JOURNAL OF LUMINESCENCE
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2019
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IF 2.961
Jinhui Zhang,Tongtong Xuan,Peng Li,Huanrong Li,Chengxin Wang,Jing Wang
Eu 3+ complexes are the prime candidates for luminescent down-shifting (LDS) converters of solar cells due to their high luminescent quantum efficiencies (LQE), large Stoke shifts and tunable excitation. However, their instability towards heat will shorten their life in solar cells, especially for outdoor use. Besides, the optical loss of the front glass and encapsulants will trade off the enhanced efficiency by photo-conversion. In this paper, highly emissive hybrid material Eu(PPO) n -C 4 Si@NZ (HY) was obtained by assembling europium complex into three different sizes of stable zeolite L functionalized with a water-soluble stopper. Then a bi-functional layer by incorporating HY (LDS) with anti-reflective SiO 2 was developed. Benefitting from the dual functions, the as-prepared cell with HY@SiO 2 film substrate manifests an increased external quantum efficiency (EQE) in both UV and the longer wavelength regions, compared with pure glass based c-Si solar cell. In the best case, the conversion efficiency of the c-Si solar cell is increased by a relative 3.30% (from 16.386% to 16.926%).
研究领域:
光伏技术
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材料科学
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太阳能转换
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发光材料
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纳米复合材料
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DOI
高影响因子
Nanocomposites
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2019
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IF 0
Lian Xiong,Shaodi Zheng,Zewang Xu,Zhengying Liu,Wei Yang,Mingbo Yang
In the present work, micropores and a low filler content of Ag@SiO2 nanoparticles (NPs) are synchronously introduced into polydimethylsiloxane (PDMS) film to obtain porous dielectric elastomeric composites. The morphology and dielectric and mechanical properties of the composites are investigated. The resulting composites possess high dielectric permittivity, low dielectric loss and low Young’s modulus, which is beneficial to the requirements of a dielectric elastomer actuator. This study provides an effective method to prepare high-performance PDMS-based dielectric porous dielectric elastomeric composites filled with low filler contents of Ag@SiO2 NPs.
研究领域:
材料科学
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聚合物复合材料
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介电材料
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智能驱动器
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纳米复合材料
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DOI
Catalysts
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2023
·Vol. 13
·期 2
·450
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IF 3.9
Muhammad Naeem Younis,Zhiheng Ren,Chunshan Li,Erqiang Wang,Jie Li
The advancing effects of various alkali and alkaline earth metals (inclusive of K, Ca, and Sr) modified Cu/SiO2catalysts, prepared with a modified precipitation-gel method, were investigated for the production of ethanol via hydrogenation of methyl acetate. Our results showed that Sr-doped catalysts exhibited the best and most consistent results during catalytic tests. A series of techniques, including X-ray diffraction technique, Raman spectroscopy, N2adsorption/desorption, N2O titration method, FTIR spectroscopy, and H2temperature, programmed desorption and reduction (TPD and TPR), and X-ray Photoelectron Spectroscopy, which was used to check the detailed characterization of Sr modification in the catalyst and its structural impacts on the properties of the catalyst. These results demonstrated that the addition of 5%Sr could strengthen the intrinsic stability of the catalyst by formulating the appropriate ratio of Cu+/(Cu0+ Cu+) to facilitate catalytic outcome improvement. The addition of 5%Sr-30%Cu/SiO2under the most favorable conditions, resulting in the peak conversion of MA (95%) and ethanol selectivity (96%), indicates its magnificent catalytic stabilizing effects. Furthermore, the best performing catalyst was compared and tested under various conditions (LHSV and temperatures) and a 300 h long life run.Keywords:hydrogenation;methyl acetate;ethanol;strontium
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高影响因子
ENERGY & FUELS
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2023
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IF 5.3
Yixue Yang,Qiang Hu,Guimin Zhang,Xun Xie,Yuxin Liu,Liming Zhou,Kejing Wu,Houfang Lu,Bin Liang
Supported Ni on yttria stabilized zirconia (YSZ) is the most widely used anode for a solid oxide fuel cell (SOFC), where Ni particles are easy to agglomerate at a high temperature of 1400 °C and reductive hydrothermal environments. In this study, Ni particles are successfully dispersed on YSZ through strong interaction between Ni and SiO2. The thin and amorphous SiO2 films, grown by low-temperature chemical vapor deposition (CVD), become spherical particles of nickel silicates uniformly dispersed on the YSZ skeleton after sintering at 1400 °C. Also, the SiO2-anchored Ni particles supported on YSZ (Ni/YSZ-SiO2) are obtained via direct reduction. The electrochemical performance of the Ni/YSZ-SiO2 anode shows a higher power density of approximately 18% than an unmodified Ni/YSZ anode, which resulted from the longer effective TPB area assigned to the highly dispersed Ni particles. The microstructure containing SiO2-anchored Ni particles exhibits high stability under testing and reductive hydrothermal conditions. Accordingly, the method of growing a SiO2 layer via low-temperature CVD is considered as a probable route for the preparation of the Ni/YSZ electrode material with a well-defined microstructure.
