Journal of Nanomaterials
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2016
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IF 1.758
Minpeng Liang,Jianxin Zou,Xiaoqin Zeng,Wenjiang Ding
In the present work, a method combining arc plasma evaporation of a metal followed by oxidation in air was developed to produce nanosized metal oxide based composites in large scale. As an example, Fe2O3 based nanocomposites were prepared through such a method. With increasing the oxidation temperature, α-Fe2O3 content in the composites increases, while γ-Fe2O3 and residual α-Fe contents decrease. As anode materials for lithium batteries, the electrochemical properties of nanosized Fe2O3 composites were tested. It was found that the anode materials changed to tiny crystallites and then followed by grain growth during the galvanostatic charge/discharge cycles. A capacity rising was observed for the composites obtained at 400°C and 450°C, which was more prominent with increasing the oxidation temperature. Among these composites, the one obtained at 450°C showed the best performance: a specific capacity of 507.6 mAh/g remained after 150 cycles at a current density of 200 mA/g, much higher than that of the commercial nano-Fe2O3 powder (~180 mAh/g after 30 cycles).
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ACS Sustainable Chemistry & Engineering
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2017
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IF 5.951
Wentao Gan,Shaoliang Xiao,Likun Gao,Runan Gao,Jian Li,Xianxu Zhan
Natural wood is functionalized using the index matching poly(methyl methacrylate) (PMMA) and luminescent γ-Fe2O3@YVO4:Eu3+ nanoparticles to form a novel type of luminescent and transparent wood composite. First, the delignified wood template was obtained from natural wood through a lignin removal process, which can be used as a support for transparent polymer and phosphor nanoparticles. Then, the functionalization occurs in the lumen of wood, which benefits from PMMA that fills the cell lumen and enhances cellulose nanofiber interaction, leading to wood composites with excellent thermal properties, dimensional stability, and mechanical properties. More importantly, this wood composite displays a high optical transmittance in a broad wavelength range between 350 and 800 nm, magnetic responsiveness, and brightly colored photoluminescence under UV excitation at 254 nm. The unique properties and green nature of the luminescent wood composite have great potential in applications including green LED lighting equipment, luminescent magnetic switches, and anti-counterfeiting facilities.
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ELECTROCHIMICA ACTA
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2016
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IF 4.803
Yurong Ren,Jiawei Wang,Xiaobing Huang,Jianning Ding
The electrochemical performance of a material varies with its structural phase transition. It is found that the rhombohedral Fe 2 O 3 can transform to the cubic Fe 3 O 4 via a calcination treatment in a nitrogen atmosphere, and lithium-ion storage performances of Fe 3 O 4 get an obvious improvement due to its structural advantages. On the basis of data calculated by X-ray diffraction, the larger unit cell volume as well as the higher void fraction of cubic Fe 3 O 4 provides lithium-ions with more transport channels for Li ions diffusion and storage without serious volume change, and thus the cubic Fe 3 O 4 delivers an excellent reversible capacity of 921.1 mAh g −1 after 15 cycles at the current density of 50 mA g −1 , which is much higher than 328.3 mAh g −1 for the rhombohedral Fe 2 O 3 . To further enhance the structural stability of electrodes, reduced graphene oxide is introduced. The Fe 3 O 4 /reduced graphene oxide show an excellent specific capacity of 825.3 mAh g −1 after 40 cycles and impressive rate performance of 600 mAh g −1 at the current density of 400 mA g −1 , which are much higher than that of Fe 3 O 4 (417 and 300 mAh g −1 ), Fe 2 O 3 (137.4 and 95 mAh g −1 ) and Fe 2 O 3 /reduced graphene oxide (390.1 and 480 mAh g −1 ). These results demonstrate that the structural phase transition and reduced graphene oxide of Fe 3 O 4 /reduced graphene oxide composites offer unique characteristics suitable for high-performance energy storage application.
