SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Yang Li,Huijie Zhao,Huitao Ban,Mujie Yang
Fe 2 O 3 nanosheets were in-situ deposited on the interdigitated gold electrodes by hydrothermal treatment of the electrospun nanofibers containing FeCl 3 and poly(vinyl butyral). As-prepared electrode was further dip-coated with water-dispersible polyaniline (PANI) to fabricate a resistance gas sensor based on Fe 2 O 3 /PANI nanocomposite. The structure and morphology of the nanocomposite were investigated by X-ray diffraction pattern, Fourier transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. It was found that the nanocomposite sensor exhibited much higher response magnitude towards low concentration of NH 3 (0.5–10.7 ppm) than the sensors based on either PANI or Fe 2 O 3 at room temperature (∼20 °C), indicating an obvious synergetic effect. The nanocomposite sensor was featured with ultra high response magnitude (relative resistance change of ∼3070% towards 10.7 ppm of NH 3 ) and excellent selectivity towards NH 3 . A sensing mechanism has been put forward, which takes into account of the conducting network comprising of bulk PANI and composites of PANI and Fe 2 O 3 nanosheets. It was proposed that the p/n heterojunction established between Fe 2 O 3 nanosheets and PANI coating played a major role in the highly desirable sensing performance of the composite.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zhuan Wang,Bo Yang,Xueying Zhao,Yushuai Chen,Dandi Wei,Lijuan Zhang,Xintai Su
Oxygen evolution reaction (OER) is the bottleneck of photocatalytic water splitting due to the slow four-electron transfer kinetics, and the construction of ultrathin materials is considered to be an effective means to solve the above problem. Herein, ultrathin γ-Fe 2 O 3 nanosheets (Fe 2 O 3 -NS) were prepared by a facile solution reduction-low temperature calcination method. The prepared photocatalyst has a leaf-like morphology with an average thickness of 2.0 nm and a large number of slit-like pores. Compared with γ-Fe 2 O 3 bulk, Fe 2 O 3 -NS exhibits excellent photocatalytic OER activity. The apparent quantum yield (AQE) and oxygen yield (measured at 420 nm) are 12.95% and 57.04%, respectively. The OER efficiency is superior to those reported iron oxide photocatalysts. This excellent performance may benefit from the ultrathin porous structure, appropriately narrow bandgap, and abundant oxygen vacancies . In addition, the photocatalyst shows good cycling stability, retaining 91.5% of the initial capacity in the fifth cycle test, which may be attributed to the magnetic cycling capability and good structural stability. This study confirms that Fe 2 O 3 -NS is a competitive candidate material for photocatalytic oxygen evolution and provides ideas for the design and construction of other defect-rich metal oxide nanosheets.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
Materials Today Chemistry
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2021
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IF 8.301
H. Zhang,J. Xu,S. Wang,Q. Liu,X. Kong
Iron-based nanostructured materials are desirable for various applications owing to their high magnetization. Herein, we presented a facile fabrication of free-standing γ-Fe 2 O 3 nanosheets by a molten salt method for microwave absorption. Furthermore, Al component was incorporated to serve as the template for hole production. The designed holey γ-Fe 2 O 3 nanosheets were effective to maximize the usage of nanomaterials, thereby providing larger surface area, richer defects, and more polarization centers. Both experimental measurements and electric field simulation showed an enhanced capability for microwave absorption using holey γ-Fe 2 O 3 when compared with its intact counterpart. Oxygen vacancy was generated during the hole evolution, which significantly improved the electrical conductivity and thus promoted the conductive loss mechanism. In addition, the holey configuration may extend the transmission path of microwave and confer it with multiple reflection and scattering within the absorbent matrix. Meantime, the polarization loss was strengthened owing to Al modulation associated with the induced defect sites. With the improvement in conductive loss, polarization, impedance matching, and attenuation constant, the as-synthesized holey γ-Fe 2 O 3 exhibited promising microwave absorbability, with a maximum reflection loss of 52.4 dB and an effective bandwidth of 5.12 GHz at a thickness of 2.2 mm, overperforming most pure Fe-based materials.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
RSC Advances
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2014
·Vol. 4
·期 18
·9314-9320
·
IF 3.708
Xiangui Ding,Liu Bao,Jiang Jiang,Hongwei Gu
A facile method of synthesizing γ-Fe2O3 ultrathin nanoplates has been developed. These nanoplates are single crystalline and superparamagnetic at room temperature, with a thickness of only 1.4 nm. FTIR analysis has shown that the coordination mode between Fe and carboxyl group is dominated by bidentate configuration in the as prepared iron oleate complex, which is the key for producing the nanoplate morphology. By changing the reaction temperatures, the lateral size and thickness of nanoplates can be varied.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
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IF 6.959
Qiuyan Hao,Liang Zhang,Yaohui Gao,Da Cao,Jianwei Zhao,Ying Li,Caichi Liu,Zhi Qiao,Wenjun He,Hui Liu
It is indispensable to explore earth-abundant and high-efficiency transition-metal-oxide electrocatalysts toward the hydrogen evolution reaction (HER). However, their catalytic performance is impeded by the poor conductivity. Herein we rationally design and manufacture sulfur-doped Fe2O3 nanosheet arrays grown on iron foam (S-Fe2O3/IF) with enhanced HER performance in alkaline media. The obtained catalyst exhibits a low overpotential of 134 mV to achieve a current density of 10 mA cm–2 with a small Tafel slope of 76 mV dec–1 and shows an excellent long-term durability with barely any degradation for 50 h. The density functional theory calculation and experimental results demonstrate that the sulfur anion could optimize adsorption free energies of hydrogen/water and improve the intrinsic activity of Fe2O3. This work not only develops a catalyst with highly efficient performance but also provides design guidance to rationally manufacture an earth-abundant-element electrocatalyst for large-scale water splitting to hydrogen.
