COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Jiale Li,Weigang Gu,Dajun Wu,Xuekun Hong,Shi Tao,Bin Qian,Shaohui Xu,Paul K. Chu
The oxygen evolution reaction (OER) is a four-electron-proton reaction requiring a large overpotential. In order to improve the electrocatalytic activity of iron-based OER electrocatalysts, the overpotential must be reduced in order to improve the efficiency and cost-effectiveness. Herein, FeCo LDH, FeCo 2 O 4 , RuO 2 /FeCo 2 O 4 , and Ru/CoFe LDH are synthesized on carbon cloth (CC) by a simple hydrothermal and annealing technique. The materials are characterized systematically, and their electrocatalytic OER properties are evaluated in detail. RuO 2 /FeCo 2 O 4 delivers superior OER performance in 1 M KOH, such as a low onset potential 1.55 V at a current density of 10 mA/cm −2 , a Tafel slope of 85.2 mV/dec −1 , as well as robust stability. The Mott-Schottky analysis reveals that the built-in electric field accelerates charge transfer and enhances the catalytic activity of RuO 2 /FeCo 2 O 4 .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Xinxin Wei,Jing Zhang,Lei Wang,Yan Bai,Jingwei Huang,Houde She,Qizhao Wang
To address the issue of inefficient charge transfer efficiency at the semiconductor/cocatalyst interface, we engineered a BiVO 4 /MgO/FeCo 2 O 4 array, incorporating a MgO interlayer. This design aimed to enhance the performance of photoelectrochemical (PEC) water splitting on BiVO 4 and FeCo 2 O 4 . The introduced interlayer efficiently hinders hole backflow, promoting unimpeded charge migration within the multi-hybrid structure. This, in turn, significantly reduces the recombination of electron-hole pairs. In addition, the BiVO 4 /MgO/FeCo 2 O 4 undergoes a low-temperature plasma treatment, resulting in super-hydrophilicity. This treatment enhances charge migration efficiency and fosters extensive contact between the electrolyte and electrode interfaces. Photoelectrochemical analysis demonstrates that H-BiVO 4 /MgO/FeCo 2 O 4 exhibits exceptional performance for the oxygen evolution reaction (OER), showcasing a photocurrent density of 4.3 mA·cm −2 at 1.23 V vs. RHE in 0.5 M Na 2 SO 4 under AM 1.5 G (100 mW·cm −2 ) illumination. Remarkably, this value is 5.2 times higher than that observed for BiVO 4 . Furthermore, the maximum incident photon to current conversion efficiency (IPCE) reaches an impressive 61.7 %, surpassing that of BiVO 4 and BiVO 4 /FeCo 2 O 4 by approximately 5.1 and 1.7 times, respectively. Additionally, the charge separation efficiency of H-BiVO 4 /MgO/FeCo 2 O 4 achieves a notable 83.4 %, and the charge injection efficiency is substantially improved. This study advocates for a straightforward yet highly effective approach to mitigate interfacial electron-hole recombination.
研究领域:
材料科学
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能源科学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2023
·Vol. 15
·期 15
·2856
·
IF 3.4
Jing Wang,Huanyu Zhou,Li Ma,Quanfeng Wang,Da Sun,Libo Jin,Guoming Zeng,Jujiao Zhao
Peroxymonosulfate (PMS) activation has gained increasing attention for its water remediation. In this work, carbon nanotube-supported FeCo2O4nanoparticles (FeCo2O4/CNT) were prepared and showed tremendous potential as a catalyst for PMS activation. The synergistic effect between FeCo2O4and CNT in FeCo2O4/CNT promotes its better catalytic performance than individual CNT or FeCo2O4. The synthesized FeCo2O4/CNT could reach 100% phenol removal with akvalue of 0.30 min−1within 15 min ([PMS] = 0.3 g L−1, [FeCo2O4/CNT] = 0.3 g L−1). FeCo2O4/CNT can adapt well to a wide pH range (4–9) and a complex water component (with inorganic ions or organic matter). Moreover, the catalytic mechanism investigation suggested that both radical and non-radical pathways are accountable for the efficient removal of phenol.Keywords:peroxymonosulfate;FeCo2O4/CNT;phenol removal
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
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2022
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IF 8.907
Tianfu Huang,Zehai Qiu,Zhibiao Hu,Zhusen Zhang
Transition metal oxides can serve as advanced electrode materials and have attracted extensive attention in the past decade. Herein, we have been successfully synthesized the FeCo 2 O 4 nanomaterials through a facile hydrothermal method followed by annealing treatment. The as-prepared FeCo 2 O 4 nanomaterials possessed a porous chopsticks-like microstructure, and the BET surface areas reached 85.32 m 2 g −1 . When the porous chopsticks-like FeCo 2 O 4 were used to make the working electrode, the three-electrode test system showed the ultrahigh specific capacitance of 679.94 F g −1 at current density of 1 A g −1 and a remarkable cycling stability with 93.68% capacitance retention being stable after 4000 cycles. Furthermore, the assembled porous chopsticks-like FeCo 2 O 4 // AC-ASC cell device exhibited a high energy density of 50.85 Wh kg −1 at a power density of 799.98 W kg −1 and still maintained 38.79 Wh kg −1 at a higher power density of 12,799.63 W kg −1 , and long cyclic stability, with almost 78.46% capacity retention after 5600 cycles. These results firmly verify that the porous chopsticks-like FeCo 2 O 4 nanomaterials have great potential application for supercapacitors.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2021
