Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Wang Zhifeng,Zhang Xiaomin,Zhao Yan,Li Meixian,Tan Taizhe,Tan Minghui,Zhao Zeren,Ke Chengzhi,Qin Chunling,Chen Zhihong,Wang Yichao
Due to the severe volume expansion and poor cycle stability, transition metal oxide anode is still not meeting the commercial utilization. We herein demonstrate the synthetic method of core-shell pomegranate-shaped Fe 2 O 3 /C nano-composite via one-step hydrothermal process for the first time. The electrochemical performances were measured as anode material for Li-ion batteries. It exhibits excellent cycling performance, which sustains 705 mAh g −1 reversible capacities after 100 cycles at 100 mA g −1 . The anodes also showed good rate stability with discharge capacities of 480 mAh g −1 when cycling at a rate of 2000 mA g −1 . The excellent Li storage properties can be attributed to the unique core-shell pomegranate structure, which can not only ensure good electrical conductivity for active Fe 2 O 3 , but also accommodate huge volume change during cycles as well as facilitate the fast diffusion of Li ion.
研究领域:
材料科学
·
电化学
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Jide Zhang,Jinxia Feng,Yaling Tian,Yiyong Wu,Xia Liu,Quanguo He
An electromical sensor based on α-Fe 2 O 3 @Co 3 O 4 -NRGO composited glass carbon electrode (GCE) was constructed and used for ultrasensitive tyrosine detection. A series of characterization techniques including scanning electron microscopy, X-ray diffraction and electrochemical impedance spectroscopy technique and cyclic voltammetry were employed to investigate the modified electrode. Compared with the bare GCE, the α-Fe 2 O 3 @Co 3 O 4 -NRGO/GCE exhibited a strong current response to tyrosine because of the synergistic effect of ternary composite. Under optimized conditions, the peak currents that responded to tyrosine concentration had a linear relationship from the scope of 0.01 to 10 µM (R 2 = 0.9977) by second derivative linear sweep voltammetry (SDLSV) and 8 nM (S/N = 3) is the detection limit. The sensor showed higher sensitivity, better repeatability, reproducibility and greater sensing stability related advantages over those in previous tyrosine detections. Furthermore, the sensor was successfully applied to trace tyrosine determination in practical samples such as milk and serum.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhen Xiang,Baiwen Deng,Chuang Huang,Zhicheng Liu,Yiming Song,Wei Lu
High-performance electromagnetic wave (EMW) absorbing materials have been widely used in the wireless communication and electronic devices due to their important potentials in electromagnetic attenuation. However, it is difficult to develop carbon-based absorbers with thin thickness, lightweight, and low filler loading. In this work, rationally designed hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites were successfully realized for ultrathin, lightweight, and high-efficiency EMW absorbers. It showed that the composition, microstructure, and morphology of composites were tailored, which gave rise to the tunable magnetic behavior, porosity, and electromagnetic parameters. The rational design of composition and novel structure contributed to the optimization of the impedance match. The EMW attenuation was enhanced by the synergistic effects of the dielectric loss originated from the interfacial and dipole polarization, conductive loss stemmed from the 3D conductive network, and the magnetic loss derived from the eddy-current loss and ferromagnetic resonance. Accordingly, the hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites with a low filling ratio of 20 wt% achieved an ultrathin matching thickness of 1.4 mm and a strong reflection loss of −63.6 dB. The substantially enhanced EMW absorbing performances were owing to the optimized impedance matching and enhanced attenuation capability. Therefore, this work can provide a paradigm for the design and synthesis of hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites with an enhanced EMW absorption.
