JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2020
·
IF 2.717
Wentao Hu,Xi'an Fan,Zigui Luo,Fan Luo,Guangqiang Li,Jian Wang
In this work, Fe/ZnO soft magnetic composite (SMC) is prepared successfully by sol-gel method combined with a pyrolysis process. Formation mechanism and effect of annealing on magnetic properties for the Fe/ZnO SMCs are studied in detail. The results show that Fe/zinc acetate hydrogel mixture will be decomposed into the Fe/ZnO composites by heating above 340 °C. And ZnO is well coated on the surfaces of Fe particles. The Fe/ZnO composite compact has lower total core loss and better frequency stability of magnetic permeability compared with pure Fe compact. In addition, annealing treatment shows an enhanced effect on the magnetic properties for the Fe/ZnO composite compact such as reduced coercivity and increased permeability. The annealed Fe/ZnO SMCs can keep stable magnetic permeability (26) from 50 Hz to 10 kHz, high magnetic induction (1.65 T) and a relatively low core loss of 91.11 kW/m 3 measured under a magnetic flux density of 30 mT at 10 kHz. Therefore, the Fe/ZnO soft magnetic composites prepared by the above-mentioned method provide a great potential application in electromagnetic conversion equipment.
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高影响因子
Energy Technology
·
2020
·Vol. 8
·期 5
·2000008
·
IF 3.404
Chengrui Wang,Lei Zhang,Yuhai Dou,Luke Hencz,Lixue Jiang,Mohammad Al-Mamun,Porun Liu,Shanqing Zhang,Dan Wang,Huijun Zhao
Further commercial application of low-cost NiO-based anodes is hindered by their large volume expansion after full lithiation and relatively poor theoretical capacity. To improve these issues, transition metal (Fe, Co, or Mn)-modified triple-shelled NiO microspheres (TS-NiO) are successfully synthesized by using a hard template double-adsorption method. Among them, the Fe-modified TS-NiO (TS-NFO) exhibits an extraordinary lithium storage ability with high reversible capacity and outstanding cycling stability (2061.1 mAh g −1 after 800 cycles at 0.5 A g −1 ), which is the highest performing nickel oxide-based anode reported to date. The outstanding electrochemical performance of TS-NFO can be ascribed to its unique triple-shelled structure. The inner core of TS-NFO is composed of NiO and is encapsulated by two outer shells which are composed of a mixture of α-Fe 2 O 3 and NiFe 2 O 4 , resulting in a unique hollow triple-shelled structure (NiO@α-Fe 2 O 3 /NiFe 2 O 4 ). The void space between the triple shells leaves room for their volume changes during lithiation/delithiation, which improves the cycling stability. In addition, the introduced α-Fe 2 O 3 /NiFe 2 O 4 outer shells increase the energy density and reversible capacity due to a synergistically interactive effect.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yingjie Guo,Zhongke Wang,Yuyang Wang,Lixia Ma,Nan Zhang,Ruibin Jiang
The development of nonprecious metal-based electrocatalysts for oxygen reduction reaction (ORR) is a central task in renewable electrochemical energy conversion and storage technologies. Iron-nitrogen doped carbon-based (Fe−N/C) materials are promising alternatives to Pt-based ORR electrocatalysts. Owing to large specific surface area and outstanding electrical conductivity, carbon black is an inborn support for electrocatalysts. Unfortunately, the direct incorporation of Fe−N x moieties onto the surface of carbon black has not been realized to date. Herein, Fe−N x moieties are directly incorporated onto the surface of carbon black through surface modification and the following Fe and N co-doping. The obtained Fe and N co-doped carbon back (Fe−N/CB) catalyst has very large specific surface area and abundant accessible Fe−N x moieties. As a result, Fe−N/CB electrocatalyst exhibits a more positive half-wave potential (0.86 V) than Pt/C. The Fe−N/CB catalyst also displays better stability and methanol resistance than Pt/C. The Zn-air battery with Fe−N/CB as cathodic catalyst shows a maximum power density of 68 mW cm −2 and a specific capacity of 676 mAh g Zn -1 . Our finding provides a convenient and low-cost approach to fabricating efficient M−N/C-based catalysts and will be helpful to the development of renewable electrochemical energy conversion and storage technologies.