研究领域:
材料科学
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电催化
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可再生能源
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2020
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IF 3.442
Deqiang Feng,Jie He,Lingcheng Zheng,Wenjun Jiang,Ce Zhang,Long Li,Jian Song,Wei Yao
Developing novel catalysts and catalysis processes are highly attractive in environmental protection and energy utilization. Photocatalysis-Fenton combinational process is an environmentally friendly technology and has broad application prospects. In this work, thin Fe@α-Fe 2 O 3 nanosheets with thickness of 2–5 nm were designed by oxidation of Fe metal nanostructure synthesized using a modified solution reaction method. The nanosheet structure with thin thickness has short diffusion distance for the photogenerated carriers and prolongs the carriers' life. Simultaneously, the presence of Fe can reduce the resistance of system and further promote the transport and transfer of photogenerated carriers from the bulk to the surface, causing less carrier recombination and better photocatalytic performance. What's more, the Fe@α-Fe 2 O 3 composite can induce the Fenton-like reaction to generate active • OH radicals, which significantly improve the degradation rate . The synergistic effect of photocatalysis and Fenton processes makes the system show an enhanced photodegradation performance: 96.5% of RhB is degraded after 60 min visible light irradiation , especially, 84.3% of RhB is degraded within the first 10 min, which are much higher than that of the pure α-Fe 2 O 3 sample. This work demonstrates that the conjunction of photocatalysis and Fenton processes based on the Fe@α-Fe 2 O 3 nanosheets provides a potential application for pollutants degradation.
研究领域:
环境化学
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材料科学
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催化化学
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纳米科技
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物理化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Weiguang Hu,Qinghua Xia,Lian Ying Zhang,Jianguo Lu,Qinggang He,Weiyong Yuan
Amorphous MOFs (a-MOFs) could be highly promising cocatalysts of 3-D α-Fe2O3 to greatly improve its photoelectrochemical oxygen evolution performance, but their effective synthesis and assembly on 3-D α-Fe2O3 presents formidable challenges. A conformal and ultrathin layer of amorphous Co–TDPAT (a-Co–TDPAT) MOF cocatalyst has been in situ self-assembled on an α-Fe2O3 nanosheet array (NSA) by employing 5,5′,5″-(1,3,5-triazine-2,4,6-triyl)tris(azanediyl)triisophthalic acid (H6TDPAT) as the organic ligand. The obtained α-Fe2O3 NSA@a-Co–TDPAT core–shell NSA exhibits a photocurrent density of 1.54 mA cm−2 (1.23 V), onset potential of ∼0.48 V, and photoconversion efficiency of 0.25%, 6.2 times higher, 290 mV lower, and 12.5 times higher, respectively, than those of the α-Fe2O3 NSA. The photocurrent density and the photoconversion efficiency are among the highest reported for photoanodes based on the FTO-supported α-Fe2O3 NSA without addition of noble metals, and the onset potential is the lowest among those of FTO-supported α-Fe2O3-based photoanodes reported. It is discovered that a-Co–TDPAT significantly enhances charge separation and accelerates charge transport and transfer for a fast oxygen evolution reaction, thus greatly boosting PEC oxygen evolution. This work not only provides a novel strategy to produce highly efficient, highly stable, low-cost, and earth-abundant core–shell water splitting photoanodes via in situ self-assembly of conformal, ultrathin a-MOFs on an α-Fe2O3 NSA, but sheds light on the mechanisms for controlled self-assembly of MOFs and PEC performance enhancement of α-Fe2O3-based photoelectrodes.