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IF 4.527
Jingtong Xie,Congmian Zhen,Lu Liu,Li Ma,Denglu Hou,Hanqing Pang,Dewei Zhao
A series of FeCo 2 O 4 powders was initially synthesized using a hydrothermal method and subsequently calcined at various temperatures to produce the final product. Pure phase FeCo 2 O 4 powders can only be formed in the temperature range of 950–1050 °C. In this work, we study the cation occupation, cation valence, bond length and bond angle changes of the pure phase FeCo 2 O 4 powders formed in such a narrow temperature range. Octahedral lattice distortion in the pure phase FeCo 2 O 4 samples has been observed. More tetrahedral Fe 3+ and octahedral Co 2+ are excited and exchanged their sites as the calcination temperature increases from 950 °C to 1000 °C, and part of Co 3+ ions are reduced to Co 2+ in the sample calcined at 1050 °C. The structure of the sample calcined at 1000 °C is close to that of the ideal FeCo 2 O 4 spinel. Magnetic measurements show that ferrimagnetism and anti-ferromagnetism coexist in the pure phase FeCo 2 O 4 samples. Interaction changes between ferrimagnetism and antiferromagnetism caused by the structural changes of the samples have been studied. Due to the pinning of the local anti-ferromagnetism to ferrimagnetism in the sample, the sample shows a Barkhausen jump below 150 K. As the measurement temperature increases further, the system enters into a reentrant spin glass state.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Huan Li,Chaoxiang Su,Chaoqi Wang,Zhe Lü
In this work, we report FeCo 2 O 4 - x Ce 0.8 Sm 0.2 O 1.9 ( x = 0, 30, 40, 50, 60, 70 wt%), catalyst/electrolyte composite oxides , as cathode materials for application in solid oxide fuel cells. Herein a systematic investigation represents the effect of Ce 0.8 Sm 0.2 O 1.9 incorporation on physical and electrochemical properties . The obtained results indicate that the addition of Ce 0.8 Sm 0.2 O 1.9 to form FeCo 2 O 4 –Ce 0.8 Sm 0.2 O 1.9 composite material plays a key role in physical and electrochemical properties. Among all the components, the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 composite cathode has the lowest polarization resistance of ∼0.094 Ω cm 2 at 800 °C in air, which is much smaller than that of the FeCo 2 O 4 cathode (4.18 Ω cm 2 ). In comparison with the FeCo 2 O 4 cathode, the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 composite cathode has a better electrocatalytic activity and a larger power density of 397 mWcm −2 based an electrolyte-supported single-cell configuration at 800 °C. The oxygen partial pressure dependence studies indicate that rate limiting steps of the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 composite cathode are the adsorption process of the molecular oxygen on the electrode surface and the charge-transfer process. In consequence of these superior properties, it is reasonable to believe that the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 oxide has great potential to become a cathode material for solid oxide fuel cells.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Bai-Hang Zhao,Bao-Yu Zhang,Bing-Lin Zhang,Jing Zhang,Chun Wang,Ye Li
The advanced oxidation process based on peroxymonosulfate (PMS) has obvious advantages in treating antibiotic wastewater, but finding a green, economical and feasible catalyst still be a key for its large-scale application. In this research, a rectorite-based metal material (FeCo 2 O 4 @C-REC) was synthesized by the sol-gel method, and its catalytic performance and mechanism were estimated by levofloxacin (LVX, a typical antibiotic substance) removal through activating PMS. A more than 80 % LVX removal efficiency can achieve in 10 min under the conditions of pH 6.8, catalyst dosage 0.4 g/L and PMS concentration 0.4 g/L. Liquid chromatography-mass spectrometer (LC-MS) and ECOSAR analysis showed 10 intermediates appeared in LVX degradation process, and the intermediates pose a minimal harm to the ecosystem. Quenching experiments and Electron Paramagnetic Resonance (EPR) analysis found OH and SO 4 − were the main reactive oxygen species (ROS) for LVX degradation. The redox between a large number of hydroxyl groups Co (iii)/Co (ii) and Fe (iii)/Fe (ii) on REC surface played an important role for activating PMS to produce ROS. Different water matrices experiments, cycle experiments, and metal ion leaching tests demonstrated FeCo 2 O 4 @C-REC had a good applicability and stability for activating PMS to degrade LVX. Our study may provide a new sight for catalyst large-scale application to remove antibiotic wastewater though PMS activation.
