JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Qi Li,Jianliang Xie,Jin Hu,Xin Wang,Chengyong Yu,Shaoliang Jiang,Peng Liu,Chengli Sun,En Li,Longjiang Deng
The dielectric layer plays a key role in regulating electromagnetic wave broadband scattering based on meta-surface technology. Herein, the physical properties of composite powder, prepared by spray drying of CaO-B 2 O 3 -SiO 2 (CBS) glass-ceramic powder and Al 2 O 3 in different mass ratios, are systematically investigated. Meanwhile, a high enthalpy atmospheric plasma spraying equipment is utilized to prepare CBS/Al 2 O 3 composite coatings , and the morphology, physical properties and dielectric properties of the composite coating are analyzed. The XRD and DSC data of the composite coating reveal that the crystallization behavior of β-CaSiO 3 and CaB 2 O 4 gradually disappear with the increase of Al 2 O 3 content. Hence, only CaAl 2 Si 2 O 8 phase is observed during heat treatment. The experimental results confirm that the dielectric properties of CBS/Al 2 O 3 composite coating conform to the rule of mixture for composite materials. Also, the dielectric properties are affected by porosity and crystallization rate.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chunmei Li,Pingfan Zhang,Fang Gu,Lei Tong,Jizhou Jiang,Yan Zuo,Hongjun Dong
A new Au-θ-Al 2 O 3 /Au/PCN hybrid is fabricated by the collaborative design strategy of active site and assembled structure, which achieves highly efficient photocatalytic CO 2 reduction (CO 2 R) performance. The energy band structure of PCN is adjusted significantly owing to the strong coupling effect of Au-θ-Al 2 O 3 /Au nanosheets intercalated in PCN nanosheets. The result brings about up-shift of CB, VB and Fermi energy level overall and decrease of bandgap, which is in favor of harvesting visible light, exciting VB electrons and increasing reduction ability. In addition, the multiple built-in electric fields are induced by electron diffusion effect between structural units, due to the tight interface contact in the Au-θ-Al 2 O 3 /Au/PCN hybrid, which can effectively promote the separation of photoinduced charge carriers. Furthermore, the atomically dispersed Au atoms confined by the oxygen vacancies in Au-θ-Al 2 O 3 /Au can provide the plenty of effective active sites for CO 2 R reaction, and meanwhile, the localized surface plasmon resonance (LSPR) effect induced by Au nanoparticles on Au-θ-Al 2 O 3 /Au can improve the visible light response and produce abundant hot electrons to contribute to CO 2 R reaction. As a consequence, the average CO evolution rate of over the optimizing 10 %-Au-θ-Al 2 O 3 /Au/PCN hybrid (7.76 μmol g -1 h −1 ) reaches up to 3.53 times than that of PCN (2.20 μmol g -1 h −1 ) in the CO 2 R reaction, and maintains basically stable operation within 7 cycles of running, suggesting the superior activity and recyclability.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Shengbiao Sun,Zhicheng Shi,Liang Liang,Tong Li,Shulei Zhang,Wenfeng Xu,Mingli Han,Meiyu Zhang
Paraelectric/ferroelectric bilayer composites are promising candidates for high-performance dielectric capacitors. However, the energy densities of these composites need to be further improved to satisfy the miniaturization of electronic devices. Herein, an Al2O3/P(VDF–HFP) buffer layer is inserted between a paraelectric PMMA layer and a ferroelectric P(VDF–HFP) layer, forming a novel trilayer structure. It is interesting to find that the buffer layer effectively alleviates the huge electric field gap between the P(VDF–HFP) layer and PMMA layer, yielding substantially improved breakdown strengths (>600 kV/mm), which are over 140% that of the bilayer P(VDF–HFP)/PMMA composite (∼425 kV/mm). In addition, the introduction of the buffer layer also results in improved interfacial polarization, hence, the moderately elevated permittivity. Consequently, a high energy density of 10.03 J/cm3, which is about 260% that of the bilayer P(VDF–HFP)/PMMA composite (∼3.9 J/cm3), is achieved at 600 kV/mm. This work offers a facile strategy to achieve dielectric composites with high breakdown strengths, which is illuminating for the design of high-voltage energy-storage capacitors.