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DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2023
·
IF 3.5
Jiachen Chen,Jin Li,Beining Li,Zhuocheng Chen,Xue Bai,Long Zhang,Jin He
The development of advanced luminescent materials is highly desirable for developing the energy-efficient lighting technology. However, it is still challenging to achieve stable full-color tuning in the same matrix upon a single-beam light excitation so as to ensure the high color stability and consistency. Herein, Eu 3+ /Eu 2+ /Tb 3+ co-doped sintered nanoporous glass via the dipping strategy is fabricated, which can emit blue, green and red emissions simultaneously by simply modifying the thermal treatment temperature. This full-color tuning is attributed to the dual roles of the thermal reduction of Eu 3+ to Eu 2+ in Al 2 O 3 -SiO 2 glass and simultaneous emissions of Eu 3+ /Eu 2+ /Tb 3+ activators. The densification of nanoporous glass via sintering could effectively decrease the amount of hydroxyl groups that present in the glass matrix, resulting in 5 times enhancement of the photoluminescence intensity and longer photoluminescence lifetime of rare earth (RE) ions. The thermal reduction of Eu 3+ to Eu 2+ is due to the reduction environment provided by Al 3+ ions in the Al 2 O 3 -SiO 2 glass. The energy transfer (ET) from Eu 2+ to Tb 3+ , Eu 2+ to Eu 3+ and Tb 3+ to Eu 3+ have been investigated in detail. Based on the ET mechanism, rational PL spectra design was demonstrated by varying the concentration of Eu 3+ ions in solution. The Color Correlated Temperature (CCT) and the Color Rendered Index (CRI) values of the white light emission glass are 7420 K (Cold-white emission) and 80.85, the temperature dependent photoluminescence (TDPL) analysis reflects the white light emission glass possesses high thermal stability and excellent thermal restorability. This facile fabrication and full-color tuning of Eu 3+ /Eu 2+ /Tb 3+ co-doped sintered nanoporous Al 2 O 3 -SiO 2 glass may provide a novel luminescent material for white-light emitting diodes (WLEDs) application.
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高影响因子
ACS Applied Nano Materials
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2023
·
IF 5.9
Shicui Xing,Qiyan Ji,Xiuling Jiao,Dairong Chen
Fiber reinforcement is an effective method to improve the inherent brittleness of conventional aerogels. However, high-density and complex preparation processes plague fiber-reinforced aerogel composites (FACs). For example, they are usually prepared using costly supercritical drying, freeze-drying, and time-consuming atmospheric drying, limiting the further development in applications and technologies of the material. Herein, a straightforward route to FACs is proposed. Namely, electrostatically spun nanofibers are used as reinforcement materials for aerogels. The nanofiber composite silica gel precursors are produced using chemical swelling and sol–gel techniques. Direct calcination is then used to prepare FACs with distinct nanoporous structures. As a result, FACs have a thermal conductivity as low as 0.029 W m–1 K–1 at room temperature, a high porosity of up to 99.55%, and excellent temperature resistance, maintaining a stable porous structure even at 1400 °C. Therefore, FACs have greater potential for thermal insulation applications. The route described in this study will contribute to the opening of a pathway for the simple preparation of FACs with ultralow density and high temperature resistance, thereby promoting the application and development of nanofiber-reinforced aerogel materials.