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PubMed
高影响因子
CHEMOSPHERE
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2021
·
IF 7.086
Yu Li,Yong Feng,Bin Yang,Zequn Yang,Kaimin Shih
The activation of persulfate by ferrous iron (Fe(II)) is of great interest to the environmental remediation community, but the reduction of ferric iron (Fe(III)) to Fe(II) is slow and the accumulation of iron sludge resulted from the precipitation of Fe(III) is a great concern. Here, molybdenum disulfide (MoS 2 ) was studied as a co-catalyst to improve the activation of peroxymonosulfate (PMS) by Fe(III) for sulfadiazine (SDZ) degradation and different characterization technologies were used to reveal the reactive species. The results showed that a strong synergy existed between MoS 2 and Fe(III); approximately 94.3% of the SDZ was removed by MoS 2 -Fe(III)-PMS after reaction for 30 min, while only 8.5% and 56.4% of the SDZ was removed by Fe(III)-PMS and MoS 2 -PMS, respectively. Both hydroxyl radicals and sulfate radicals were generated and the latter was the primary species. In addition to the radicals, singlet oxygen was found to be generated and contributed to the degradation of SDZ. The chemical probe reaction with methyl phenyl sulfoxide showed that the generation of high-valent iron-oxo species was not obvious by MoS 2 -Fe(III)-PMS under both acidic and neutral conditions. MoS 2 had good stability. No noticeable deactivation was observed during the 1st to 5th run and no obvious oxidation of surface Mo(IV) occurred. Based on the characterization of catalyst and oxidizing species, a mechanism for the activation of PMS by MoS 2 -Fe(III) was proposed. The results from this study are expected to clarify the reactive species and deepen the understanding of MoS 2 -promoted persulfate activation by Fe(II)/Fe(III).
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Xuan Bie,Kai Wu,Kunling Jiao,Kun Zhao,Xiangyang Chen,Suangchen Ma
Generally, using transition metal oxides as catalysts is the typical method for ammonia-selective catalytic reduction (NH 3 -SCR) under the medium temperature zone (150–400 °C). The controllable structure and uniformly distributed active sites of (Fe&Mn)AlOx-based catalysts via a facilely operative and green prepared method were employed for high NO catalyzed efficiency and selectivity . Among them, the Mn 1.2 Al 0.8 O x sample exhibited excellent low-temperature activity, and Fe 1.2 Al 0.8 O x exhibited excellent N 2 selectivity, which could be ascribed to the unique surface feature (more redox sites on Mn 1.2 Al 0.8 O x and more acid sites on Fe 1.2 Al 0.8 O x ). This creative work has directly demonstrated the importance of coordination between the adsorption of species and electron transportation that emerged on active sites. Meanwhile, the reaction process has been clearly presented in in-situ DRIFTS, declaring the synergetic mechanism (Eley-Rideal mechanism and Langmuir-Hinshelwood mechanism) in the systems. The Eley-Rideal mechanism could be the dominant one due to its rapid reaction rate. The predictable insights are beneficial for profoundly understanding the dual-sites synergetic interaction for controllable conversion rate and high selectivity in the medium temperature SCR process.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Ruihao Tang,Wei Hong,C. Srinivasakannan,Xuelin Liu,Xin Wang,Xinhui Duan
Silica aerogel and Fe doped silica aerogel composite were synthesized by sol–gel method adopting ambient pressure drying method. The crystal structure, surface morphology, pore structure, surface functional groups and elemental composition of silica aerogel prepared with different concentrations of Fe 3+ were characterized by XRD, SEM, TEM, BET, FTIR, XPS and Zeta potential analysis. The specific surface area of the composite aerogel was found to decrease with the increase addition amount of FeCl 3 . The optimal composite aerogel adsorbent had a surface area of 240 m 2 /g with well-developed mesoporous network, which possessed a maximum malachite green(MG) adsorption capacity of 1592 mg/g, as compared to virgin silica aerogel of 1250 mg/g. Adsorption capacity for large molecules like MG is very low for the most popular adsorbent such as high surface area activated carbon, which is usually the first-choice adsorbent for wastewater treatment. Such high adsorption capacitiy of the silica aerogel composite is highly promising as it is on the classification of low-cost adsorbents, which can serve to be far better alternative for waste water treatment applications.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2019
·Vol. 166
·期 15
·B1594
·
IF 3.12
Huiming Tian,Bing Tan,Xueming Dang,Huimin Zhao
Detecting hydrogen peroxide (H2O2) is obviously indispensable on account of its low toxicity and wide application, and it is still a challenge for developing highly sensitive and selective electrochemiluminescence (ECL) sensors based on the noble metal-free electrode. Hence, we designed an accurate ECL sensor for detecting trace H2O2 based on N-doped porous carbon containing Fe (Fe/N-C) nanocomposites, which were successfully synthesized by pyrolysis of NH2-MIL-101(Fe) metal-organic framework (MOF). Fe/N-C nanocomposite significantly improved the electron transfer process and enhanced the catalytic activity of ECL sensor for trace H2O2 detection. Fe/N-C nanocomposite significantly contributed in the conversion of H2O2 to superoxide radical, followed by the oxidation of luminal which enhanced the electrochemical luminescence signal. Predictably, the ECL sensing strategy at Fe/N-C nanocomposite electrode showed a satisfying linear range from 1 nM to 300 nM for H2O2 detection with limit of detection (LOD) as 0.93 nM (signal to noise ratio (S/N) = 3). Also, the ECL sensor was used to detect H2O2 in real water samples and renal epithelial 293T cells, which justified great promise for the practical ECL detection of H2O2.