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ACS Applied Materials & Interfaces
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2016
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IF 7.145
Long Liu,Xianfeng Yang,Chunxiao Lv,Aimei Zhu,Xiaoyi Zhu,Shaojun Guo,Chengmeng Chen,Dongjiang Yang
We developed a nanoscale Kirkendall effect assisted method for simple and scalable synthesis of three-dimensional (3D) Fe2O3 hollow nanoparticles (NPs)/graphene aerogel through the use of waste seaweed biomass as new precursors. The Fe2O3 hollow nanoparticles with an average shell thickness of ∼6 nm are distributed on 3D graphene aerogel, and also act as spacers to make the separation of the neighboring graphene nanosheets. The graphene–Fe2O3 aerogels exhibit high rate capability (550 mA h g–1 at 5 A g –1) and excellent cyclic stability (729 mA h g–1 at 0.1 A g–1 for 300 cycles), outperforming all of the reported Fe2O3/graphene hybrid electrodes, due to the hollow structure of the active Fe2O3 NPs and the unique structure of the 3D graphene aerogel framework. The present work represents an important step toward high-level control of high-performance 3D graphene–Fe-based NPs aerogels for maximizing lithium storage with new horizons for important fundamental and technological applications.
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PubMed
高影响因子
Energies
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2017
·Vol. 10
·期 9
·1296
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IF 2.262
Yizhi Yan,Haolin Tang,Fan Wu,Rui Wang,Mu Pan
A cocoon-like α-Fe2O3nanocomposite with a novel carbon-coated structure was synthesized via a simple one-step hydrothermal self-assembly method and employed as supercapacitor electrode material. It was observed from electrochemical measurements that the obtained α-Fe2O3@C electrode showed a good specific capacitance (406.9 Fg−1at 0.5 Ag−1) and excellent cycling stability, with 90.7% specific capacitance retained after 2000 cycles at high current density of 10 Ag−1. These impressive results, presented here, demonstrated that α-Fe2O3@C could be a promising alternative material for application in high energy density storage.Keywords:one-step;self-assembly;α-Fe2O3;carbon coating;supercapacitors
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CATALYSIS COMMUNICATIONS
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2017
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IF 3.33
Junyi Liu,Hua Huang,Xianxiang Liu,Jiafu Xiao,Sheng Zhong,Xichun She,Zaihui Fu,Steven Robert Kirk,Dulin Yin
A series of Fe 2 O 3 doped SBA-15 materials were prepared via an equivalent-volume impregnation method. The resultant Fe 2 O 3 -containing SBA-15 materials showed good performance in phenol methylation . Under the same conditions, the mesoporous catalyst with 5 wt.% Fe 2 O 3 showed the superior catalytic activity to that of pristine α -Fe 2 O 3 even at lower reaction temperature (320 °C vs. 350 °C). The elevated catalytic activity observed for the mesoporous catalyst could be due to high level dispersion of Fe 2 O 3 species in the mesoporous framework. Furthermore, the mesoporous catalyst possessed long lifetimes, which could be used continuously for 2000 h without significant loss of activity.
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GREEN CHEMISTRY
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2016
·Vol. 18
·期 21
·5900-5914
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IF 8.506
Shuangtao Yin,Jin Li,Hui Zhang
A series of honeycomb-like hierarchical hollow nanostructured magnetic catalysts, γ-Fe2O3@M3Al-LDH@Au25-x (x represents determined mass of gold in wt%), have been successfully fabricated by modified electrostatic adsorption of water-soluble captopril-capped Au25 nanoclusters (Au25Capt18) on pre-prepared magnetic supports, Fe3O4@M3Al-LDH (M = Ni, Mg, or Cu/Mg (0.5/2.5), LDH: layered double hydroxide) followed by proper calcination. The characterization results show that the low Au-loading samples, γ-Fe2O3@Ni3Al-LDH@Au25-x (x = 0.053, 0.11), show nearly atomically precise Au25 nanoclusters (Au25NCs) (∼1.4 ± 0.3–1.9 ± 0.6 nm) dispersed on the surface of the Ni3Al-LDH shell, while the catalysts, γ-Fe2O3@M3Al-LDH@Au25-x (x ∼ 0.2), display slightly aggregated Au25NCs on the LDH shell with sizes of ∼3.0 ± 1.3, 3.3 ± 1.2, and 4.2 ± 1.5 nm for Ni-, Mg-, and CuMg-based catalysts, respectively, related to varied synergy between Au25NCs and magnetic LDH supports at slightly higher Au loadings. All the γ-Fe2O3@M3Al-LDH@Au25-x catalysts exhibit much higher catalytic activity for the oxidation of 1-phenylethanol under atmospheric O2, without basic additives, in toluene than Fe3O4@Mg3Al-LDH@Au prepared by a traditional deposition–precipitation method. The catalyst, γ-Fe2O3@Ni3Al-LDH@Au25-x, presents even higher alcohol oxidation activity than γ-Fe2O3@Mg3Al-LDH@Au25-0.21 and γ-Fe2O3@Cu0.5Mg2.5Al-LDH@Au25-0.2 and, particularly, γ-Fe2O3@Ni3Al-LDH@Au25-0.053 exhibits the highest activity (TOF: 112 498 h−1) for the aerobic oxidation of 1-phenylethanol under solvent-free conditions and can be applied for a variety of alcohols, this being mainly attributed to its nearly atomically precise Au25NCs and remarkable Au25NCs–LDH–magnetic core three-phase synergistic interaction, along with its abundant Ni-OH sites. Moreover, γ-Fe2O3@Ni3Al-LDH@Au25-0.053 can be easily separated, by simply applying an external magnetic field, and reused for more than ten runs without significant loss of activity, giving the magnetic catalysts long-term stability. These observations make Fe3O4@LDH a universal green platform to support other noble or non-precious metal nanoparticles by using a metal nanocluster precursor method to construct desired metal-loaded ecofriendly catalysts that can be applied in a broad range of heterogeneous catalysis processes.
