JOURNAL OF APPLIED PHYSICS
·
2019
·Vol. 126
·期 6
·
IF 2.328
Zhang Huazhang,Zhou Jing,Shen Jie,Yang Xiong,Wang Tianheng,Xiang Guanglei,Wei Quan,Chen Wen
Electrically and thermally induced transitions between ferroelectric and relaxor states are of great importance for Bi 1/2 Na 1/2 TiO 3 (BNT)-based materials because of their close relevance to electromechanical properties. In this study, the electric field-temperature ( E - T ) phase diagrams of Fe doped Bi 1/2 (Na 0.8 K 0.2 ) 1/2 TiO 3 (BNKT) ceramics are constructed via an experiment and theory combined approach. A novel phenomenological model based on the Landau-Devonshire theory and the Preisach model is proposed to describe the electric field induced phase transitions. Using this model, an approximate free-energy landscape is obtained by fitting the experimental double polarization-electric field loop, and then the electric field representing ferroelectric and relaxor two-phase equilibrium is calculated from the free-energy landscape for the construction of an E - T phase diagram. The constructed E - T phase diagrams meet basic thermodynamics requirements, for example, the Clausius-Clapeyron relation, and, therefore, overcome some of the shortcomings of previously reported E - T phase diagrams for BNT-based ceramics. The relationship between the E - T phase diagram and electromechanical properties is also established. From the E - T phase diagrams, it is predicted that Fe doping could lower the threshold field of triggering giant strains of BNKT ceramics at a high temperature. This prediction is successfully verified by experimental measurement of the electric field induced strain. At the optimized temperature for strain property, the threshold field of triggering giant strain is estimated to be about 2.6 kV/mm for a 3.0% Fe doped sample, significantly lower than 3.5 kV/mm for the undoped sample. This shows that the E - T phase diagram can provide valuable guidance for the improvement of electromechanical properties of BNT-based ceramics.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Hao Wang,Xiaohao Liu,Guangyue Xu,Ziwei Guo,Ying Zhang
ABSTRACT Owing to Fe being the most abundant and least expensive transition metal on the earth, the utilization of Fe-based catalysts for catalytic hydrogenation has attracted worldwide attention. In this work, a series of N-doped C supported Fe catalysts (Fe-N-C) were prepared by co-pyrolysis of cellulose and ferric chloride under ammonia atmosphere. Characterization methods such as elemental analysis, atomic absorption spectroscopy, nitrogen adsorption-desorption isotherms, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were carried out to explore the physicochemical properties of the catalysts. Using hydrogenation of nitrobenzene as a model reaction, the catalysts prepared at different pyrolysis temperatures displayed different activities. Fe-N-C-700 exhibited the best activity among these catalysts, with the yield of aniline being up to 98.0% under 5 MPa H 2 at 120 °C after 12 h. Combined with the results of catalyst characterization and comparative tests, the transformation of Fe species and the generation of N-doped C, especially graphitized N-doped C, in the catalyst may be the main factors affecting the activity. A kinetic study was carried out and the apparent activation energy was obtained as 31.53 kJ/mol. The stability of the catalyst was also tested and no significant decrease in the activity was observed after 5 runs.
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高影响因子
RSC Advances
·
2020
·Vol. 10
·期 14
·8055-8065
·
IF 3.119
Wenpeng Han,Shanmin Wang,Xuekuan Li,Ben Ma,Mingxian Du,Ligong Zhou,Ying Yang,Ye Zhang,Hui Ge
The effect of Fe, Co and Ni promoters on supported MoS2 catalysts for hydrogenation of nitroarenes were systematically investigated via experiment, characterization and DFT calculation. It was found that the addition of promoters remarkably improved the reaction activity in a sequence of Ni > Co > Fe > Mo. Meanwhile Ni promoted catalyst with the best performance showed good recyclability and chemoselectivity for a wide substrate scope. The characterization results revealed that the addition of promoters decreased the interaction between Mo and support and facilitated the reductive sulfidation of Mo species to produce more coordinated unsaturated sites (CUS). DFT calculations showed that the addition of promoters increased the formation of CUS, and enhanced the adsorption of hydrogen. The influence degree of promoters followed the sequence Ni > Co > Fe > Mo, which was consistent with those of the activities. Nitrobenzene hydrogenation and hydrogen activation occurred at the S and Mo edge, respectively. The adsorbed hydrogen diffused from the Mo edge to the S edge to participate in the hydrogenation reaction. Mechanism investigation showed that the main reason for increased activity by the addition of promoters was the increase of amounts of CUS and the secondary reason was the augmentation of intrinsic activity of CUS. The present studies give a new understanding for promoter modified MoS2 catalysts applied for hydrogenation of nitroarenes.