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2020
·Vol. 7
·期 10
·3047-3061
·
IF 7.683
Yang Bai,Fan Wu,Yanyan Gong
Antimony(III) or Sb(III) contamination in surface waters poses a serious threat to the ecological system and human health, and green and cost-effective technologies are urgently needed to mitigate its toxic effects. We green synthesized a novel oxidative sorbent, referred to as Al2O3-supported Fe–Mn binary oxide nanoparticles (Fe–Mn@Al2O3), and investigated its removal effectiveness and dynamic quantitative removal mechanisms of Sb(III) at environmentally relevant levels from simulated surface water. Fe–Mn binary oxides (Fe–Mn) were successfully attached on the surface of Al2O3via intermolecular hydrogen bonding, resulting in the formation of Fe–Mn@Al2O3 with a larger specific surface area, greater oxidizing reactivity, and more sorption sites compared to Fe–Mn. The resulting composite is mainly composed of FeOOH, Fe2O3, MnO2, and Al2O3. Life cycle assessment (LCA) indicated that the Fe–Mn@Al2O3 synthesis met green chemistry principles. Fe–Mn@Al2O3 at a Fe : Al2O3 molar ratio of 1 : 2 displayed an enhanced Sb(III) sorption capacity of 272.2 mg g−1 at pH 6.4 within 48 h. Sorption kinetic data were adequately simulated with the pseudo second-order kinetic model and the intraparticle diffusion model, suggesting that the sorption kinetics were a combination of chemisorption and intraparticle diffusion. The Freundlich isotherm model outperformed the Langmuir model in simulating the sorption isotherm data, which aligns with the heterogeneous surface sorption sites of Fe–Mn@Al2O3. MnO2 in Fe–Mn@Al2O3 oxidized Sb(III) to Sb(V), whereas FeOOH and Al2O3 acted as adsorption sites towards Sb(III) and Sb(V). Most importantly, Fe–Mn@Al2O3 still maintained high sorption efficiencies towards Sb(III) after five consecutive regeneration cycles. The dynamic quantitative removal mechanisms were proposed thereafter. Upon equilibrium, 92.8% of Sb(III) was sorbed by Fe–Mn@Al2O3, and 94.9% of sorbed Sb(III) was oxidized to produce Sb(V) and Mn(II). 59.1% of the formed Sb(V) was adsorbed onto Fe-Mn@Al2O3 and 40.9% of Sb(V) was released into the solution. The new quantitative and mechanistic insights contribute to an improved understanding of the uptake of Sb(III) by Fe–Mn@Al2O3 in natural and engineered systems, and the results may guide further preparation and application of reactive adsorbents for removal of redox-active contaminants from water.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Xianqing Zhu,Mian Xu,Shiyang Hu,Ao Xia,Yun Huang,Zhang Luo,Xiao Xue,Yao Zhou,Xun Zhu,Qiang Liao
Introducing waste plastics with high hydrogen contents (such as polyethylene) into the biomass gasification process is an effective way to upgrade the syngas . Despite their good catalytic abilities, some of the transition metals commonly applied for the co-gasification of biomass and plastic wastes are of high cost and have poor availability, which requires developing affordable transition metal-based catalysts with desirable catalytic performances for producing H 2 -rich syngas . Spent lithium-ion batteries , which have a huge annual output and pose a great threat to the environment, contain a high potential to prepare efficient catalysts for biomass and plastic co-gasification due to the richness of active transition metals (e.g., Ni, Co and Mn). Therefore, in this study, a novel Ni/Co/Mn-loaded mesoporous Al 2 O 3 catalyst was developed from the thermally decomposed spent LiNi x Co y Mn 1−x−y O 2 batteries (spent LIBs) for pinewood sawdust and polyethylene co-gasification as an effective means to achieve the zero-waste strategy. The results showed that Ni, Co and Mn could be non-selectively recycled from spent LIBs and uniformly loaded on γ -Al 2 O 3 support, and the support's mesopores were well-retained (average pore diameters around 11 nm). The highest H 2 productivity of the co-gasification could reach 17.16 mmol g −1 with a concentration of 36 vol% over the LIB-modified Al 2 O 3 . The modification by spent LIBs would enhance the catalyst's relative concentrations of acid-base sites in high-temperature regions, leading to the significant promotion of H 2 productivity from 600 to 800 °C (151.3%). Nickel and manganese in the LIBs were primarily responsible for the catalysis since their nanosized particles could endow the catalyst with accessible and reducible metallic sites for volatile reforming. The synergy among the Ni, Co and Mn could evidently intensify the oxygen vacancies of the LIB-modified Al 2 O 3 to promote the oxygen transfer reactions from steam to dissociative species for H 2 production. This study provided a novel and promising technology for synergistic valorization of spent lithium-ion batteries, biomass residues and plastic wastes to produce value-added H 2 -rich syngas.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Guangzhao Zhou,Ziyu Wang,Xiaochao Wang,Yiran Zhang,Xuteng Zhao,Qi Chen,Ting Chen,Zhen Huang,He Lin
