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
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产品关联
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Lei Su,Yingnan Hua,Fan Yang,Zhi Chen,Zhichun Yang,Xinmiao Liang,Cheng Zhang,Gang Liu,Bing Chen
Iron oxide (Fe2O3) is emerging as a potential anode alternative for lithium-ion batteries (LIBs) due to the merits of high specific capacity, environmental friendliness, and cost-effectiveness. However, trapped by unsatisfactory cycling stability and rate capability, further modification is needed for Fe2O3 to achieve practical requirements. In this study, a Fe2O3-based composite anode (namely Fe2O3@HA-Fe-BPDC) with interlocked structure was designed and synthesized for pursuing enhanced electrochemical properties. Benefiting from the porous structure, abundant active sites, and good tolerance to volume expansion, the as-prepared electrode exhibits significantly boosted rate capability, excellent specific capacity, and satisfactory reversibility. Typically, the Fe2O3@HA-Fe-BPDC anode provided an excellent specific capacity of 708 mAh g–1 at 0.1 A g–1 and remained at a high level of 332 mAh g–1 at 1 A g–1, delivering significantly improved rate performance than Fe2O3. Additionally, outstanding capacity retention (95.4%) was achieved at 1 A g–1 after 600 charge/discharge cycles. The strategy based on the facile coprecipitation for fabricating Fe2O3 and MOF composite electrodes provides a feasible technique to develop a high-performance anode for LIBs.
研究领域:
材料科学
·
能源存储与转换
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Wenyan Yin,Khaled Tawfik Alali,Milin Zhang,Jingyuan Liu,Dalei Song,Qi Liu,Jing Yu,Rongrong Chen,Hongsen Zhang,Jun Wang
Ionic liquids are widely employed as electrolytes for electrochemical oxygen sensing due to their excellent physical and chemical properties. Recently, combining inorganic electrochemically active materials with ionic liquids are becomes intensively interesting to improve oxygen sensor performance. In this paper, two imidazolyl-based ionic liquids 1-ethyl-2,3-dimethylimidazole bis((trifluoromethyl)sulfonyl)imide [Emmim][TFSI] and 1-butyl-2,3-dimethylimidazole bis((trifluoromethyl)sulfonyl)imide [Bmmim][TFSI] with three saturated alkyl substituents on the aromatic ring were prepared by a traditional two-step method. Under the electrochemical test, both ionic liquids exhibit a certain responsibility to different concentrations of oxygen. Subsequently, α-Fe 2 O 3 /rGO was prepared by hydrothermal method and then mixed with the ionic liquids to prepare a composite ionic liquid electrolyte for detecting a wide range of oxygen concentrations. The response performance of prepared composite electrolyte toward the oxygen is improved, which exhibits a sensitivity of 0.1041 μA/[%O 2 ] to gradually changed oxygen concentration and a linear correlation (R 2 ) of 0.9997 between oxygen reduction peak currents. Hence, the results show that the pure ionic liquid has a certain ability to detect oxygen, while adding α-Fe 2 O 3 /rGO compounds further improve responsibility, stability and sensitivity of composite electrolyte to oxygen.