研究领域:
材料科学
·
电磁学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 38
·11984-11990
·
IF 6.641
Jing Yang,Jiaqiang Liu,Yan Xu,Xianliang Li,Junbiao Wu,Yide Han,Zhuopeng Wang,Xia Zhang
Template-controlled syntheses via metal–organic frameworks (MOFs) have emerged as a general strategy to fabricate metal oxides with tailored porous structures. Here, novel hierarchical SnO2/α-Fe2O3 hollow microcubes have been obtained by post-loading of Sn2+ ions on the surface of Fe4(Fe(CN)6)3 microcubes and a subsequent thermolysis route. The as-formed hierarchical SnO2/α-Fe2O3 composites exhibit remarkable selective acetone-sensing properties, in which the optimum composition of SnO2/α-Fe2O3 with Sn : Fe = 1.5 exhibits the best response towards 200 ppm acetone gas under the operating temperature of 270 °C (with gas response Ra/Rg = 9.3), with a fast response/recovery speed (6 s/7 s), as well as excellent reproducibility for at least 15 days without a significant change in response. The applied strategy provides a general and controllable method to access other hierarchically structured multi-metal oxide architectures with intriguing morphologies and adjustable sensing properties.
研究领域:
材料科学
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化学传感器
·
纳米技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Rubin Zeng,Zhongjie Shen,Haigang Zhang,Yuxiang Cheng,Qinfeng Liang,Haifeng Liu
High-temperature sintering and solid-state reaction within the intricate Fe 2 O 3 /CaO system are pivotal factors influencing material characteristics. The current work focused on the sintering and reaction behavior of Fe 2 O 3 /CaO particles at high temperatures with a multiscale study of in-situ high-temperature stage microscopy (HTSM) and molecular dynamics (MD). The laws governing atomic migration and the evolution of crystal structure during the sintering process were simulated at the nanoscale. The results elucidated that a heightened heating rate fosters particle shrinkage and concomitant reduction in surface area. The sintering activation energy ( E sin ) exhibited an increment proportional to the linear shrinkage of the particles. Furthermore, an augmented potential barrier in advanced stages impeded subsequent sintering behavior. Augmented temperature promoted the particle shrinkage and sintering neck formation, culminating in pore closure and a diminution in the free surface. However, this promotional effect attenuated with escalating temperatures. Particle shrinkage and sintering neck formation are contingent upon atomic migration and diffusion, with the growth of sintering necks primarily reliant on atom diffusion along the surface of the sintering necks. The atomic diffusion activation energy was determined to be 49.5 kJ/mol within the temperature range of 1073–1473 K. Within the Fe 2 O 3 /CaO system, the preferential generation of Ca 2 Fe 2 O 5 (C2F) over CaFe 2 O 4 (CF) was found, leading to a decrease in the atomic diffusion barrier and an enhancement of the diffusivity, with the latter dominating in later stages. The highest mobility of O 2– , Fe 3+ , and Ca 2+ was discerned in CF, and the sintering shrinkage of the particles predominantly hinges on the generation of CF.
研究领域:
材料科学
·
计算化学
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Li Li,Kunchan Wang,Ting Lei
Exploring high-performance and cost-effective nonprecious metal-based electrocatalysts for overall water splitting is the key to sustainable renewable energy. Herein, petal-like NiFe 2 O 4 /Fe 2 O 3 heterostructure nanoarrays were constructed on iron foam (IF) surface by spontaneous galvanic displacement reaction and subsequent thermal oxidation. This in-situ grown integrated architecture is binder-free and useful for exposing accessible active sites, improving mass transfer and heightening the release of gases produced during water electrolysis. More importantly, the synergistic effect between NiFe 2 O 4 and Fe 2 O 3 effectively modulates the electronic structure of catalytic active sites, thereby promoting electrochemical kinetics. Accordingly, the optimal Ni-FeOx/IF 3 electrocatalyst exhibits remarkably enhanced catalytic activity in alkaline solution with only 230 and 82 mV to reach 10 mA cm −2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. The electrolyzer composed of Ni-FeOx/IF 3 as both the anode and cathode attain a current density of 10 mA cm −2 at a cell voltage of only 1.58 V for overall water splitting, with robust durability for 168 h in continuous water electrolysis, outperforming most reported NiFe-based catalysts. This work demonstrates a feasible and simple method to synthesize integrated electrodes with outstanding stability and high-performance for overall water splitting and provides an inspiration for future design of efficient bifunctional electrocatalysts.