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.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Zengliang Ren,Li Lei,Linwei Zhu,Shuimiao Xia,Runhua Fan,Davoud Dastan,Hongzhi Cui,Zhicheng Shi
Polymer dielectrics have broad applications in advanced electronics and power systems. However, they suffer from low energy density and poor breakdown performance at high temperatures, limiting their applications in high-temperature environments. Herein, TiO 2 @Au@AlO x @Au nanofibers with double coulomb blockade nanolayers are obtained via a physical sputtering strategy to improve the high-temperature energy storage performance of polyetherimide composites. Experimental studies and finite elemenet phase-field simulations demonstrate that the double-layer coulomb blockade effect and micro-capacitor effect of Au nanoparticles synergistically enhance the breakdown strength and dielectric permittivity of polyetherimide composite at high temperatures. Notably, the composite exhibits ultra-high discharged energy densities of 11.33 and 9.70 J cm −3 at 150 and 200 °C, respectively, along with high charge–discharge efficiencies of 93.4% and 84%, which far exceed that of the polymer nanocomposites reported so far. Furthermore, the composite exhibits excellent charge–discharge cycling performance (>50000 cycles at 400 MV m −1 ) and high-power density (1.16 MW cm −3 ) at 200 °C, making it an ideal candidate for high-temperature capacitors. Hopefully, these nanofibers not only serve as excellent nanofillers for high-temperature energy storage dielectric composites but also holds tremendous potential and inspirational significance for other applications such as electronics, biomedical fields, optics, and catalysis.
研究领域:
材料科学
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电气工程
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纳米技术
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Applied Sciences-Basel
·
2021
·Vol. 11
·期 10
·4393
·
IF 2.679
Yongbo Wu,Linfeng Lan,Penghui He,Yilong Lin,Caihao Deng,Siting Chen,Junbiao Peng
Over the past decade, there have been many reports on solution-processed oxide thin-film transistors (TFTs) with high mobility (even >100 cm2V−1s−1). However, the capacitance uncertainty of the solution-processed oxide gate dielectrics leads to serious overestimation of the mobility. Here, solution-processed AlOxdielectrics are investigated systematically, and the effect of mobile ions on the frequency-dependent capacitance of the solution-processed AlOxdielectrics is also studied. It was found that the capacitance of the AlOxdepends on the frequency seriously when the annealing temperature is lower than 300 °C, and the water treatment causes more seriously frequency-dependent capacitance. The strong frequency-dependent capacitance of the AlOxannealed at 250 or 300 °C is attributed to relaxation polarization of the weakly bound ions in the incompletely decomposed AlOxfilms. The water treatment introduces a large number of protons (H+) that would migrate to the ITO/AlOxinterface under a certain electric field and form an electric double layer (EDL) that has ultrahigh capacitance at low frequency.Keywords:Aluminum oxide;dielectric;thin-film transistor;solution-processed;oxide semiconductor
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Yanan Wei,Rui Wang,Wenchao Xu,Fangfang Zhao,Dejian Yan,Xiaowen Zhang,Zhenpan Chen,Kuiyi You,He’an Luo
The catalytic amination of 1,6-hexanediol to hexamethyleneimine (HMI) introduces an innovative approach for the preparation of 1,6-hexanediamine, which is a critical monomer in the manufacture of nylon-66. This work presents a straightforward and efficient method for the catalytic amination of 1,6-hexanediol to HMI over hydrotalcite-derived Ni 2 Co 1 /AlO x catalyst. Under the optimal reaction conditions, the conversion of 1,6-hexanediol achieves 99.3% with 92.1% of selectivity to HMI. The results indicate that the alloy effects between Ni and Co significantly enhance the catalytic performance. The strategic incorporation of Co facilitates the reduction of NiO species and increases the concentration of metallic nickel (Ni 0 ). Moreover, DFT calculations further reveal that the Ni sites on the (111) crystal plane of the Ni 2 Co 1 alloy serve as the primary catalytic active sites. This work represents a promising green process for production of 1,6-hexanediamine from the reductive amination of 1,6-hexanediol via HMI employing non-noble metal Ni 2 Co 1 /AlO x alloy catalyst.
