively. The mixed-valence of Fe/Co in the nanocomposite catalyst was beneficial for electrons transfer between Co and Fe elements and enhanced the redox circulation of Fe and Co in between divalent and trivalent. Surficial analysis and phosphate adsorption test confirmed the existence of –OH groups on the surfaces of FeCo 2 O 4 /Co 3 O 4 nanocomposite. Fe/Co redox and surficial hydroxyl in the catalyst played significant roles in the TC potentiation degradation, which was contributed by the plenty of adsorbed –OH groups and excellent dispersity of FeCo 2 O 4 in the FeCo 2 O 4 /Co 3 O 4 composite. The sulfate radicals were major species followed by the hydroxyl radicals , and the surficial adsorbed hydroxyl made great contributions to radical generation. The cycling test and intermediate toxicity analysis indicated that the nanocomposite was considered stable and practicable in water treatment . This work demonstrated that the FeCo 2 O 4 /Co 3 O 4 nanocomposite was an effective and environ-friendly catalyst towards PS activation for removing organic pollutants from water.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROANALYSIS
·
2023
·Vol. 35
·期 5
·e202200521
·
IF 3
Luyi Chen,Ping Xiao,Bin Hu,Yiwen Wang,Jianmao Yang,Jianyun Liu
3-dimensional (3D) Fe−Co−LDH/MXene composite was synthesized by in-situ synthesis and assembly of Fe−Co−LDH rod around MXene under hydrothermal condition. Due to the unique 3D configuration and good conductivity, the obtained Fe−Co−LDH/MXene modified glassy carbon electrode (Fe−Co−LDH/MXene/GCE) showed excellent electrochemical activity for As(III) detection. Via square-wave anodic stripping voltammetry, the response current on Fe−Co−LDH/MXene/GCE had good linear relationship with As(III) concentrations (1∼1000 ppt) with superior sensitivity (0.22 μA ppt −1 cm −2 ) and low detection limit (0.9 ppt). The mechanism of As(III) adsorption was demonstrated. The electrode showed excellent anti-interference ability. Real water sample analysis demonstrated the Fe−Co−LDH/MXene/GCE was deployable in aqua-system.
研究领域:
材料科学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Chunmiao Liu,Yurun Feng,Haibin Sun,Qiangqiang Hu,Hui Xiao,Xue Guo,Huaiqing Zhang
The increasingly complex electromagnetic environment and escalating stealth technology requirements pose unprecedented challenges to multifunctional electromagnetic wave (EMW) absorbing materials. While significant progress has been made, existing SiBCN material systems still struggle to simultaneously achieve broadband absorption and strong attenuation. In response to this demand, we propose a Fe-Co-Ni ternary co-doping strategy from the perspective of multiple doping and magnetic medium coupling. By precisely controlling the content of magnetic elements, the synergistic effect between magnetic loss and dielectric loss is realized. The experimental results show that the minimum reflection loss (RL min ) of the optimized SiBCN/Fe-Co-Ni fibers reach -53.19 dB, and a broadband absorption of 5.36 GHz is achieved at a thickness of 1.98 mm. More importantly, the material maintains excellent stealth performance across a wide range of incident angles. Capitalizing on these outstanding properties, we have successfully designed a low radar cross-section (RCS) stealth antenna. The antenna exhibits a 27.5 dBsm RCS reduction at 9.24 GHz. This work not only clarifies the synergistic mechanism of multiple magnetic doping to regulate electromagnetic parameters, but also provides new ideas for the development of new generation of smart stealth materials and devices.