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Mo Qiu,Ruoqing Wang,Xinhua Qi
This paper reports a method of controllable synthesis of hollow polyhedral α-Fe 2 O 3 using H 3 btc and HF as additives. Three products with different morphologies were obtained by only adjusting the ratio of H 3 btc: HF. The as-prepared products were characterized using XRD, TG-DSC, FT-IR, Zeta potential analysis, UV, SEM and TEM. The characterization results reveal that H 3 btc is the key factor in preparing a hollow structure, and HF is vital to form a polyhedral morphology. On the basis of the time-dependent experiments, a probable growth mechanism of α-Fe 2 O 3 was proposed. Finally, the resulting hollow polyhedral α-Fe 2 O 3 exhibit good photocatalytic degradative ability for rhodamine B (RhB) molecules in water under visible light irradiation.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Ruowen Liang,Zhiyu Liang,Feng Chen,Danhua Xie,Yanling Wu,Xuxu Wang,Guiyang Yan,Ling Wu
Magnetically recyclable porous sodium dodecyl sulfate (SDS)/Fe 2 O 3 hybrids, which combine the porous structure of Fe 2 O 3 and hydrophobicity of SDS, have been successfully synthesized for the first time. Porous Fe 2 O 3 has been first pyrolyzed from MIL-100(Fe) using a simple two-step calcination route. Then, the obtained porous Fe 2 O 3 nanoparticles have been self-assembled with SDS molecules and yielded hydrophobic SDS/Fe 2 O 3 hybrids. The porous SDS/Fe 2 O 3 hybrids have been demonstrated to be highly efficient for the denitrification of pyridine under visible light irradiation. The pyridine removal ratio has reached values as high as 100% after irradiation for 240 min. Combining the results of a series of experimental measurements, it was concluded that the superior photocatalytic performance of SDS/Fe 2 O 3 hybrids could be attributed to (i) the fast electron transport owing to the unique porous structure of Fe 2 O 3 , (ii) the superior visible light absorption of Fe 2 O 3 nanoparticles, and (iii) the “bridge molecule” role of SDS efficiently improving the separation and transfer across the interfacial domain of SDS/Fe 2 O 3 of photogenerated electron-hole pairs. More significantly, after the catalytic reaction , the SDS/Fe 2 O 3 hybrids could be easily recovered using magnets and reused during subsequent cycles, which indicated their stability and recyclability.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Boying Liu,Junyan Wei,Shengnan Zhang,Asam Shad,Xiaosheng Tang,Ahmed A. Allam,Zunyao Wang,Ruijuan Qu
In this study, the catalytic performance of α-Fe 2 O 3 nanoparticles (nα-Fe 2 O 3 ) in the low-dose ferrate (Fe(VI)) system was systematically studied through the degradation of pentachlorophenol (PCP). Based on the established quadratic functions between nα-Fe 2 O 3 amount and observed pseudo first-order rate constant ( k obs ), two linear correlation equations were offered to predict the optimum catalyst dosage and the maximum k obs at an applied Fe(VI) amount. Moreover, characterization and cycling experiments showed that nα-Fe 2 O 3 has good stability and recyclability . According to the results of reactive species identification and quenching experiment and galvanic oxidation process , the catalytic mechanism was proposed that Fe(III) on the surface of nα-Fe 2 O 3 may react with Fe(VI) to enhance the generation of highly reactive Fe(IV)/Fe(V) species, which rapidly extracted a single electron from PCP molecule for its further reaction. Besides, two possible PCP degradation pathways, i.e., single oxygen transfer mediated hydroxylation and single electron transfer initiated polymerization were proposed. The formation of coupling products that are prone to precipition and separation was largely improved. This study proved that nα-Fe 2 O 3 can effectively catalyze PCP removal at low-dose Fe(VI), which provides some support for the application of Fe(VI) oxidation technology in water treatment in the context of low-carbon emissions.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Wang Xianhui,Pei Chunlei,Zhao Zhi-Jian,Chen Sai,Li Xinyu,Sun Jiachen,Song Hongbo,Sun Guodong,Wang Wei,Chang Xin,Zhang Xianhua,Gong Jinlong
