ACS Applied Electronic Materials
·
2021
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IF 3.314
Shicai Geng,Yanwei Wen,Binze Zhou,Zhaojie Wang,Zhaojin Wang,Pengfei Wang,Yao Jing,Kun Cao,Kai Wang,Rong Chen
Carrier balance and ion diffusive inhibition are crucial to the external quantum efficiency (EQE) and stability of perovskite quantum dot light-emitting diodes (PQLEDs). Herein, an inorganic ZnBr2 ligand is used to passivate the Br vacancy on the surface of the perovskite quantum dots and, thus, near-unity photoluminescence quantum yield is achieved. With respect to energy alignment and carrier balance, poly[bis(4-phenyl) (4-butylphenyl) amine] (poly-TPD) is chosen to match with 1,3,5-tris (1-phenyl-1H-benzimidazol-2-yl) benzene (TPBi), and the fabricated PQLEDs exhibit the maximum luminance as high as 92,279 cd m–2. In addition, an ultrathin Al2O3 layer is introduced between indium tin oxide (ITO) and poly(ethylene dioxythiophene):polystyrene sulfonate (PEDOT:PSS) via atomic layer deposition (ALD). The Al2O3 buffer layer can precisely control the hole transmission rate, balance the carrier injection, and realize the improvement of EQE from 2.86 to 4.81%. The T50 lifetime of the device is extended by about 30 times due to suppression of metal ion diffusion from ITO to the emission layer. Our work demonstrates the promising fabrication of highly efficient and stable PQLEDs via ALD interface engineering.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Pengcheng Wang,Jun Liu,Peiwen Xu,Xinzhen Feng,Weijie Ji
Three morphologically uniform γ-Al 2 O 3 crystallites [Al 2 O 3 hexagonal plates (Al 2 O 3 -HP), stacked hexagonal plates (Al 2 O 3 -SHP) and rods (Al 2 O 3 -R)] were controllably synthesized. The Co-Mo oxide precursor was loaded on these γ-Al 2 O 3 substrates via aqueous incipient wetness impregnation and transformed to the sulfides under 10% H 2 S/H 2 (v/v) atmosphere. The mainly exposed facet of Al 2 O 3 -HP and Al 2 O 3 -SHP was identified to be the (1 1 0) and (1 0 0)/(1 1 1), respectively; whereas a polycrystalline structure was observed over Al 2 O 3 -R. The original structural feature of oxide precursors, i.e., 2D polymeric/monomeric as well as 3D polymeric/MoO 3 species substantially varied over Al 2 O 3 -HP, Al 2 O 3 -SHP, and Al 2 O 3 -R, which in turn determines the effectiveness in sulfidation of surface oxide precursors. The richness of MoS 2 /Co 9 S 8 /Co-Mo-S species, and less fraction of partially sulphurated CoMoO x S 2 as well as CoO x /SO x 2− entities were recognized over Al 2 O 3 -HP. Based on the areal activity at 250 °C, the sulfides-Al 2 O 3 (1 1 0) interface is approximately 6–13.8 times more active than the poly-crystalline or commercial γ-Al 2 O 3 supported sulfides for water gas shift (WGS) in a hydrogen-rich stream. The sulfides-Al 2 O 3 (1 1 0) interface also notably outperformed the sulfides-Al 2 O 3 (1 0 0)/(1 1 1) interfaces for the reaction.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
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IF 6
Jida Wang,Zhangshuai Ding,Feng Shi,Yifei Chen,Defa Hou,Fulin Yang,Can Liu,Yi Lu,Xu Lin,Zhifeng Zheng,Yunwu Zheng
An efficient and highly selective CaO-MgO-promoting γ-Al 2 O 3 decarboxylation catalyst was fabricated with different CaO to MgO ratios via a ball-milling method for regulating product distribution and production of gasoline-kerosene-diesel hydrocarbons via the catalytic copyrolysis of oleic acid (OA) and methanol under hydrogen-generating conditions. In addition, influencing factors, reaction mechanisms, possible reaction pathways and deactivation mechanisms were probed. The results showed that combining Ca, Mg and AlOx was vital for boosting oleic acid conversion, and synergy between metal and acid active sites via strong metal-support interactions enhanced deoxygenation-cracking activity. High-alkalinity CaO boosted C-C/C C bond cleavage, and MgO provided medium-strength Lewis acid sites; additionally, a large BET surface area and mesopore volume suppressed excessive hydrocracking reactions, improving biogasoline yield. Methanol addition provided active hydrogen atoms to enhance biogasoline selectivity at the expense of diesel and heavy oil production via olefinic cycles and aromatic cycle mechanisms and reduced coke deposition. The maximum hydrocarbon and biogasoline yields of 94.53% and 57.59% were achieved at OA/methanol= 5:1 and pyrolysis/catalytic temperature= 450/500 °C with1 g catalyst at a feedstock input rate of 0.1 ml/min.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 22