研究领域:
材料科学
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电磁学
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天线设计
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隐身技术
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2020
·Vol. 13
·期 3
·1023-1033
·
IF 4.853
Yugang Qi,Shan Yuan,Lili Cui,Zizhun Wang,Xingquan He,Wei Zhang,Tewodros Asefa
Graphical Peak Power ! Novel hybrid materials composed of N-doped carbon nanotubes (CNTs) with several embedded Fe−Co alloy nanoparticles (CNTs@(Fe,Co)PP) that can serve as highly efficient bifunctional oxygen electrocatalysts are derived from bimetallic Fe/Co-coordinated polyporphyrin-CNTs self-assemblies via pyrolysis. The optimal electrocatalyst is used at air electrode in zinc-air battery (ZAB) delivering a higher peak power density and showing a better long-term cycling stability than a ZAB containing the noble metal electrocatalysts Pt/C+RuO 2 . The design and fabrication of efficient, less costly, and stable bifunctional oxygen electrode electrocatalysts is crucial for large-scale production of rechargeable zinc-air batteries. Herein, electrocatalytically active, hybrid materials composed of Fe−Co alloy nanoparticles-embedded N-doped carbon nanotubes (CNTs) are synthesized from Fe/Co-polyporphyrin-CNTs via pyrolysis. The materials serve as highly effective bifunctional oxygen electrode catalysts for zinc-air batteries. In particular, the one synthesized at 700 °C, named CNTs@(Fe,Co)PP-700, shows a very good activity for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in an alkaline solution. This material catalyzes ORR with a limiting current density of 5.11 mA cm −2 and a half-wave potential of 0.86 V vs RHE. It also catalyzes OER with 10 mA cm −2 at a small overpotential of 360 mV. Besides, it operates well as an air cathode in a home-made rechargeable zinc-air battery, with a small voltage gap of 0.71 V at 2 mA cm −2 , while remaining stable in hundreds of charge-discharge cycles for >83 h. Its performance in a zinc-air battery is better than that of a benchmark air-electrode containing noble metals, Pt/C+RuO 2 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 1
·1399-1412
·
IF 5.19
Chen Jun,Zhang Boding,Wang Bingxing,Zhang Wenlong,Wang Jichao,Cui Chengxing,Wang Songlin
Wastewater containing quinoline has become a common pollutant in water and soil environments, which poses a threat to human health due to its carcinogenicity, teratogenicity, and mutagenicity. Quinoline’s stability and toxicity hinders its degradation by conventional physicochemical and biological methods. In this contribution, Fe-Co-Bi/kaolin particle electrodes were prepared for the efficient degradation of quinoline in wastewater, and characterized by using scanning electron microscope, X-ray diffraction, pyridine-IR, Brunauer–Emmett–Teller, X-ray photoelectron spectroscopy, and four-probe resistivity test. Parameters affecting the degradation efficiency were optimized to be the particle electrode dosage of 40 g/L, pH 3.5, H 2 O 2 addition of 67.6 mmol/L, electrical conductivity of 12.7 ms/cm, and voltage of 20 V. The constructed three-dimensional catalytic particle electrode system (3D-CPE) achieved 92.1% removal rate of chemical oxygen demand (COD) under the optimal conditions. Hydroxyl radicals (•OH) generated in the 3D-CPE process were identified by radical scavenging tests and electron spin response analysis. To unravel the degradation mechanism, the intermediate products were identified by using high performance liquid chromatography-mass spectrometry. The degradation mechanism was discussed with the help of theoretical calculation.
研究领域:
环境工程
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水处理
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2021
·Vol. 9
·期 4
·2104237
·
IF 16.806
Qinglin Han,Ximeng Zhao,Yuhong Luo,Lanlan Wu,Shujuan Sun,Jingde Li,Yanji Wang,Guihua Liu,Zhongwei Chen
Rational design of metal oxide supported non-precious metals is essential for the development of stable and high-efficiency oxygen reduction reaction (ORR) electrocatalysts. Here, an efficient ORR catalyst consisting of binary Fe/Co nanoclusters supported by defective tungsten oxide and embedded N-doped carbon layer (NC) with a 3D ordered macroporous architecture (3DOM Fe/Co@NC-WO 2− x ) is developed. The oxygen deficient 3DOM WO 2− x not only serves as a porous and stable support, but also enhances the conductivity and ensures good dispersion of the binary Fe/Co nanocluster, benefiting its ORR catalytic activity. Theoretical calculation shows that there exists a synergistic effect of electron transfer from Fe to Co in the supported binary Fe/Co cluster, promoting the ORR reaction energetics. Accordingly, the 3DOM Fe/Co@NC-WO 2− x catalyst exhibits excellent ORR activity in alkaline medium with a half wave potential ( E 1/2 ) of 0.87 V higher than that of Pt/C (0.85 V). The zinc–air batteries assembled by 3DOM Fe/Co@NC-WO 2− x cathode deliver a higher power density and specific capacity than that of Pt/C. A new strategy of combining synergistic binary-metal nanoclusters and conductive metal oxide support design is provided here to develop efficient and durable ORR electrocatalyst.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ying Fang,Qianwen Liu,Yang Song,Feiyue Jia,Ying Yang,Haipu Li