Redox catalysts play a vital role in chemical looping oxidative dehydrogenation processes, which have recently been considered to be a promising prospect for propylene production. This work describes the coupling of surface acid catalysis and selective oxidation from lattice oxygen over MoO 3 -Fe 2 O 3 redox catalysts for promoted propylene production. Atomically dispersed Mo species over γ-Fe 2 O 3 introduce effective acid sites for the promotion of propane conversion. In addition, Mo could also regulate the lattice oxygen activity, which makes the oxygen species from the reduction of γ-Fe 2 O 3 to Fe 3 O 4 contribute to selectively oxidative dehydrogenation instead of over-oxidation in pristine γ-Fe 2 O 3 . The enhanced surface acidity, coupled with proper lattice oxygen activity, leads to a higher surface reaction rate and moderate oxygen diffusion rate. Consequently, this coupling strategy achieves a robust performance with 49% of propane conversion and 90% of propylene selectivity for at least 300 redox cycles and ultimately demonstrates a potential design strategy for more advanced redox catalysts.
研究领域:
化学工程
·
催化科学
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DOI
PubMed
高影响因子
Russian Journal of Physical Chemistry A
·
2020
·Vol. 94
·期 5
·1067-1072
·
IF 0.719
Liang An,Meng Yuan,Wang Tao,Xiong Chao,Yan Zhaoxiong,Xu Zhihua
Abstract A new magnetic Ag 3 PO 4 –TiO 2 –Fe 2 O 3 photocatalyst (Ag–Ti–Fe) has been synthesized by a solid-state blending method. The sample was analyzed by XRD, FT-IR, and VSM, and its photocatalytic performance in treatment of simulated dye-contaminated wastewater was evaluated in photocatalytic tests. SEM and FT-IR results confirmed that Ag–Ti–Fe catalyst was composed of Ag 3 PO 4 , anatase and maghemite. Results of photocatalytic tests revealed that Ag–Ti–Fe exhibited the highest photocatalytic activity on water treatment compared with contrastive samples whether the light source was UV or visible light, and the ultimate degradation efficiency of orange II reached 86.71 and 78.13%, respectively. Ag–Ti–Fe could decompose chemically stable groups, rather than simply destroy chromogenic azo double bonds, and it could further effectively remove methyl orange, rhodamine B, methylene blue from water, respectively. VSM results showed that the saturation magnetization of Ag–Ti–Fe was 4.80 emu/g, and it could be separated simply and quickly with the magnetic field.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
FUEL
·
2019
·
IF 5.128
Feifei Li,Xiaodong Wang,Hui Pan,Qiuye Li,Jianjun Yang
In this paper, disk-like α -Fe 2 O 3 nanoparticles were synthesized by one-step via an n-octyl alcohol-mediated self-assembly process and were subsequently used as the catalyst for the updating of heavy crude oil. The characterization results show that the diameter of the as-prepared α -Fe 2 O 3 disks is in the range of 150–200 nm and the nanoparticles have a hematite structure with [1 1 0] preferred orientation. The catalyst strongly acts on the asphaltene and causes its lower S content and N content, lower aromaticity and aromatic condensation, and higher branchiness index. Adding tetralin causes the increment of aromatics content, the decrease of resin, and more molecules containing aromatic moieties bearing 2 and 3 rings. The viscosity of the Shengli extra heavy oil reduced substantially from 161180 mPa∙s to 45882 mPa∙s (50 °C) through the combination of the α -Fe 2 O 3 nanoparticles and tetralin (a hydrogen donor).
研究领域:
材料科学
·
催化化学
·
石油工程
✓ 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）