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高影响因子
Food Bioscience
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2019
·
IF 3.22
Biao Yuan,Cong Zhao,Chen Cheng,De-chun Huang,Shu-jie Cheng,Chong-jiang Cao,Gui-tang Chen
Grifola frondosa protein was hydrolysed using Alcalase, and the resulting hydrolysates (CGFP) were filtered using 5 and 1 kDa nominal cut-off ultrafiltration membranes and separated using Sephadex gel chromatography . Two main fractions, named GFP-1 and GFP-2 were obtained. CGFP-Fe and GFP-Fe were synthesized using ferrous chelation. Results showed that the GFP-2 fraction with molecular weight of 963 Da had the highest Fe(II) chelating activity (2680 ± 40 μg/g). UV spectrum showed that the Fe(II) shifted the maximum absorption to shorter wavelengths. The peptides measured using FTIR showed that the GFP-Fe peptide and the un-chelated peptide had different C–O and C= O absorption peaks. The effects of CGFP, CGFP-Fe, GFP2-2 and GFP-Fe on splenocytes proliferation and cytokines secretion were studied in vitro . Both the GFP-2 and GFP-Fe had good immune-enhancing activity. Furthermore, GFP-Fe showed an ability to promote the proliferation of splenocytes and peritoneal macrophages. The iron-chelating peptide of Grifola frondosa still maintained its immune enhancing activity after in vitro gastrointestinal digestion. The results suggested that GFP-Fe might be beneficial as a new iron supplement and as an immunological enhancement .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Yunfei Zhang,Junfeng Niu,Jianhui Xu
In this study, it was demonstrated that the Fe ion was an effective promoter of bulk MoS 2 for the activation of peroxymonosulfate (PMS) to degrade acetaminophen (ACT). ACT removal rate constant in the presence of 5 mg/L FeSO 4 ·7H 2 O (0.1099 min −1 ) was approximately 20 times as that in the absence (0.0045 min −1 ) with 0.1 g/L MoS 2 of FeSO 4 ·7H 2 O at pH 0 3. Both electron paramagnetic resonance (EPR) characterization and quenching experiment suggested the key role of singlet oxygen ( 1 O 2 ), acting as dominant reactive species responsible for ACT degradation in the Fe 2+ /MoS 2 /PMS system. Besides, the chemical state and composition of MoS 2 , the ion (Fe and Mo) concentrations and the speciation of Mo(VI) were investigated. Results suggested that the promoting effect of Fe(II) ion originated from the regeneration of Fe 2+ mediated by MoS 2 , and the formation of molybdenum(VI) peroxo complex species in Fe 2+ /MoS 2 /PMS system. The present study not only provides an insight into PMS activation by MoS 2 accelerated by Fe(II) ion, but also suggests an high-efficiency, easy-to-handle and environmentally friendly method to treat refractory wastewater.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 30
·期 6
·1908365
·
IF 15.621
Xiaoyan Chen,Huilin Zhang,Meng Zhang,Peiran Zhao,Ruixue Song,Teng Gong,Yanyan Liu,Xinhong He,Kuaile Zhao,Wenbo Bu
Chemodynamic therapy (CDT) by introducing the Fenton-/Fenton-like reaction in an acidic and H 2 O 2 environment for toxic hydroxyl radical (•OH) generation, is a newly developed tumor-selective therapeutic. However, tumor acidosis, characterized by extracellular acidity (pH e ≈ 6.5) and intracellular alkalinity (pH i ≈ 7.2), undoubtedly confers a large chemical barrier for effective implementation of intracellular CDT and thus limits its functional activity and therapeutic efficacy. Here, the unique amorphous iron nanoparticles (AFeNPs) loaded with carbonic anhydrase IX inhibitor (CAI) are constructed to re-establish tumor acidosis with decreased pH i and increased pH e via inhibiting the over-expressed CA IX in cancer cells by CAI for self-enhanced CDT. The suppression of CA IX leads to H + accumulation in cells that could accelerate the AFeNPs-based Fenton reaction to drastically exacerbate oxidative stress in cells and subsequently induce cell death; meanwhile, the inhibition of H + formation outside cells efficiently represses the potential of tumor invasion and metastasis owing to the insufficient acidic ions for degradation of tumor extracellular matrix. Re-established tumor acidosis not only assists in the optimization of CDT, but also presents an opportunity for the development of new antitumor methods that are more tumor-acidity specific.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Mengya Guo,Li Wang,Yuying Gao,Guozhu Li