研究领域:
环境科学
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废水处理
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
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IF 3.806
Junjie Ding,Wenwen Zhao,Sen Liu,Hui Wang,Qiyu Mu,Zixu Huang,Yi Zhao,Guijing Liu,Ling Wang,Wenlong Xu
One of the effective ways to improve the electrochemical performance of supercapacitors is to fabricate a combined electric double layer capacitor (EDLC)-pseudocapacitance system. In this study, we synthesized the composite material FeCo 2 O 4 @PC by hydrothermal method , which can enhance the electrochemical performance of supercapacitors by the synergetic effect of EDLC and pseudocapacitance mechanisms. A series of physical characterizations including X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) were used to demonstrate the successful compositing of FeCo 2 O 4 @PC. And FeCo 2 O 4 @PC was used for the testing of supercapacitor and the electrochemical performance was evaluated by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD). The results show that the composite FeCo 2 O 4 @PC-5 possesses larger specific capacitance and excellent rate capability. This further confirms that the composite of the two materials can overcome their respective shortcomings and improve the overall capacitive performance of the electrode. The composite electrode material FeCo 2 O 4 @PC has great application potential and prospects in the field of supercapacitors.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganics
·
2024
·Vol. 12
·期 8
·229
·
IF 3.1
Zhouqian Chen,Zongmei Li,Manyi Zhang,Yujia Wang,Siang Zhang,Yuanyuan Cheng
FeCo2O4/MoS2binary composite catalysts were prepared by the hydrothermal method and calcination method. In this paper, the morphology and structure of the materials were characterized by means of SEM, EDS, XRD, and XPS. It was found that MoS2has high activity and good stability in HER, and and it has more prospect than noble metal catalysts. In oxygen evolution chemical kinetics, its rich redox potential allowed it to adsorb OH−on (Co2+/Co3+, Fe2+/Fe3+) and enhanced the activity of OER. The cross-nanosheet structure of the FeCo2O4/MoS2composite catalyst exposed more catalytic sites and accelerated charge transfer to achieve more efficient mass transfer. FeCo2O4/MoS2as an anode and cathode was assembled into a two-electrode system in overall water splitting, which showed good catalytic activity. When the composite ratio of FeCo2O4to MoS2was 1:0.3, the composite catalyst had the best catalytic activity. The results show that when FeCo2O4/MoS2is used as a cathode and anode to assemble an alkaline cell, respectively, the voltage for total water electrolysis is 1.59 V at a current density of 10 mA cm−2in a 1 M KOH electrolyte, it can keep good stability in a 10 h test with electrolyzed water, and its current retention rate is 98.5%.
