POLYMERS FOR ADVANCED TECHNOLOGIES
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2022
·Vol. 33
·期 12
·4163-4173
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IF 3.348
Hu Wang,Xulian Hu,Zhaoxi Zhou,Qihui Chen,Maochun Hong,Heqing Fu
Successfully designed and synthesized PS@Ni@Cu core–shell composite microspheres, which provide efficient electronic transmission for anisotropic conductive films for electronic packaging applications. Herein, a simple method for preparing core–shell composite microspheres using Pickering emulsion polymerization as a template, a dense nano-nickel shell layer was coated on the surface of polystyrene to obtain PS@Ni microspheres, the microspheres have conductivity and magnetic properties. Then the microspheres were coated with nano-copper layer by electroless plating to enhance the mobility of electrons in specific media. Finally, the microspheres are laminated in epoxy resin, which can realize directional (horizontal, inclined, and vertical) movement under magnetic field force to form anisotropic conductive film. The conductivity is 171.68 S cm −1 , the adhesiveness and conductivity of the film can be changed by adjusting the content of microspheres. The film has excellent thermal stability, good adhesion, and can be anisotropic conductive. The difference in conductivity between the conductive direction and the insulating direction is about 10 8 orders of magnitude, and it can adapt to strong acids and alkalis and other more extreme environments. It is significance to the development of electronic packaging and is expected to be widely used in the field of electronic devices.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2023
·Vol. 108
·期 2
·477-489
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IF 2.5
Li Sijia,Duan Qiuling,Li Tao,Gao Xiang,Yang Xia,Bao Lin,Li Yan
Nanomaterials have been used as the electrodes of lithium-ion batteries during the past years. Designing nanomaterials with a simple method is significant for lithium-ion batteries that will be applied in electric vehicles and portable electronic devices. In this study, a simple one-pot strategy was used to grow MO x (M = Co, Ni, Cu) metal oxide nanoparticles on N-doped reduced graphene oxide (rGO) sheets. The MO x /N-doped rGO composites were subsequently studied as the anodes of lithium-ion batteries. Results demonstrated that the one-pot method effectively prevents the aggregation of nanoparticles and the restacking of graphene sheets, which is important to improve the electrochemical performance of composites. Electrochemical measurements of the three composites as anode materials exhibited the high reversible capacitance, rate capability, and cyclic stability. Graphical Schematic illustration of the three steps of one-pot method for growing metal oxide (MO x ) nanoparticles (NPs) on N-doped reduced graphene oxide (rGO): step1: multi-layers graphite (black spheres) was oxidized to graphite oxide (GO) containing functional groups (red spheres); step 2: multi-layers GO was exfoliated, and nitrogen (blue spheres) was modified on surface while metal ions (dark yellow spheres) were anchored on nitrogen; step 3: GO was reduced to rGO (black spheres with fewer red spheres) while metal oxide (light yellow spheres) formed on surface.
研究领域:
材料科学
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储能
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纳米技术
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电化学
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高影响因子
JOURNAL OF CATALYSIS
·
2018
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IF 6.759
Yanan Liu,Jiaying Zhao,Junting Feng,Yufei He,Yiyun Du,Dianqing Li
Environmental benign non-noble NiCu catalysts with well-distributed homogeneous nanoalloy structure was fabricated from layered double hydroxide for semi-hydrogenation of acetylene. Compared with monometallic Ni catalyst, the introduction of Cu enhanced ethene selectivity and decreased the deactivation rate in long-term reaction. Furthermore, to give a thorough understanding on structure dependent performance, conventional impregnation was also used to obtain bimetallic NiCu catalyst for comparison. Interestingly, imp-NiCu/MMO presented the mixture of monometallic Ni, Cu and bimetallic NiCu. Catalytic results indicated that 100% conversion was achieved at 160 °C with improved selectivity (>70%) over NiCu nanoalloy catalyst, while bimetallic NiCu catalyst with mixed structure showed both poor conversion (50%) and selectivity (65%). Enhanced activity was attributed to small particle size (3.2 nm) and high metal dispersion (31.4%). Improved selectivity and anti-coking ability were related to the alloying of Ni with Cu, which was conducive to isolate Ni atoms from one another confirmed by STEM-EDX and transfer electron from Cu to Ni certified by XPS. Additionally, superior performance was also found in semi-hydrogenations of hexyne, phenylacetylene, 1,2-diphenylethyne and ethyl phenylpropiolate over NiCu nanoalloy.