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高影响因子
Surfaces and Interfaces
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2023
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IF 6.2
Jian Lan,Hongying Hou,Xiaohua Yu,Ju Rong,Fangshu Chen
Poor solid–solid interfacial compatibility has been a troubling challenge to the development of solid-state lithium metal batteries . For this purpose, inspired by mussel mimetic chemistry, the homogeneous ionic interfaces and channels between PVDF matrix and SiO 2 nanospheres were built by grafting sulfonate betaine (SB) on their surfaces via Schiff base reaction and ring opening reaction. Furthermore, the influence of SB-SiO 2 content on the structure, mechanical properties , thermal stability and electrochemical performances of the composite solid-state electrolyte was also studied. Desirably, Li + transference number and ionic conductivity of 8%SB-SiO 2 /SB-PVDF/LiTFSI electrolyte membrane were as high as 0.50 and 5.5 × 10 −5 S/cm, respectively, much higher than those of the counterparts in literatures. Uniform dispersion of SB-SiO 2 nanospheres in 8%SB-SiO 2 /SB-PVDF/LiTFSI electrolyte membrane built the homogeneous continuous ion channels, while the homogeneous structure of SB-PVDF and PVDF binder in the electrode also facilitated the interface compatibility of the membrane/electrode, and thus the synergistic effect improved the Li + transference number. The reversible specific capacity of LiFePO 4 // 8%SB-SiO 2 / SB-PVDF / LiTFSI // Li battery was 129.7 mAh/g at 1.0 C for 200 cycles, higher than those of other two electrolyte membranes, meanwhile, high-voltage LCO//8%SB-SiO 2 /SB-PVDF/LiTFSI//Li battery also exhibited good Li-storage performance, indicating high feasibility of 8%SB-SiO 2 /SB-PVDF/LiTFSI electrolyte membrane in solid-state lithium metal batteries .
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Xiaoting Zhang,Bin Cui,Yu Qiu,Rong Ma,Yueyao Fan
In this paper, morphology engineering was developed to optimize the overall temperature-stable energy storage performance of ceramic capacitors. First, SrSn 0.1 Ti 0.9 O 3 (SST) particles were coated on Na 0.5 Bi 0.5 TiO 3 (NBT) rods to form "core-shell" NBT@SST rods by a co-precipitation method to improve the relaxor behavior. And the rods were compounded with the Bi 2 O 3 -B 2 O 3 -SiO 2 (BBS) glass to dense into NBT@SST-BBS composites. The nanorods morphology of ceramic grains can increase the charge storage sites to induce higher polarization value. The moderate- ε r SST shell with highly lattice matching could lower the interfacial polarization between ceramic and glass phase so as to boost the breakdown strength. Comparatively, composites with nanorod morphology can reach the highest recoverable energy density of 2.19 J/cm 3 at 229 kV/cm with superior temperature stability ( Δε/ε 150 ° C ≤ 15% at 30–395 °C). We hope this work will give guidance to fabricate the next-generation dielectric capacitors through morphology engineering.
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
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IF 6.206
Bo Shu,Zhilang Liu,Zhaoqing Liu,Pengsong Li,Xin Li,Shaoheng Yang,Huangwei Chen,Jiqiang Liu,Zhuohong Yang,Yang Hu
Graphene oxide (GO) acted as an inorganic filler has attracted great attention in the construction of polymer-based composite coating film. Nevertheless, the high surface area, obvious van der Waals forces, and abundant hydrophilic groups of GO result in its poor dispersion behavior and compatibility in hydrophobic polymer , which greatly limits its widespread practical application. To solve the above issue, we have prepared SiO 2 -decorated GO (GO-SiO 2 ) nanoparticles using the sol-gel hydrolysis method. The FTIR, Raman spectra, XPS and SEM analysis displayed that GO-SiO 2 nanoparticles were successfully constructed and the SiO 2 nanoparticles are covalently grafted onto GO sheet surfaces. Moreover, the GO-SiO 2 nanoparticles are further employed as inorganic fillers into the non-solvent UV-curable castor oil-based polyurethane acrylate (COPUA) systems for the preparation of composite coating films. Herein, the GO-SiO 2 nanoparticles can be uniformly dispersed in hydrophobic COPUA-based coating precursor, and have favorable compatibility with COPUA resin. The incorporation of GO-SiO 2 nanoparticles into the coating film matrix would slightly decrease the gel content of coating films (all gel contents are above 91.5 %) while improving the hydrophobic property of coating films. Furthermore, the thermal stability and mechanical performance of coating films have reasonably enhanced trends by the incorporation of GO-SiO 2 nanoparticles. The prepared coating films display favorable acid, alkali, and solvent resistance , and the high content of GO-SiO 2 nanoparticles is beneficial to aggrandize the anticorrosion performance of coating films. This work provides a universal approach to modify GO sheets and construct multifunctional modified GO/polyurethane composite film for coating application.