研究领域:
催化化学
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材料科学
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绿色化学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xiaomei Yu,Junwei Xu,Liang Guo,Jieqi Zhou,Rumeng Ouyang,Xiuzhong Fang,Jiating Shen,Xiang Wang
At present, there are still controversy viewpoints on the reactive oxygen sites in the OCM reaction on ABO3 perovskites. Some researchers believe that electron-deficient chemisorbed oxygen species (O2–, O22–, and O–) contribute to C2 product formation, and surface lattice oxygen (O2–) promotes the deep oxidation of methane, while others hold an opposite viewpoint. In addition, the influence of BOx polyhedra on the reactive sites and reaction performance has rarely been elucidated. Considering this, two types of LaAlO3 perovskites, comprising different contents of surface and bulk coordinatively unsaturated sites (AlO4 tetrahedra), were synthesized for the OCM reaction. Through a series of in situ and ex situ characterization techniques and combined with DFT calculations, a high oxygen vacancy concentration was revealed for the AlO4-rich LaAlO3 perovskite, leading to an abundance of reactive oxygen and promoting oxygen mobility. The study identified monatomic surface lattice oxygen O2– as the active sites for the deep oxidation of methane at low temperatures. The O22– species generated by oxygen vacancies promotes the formation of C2 products at high temperatures.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yaru Xu,Zhaoyang Xu,Zhidong An,Junmou Zhou,Jiang Li
Catalytic transfer hydrogenation (CTH) recently attracts significant attention in biorefinery due to the free of using high-pressure fossil-derived H 2 that potentially reduce the equipment cost. Herein, up to 20 kinds of metal oxide-nitrogen-doped carbon (MO x -N-C) hybrid catalysts are prepared via a hydrothermal method followed by heat treatment under argon, and the successful preparation of such hybrid catalyst is confirmed by various means. Al is found to be the best element to construct such hybrid catalyst towards CTH, giving 96.6% yield of furfuryl alcohol at 99.3% furfural conversion at 120 o C for 6 h. By combining various characterization techniques, the deactivation and regeneration of AlOx-N-C catalyst is attributed to the change in specific surface area, pore volume, and the number of oxygen vacancies. The excellent catalytic performance of AlO x -N-C catalysts provides a broader prospect for its utilization in other biomass conversions as catalysts or active supports.
研究领域:
催化
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材料科学
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化学工程
·
生物化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Sui Mao,Jiliang Liu,Yuyong Pan,Jihoon Lee,Zhao Yao,Puran Pandey,Sundar Kunwar,Zhijun Zhu,Wenfei Shen,Laurence A. Belfiore,Jianguo Tang
Hybrid metal-oxide (MO)/metal nanostructures (MNSs) have been appealing in widespread optoelectronic devices due to their strong and tunable plasmonic activity encompassing selective scattering and absorption of wavelength depending upon the surface morphology and surrounding dielectric environment. In this paper, the various MO/Au NSs hybrid thin-films are fabricated via the solid-state-dewetting growth of Au NSs and sol-gel deposition of MO top-layers including ZrO x , CeO x , YO x and AlO x . Over 450% enhancements in maximum absorption are observed along with the peak redshift of 168 nm for the series of MO/Au NS films. The overall plasmonic properties undergo three regimes by the systematical control of film morphology: (I) Rapid enhancement, (II) Slow enhancement and (III) Decay. The optical evolution is correspondingly investigated with the assistant of finite-different time-domain (FDTD) calculation. This work may give an aid to the photo-electronic applications, such as photovoltaics , sensing and surface enhanced Raman scattering , based on hybrid MNSs especially on control of their plasmonic properties.
研究领域:
光电子学
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纳米技术
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材料科学
·
光子学
✓ 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）