研究领域:
材料科学
·
电化学
·
传感器技术
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DOI
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 5
·1-10
·
IF 5.7
Ni Yun,Chen Xiu,Ling Chen,Zhu Ziye,Yue Yao,Wang Jie,He Aolin,Liu Ruijiang
The CYP2C19*2 gene carriers and non-carriers are closely related to the dosage of clopidogrel. To correctly guide the use of clopidogrel and promote individualized therapy, an ultra-sensitive electrochemical biosensor was developed for the detection of CYP2C19*2 gene. The heterogeneous α-Fe 2 O 3 /Fe 3 O 4 nanosheets were prepared via the hydrothermal-calcination process, and the preparation parameters were optimized. The average diameter and thickness of the nanosheets were approximately 150 nm and 53 nm, respectively; and the saturation magnetization was 80.2 emu/g. The α-Fe 2 O 3 /Fe 3 O 4 @Au nanosheets were prepared by sodium borohydride reduction method, and self-assembled to the electrode surface with magnetic field. Ultra-sensitive detection of CYP2C19*2 gene was realized through the recognition ability of strong single base mismatching of peptide nucleic acid and signal amplification effect of magnetic α-Fe 2 O 3 /Fe 3 O 4 @Au nanosheets. Under optimal detection conditions, the current had a good linear correlation with the negative logarithm of CYP2C19*2 gene concentration in the range 1 pM—1 nM, and the detection limit was 0.64 pM (S/N = 3). Meanwhile, the electrochemical signals of target DNA and incomplete complementary DNA were detected. The constructed biosensor exhibited good selectivity, reproducibility, and stability, providing a promising strategy for the detection of other gene mutations by electrochemical biosensors. Graphical Abstract
研究领域:
生物医学工程
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分子诊断学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhenyuan Ji,Lizhi Chen,Hongquan Yu,Wenyao Dai,Guanxiang Tang,Huali Li,Guoxing Zhu,Aihua Yuan,Xiaoping Shen
The development of novel electrode materials with admirable electrochemical behaviors is a new opportunity to meet the current demand for the high energy density of supercapacitors. Herein, a facile molecular precursor route is used to synthesize dual functionalized Fe 2 O 3 two-dimensional nanosheets with phosphate and nitrogen-doped carbon dots (P-Fe 2 O 3 /NCDs) modifications. Taking full use of the excellent characteristics of each component, the optimized P-Fe 2 O 3 /NCDs anode material achieves superior electrochemical features with an outstanding specific capacitance of 453 F g −1 at 1 A g −1 . The cycling stability of P-Fe 2 O 3 /NCDs nanosheets is as high as 91.0 % after 10,000 cycles at 15 A g −1 . Subsequently, phosphate and NCDs modified Co 9 S 8 (P-Co 9 S 8 /NCDs) nanoflowers with convenient ion transport properties are fabricated, which possess a satisfied electrochemical capacity of 569 C g −1 at 1 A g −1 with desirable cycling stability at 15 A g −1 . Impressively, the designed P-Co 9 S 8 /NCDs//P-Fe 2 O 3 /NCDs hybrid supercapacitor can achieve an excellent energy density of 85.1 Wh kg −1 at 937.5 W kg −1 and can retain 93.9 % capacitance efficiency after 20,000 cycles at 10 A g −1 . The superior properties of the dual functionalized electrode materials provide a new choice for constructing advanced hybrid supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qiang Fu,Yue Meng,Yiyang Yao,Hui Shen,Bo Xie,Zheming Ni,Shengjie Xia
A synergistic strategy of Facet engineering and the construction of Z-scheme heterojunctions is expected to improve internal consumption and insufficient carriers in photocatalysis significantly. In this paper, Fe 2 O 3 nanoparticles were selectively grown on the (110) facet of BiVO 4 , and facet orientation-supported Z-scheme heterojunction of BiVO 4 (110)-Fe 2 O 3 was constructed for the photocatalytic degradation of tetracycline . The effects of catalyst dosage, pH, temperature, and other conditions on the degradation performance were systematically investigated and found to have excellent catalytic activity , structural stability, and reusability. The removal of TC (15 mg·L −1 ) under 60 min visible light irradiation were 57.7%, 81.7%, and 91.5% for single-phase catalyst, non-directionally loaded BiVO 4 -Fe 2 O 3 and directionally loaded BiVO 4 (110)-Fe 2 O 3 Z-scheme heterojunction (0.3 g·L −1 ), respectively. Combining photoelectric testing and DFT calculation, it was confirmed that the presence of the built-in electric field from BiVO 4 (110) pointing to Fe 2 O 3 (110) in BiVO 4 (110)-Fe 2 O 3 Z-scheme heterojunction facilitates the separation and transfer of photogenerated carriers and significantly improves the photodegradation performance of the material. In addition, the intermediates and degradation pathways were investigated in detail.