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高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Vasanthakumar Vasudevan,Baoyou Pei,Wentao Xiong,Jiao He,Shixuan Li,Dongha Huang,Xu Liao,Jinqing Lin
The Fenton degradation process has attracted significant attention as a promising method for treating organic dye-contaminated wastewater. However, its industrial application is limited by unsatisfactory catalytic performance. In this study, we synthesized a novel heterogeneous CuFe 2 O 4 /Fe 2 O 3 /C HCP Fenton catalyst by calcining a Fe/Cu-containing hyper-crosslinked polymer (HCP) and investigated its efficacy in degrading methylene blue (MB) dye pollutants. The degradation experiments using MB revealed that the optimized CuFe 2 O 4 /Fe 2 O 3 /C HCP -2/H 2 O 2 catalytic system achieved an impressive degradation efficiency of 97 % (k=0.2374 min −1 within 14 min, along with a total organic carbon conversion efficiency of 58.5 %. This degradation rate was approximately six times higher than that of Fe 2 O 3 /C HCP /H 2 O 2 (41 %; k=0.0365 min⁻¹) catalytic system, highlighting its superior degradation capabilities. Additionally, CuFe 2 O 4 /Fe 2 O 3 /C HCP -2 exhibited a wide operational pH range (pH 3–9) and maintained high cycling efficiency even after five successive recycles, indicating robust stability and reusability. The enhanced Fenton catalytic performance of CuFe 2 O 4 /Fe 2 O 3 /C HCP -2 can be attributed to the high specific surface area and porosity of the hyper-crosslinked polymer precursor, which ensures uniform dispersion of Fe/Cu elements, significantly improving catalytic efficiency and stability. This study provides a feasible strategy to enhance Fenton degradation activity, aiding in the removal of organic dye pollutants from aqueous environments and purification systems.
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JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Zhen Zhang,Fengqi Zhao,Ming Zhang,Yifan Jiang,Zhao Qin,Wengang Qu,Chao Chen,Jiankan Zhang
The carbon dots (CDs) were obtained by oxidation etching of coal pitch powder with peroxic acid. The CDs/Fe 2 O 3 composites were in-situ prepared by hydrothermal method. The composition, morphology and structure of CDs and CDs/Fe 2 O 3 were analyzed by TEM/HRTEM, XRD, EDS and XPS. The effects of CDs, Fe 2 O 3 and CDs/Fe 2 O 3 on the thermal decomposition of TKX-50 were studied by DSC-MS-FTIR and in-situ-solid FTIR. The three materials decreased the peak temperature of TKX-50 by 12.1, 33.9 and 39.0℃ (under the warming rate of 10℃·min −1 ). The CDs/Fe 2 O 3 showed best catalytic performance. The carboxyl group contained on the surface of CDs adsorbed NH 3 , inhibiting the formation of by-decomposition products ABTOX. Besides assimilating NH 3 and restraining the agglomeration of Fe 2 O 3 , the CDs/Fe 2 O 3 provided more active sites for decomposition which reduce the decomposition and activation energy of TKX-50 and promoted the reaction. Furthermore, CDs/Fe 2 O 3 reduced the ignition delay time of TKX-50 and significantly increased the flame propagation speed and flame area. Therefore, CDs and its compound CDs/Fe 2 O 3 have excellent application prospects in solid propellant combustion catalysts.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Li Chen,Jing Geng,Renhui Gao,Qianqian Xu,Zheng Guo
Metal oxide-based gas sensors encounter challenges in effectively detecting hazardous benzenes due to their stability and structural similarities. Here we report an innovative in situ growth method for synthesizing Fe 2 O 3 /Si-FeWO 4 heterostructure nanotubes (NTs) using highly negatively charged multivacant lacunary TBA 4 H 6 [SiW 9 O 34 ]·2H 2 O ( α -SiW 9 ) and Fe 3+ as precursors. A two-step process involving electrospinning followed by a thermal oxidation method was employed to synthesize a series of the uniform Si-FeWO 4 decorated Fe 2 O 3 heterostructure NTs. Considering the rich Fe 2 O 3 /Si-FeWO 4 active interfaces, rapid electron transfer, and high specific surface area, the optimal Fe 2 O 3 /Si-FeWO 4 based sensors demonstrate significantly higher sensitivity (S = 27.5) towards 50 ppm m-xylene in comparison to pristine Fe 2 O 3 (S = 1.8). Furthermore, the Fe 2 O 3 /Si-FeWO 4 exhibits excellent stability, humidity resistance, and high selectivity for m-xylene. This work offers an efficient, cost-effective strategy to synthesize Fe 2 O 3 /Si-FeWO 4 heterostructure NTs, with prospects for synthesizing other advanced sensing heterostructure nanomaterials with lacunary polyoxometalates as precursors.