Nonthermal plasma catalysis offers the potential to synthesize ammonia on a distributed scale under ambient pressure by consuming renewable electricity. Clarifying the relationship between plasma discharge and the role of catalysts is beneficial to the performance improvement of nonthermal-plasma-catalytic ammonia synthesis (NTPCAS). In this study, the plasma discharge was enhanced using CeO2 and Fe2O3/CeO2 (Fe/Ce) mechanically mixed with dielectric Al2O3, recorded as Ce@Al and Fe/Ce@Al, respectively, and the promoting effect of plasma discharge enhancement on the catalytic role of Fe/Ce and CeO2 in NTPCAS was investigated in a dielectric barrier discharge reactor under atmospheric pressure. The results indicate that the concentration of ammonia synthesized using Fe/Ce was only 2.7% higher than that synthesized using CeO2 and that synthesized using Fe/Ce@Al was 36.5% higher than that synthesized using Ce@Al and 102.6% higher than that synthesized using Fe/Ce at maximum. In addition, the ammonia production rate of Fe/Ce in Fe/Ce@Al with the optimum Al2O3 mixing ratio was 8.8 times that in pure Fe/Ce. U–I curves, U–Qc curves, and self-luminous optical imaging results of the discharge region packed with the catalysts indicated that Al2O3 mixing effectively strengthened the plasma discharge. Catalyst characterization showed that Fe/Ce had better catalytic properties than CeO2, explaining the better performance of Fe/Ce@Al than that of Ce@Al in the NTPCAS. In situ N2 and H2 adsorption, desorption, and reaction behaviors over catalysts revealed that significantly improved N2 adsorption and activation over Fe/Ce@Al under plasma conditions were the key to NTPCAS. The strategy of mixing highly active ammonia synthesis catalysts with discharge-enhanced materials can significantly improve the performance of NTPCAS catalysts, thus providing a novel approach to designing catalysts for NTPCAS.
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Shuaixia Hou,Wenlei Xie
Hierarchical porous materials have been considered as promising catalyst carriers due to their large specific surface area and multi-sized pore structure, which can efficiently reduce the mass-transfer resistance of macromolecular reactants as well as improve the exposure of the active sites. In this research, a series of hierarchical porous solid acid catalysts with dual metal oxide active centers, namely Mo/V@H-Al 2 O 3, was prepared by introducing Mo and V into hierarchical porous H-Al 2 O 3 carriers via a successive incipient wetness impregnation approach. The functional species, crystal structures, morphological features, and acidic properties of the synthesized Mo/V@H-Al 2 O 3 catalysts were explored using various characterization techniques. Results showed that this catalyst not only possessed the structural advantages of relatively large surface area and ordered hierarchical porous structure, but also contained dual Brønsted-Lewis acid sites. With the low-cost acidic oils as feedstocks, this catalyst can concurrently catalyze the oil transesterification and free fatty acid (FFA) esterification reaction with the oil conversion rate of 94.3 % and full conversion of FFA under the optimized conditions, achieving one-pot transformation of the acidic oil to biodiesel and thereby simplifying the laborious separation procedure. The synergistic effect between the hierarchical porous structure and the strong acidity was shown to boost the catalytic performance of this Mo/V@H-Al 2 O 3 catalyst for the efficient biodiesel production. The high moisture and FFA-tolerant capacity emerged for this catalyst, and it had good reusability during the biodiesel production process, still with above 80 % of oil conversion even after five cycles of reuse, endowing it to have the great potential for cost-effective and sustainable production of biodiesel in particular with low-cost acidic oils as feedstocks.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Weizuo Li,Jing Shi,Dafang He,Haiqun Chen
Catalysts with an open hollow structure can enhance the mass transfer capability of the catalyst during the reaction process, thereby further improving the catalytic performance. In this work, uniform and monodisperse flying-squircher-shaped Al-MOFs were synthesized via a solvothermal method. Furthermore, a hollow structure Al2O3-supported metallic Ni catalyst (termed Ni–Al2O3–HFA) was synthesized via the Kirkendall effect for the hydrogenation–alkylation cascade reaction by employing as-synthesized Al-MOFs as a carrier for impregnation of Ni(NO3)2·6H2O through further calcination and reduction. Various characterizations (e.g., XRD, HADDF-STEM, H2-TPR) were conducted to reveal the superior performance of the developed Ni–Al2O3–HFA catalyst compared to Ni/Al2O3–IWI (Al2O3 obtained from calcination of Al-MOFs) in cascade reaction between nitroarenes and alcohols. We hope to use the MOF template method via the Kirkendall effect to prepare hollow structure nanocatalysts, which can provide a guideline for the preparation of other hollow materials.