·9382-9393
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IF 4.5
Wang Bingying,Zhang Keke,Gao Yijie,Liu Peng,Liu Bo,Zhang Zhansheng
The trend toward miniaturized and highly integrated chip packaging has created a pressing need for lead-free solders with high strength, toughness, and conductivity. In this paper, we designed a scheme of Al 2 O 3 -modified nanomaterial-reinforced low silver Sn1.0Ag0.5Cu (SAC105) solder matrix. To begin with, a novel amorphous carbon and nickel core–shell structure plating modified on Al 2 O 3 (C/Ni/Al 2 O 3 ) were prepared by the electroless plating method. Then, the nano-C/Ni/Al 2 O 3 particle as reinforcement phase was mixed into the matrix solder alloy by ultrasonic vibration stirring. Finally, the morphology and relationship between coated carbon, deposited nickel and original solder interface were analyzed. The microstructure and main properties of the modified solders were also investigated. The experimental results suggested that amorphous carbon and nickel film were prepared on the surface of Al 2 O 3 by electroless plating method. The outer layer of nano-Al 2 O 3 was coated with non-uniform thickness of nickel and carbon coatings. The mass percentage of amorphous carbon was about 3.50%. Adding C/Ni/Al 2 O 3 (0–0.5%) into the SAC105 solder matrix resulted in a gradual increase in conductivity and wettability. The strength and toughness of the modified solder alloy improved as well with the adjunction of reinforced phase. The tensile fracture surface exhibited from a mixture of ductile and brittle, characterized by dimples and cleavage surface, to a purely ductile mode consisting mainly of dimples.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
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IF 6.3
Dongmei Han,Xibo He,Yicheng Hou,Boxi Geng,Hao Zhang,Bachirou Guene Lougou,Yong Shuai
While thermal energy storage (TES) systems are becoming crucial to the stable operation of solar power plants, molten salt packed bed thermal energy storage (PBTES) systems attracted widespread attention due to their wide operating temperature range and low cost. However, achieving high-efficiency thermal storage systems is still a datum challenge to meet the higher energy demand, as well as sustainable development and utilization of renewable energy systems. This study developed spherical capsules employing nanocomposite salts (MgCl 2 –KCl–NaCl/Al 2 O 3 nanoparticles) as composite phase change materials to experimentally study the heat storage process of a high-temperature PBTES prototype experimental system. Also, the heat storage performance of the PBTES system under different operating conditions is further investigated. The results showed that the nanocomposite salt gradually melted along the flow direction of the heat transfer fluid by exhibiting three-stage characteristics including solid phase sensible heat, phase change latent heat, and liquid phase sensible heat. Also, the temperature difference inside and outside the capsules showed the characteristics of peak-trough-peak. The PBTES system reached a heat storage density of 1290.51 MJ m −3 at a thermal efficiency of 86.95 %. The average heat storage rate increased by 49.55 % and the heat storage time was shortened by 29.67 % when the blower speed was increased from 800 r·min −1 to 1200 r·min −1 . The experimental results implied that the PBTES system encapsulating nanocomposite salts has excellent thermal performance. This study demonstrated solving the problems of insufficient thermal energy supply in time or space and improving energy utilization could result in a high-efficiency thermal storage system.