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高影响因子
ACS Catalysis
·
2020
·
IF 12.35
Xiaoli Yang,Ruifeng Wang,Jia Yang,Weixin Qian,Yaru Zhang,Xuning Li,Yanqiang Huang,Tao Zhang,De Chen
Direct conversion of syngas into aromatics with tandem catalysts containing Fe-based Fischer–Tropsch synthesis (FTS) catalysts and zeolites has been attracting significant attention because of the great cost-efficiency. However, the interaction role between two active species and reaction paths are still unclear. We report here that a high yield of aromatics was achieved by serial reactions directly from syngas on a Na-Fe-ZrO2/ZSM-5 tandem catalyst. Results point out significant impacts of zeolite in the catalytic system on performance including activity and selectivity. The role of the zeolite on reaction pathways about both CO conversion and aromatic formation has been systematically investigated by steady-state isotopic transient kinetic analysis and designed experiments. The presence of zeolite in the catalytic system promotes the CO hydrogenation rate by means of improving the iron carburization degree, possibly because of the enhanced CO adsorption and the formation of surface intermediates. It also enhances selectivity to aromatics by coupling CO to participate in the olefin transformation on ZSM-5. In addition, the formation rate of aromatics is proportional to the number of Lewis acidic sites, suggesting the dehydroaromatization route as the main mechanism of olefin aromatization. These findings provide some insights into the effect of ZSM-5 on reaction paths over the FTS catalyst–zeolite tandem catalyst system.
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高影响因子
FUEL
·
2019
·
IF 5.128
Tengfei Yang,Congcong Liu,Chuan Li,Liyong Gan,Wenan Deng,Qingshan Niu
Nickel sulfide is regarded as one of the most promising substitutes for the best-performing disposable molybdenum catalyst in the hydrogenolysis of lignite and heavy residue, but its practical application is hindered severely by insufficient catalytic activity and a prohibitively large dosage. Herein, we report that the issues of activity and cost of nickel sulfide can be addressed simultaneously by employing a combination of iron incorporation and a dispersing strategy via oil-soluble ligands. Motivated by first-principles calculations where iron incorporation in nickel sulfide would lead to a better activity towards the rate-limiting step of hydrogenolysis compared with nickel sulfide alone, we successfully prepared a well-dispersed Fe-Ni-S catalyst by coordinating active metal salts with carboxylate ligands and a subsequent essential sulfurization. The synthesized Fe-Ni-S catalyst outperformed not only the monometallic nickel catalyst but also the commercial molybdenum catalyst in the hydrogenolysis of lignite and heavy residue, and exhibited a high conversion efficiency, hydrogen consumption, hydrogen/carbon product atomic ratio, and dispersibility of solid residues, with an economic nickel dosage of as low as ~250 μg·g −1 . Structural changes of raw coal and solid residues further confirmed the role of the Fe-Ni-S catalyst in facilitating the hydrogenolysis of lignite and heavy residue.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 7
·077512
·
IF 4.386
Wenhuang Xiao,Xiaolin Zhao,Luyin Lin,Jian Luo,Haipeng Yang
Sarcosine has been discovered as a better potential biomarker for Prostate cancer (PCa). Though many high-performance amperometric sarcosine biosensors have been reported, it is still difficult to accurately detect sarcosine because of the extremely low concentration and the presence of many electroactive interferents in human serum or urine. Since most of the reported sarcosine biosensors use platinum group metals (PGM) as catalysts, it is meaningful to explore other catalysts with higher catalytic activity. Metal-nitrogen-doped carbon (M–N–C) materials are considered as alternatives to precious metals. In this study, iron doped zeolitic-imidazolate-framework-8 (ZIF-8) composites were synthesized and calcined to obtain an Iron-nitrogen-doped Carbon (Fe–N–C) material, which has excellent catalytic activity. The sensitivity of the Fe–N–C modified sarcosine biosensor is 16.5 μA mM−1, (234.2 μA mM−1 cm−2), which is the highest one in recent reported works. It has a low limit of detection (LOD, 0.7 μM, S/N = 3), and an appropriate linear detection range of 2–37 μM. This work provides a new approach to prepare high performance sarcosine biosensors by improving the catalytic activity of the modifier of the sensor. It has great potential to be used as portable devices for the rapid detection of PCa.