研究领域:
材料科学
·
环境科学
·
化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Songbo Wang,Yidan Wang,Jia Li,Shuang Guo,Chengzhen Meng,Lun Pan,Ji-Jun Zou,Yawei Shi,Lei Zhang,Zhen Yin,Na Tang
In order to address the current energy and environmental challenges, photoelectrochemical (PEC) water splitting has been widely studied, and the key point about the efficient PEC process is how to develop highly active photoanode catalysts. In this article, we report a two-step hydrothermal and electrodeposition approach to prepare a cobalt (oxy)hydroxide (CoOOH)-modified Ti-Fe2O3-In2O3 electrode by synergy of electron modulation and a heterojunction structure for promoting PEC water splitting. Under a bias of 1.23 V vs RHE, the optimized Ti-Fe2O3-In2O3/CoOOH photoanode demonstrated remarkable photocurrent density and hydrogen evolution rate as high as 1.33 mA cm–2 and 22.8 μmol cm–2 h–1, which was 5.11-fold and 5.14-fold that of bare α-Fe2O3, respectively. Characterization results indicate that Ti-doping will alter the electronic structure and improve the charge carrier density, whereas the construction of a heterojunction can realize the spatial separation of charge carriers. Meanwhile, the outer CoOOH ultrathin layer can provide a large amount of oxygen evolution reaction sites and promote the surface reaction. This work suggests that the PEC performance of Fe2O3-based photoanodes can be improved effectively by the synergy of electronic modulation and heterojunction construction.
研究领域:
能源与环境科学
·
材料科学
·
光化学
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产品关联
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-7
·
IF 5.578
Li Xiaodong,Wang Zhi,Zhang Zemin,Chen Lulu,Cheng Jianli,Ni Wei,Wang Bin,Xie Erqing
The photoelectrochemical (PEC) water splitting is hampered by strong bonds of H 2 O molecules and low ionic conductivity of pure water. The photocatalysts dispersed in pure water can serve as a water activation agent, which provides an alternative pathway to overcome such limitations. Here we report that the light illuminated α−Fe 2 O 3 /Pt nanoparticles may produce a reservoir of reactive intermediates including H 2 O 2 , ·OH, OH − and H + capable of promoting the pure water reduction/oxidation half−reactions at cathode and highly photocatalytic−active TiO 2 /In 2 S 3 /AgInS 2 photoanode, respectively. Remarkable photocurrent enhancement has been obtained with α−Fe 2 O 3 /Pt as water activation agent. The use of α−Fe 2 O 3 /Pt to promote the reactivity of pure water represents a new paradigm for reproducible hydrogen fuel provision by PEC water splitting, allowing efficient splitting of pure water without adding of corrosive chemicals or sacrificial agent.
研究领域:
材料科学
·
能源科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 3
·890-897
·
IF 2.606
Tian Zhennan,Wu Taiqi,Hu Rong,Yu Junsheng,Cheng Jiang,Li Lu
In this study, a ZnO-Fe 2 O 3 thin film was designed as electron transport layer for organic solar cells (OSCs). The preparation strategy was based on the spin coating of aqueous sol–gel precursor. The result showed that composite ZnO-Fe 2 O 3 -based OSCs had higher power conversion efficiency than pure ZnO-based OSCs. To explain this result, morphology, optical and physical properties of ZnO-Fe 2 O 3 were investigated to analyze the relation between structure of interface layer and performance of OSCs. It was demonstrated that composite ZnO-Fe 2 O 3 layer had denser structure and lower surface roughness than pure ZnO layer. Thus, it showed a good contact with the active layer. Furthermore, 3.3% Fe 2 O 3 could reduce the W F and E g of ZnO, and greatly enhanced electron mobility from the acceptor (IT-4F) phase to the ZnO/ITO electrode. Meanwhile, ZnO-Fe 2 O 3 layer showed a low reflectivity that allowed more photons to entrance the active layer for utilization. Hence, the higher short-circuit current and power conversion efficiency were achieved in ZnO-Fe 2 O 3 -based OSCs.