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MATERIALS CHEMISTRY AND PHYSICS
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2024
·
IF 4.3
Yonghui Yang,Hengwei Yan,Pengchen Yang,Zhanwei Liu,Guang Yang
The segregation of aluminum-silicon alloys directly impacts the mechanical and chemical properties of the alloys, Therefore, homogenization of alloys is of great significance for alloys. This study initially investigated the electrochemical behavior of aluminum (III) and silicon (IV) during the preparation of aluminum-silicon (Al-Si) alloys in NaF-AlF 3 -Al 2 O 3 -SiO 2 molten salts through cyclic voltammetry and steady-state polarization. The results revealed that Al 2 O 3 underwent one-step reduction to Al, whereas SiO 2 underwent a two-step reduction process to Si. In addition, electrolysis experiments were carried out in a NaF-AlF 3 -Al 2 O 3 -SiO 2 -5wt%CaF 2 -1wt%MgF 2 -2wt%LiF molten salt system with molecular ratio of 2.4. These experiments involved variations in current density, electrolysis time, Al 2 O 3 and SiO 2 additions. It is worth noting that under the conditions of current density of 0.7 A/cm 2 , electrolysis time of 2 h, and silica addition of 2 %, the reduction rate of silicon reached a maximum value of 72.57 %, at which time the silicon in the aluminum-silicon alloys showed a dendritic structure, which was uniformly distributed throughout the entire alloy, and the segregation of the alloy was effectively avoided.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Bingning Wang,Yeshuang Wang,Zhen Wang,Song Yang,Chao Yang,Jiawei Kou,Huiling Fan,Ju Shangguan
In this study, we report a simple strategy to enhance the low-temperature catalytic performance of γ-Al 2 O 3 for carbonyl sulfide (COS) hydrolysis by regulating the dissociation of H 2 O. Specifically, tetrabutylphosphonium chloride (TBuPC), an ionic liquid, was introduced onto γ-Al 2 O 3 via ultrasonic impregnation. There was a strong interaction between Cl in TBuPC and Al sites in tetrahedral interstices of γ-Al 2 O 3 , and Al sites in octahedral interstices were acted as main adsorption sites of H 2 O. Additionally, the hydrogen bond Cl···H-O lowered the dissociation energy of H 2 O on Al sites in octahedral interstices of γ-Al 2 O 3 , leading to the generation of abundant basic –OH groups, which served as active sites for COS adsorption and hydrolysis. Consequently, 3TBuPC/γ-Al 2 O 3 achieved 100 % COS conversion at 60 °C, which was 2.05 times higher than that of γ-Al 2 O 3 . The catalytic mechanism of COS hydrolysis over 3TBuPC/γ-Al 2 O 3 involved the following steps: (1) H 2 O was adsorbed on the γ-Al 2 O 3 surface and dissociated, generating H* and basic –OH groups; (2) COS was adsorbed on the –OH sites, forming the intermediate HSCO 2 - ; (3) HSCO 2 - reacted with H* to release CO 2 and H 2 S. This significant enhancement provides a new insight for the design and development of low-temperature hydrolysis catalysts.
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FUEL
·
2025
·
IF 7.5
Xinglin Wen,Yonglu Yang,Yong Pan,Jitao Hu,Xiaoyue Wan,Yanhui Yang,Sébastien Leveneur,Juncheng Jiang
The hydrogenation of 2,4-dinitrotoluene (2,4-DNT) into 1-methyl-2,4-cyclohexanediamine (2,4-MCHD), a significant yet underutilized raw material for the synthesis of methylcyclohexane diisocyanate (HTDI) with exceptional properties, represents one of the most promising reactions for the development of diisocyanate chemical processes. In this study, we developed a highly efficient and stable heterogeneous catalytic system for the direct hydrogenation of 2,4-DNT to 2,4-MCHD using Li-modified γ-Al 2 O 3 supported Ru nanoclusters (Li-modified-Ru/γ-Al 2 O 3 ). Under mild reaction conditions, we successfully inhibited side reactions, such as deamination, achieving a selectivity exceeding 95% for 2,4-MCHD, while the conversion of 2,4-DNT surpassed 99%. Kinetic studies revealed that the hydrogenation of 2,4-DNT in this system occurs as a tandem reaction, with the hydrogenation of the benzene ring identified as the rate-determining step. Investigations into the structure–activity relationship indicated that the valence state of the Ru nanocluster, the acid-base properties of the catalyst, the modification by Li, and the synergistic effects of various elements within the catalyst are critical factors contributing to the high activity and stability of the Li-modified-Ru/γ-Al 2 O 3 catalyst for the hydrogenation of 2,4-DNT to produce 2,4-MCHD. This work represents the first example of the direct hydrogenation of dinitroaromatic compounds to yield diamino aliphatic compounds and provides a solid foundation for understanding such reaction systems.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Xiaolu Guo,Huabing Li,Cheng Wang