Doping carbon materials with Fe and N attracts great attention due to its promising application in preparing ORR electrode with high performance and low cost. Previously, Fe, N-codoped catalyst (Fe/N/C) had been synthesized via a simple one-pot method using carbon materials, dopamine and FeCl 3 by our group. However, the unstable activity and low selectivity (electron transfer number of ∼3.5) are key problems that should be solved. Herein, trace sulfur has been introduced into Fe, N-codoped carbon black by using 2-mercaptoethanol as an adhesive sulfur precursor. By the doping of trace S atoms (∼0.25 at%) into Fe, N-codoped carbon frameworks, the ORR performance has been obviously improved simply without any re-treatment process, such as acid-etching or nitrogen supplement. The mechanism of this process has been systematically investigated by changing the amount of initial sulfur precursor. A moderate amount of trace sulfur can effectively enhance the ORR performance of Fe, N-codoped carbon black due to suitable interactions among Fe, N, S and C elements. Both the content and the state of Fe and N species on the surface of carbon black can be changed and controlled by trace sulfur. The as-synthesized 1.0 S Fe/N/C catalyst exhibits a good ORR activity (E 1/2 = 0.749 V, J k = 54.56 mA cm −2 ) and a total 4-electron selectivity. 1.0 S Fe/N/C also shows better catalytic stability and methanol tolerance than 20 wt% Pt/C.
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高影响因子
CHEMICAL GEOLOGY
·
2019
·
IF 3.618
Ying Wang,Xiu Yuan,Xiaomin Li,Fangbai Li,Tongxu Liu
Cytochrome c ( c -Cyts), as a key protein involved in extracellular electron transfer , plays an important role in the microbial Fe(II)-oxidizing process. In this study, due to their similar structure with the outer membrane protein of microorganisms , the equine c -Cyts was employed as a model protein to examine the impact of different organic ligands on the redox kinetics between Fe(II) and c -Cyts using the rapid stopped-flow spectrometer. Our results suggest that the presence of organic ligands will significantly accelerate the reaction between c -Cyts and Fe(II), with reaction rates obtained in the following order: EDTA > citric acid (Cit) > NTA > malonic acid (Mal) > glycine amino acid (Gly) > acetate acid (Ace) > control. It was also found from the kinetic modeling results that the reduction rate of c -Cyts by Fe(II)-ligands was closely correlated to the complex constant between Fe(II) and each ligand, and the reduction rate constants of c -Cyts by Fe(II)L species (L represents “ligands”). Further analysis on the ligand structure indicates that the reaction rate constants are highly correlated with the complex constants of Fe(II)-ligand and the reduction rate constants of c -Cyts by Fe(II)L species ( k 3 ) for Group I (Gly, NTA, and EDTA) and Group II (Cit, Mal, and Ace). The results of midpoint potentials of all Fe(II)-ligands obtained through cyclic voltammetry (CV) experiments were ranked as Ace < Gly < NTA < control < Mal < EDTA < Cit, indicating that the redox potentials of Fe(II) complexes in the same group with similar structures were positively correlated with Fe(II)-ligand complex constants. The reorganization energy change of the electron-transfer reaction resulting from the different Fe(II)-ligand structures may contribute significantly more than does the Gibbs free energy (Δ G ) to the reaction kinetics of Fe(II)-ligand and c -Cyts.
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