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高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Zenghua Xu,Ximing Zhang,Kai Li,Hongjian Lin,Xiangqun Qian,Kuichuan Sheng
Designing low-cost and sustainable electrode materials for energy storage devices with large energy density and capacitance is still a formidable challenge. Herein, a green, template-free, and facile Fe-decorated porous carbon synthesis strategy derived from bamboo was proposed. This strategy includes hydrothermal carbonization pretreatment, which can tune the carbon morphology and dope iron elements in one step, and a mild KHCO3 activation to improve porosity while retaining the spherical morphology. The optimized Fe-decorated porous carbon exhibited a high surface area (1509.5 m2 g–1) with a carbon sphere/nanosheet architecture, which is beneficial for ion/electrolyte diffusion and increasing the accessibility between the surface area and electrolyte ions. Moreover, the introduced Fe oxides can provide extra pseudocapacitance, which comes from the reversible faradaic reaction between Fe3+ and Fe2+. The resulting carbon material presented a high capacitance of 467 F g–1 at 0.5 A g–1. The assembled KOH-based symmetric supercapacitor displayed a superb cycling performance that can output 99.8% of the initial capacitance after 5000 cycles, and the Na2SO4-based device showed the maximum energy density of 20.31 W h kg–1. Meanwhile, different behaviors in different electrolytes were further analyzed. This work demonstrated that the modification of hydrochar is an effective way to convert biomass into high-performance electrode materials, which has potential for advanced storage device applications.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Yue Zhang,Gang Li,Qiuyu Guo
A series of composites based on Fe-based MOF (Fe-BDC) and CdSe quantum dots (CdSe QDs) have been synthesized with CdSe QDs well-embedded into Fe-BDC particles, which are characterized by XRD , SEM, TEM, ICP-OES, FT-IR, N 2 physical sorption , UV–visible DRS , PL and electrochemical measurements. By detecting the degradation of Rhodamine B (RhB) in aqueous solution under visible light irradiation, the photocatalytic performance of CdSe@Fe-BDC nanocomposites were apparently improved by 5.8 times relative to single Fe-BDC, which can be attributed to the heterostructure formed in CdSe@Fe-BDC. Owing to the perfect interfacial contact, this promotes electron transfer from CdSe to Fe-BDC and significantly facilitates the separation of the photogenerated electron-hole pairs. The photocatalytic mechanism studied by adding sacrificial agents revealed that the predominant active species in the system is hole cation (h + ) and oxygen free radicals (•O 2 − ).
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高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Miao Wang,Donghui Xu,Ying Zhang,Jie Zhou,Zhihao Lin,Yiming Zhao,Xin Ding,Bin Sheng,Xiaobin Wen,Xiao Song,Ge Chen,Xiaomin Xu,Xin Yang,Guangyang Liu
The application of ZIF nanomaterials as controlled release agents for pesticides holds significant promise in enhancing pesticide utilization efficiency, prolonging their effectiveness, and minimizing pesticide residues. However, the loading efficiency of single ZIF is limited and susceptible to external stimuli. Therefore, in order to improve the loading rate of the material and enhance the bioavailability of the pesticide, a novel porous nanocarrier (MPN (Fe) @ZIF-8) was prepared for loading the neonicotinoid pesticide thiacloprid (THIA) by combining the biocompatible material metal polyphenol network (MPN) with ZIF-8 using the co-precipitation method and layer-by-layer self-assembly strategy. Through the selection of carrier materials and optimization of loading conditions, MPN (Fe) @ZIF-8 with irregular coral-like structure was obtained, which had high specific surface area (82.15 m 2 /g) and excellent load ratio (18.93 %). In addition, with the aim of preventing pesticide leakage, polyethyleneimine (PEI) was added to the nanocarrier system as a sealing agent, and porous ZIF nanopesticides with pH-responsive properties (MPN (Fe) @ZIF-8@THIA@PEI) were prepared. In vitro release experiments showed that MPN (Fe) @ZIF-8@THIA@PEI favoured the release of THIA (72.33 % cumulative release) under alkaline conditions (pH = 8.6), whereas it was delayed (42.24 % cumulative release) under acidic conditions (pH = 3.6). It was noteworthy that MPN (Fe) @ZIF-8@THIA@PEI has a higher lethality rate (89.04 %) against B. tabaci than commercial THIA reagents (66.67 %). Furthermore, after 8 h of UV irradiation, the residual pesticide in the commercial THIA reagent was only 11.27 %, while that in MPN (Fe) @ZIF-8@THIA@PEI remained at 73.98 %. Hence, this work provides new ideas for the development of green and environmentally friendly stimuli-responsive porous controlled release agents.