The envelope structures hardly have the service life up to the design life in severe cold area. Polymer/nano-materials composite coatings are used to enhance the freeze-thaw durability of wall materials. Municipal solid waste incineration fly ash and fly ash were used to fabricate solid wastes-based autoclaved wall blocks (SW-AWBs) with hydrothermal synthesis method. Nano-Al 2 O 3 and graphene nanoplatelets were modified by the coupling agent and used to prepare composite coatings with triethoxy(octyl)silane. Effect of different coatings on the durability of SW-AWBs was compared and discussed. The results showed that the specimens surface changed from hydrophilic to hydrophobic after treated by composite coatings. Meanwhile, the capillary absorption coefficient of SW-AWBs decreased by 57.3%–78.8% and 92.4%–94.1% after treated by triethoxy(octyl)silane/nano-Al 2 O 3 and triethoxy(octyl)silane/graphene nanoplatelets coatings, respectively. Under 15 freeze-thaw cycles, the mass loss of SW-AWBs dropped by 61.9% and 69.4%, the strength loss reduced by 70.5% and 79.4% after treated by triethoxy(octyl)silane/nano-Al 2 O 3 and triethoxy(octyl)silane/graphene nanoplatelets coatings, respectively. Overall, triethoxy(octyl)silane/graphene nanoplatelets had a superior effect on improving the freeze-thaw durability of SW-AWBs than triethoxy(octyl)silane/nano-Al 2 O 3 .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jia Yang,Haoyue Li,Xin Yue,Qiuguang Zhang,Mengchun Fu,Jiujie Xu,Ke Li,Ce Wang,Panpan Lin,Peng He,Tiesong Lin,Yanli Zhuang,Han Mei,Yue Liu
Stress relaxation plays a key role in ceramic/metal joints, and reliable information is crucial for developing multilayer composite fillers and reaching promising joint strengths. There are currently limited relevant experimental studies due to the difficulty in detection. Taking the Al 2 O 3 /stainless steel joint as an example, the study gives a new method to unveil the role of elastic-plasticity of sandwich composites in stress relaxation. By using the thermo-hydrogen treatment technology, the joint strength was almost only affected by the thermal mismatch at a fixed brazing parameter, which can be an indirect indicator of stress relaxation. In the meantime, it is a promising method for stress relief. It was found that the joint strength, which corresponds to the residual stress relaxation, was promoted by the presence of hydrogen, which corresponds to the elastoplastic properties of the fillers. This dependency was amplified in the harder/softer/harder structure. Finite element analysis verified the experiment results by calculating the stress concentration, strain energy density, equivalent moment, and shear forces at stress-concentrated regions because the more ductile interlayer had higher strain but lower stress, and easier plastic deformation during the brazing process. The occurrence of dislocation movement, grain boundary slip, stacking fault, and dynamic crystallization played a significant role in the plastic deformation.
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Small Methods
·
2025
·
IF 9.1
Yaping Wang,Tingshi Zhang,Xinlian Huang,Yurong Zeng,Siyuan Wei,Zanyong Zhuang,Chongbing Zhu,Yan Yu
Herein, a versatile amorphous-to-crystalline transformation (ACT) strategy is described, to furnish various metals (Cu, Co, Ni, Cs, and Y) based atomically dispersed catalysts (ADCs) on thin holey 2D Al 2 O 3 . This approach, which involves adjusting reactant stoichiometry, enables the continuous modulation of particle size of ADCs at an atomical level, giving the ultrafine products as single atom, cluster, or nanoparticle catalysts. This synthesis method allows a straightforward analysis and comparison of the reactivity of the ADCs catalysts based on the dispersion of the active metal. In the case of Cu, the cluster catalyst 0.2-Cu/Al 2 O 3 outperforms the single atom catalyst 0.1-Cu/Al 2 O 3 and the nanoparticle catalyst 0.3-Cu/Al 2 O 3 in the oxidation of refractory organic molecules, thanks to its superior electron transport and surface adsorption properties. These findings are well supported by the Density functional theory (DFT) calculations. Additionally, this method facilitates the preparation of atomic clusters with a very small size of 0.5–1 nm, composed of just a few atoms, as exemplified by Ni-based ADCs. The developed synthesis enriches the library of ADCs and demonstrates the potential of amorphous-to-crystalline transformation in creating advanced ultrasmall functional materials.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wei Liu,Jianwei Liang,Chong Fu,Baobao Zeng,Meipeng Huang,Gao Yang,Xudong Luo,Di An,Sai Wei,Zhipeng Xie,Guangzhou Xu
The coal fly ash (CFA) produced from coal-fired power generation is classified as a common solid waste; thus, improving the recovery and utilization rate of CFA is highly desirable. In this study, a novel strategy using CFA and Al 2 O 3 as raw materials, to prepare hierarchically porous ceramic composites that serve as potential candidates for future building materials is developed. In this process, the well-developed self-assembly method in which an anionic modifier is used to prepare hydrophobic powders that form an attractive oil/water network via electrostatic interactions , thereby yielding honeycomb-like structures. In order to explore the mechanism of preparation, five samples with different mixture ratios of alumina and CFA were prepared according to 1: 0, 2: 1, 1: 1, 1: 2, and 0: 1 (Alumina: CFA). Compared with the sample prepared with pure CFA, the as-prepared CFA/Al 2 O 3 composite exhibited both superior porosity and high mechanical property. When the porosity is as high as 73 ± 0.17%, the compressive strength is as high as 80.9 ± 3.4mpa (alumina: CFA = 1:1). As the porosity decreases to 49.3 ± 0.7%, the compressive strength reaches 159.33 ± 36.89mpa (alumina: CFA = 1:2). Moreover, this work obtains the highest compressive strength-porosity related B-value in comparison to previously reported CFA-based composites and provides a new insight into the effective recycling of CFA and offers a novel approach to prepare CFA/Al 2 O 3 composite with excellent overall mechanical properties .
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危险品化学品经营许可证（带存储）