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DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Chen Li,Yan Xiong,Lei Zhao,Haiqin Wan,Jun Li,Shenwen Fang,Meng Wang,Ming Duan,Jintian Ren,Yi Xiao
Experiment evaluation and mechanism analysis of separation performance are crucial for oily wastewater treatment. In this work, a fluorinated superhydrophobic/superoleophilic (F-SHPB/SOPL) surface was fabricated on a steel mesh substrate by double depositions of SiO2–TiO2 nanoparticles for high-roughness improvement and composite modification of fluorine-alkyl groups for low-energy achievement. Measurements of SEM, XPS, FTIR, laser scanning confocal microscope (LSCM), and excitation–emission matrix (EEM) were carried out for surface property characterization. The oil–water separation performances at the prepared F-SHPB/SOPL surface were investigated from experimental and simulation aspects. Separation tests, flux tests, and anti-contamination tests were performed by experimental methods. The results indicated that the surface showed excellent separation efficiencies (>99.2%) for oil–water mixture and oil-in-water emulsion, high permeate flux (>3000 L·m–2·h–1) for organic oils, and perfect anti-pollution/self-cleaning capacity for liquid and solid contaminations. The interaction energies and interaction distances were measured by ab initio molecular dynamics simulation (AIMD) simulations. With lower interaction energy (Eoil = −456.52∼−1044.22 eV) than that of water molecules (Ewater = −172.73 eV) and shorter distance (Doil = 4.42∼5.13 Å) than that of water molecules (Dwater = 11.49 Å), oil molecules showed higher interaction stability than water molecules on the F-SHPB/SOPL surface. The calculation revealed the essence of the oil–water separation phenomenon. This work not only proposes the fabrication methodology of the SHPB/SOPL material but also elucidates the intermolecular interaction for oil–water separation. The results can provide a fundamental basis for separation operation and removal treatment in industrial and domestic applications.
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Jia Ma,Jiang-Hua Zhang,Hua-Wei Zhang,Qian-Qian Du,Zi-Xuan Li,Zhi-Fei Yang,Sha-Sha Yang,Da-Yong Zhou
It is of great importance to develop a most efficient, recyclable, and ecofriendly process to produce novel structured phospholipid emulsifiers. Herein, innovative medium-chain structured phospholipid (MCSPL) emulsifiers were synthesized through transesterification of soybean lecithins with medium-chain fatty acids (MCFAs) promoted by Zn- or Al-incorporated Fe 3 O 4 @SiO 2 , denoted by Fe 3 O 4 @SiO 2 /M (M = Zn or Al). Resultingly, Fe 3 O 4 @SiO 2 /M (M = Zn or Al) exhibited the most superior reactivity with 97.1% or 88.7% MCFA incorporation to other benchmark catalysts and also had excellent magnetic separability and recyclability. Noticeably, targeted MCSPLs possessed almost more superior emulsifying properties to other phospholipid emulsifiers, and had potential for use as oil–in–water emulsifiers. Conclusively, the present findings demonstrate that transesterification promoted by Fe 3 O 4 @SiO 2 /M (M = Zn or Al) can be a promising approach for green, economic, and highly effective synthesis of novel dual-function phospholipid emulsifiers with bioactive and emulsifying properties in food, pharmaceutical, and cosmetic industries.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xingjie Dong,Jianqin Wu,Qing Zhou,Wenqing Wang,Xueqin Zhang,Lu Zhang,Rujie He
Si 3 N 4 -SiO 2 ceramics are considered as the preferred high-performance wave-transmitting material in the aerospace field. However, traditional fabrication methods for Si 3 N 4 -SiO 2 ceramics have the disadvantages of high cost and complicated fabrication process. In this paper, Si 3 N 4 -SiO 2 ceramics with excellent mechanical and dielectric properties were fabricated by digital light processing-based 3D printing combined with oxidation sintering. Firstly, the curing thickness and viscosity of slurries with different solid loadings for vat photopolymerization-based 3D printing were studied. Then, the effects of the sintering temperature on the linear shrinkage, phase composition, microstructure, flexural strength , and dielectric properties of Si 3 N 4 -SiO 2 ceramics, and the influences of solid loading on them were explored. The curing thickness and viscosity of the slurry with a solid loading of 55 vol% were 30 μm and ∼1.5 Pa‧s, respectively. The open porosity and the flexural strength of Si 3 N 4 -SiO 2 ceramic with a solid loading of 55 vol% were 4.3 ± 0.61% and 76 ± 5.6 MPa, respectively. In the electromagnetic wave band of 8–18 GHz, the dielectric constant of Si 3 N 4 -SiO 2 ceramics was within the range of less than 4, and the dielectric loss remained below 0.09. The method of digital light processing-based 3D printing combined with oxidation sintering can be further extended in the preparation of Si 3 N 4 -based structure-function integrated ceramics.
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高影响因子
危险品化学品经营许可证（带存储）