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产品关联
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Ying Huang,Tiantian Liu,Ying Xiong,Qian Wen,Wang Li,Jiali Ren,Haiyan Zhong
The rapid discrimination and detection of pesticide residues represent a critical strategy for mitigating food safety risks associated with pesticide contamination. We designed and synthesized three distinct iron-based metal-organic frameworks (Fe-MOFs) nanozymes incorporating varied organic ligands. Owing to the differential modulation of their peroxidase-like activity by different pesticides, a facile yet efficient three-channel sensing array was constructed using these Fe-MOF nanozymes, allowing for the simultaneous discrimination of five pesticides (the minimum distinguishable concentration was 1 μg/mL). By converting pesticide-specific response signals into fingerprint profiles and subjecting them to analysis, including linear discriminant analysis and hierarchical cluster analysis, we achieved the classification of diverse pesticide species. Notably, the sensing platform exhibited good discriminative capability even for complex pesticide mixtures and real samples (corn and oat). This approach established a reliable and efficient strategy for pesticide screening, offering significant potential for enhancing food safety monitoring and safeguarding public health.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 31
·1-22
·
IF 2.8
Guo Yiting,Hao Jingyi,Wang Tian,Su Shen,Yang Shuangshuang,Wang Xingwei,Yu Qiangliang
To investigate the electromagnetic wave absorption performance of electromagnetic-regulated materials and copolymerized composite aerogels with polymer materials, this study loaded nano-Fe 3 O 4 onto modified CNTs through a hydrothermal reaction. The resulting material was then added to a prepolymer solution of acrylic acid and acrylamide monomers for copolymerization, followed by the preparation of composite aerogels using freeze-drying technology (Fe 3 O 4 -CNTs/P(AA-AM)). The influence of the addition amount of nano-Fe 3 O 4 -loaded modified CNTs on the electromagnetic wave absorption performance of the composite aerogels was systematically studied. Notably, the Fe 3 O 4 -CNTs/P(AA-AM)-5 aerogel exhibited the optimal wave-absorbing performance, achieving a minimum reflection loss of −35.5 dB and an effective absorption bandwidth of 5.04 GHz below −10 dB. This is primarily attributed to the excellent dual electromagnetic loss of Fe 3 O 4 -CNTs and the multiple reflection, polarization, and relaxation processes induced by the three-dimensional conductive network constructed within the aerogel skeleton. The performance relationships revealed in this study are of significant importance for the design and preparation of polymer aerogels with effective electromagnetic wave absorption capabilities.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Dongdong Liu,Shun-xin Chen,Runkai Wang,Lin Li,Jiangyan Ji,Tong Wu,Kunlin Ke,Fei Chai
Enrofloxacin (ENR), characterized by its remarkable stability and resistance to degradation, has become a significant contaminant in aquatic ecosystems. In this study, a CNC/UiO-66(Fe) composite was synthesized via a one-step hydrothermal method, and response surface methodology (RSM) was employed to optimize the key experimental conditions for the efficient removal of ENR from aqueous solutions. The incorporation of cellulose nanocrystals (CNC) improved the dispersibility and stability of UiO-66, and significantly enhanced the crystallinity of the material, as confirmed by XRD analysis. Iron (Fe) doping introduced additional active sites and defects, synergistically enhancing the overall adsorption capacity. The composite exhibited a high BET surface area of 1294.81 m 2 /g and a well-developed porous structure. The adsorption process was spontaneous and exothermic, fitting well with both the pseudo-second-order kinetic model and the Langmuir isotherm model. Under alkaline conditions, the material showed excellent adsorption performance, with a theoretical maximum adsorption capacity of 275.84 mg/g for ENR at 25°C and pH 10. The adsorption mechanism involved multiple synergistic interactions, including electrostatic attraction, hydrogen bonding, π-π stacking, metal coordination, and pore filling. Furthermore, CNC/UiO-66(Fe) exhibited excellent stability and reusability, retaining over 80% of its removal efficiency after five cycles. This study provides an effective and sustainable approach for remediating antibiotic contaminants in aquatic environments.
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DOI
PubMed
高影响因子
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