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MATERIALS CHEMISTRY AND PHYSICS
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2018
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IF 2.21
Xinhong Qi,Zhijun Yan,Yang Liu,Xiangcun Li,Gaohong He,Sridhar Komarneni
Ni and Co doped Fe 2 O 3 hollow microspheres of yolk-shell type were designed and synthesized by using resin (RF-COOH) microspheres as hard template and subsequent calcination . Specific morphologies (walnut-like, jingle-bell-like and ball-like) and compositions of Fe 2 O 3 with different amounts of Ni and Co doping were obtained by tuning metal precursor concentration to optimize their performance in lithium-ion battery application. When Ni and Co doped Fe 2 O 3 hollow microspheres were used as anode materials for lithium-ion batteries, jingle-bell-like and ball-like morphologies showed better electrochemical performance with specific capacities of 415.7 and 414.1 mA h/g, respectively up to 200 cycles due to their stable construction with hollow cavity, porous shell and Ni and Co dopants . However, the specific capacity of Ni and Co doped Fe 2 O 3 @TiO 2 hollow microspheres increased to 562 mA h/g. This work showed a new avenue for designing and fabricating yolk-shell hollow structures with specific morphologies and compositions in order to optimize their specific capacity for use in lithium-ion batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Na Dai,Yingjie Zhang,Zhiwei Peng,Jikai Liu
An efficient CQDs/TiO 2 /Sn-Fe 2 O 3-x heterojunction photoanode was designed and fabricated to enhance the photoelectrochemical (PEC) performance of hematite for water oxidation. The key innovation of this work lies in the construction of an oxygen-vacancy-rich TiO 2 /Sn-Fe 2 O 3-x heterojunction photoanode by using Ti 3 C 2 MXene as the precursor of TiO 2 through a one-pot calcination process. The two main advantages of the present synthetic strategy are introducing abundant oxygen vacancies into the photoanode and preserving the nanostructure of the photoanode at high temperatures. During the synthesis, Ti 3 C 2 MXene was oxidized to form TiO 2 , while Sn-FeOOH was simultaneously converted into Sn-Fe 2 O 3-x nanorods. The high reducibility of Ti 3 C 2 MXene and the doping of Sn 4 + played a critical role in introducing abundant oxygen vacancies into Sn-Fe 2 O 3-x . The concurrent formation of TiO 2 and Sn-Fe 2 O 3-x effectively prevented the aggregation of α-Fe 2 O 3 nanorods at the high calcination temperature of 800°C and promoted close contact between the TiO 2 and Sn-Fe 2 O 3-x , reducing the interfacial transfer resistance. Lastly, the incorporation of CQDs further increased the light absorption ability and PEC performance of the heterojunction photoanode. The CQDs/TiO 2 /Sn-Fe 2 O 3-x photoanode achieved a photocurrent density of 1.47 mA/cm² at 1.23 V vs. RHE, which was 3.34 times higher than the α-Fe 2 O 3 . The enhanced PEC performance can be attributed to the introduction of abundant oxygen vacancies and the maintenance of its nanostructure at high temperatures, which can improve the donor density, charge transfer efficiency and light harvesting ability of the resultant photoanode.
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