✓ 已验证
DOI
PubMed
高影响因子
IONICS
·
2021
·Vol. 28
·期 2
·767-777
·
IF 2.817
Zang Guojing,He Min,Liao Youhao,Li Minsui,Hong Mingyao,Li Weishan
To improve the comprehensive performance of fibrous membrane based on poly(methyl vinyl ether-alt-maleic anhydride) P(MVE-MA)- and poly(vinylidene fluoride-co-hexafluoropropylene) P(VdF-HFP)-blended copolymers, a small amount of nano-Al 2 O 3 was doped by electrospinning technique to apply for high-energy-density cathode material of nickel-rich LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) based Li-ion battery. The results indicated that the electrospinning membrane and corresponding gel polymer electrolyte (GPE) only doped with 3.0 wt.% nano-Al 2 O 3 presented the proper structure and delivered the best electrochemical characterization. Due to the uniform distribution of nanoparticles on the fibers with higher density, the specific surface area and porosity of the fiber membrane were increased, leading to the improved fracture stress of 172.0 MPa for the membrane and ionic conductivity of 2.1 × 10 −3 S cm −1 for the GPE at room temperature. Contributed from the proper pore structure and the enhanced interfacial stability, the capacity retention of 89.4% was achieved for the Li/GPE/NCA coin cell after 200 cycles in the voltage range of 3.0 V and 4.3 V under room temperature using the GPE doped with 3 wt.% Al 2 O 3 , compared with that of 63.6% for the GPE without nanoparticles. Similarly, the discharge capacity of the coin cell under 7 C rate (123.2 mAh g −1 ) maintained 65% of that at 0.3 C (189.4 mAh g −1 ), showing good rate performance of the developed GPE. Therefore, the significant improvement in electrochemical stability of the GPE achieved by doping a small number of nanoparticles provided a simple and feasible solution for the development of high-energy-density Li-ion batteries.
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Wuming Xie,Fengping Zhou,Xiaolin Bi,Dongdong Chen,Zijun Huang,Yuhui Li,Shuiyu Sun,Jingyong Liu
Nickel (Ⅱ)−ethylenediaminetetraacetic acid (Ni−EDTA) complexes are widely present in electroplating effluents. Owing to its chemical stability, Ni−EDTA is hardly removed in traditional Fenton/Fenton-like processes with conventional iron (Fe)−based catalyst. In this study, oxygen vacancies were introduced into our highly efficient and novel Fe 3 O 4 @γ−Al 2 O 3 catalysts using Cu doping for Ni−EDTA decomposition in Fenton−like system. Without noble−metal cocatalyst, the introduction of oxygen vacancies in Cu−doped Fe 3 O 4 @γ−Al 2 O 3 catalysts exhibit excellent Fenton−like activity even in neutral or alkaline conditions. Experimental results revealed that, without the aid of extra energy, Ni−EDTA complexes could be effectively decomposed over oxygen vacancies−based catalyst. Electron paramagnetic resonance (EPR), X−ray photoelectron spectroscopy (XPS), oxygen temperature−programmed desorption (O 2 −TPD), and hydrogen temperature−programmed reduction (H 2 −TPR) were used to get a deep insight into the decomposition mechanism. Additionally, by employing the Al−containing support, stable layered double−hydroxide phases of Ni Al could be formed, indicating that a synergy of oxidation and adsorption could simultaneously take place, which led to the recovery of released Ni 2+ ions and also reduction in secondary pollution. To investigate the decomposition process of Ni−EDTA over oxygen vacancies−based catalyst, liquid chromatography−quadrupole/electrostatic field orbitrap high resolution mass spectrometry (LC−MS/MS) was employed to identify the generated intermediates, and thus, a plausible decomposition pathway was successfully conceived.
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Zhuoqing An,Xiaolong Ni,Zhuang Ma,Yuan Gao,Jiajing Chen
To investigate the effects of La 2 O 3 and Fe 2 O 3 on the structure and high viscosity of the CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) glass system, the microstructure was analyzed using in-situ high-temperature Raman spectroscopy, and the viscosity was measured by high temperature hot-stage. A series of cluster models representing aluminosilicate systems modified by La and Fe ions were constructed, followed by geometric optimization and Raman spectral simulation via quantum chemistry ab initio calculations. The results indicates that the effects of La 2 O 3 and Fe 2 O 3 on both vibrational wavenumber and Raman scattering cross-section (RSCS) followed the order: La < (La + Fe) < Fe. The addition of La 2 O 3 and Fe 2 O 3 loose the glass network structure, and led to a progressive rise in the relative content of Q 0 , Q 1 , and Q 2 units, accompanied by a notable decrease in Q 3 and Q 4 units. Consequently, the high viscosity and viscous flow activation energy decrease with the addition of La 2 O 3 and Fe 2 O 3 , but Fe 2 O 3 has a more pronounced effect. Furthermore, based on the NBO/T for characterizing the microstructure, the relationship between viscosity and microstructure is quantitatively analyzed.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 22
·9382-9393
·
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.
✓ 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）