研究领域:
材料科学
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电化学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2020
·Vol. 95
·期 12
·3202-3212
·
IF 2.75
Hejun Ren,Chenguang Li,Zhonghui Han,Tingting Li,Xiong Jin,Rui Zhou
BACKGROUND Metronidazole (MNZ) is a highly typical representative antibiotic widely occurring in wastewaters. Its release poses potential threats to the environment and human health. Advanced oxidation processes based on heterogeneous catalysis are promising technologies for organic matter removal. In this study, a new type of magnetic mesoporous FeCo 2 O 4 –Fe 3 O 4 microrods was prepared and evaluated as catalyst to activate peroxymonosulfate (PMS) for metronidazole (MNZ) degradation. RESULTS The effects of catalyst dosage, PMS concentration, and pH on MNZ degradation were investigated. A 96.8% removal of MNZ (100 mg L −1 ) was attained in the FeCo 2 O 4 –Fe 3 O 4 /PMS under the optimum conditions of 4 mM PMS, 0.4 g L −1 FeCo 2 O 4 –Fe 3 O 4 loading, pH 7 and 60 min reaction time. The hydroxyl radicals (•OH) and sulfate radicals (SO 4 •− ) were identified as the primary reactive species attributed to MNZ removal. The plausible mechanism of the catalytic degradation was proposed and assumed to be related to the Co/Fe species that exerted the synergistic effect during reactions. FeCo 2 O 4 –Fe 3 O 4 showed excellent reusability and stability, which was testified by the successive degradation experiments. More importantly, FeCo 2 O 4 –Fe 3 O 4 exhibited general applicability in eliminating various antibiotics, including ciprofloxacin, 2,4-dichlorophenol, ofloxacin, and tetracycline. The efficiencies of which were 78.8%, 77.1%, 81.3%, and 60.7%, respectively, under identical reaction conditions as MNZ. CONCLUSION This study proved that mesoporous FeCo 2 O 4 –Fe 3 O 4 microrods are efficient PMS activators and provided a novel strategy for developing FeCo 2 O 4 –based catalysts for the removal of organic pollutants from water. © 2020 Society of Chemical Industry
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Lei Zhao,Dan Yang,Lili Ma,Xueting Feng,Hanming Ding
It is a long-term goal to develop catalysts with high activity and stability in practical applications. Spinel FeCo 2 O 4 has been widely researched in heterogeneous catalysis due to its characteristics of stable structure and environmental friendliness. In this work, the composites of graphitic carbon nitride ( g -C 3 N 4 ) and spinel iron cobaltate (FeCo 2 O 4 ) have been fabricated and used to degrade rhodamine B (RhB) by combining the photocatalytic and Fenton-like reactions. The composite with 3% FeCo 2 O 4 (3%FeCo 2 O 4 /CN) showed the best degradation efficiency, with which about 98% RhB was degraded in 45 min. The catalytic activity of 3%FeCo 2 O 4 /CN was larger than that of FeCo 2 O 4 , g -C 3 N 4 , and their mechanical mixture. The synergetic interaction between photocatalytic and Fenton-like reactions and the effective separation of the photogenerated charges are responsible for the enhanced catalytic activity. The quenching and EPR experiments exhibit that SO 4 − , O 2 − , h + , and ΟΗ, especially SO 4 − , are involved in the removal of RhB. The cycle experiments confirm that the used catalyst can restore its catalytic activity after calcination at 400 °C. The work suggests that the composites show a good ability to degrade organic pollutants in wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2022
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IF 4.969
Yu Li,Cuicui Li,Jianyou Zeng,Ting Zhang,Jiachen Li,Zhaoqi Guo,Zhao Qin,Jianhua Yi,Fengqi Zhao,Haixia Ma
To improve the combustion performance of solid propellants relies on efficient combustion catalyst with large specific surface area and high density of active sites. In this work, three-dimensional ordered macroporous FeCo 2 O 4 (3DOM - FeCo 2 O 4 ) with four different pore diameters was successfully prepared using polymethyl methacrylate (PMMA) colloidal crystals as a template. Differential scanning calorimetry (DSC) study shows that 3DOM - FeCo 2 O 4 with a pore diameter of 176 nm has the best catalytic performance on the thermolysis of ammonium perchlorate (AP). The decomposition peak temperature and apparent activation energy were reduced by 116.5 ℃ and 26.1 kJ/mol, respectively. Thermogravimetry/mass spectrometry (TG/MS) was used to analyze the catalytic mechanism. The result indicates that 3DOM-FeCo 2 O 4 can accelerate the electron transfer from ClO 4 – to NH 4 + to form HClO 4 and NH 3 and the transformation from O 2 to superoxide ion(O 2 – ), thus providing active sites for intermediate products of AP and catalyzing the decomposition of AP. Furthermore, the heat release and ignition tests of thermites using 3DOM-FeCo 2 O 4 as the oxidant were carried out. The thermite with a pore diameter of 215 nm exhibits higher heat release and better ignition characteristic compared to the thermites with other pore diameters.
研究领域:
材料科学
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燃烧化学
✓ 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）