Graphical abstract
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 23
·5604
·
IF 4.2
Zhiqiang Yu,Qingcheng Wang,Jinhao Jia,Wenbo Kang,Meilian Ou,Zhimou Xu
Among the transition metal oxides, hematite (α-Fe2O3) has been widely used in the preparation of memristors because of its excellent physical and chemical properties. In this paper, α-Fe2O3nanowire arrays with a preferred orientation along the [110] direction were prepared by a facile hydrothermal method and annealing treatment on the FTO substrate, and then α-Fe2O3nanowire array-based Au/α-Fe2O3/FTO memristors were obtained by plating the Au electrodes on the as-prepared α-Fe2O3nanowire arrays. The as-prepared α-Fe2O3nanowire array-based Au/α-Fe2O3/FTO memristors have demonstrated stable nonvolatile bipolar resistive switching behaviors with a high resistive switching ratio of about two orders of magnitude, good resistance retention (up to 103s), and ultralow set voltage (Vset= +2.63 V) and reset voltage (Vreset= −2 V). In addition, the space charge-limited conduction (SCLC) mechanism has been proposed to be in the high resistance state, and the formation and destruction of the conductive channels modulated by oxygen vacancies have been suggested to be responsible for the nonvolatile resistive switching behaviors of the Au/α-Fe2O3/FTO memristors. Our results show the potential of the Au/α-Fe2O3/FTO memristors in nonvolatile memory applications.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 32
·12745-12755
·
IF 4.177
Jun Liu,Wei Wu,Qingyong Tian,Zhigao Dai,Zhaohui Wu,Xiangheng Xiao,Changzhong Jiang
Coupling two different semiconductors to form composite photocatalysts is the most significant method for environmental remediation. In this regard, tube-like α-Fe2O3/Ag6Si2O7 heterostructures are synthesized via anchoring p-type Ag6Si2O7 nanoparticles (NPs) on the surface of n-type α-Fe2O3 short nanotubes (SNTs) by conventional wet-chemical routes. α-Fe2O3 SNTs are firstly fabricated by a hydrothermal method with the assistance of dihydrogen phosphate and sulphate. Then, Ag6Si2O7 NPs are anchored on α-Fe2O3 SNTs by an in situ deposition method, and the α-Fe2O3/Ag6Si2O7 p–n heterostructures are finally obtained. The morphologies, crystal structure, photocatalytic performance and photocurrent properties of as-synthesized α-Fe2O3/Ag6Si2O7 heterostructures are investigated. Six organic dyes are used for determining the high-efficiency Z-scheme photocatalytic activities of the as-obtained photocatalysts under ultraviolet and visible light (mercury lamp, 300 W). Compared with pure α-Fe2O3 SNTs, the photocurrent intensity of the α-Fe2O3/Ag6Si2O7 heterostructures is improved 62 times. The enhanced significant photocatalytic performance of α-Fe2O3/Ag6Si2O7 heterostructures could be attributed to charge transfer between Ag6Si2O7 NPs and the charge separation between Ag6Si2O7 NPs and α-Fe2O3 SNTs. These composite heterostructures are proposed to be an example for the preparation of other composite silicate photocatalysts for practical application in environmental remediation issues.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2018
·
IF 3.12
Zheng Chen,Yaxian Zhang,Qingliu Luo,Liuying Wang,Shurui Liu,Yajuan Peng,Haitao Wang,Liang Shen,Qingbiao Li,Yuanpeng Wang
Microbially mediated bioreduction of iron oxyhydroxide plays an important role in the biogeochemical cycle of iron. Geobacter sulfurreducens is a representative dissimilatory iron-reducing bacterium that assembles electrically conductive pili and cytochromes . The impact of supplementation with γ-Fe 2 O 3 nanoparticles (NPs) (0.2 and 0.6 g) on the G. sulfurreducens -mediated reduction of ferrihydrite was investigated. In the overall performance of microbial ferrihydrite reduction mediated by γ-Fe 2 O 3 NPs, stronger reduction was observed in the presence of direct contact with γ-Fe 2 O 3 NPs than with indirect contact. Compared to the production of Fe(II) derived from biotic modification with ferrihydrite alone, increases greater than 1.6- and 1.4-fold in the production of Fe(II) were detected in the biotic modifications in which direct contact with 0.2 g and 0.6 g γ-Fe 2 O 3 NPs, respectively, occurred. X-ray diffraction analysis indicated that magnetite was a unique representative iron mineral in ferrihydrite when active G. sulfurreducens cells were in direct contact with γ-Fe 2 O 3 NPs. Because of the sorption of biogenic Fe(II) onto γ-Fe 2 O 3 NPs instead of ferrihydrite, the addition of γ-Fe 2 O 3 NPs could also contribute to increased duration of ferrihydrite reduction by preventing ferrihydrite surface passivation. Additionally, electron microscopy analysis confirmed that the direct addition of γ-Fe 2 O 3 NPs stimulated the electrically conductive pili and cytochromes to stretch, facilitating long-range electron transfer between the cells and ferrihydrite. The obtained findings provide a more comprehensive understanding of the effects of iron oxide NPs on soil biogeochemistry .
研究领域:
微生物学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）