研究领域:
材料科学
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光催化
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能源转换
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Hao Li,Yuwei Zhao,Yuting Kui,Yiting Wang,Ruiying Zhang,Xiaosi Sang,Jingli Shen,Qiue Cao
Herein, a novel molecularly imprinted photoelectrochemical (MIP-PEC) sensor was fabricated through integrating the ultrathin nanosheets of Fe 2 O 3 (Fe 2 O 3 NSs) with molecular imprinting technology for the ultrasensitive detection of imidacloprid (IMD). Impressively, the two-dimensional Fe 2 O 3 NSs was synthesized on an indium‑tin oxide (ITO) substrate by electrodeposition. Benefiting from its narrow bandgap and large specific surface area, the photogenerated charge separation efficiency of Fe 2 O 3 NSs (∼ 600 μA) was remarkably enhanced compared to that of the commercial Fe 2 O 3 nanoparticles (∼150 μA), which significantly improved the sensitivity of the developed MIP-PEC sensor. Furthermore, the electropolymerization technique was used to form a molecularly imprinted polymer film of IMD on the surface of Fe 2 O 3 NSs/ITO, substantially increased the detection selectivity of the proposed sensor. As a result, the designed MIP-PEC sensor successfully achieved ultrasensitive and specific as well as reliable detection of IMD with a broad linear response (5 nM ∼ 120 μM), low detection limit (1.02 nM) and long storage time (the signal only decreased by 5.03 % after 4 weeks of storage). The recoveries and relative standard deviation (RSD) for the determination of IMD in fruits and environmental water samples by the obtained MIP-PEC were in the range of 92.0 % ∼ 108.0 % and 3.2 % ∼ 4.9 % respectively, validating its field-applicability. Obviously, this work established a novel paradigm for synergistic enhancement of the analysis performance of PEC through integration of the advanced photosensitive materials with molecular imprinting technology.
研究领域:
分析化学
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环境监测
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食品安全
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生物传感器
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材料科学
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农药残留检测
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分子识别
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Mengru Shi,Weijiang Tang,Sheng Guo,Fengxi Chen
Emerging antibiotic pollutants pose long-term risks to ecosystems and human health, necessitating the development of advanced elimination technologies. In this study, hierarchically porous α-Fe 2 O 3 nanosheets (α-Fe 2 O 3 -PNS) were prepared from an iron-polyvinylpyrrolidone (Fe-PVP) hybrid gel, where PVP served multiple functions, including iron immobilization, morphology template, pore formation, and crystallite growth regulation. As an efficient heterogeneous Fenton-like catalyst, α-Fe 2 O 3 -PNS achieved 93.6 % degradation of tetracycline (TC, 25 mg/L) within 2 h under mild conditions (25 °C, pH 5) using only 4 mM H 2 O 2 . The reaction followed pseudo-first-order kinetics with a high rate constant (0.0606 min −1 ) and an outstanding normalization factor (8.13). Key operational parameters (i.e., PVP dosage, catalyst loading, H 2 O 2 concentration, initial pH, coexisting anions and natural organic matter) were investigated. The material exhibited good reusability over five consecutive cycles and maintained robust performance in real water matrices. Its superior catalytic activity originated from exposed (113) crystal planes, abundant accessible iron sites, and rapid Fe 3+ /Fe 2+ redox cycling facilitated by the large surface area. Radical quenching tests and electron paramagnetic resonance spectroscopy confirmed that hydroxyl radicals, generated via surface Fe 2+ -mediated H 2 O 2 activation, are dominant reactive species, driving TC degradation through hydroxylation, oxidative cleavage, and ring-opening reactions. This study provides an energy- and resource-efficient solution for sustainable water remediation, operating effectively under ambient and circumneutral conditions with low H 2 O 2 consumption.
研究领域:
环境催化
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材料科学
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水处理技术
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纳米材料化学
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污染控制工程
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产品关联
DOI
PubMed
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2023
·Vol. 18
·期 7
·2300102
·
IF 2.8
Wenlong Chu,Ruifeng Xin,Luwei Zou,Xiulian Fan,Xilong Zhou,Cheng Li,Yu Zhou
2D nonlayered materials have attracted more and more attention due to their novel properties and special surface structures. However, due to isotropic chemical bonds within the crystal, the synthesis of ultrathin 2D nonlayered materials is an urgent challenge. Herein, α -Fe 2 O 3 2D nanosheets as thin as ≈8.2 nm on different substrates using self-designed ultralow concentration precursors combined with Gibbs free energy and Se catalysts design are successfully synthesized. The thickness-dependent growth mechanism is systematically studied, demonstrating the thermodynamic and kinetic controlling factors. The as-grown α -Fe 2 O 3 nanosheets are demonstrated with single-crystal structures without any other elements doping. The α -Fe 2 O 3 nanosheets photodetectors show the reasonable response performance with the positive photoconductive mechanism. This improved chemical vapor deposition method provides a promising idea for the synthesis of ultrathin 2D nonlayered materials.
研究领域:
材料科学
·
纳米科技
·
表面科学
·
凝聚态物理
·
光电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）