Dissolved organic matter (DOM) extensively exists in high-arsenic groundwater with relatively high concentration, which could not only compete with arsenic for adsorption sites, but also depress As(III) oxidation in persulfate-based advanced processes (PS-AOPs) through scavenging free radicals (SO 4 • − and •OH). In order to effectively avoid the negative effect of DOM , an Fe/Co bimetallic metal–organic framework (Fe/Co MOF)-coupled peroxymonosulfate (Fe/Co MOF-PMS) system was rationally constructed for non-radical-dominated As(III) oxidation and chemisorption-driven As(V) adsorption. Results showed that the Fe/Co MOF-PMS system did realize anti-interference As(III) immobilization in DOM-rich high-arsenic groundwater, which was evidenced by no difference in As(III) immobilization efficiencies in the absence and presence of 20 mg/L humic acid (HA). During the oxidation process, 1 O 2 dominated As(III) oxidation while O 2 • − dominated HA oxidation, and the presence of HA significantly promoted the generation of 1 O 2 besides SO 4 • − and •OH. During the adsorption process, chemical adsorption mainly drove As(V) adsorption such as forming M-O-As (M = Fe, Co) bond, while physical adsorption forces played a major role in HA adsorption, such as π-π interaction, hydrogen bonding, and electrostatic attraction. The synergism of oxidation and adsorption processes made the anti-interference As(III) immobilization in DOM-rich high-arsenic groundwater in Fe/Co MOF-PMS system come true. This work is believed to shed light on the highly efficient purification of DOM-rich high-arsenic groundwater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Mingyao Yang,Yanwei Li,Jinhuan Yao,Jiqiong Jiang,Xuejiao Chen,Wenhan Xu
Prussian blue (PB) and its analogs (PBAs) have become a research hotspot in the fields of electrochemical energy storage and electrochromism due to their good reversible redox activity, and reversible color change response in different redox states. Herein, a series of trimetallic PBAs (Co/NiHCF with Co to Ni molar ratios of 1:0, 3:1, 1:1, 1:3, and 0:1) are synthesized by a facile co-precipitation method. In particular, the impact of Co to Ni molar ratio on the lithium storage and electrochromic properties of Co/NiHCF materials are systemically investigated. All five samples possess good crystallinity but the particle size decreases with the reduction of Co/Ni molar ratio. The color change, redox reaction potential, and lithium storage activity of the samples can be readily controlled by adjusting the molar ratio of Co to Ni. The lithium storage activity of the samples strengthens with the increase of Ni content in Co/NiHCF, accompanied by a decrease in redox potentials. With the increase of Ni content, the color of the Co/NiHCF film in the oxidation state changes from purple-red to orange, and finally to yellow; in the reduction state, the color of the film changes from green to light green and then to colorless. All the samples exhibit superior rate capability, excellent cycling stability, and short switching time (in the range of 1.6 to 4.3 s). The present work demonstrates a facile strategy for readily tunning the lithium storage activity, redox reaction potentials, and realizing rich color changes of PBA-based bifunctional materials.
研究领域:
电化学
·
材料科学
·
能源存储
·
电致变色
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yong He,Xiao Kang,Hui-wen Xiong,Lei Zhang
Spinel composite is being considered for electrode materials in molten salt electrolysis, aiming to improve high-temperature stability and conductivity. Multi-phase composites with the general formula of (Fe 1-3 x - y Ni y Co x Cr x Mn x ) 3 O 4 ( x = 0.03, 0.06, 0.09, y = [1-2 x ]/3) were prepared via in situ SPS method. The composites were confirmed to consist of spinel and rock-salt phases through XRD and SEM analysis. Compared to the Ni–Fe–O system, the doping of Cr, Mn and Co improved the phase stability of the spinel during SPS, but hindered the shrinkage process. These composite exhibited low thermal diffusivity (1.236–2.481 m 2 /s, room temperature) and low coefficient of thermal expansion (9.8 - 14.4 × 10 −6 K −1 , 400–800 °C). Moreover, the composite with x = 0.06 and y = 0.29 exhibit 94.4 % lower permittivity, 7 times higher dielectric loss (at 40 Hz) and 26.6 % lower high-temperature conductivity (at 800 °C) than that of Ni–Fe–O system. This work demonstrates the enhanced thermal and electrical properties of spinel-based composites, which can provide inspiration to researchers and promote the development of high-temperature electrodes.
研究领域:
材料科学
·
高温电极材料
✓ 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）