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JOURNAL OF SOLID STATE CHEMISTRY
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2024
·
IF 3.2
Hao Sun,Jingyi Yu,Cong Zheng,Sumei Wu,Tingting Yao,Zhiqiang Li,Nan Wang,Cunlei Zou,Weiwei Jiang,Hualin Wang,Shimin Liu,Chaoqian Liu,Wanyu Ding,Jiliang Zhang,Chuang Dong
Mg–Co–Ni–Cu–Zn–O is the firstly reported high entropy oxide (HEO) which has great promise in optoelectrical applications. However, the multicomponent and decreased configurational entropy by extracting one element from (Mg, Co, Ni, Cu, Zn) makes it difficult to synthesize single-phase medium entropy oxides (MEOs) especially when the cations are non-equimolar. In this paper, we synthesized different compositional-type of non-equimolar Co–Ni–Cu–Zn–O MEOs possessing single-phase rocksalt structure guided by the cluster-plus-glue-atom model. Interestingly, Co 21 Ni 43 Cu 16 Zn 16 O 96 and Co 17 Ni 47 Cu 16 Zn 16 O 96 have the lowest single-phase formation temperature (850 °C) when the total cation content is kept unchanged. Further increase or decrease of Co/Ni content (none, little, more) will increase the difficulty of single-phase formation ability and temperature (900–1200 °C). It is suggested the single-phase formation ability of Co–Ni–Cu–Zn–O MEOs is closely related to the Gibbs free energy ( ΔG ) and average cation-size difference ( δ ). The linear decrease of Co content and increase of Ni content can monotonously enlarge the energy band gap ( E g ) from 1.52 eV to 1.93 eV and increase the electrical impedance with five orders of magnitude (∼10 3 Ω–∼10 8 Ω), which may be valuable in the fields of optoelectrical devices.
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RENEWABLE ENERGY
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2020
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IF 6.274
Yunwu Zheng,Jida Wang,Can Liu,Yi Lu,Xu Lin,Wenbin Li,Zhifeng Zheng
To eliminate the problematic need for liquid phase, high temperature, and high pressure, as well as the excessive consumption of hydrogen and production of aromatic hydrocarbons, associated with traditional aviation oil preparation processes, Ni–Cu bimetallic catalysts were synthesized and evaluated for ex situ catalytic pyrolysis vapor upgrading of oleic acid under a N 2 atmosphere. The effects of catalyst support (AC, Al 2 O 3 , ZrO 2 , HZSM-5, HUSY, Hβ and MCM-41), pyrolysis process parameters (pyrolysis temperature, catalytic temperature and amount of oleic acid injected), and the mixing ratio of modified metals (Ni:Cu = 0:1,2,1:1,1:2,1:0) on the catalytic conversion of oleic acid to high-quality chemicals were studied. The catalysts were characterized by XRD , BET and NH 3 -TPD. Modified bimetallic catalysts show great potential for green diesel production without the use of H 2 feed. The abundance of Brønsted acid sites favors HDO routes (such as HZSM-5, HUSY, Hβ and MCM-41), while Lewis acid sites (such as ZrO 2 and Al 2 O 3 ) favor hydrogenation and decarbonylation reactions. The addition of Cu enhances the reducibility of Ni and inhibits the cracking reaction and deactivation caused by coke. The addition of Ni effectively promotes the conversion of oleic acid, accelerates the fracture of C–C and effectively improves the production of hydrocarbons. The highest conversion was 100% with 85.68% selectivity towards hydrocarbons under pyrolysis at 450 °C, a catalytic temperature of 500 °C, and a feed quantity of oleic acid of 0.25 ml/min using Ni–2Cu/MCM-41 catalysts, and the oxygen removal efficiency and selectivity of C17 hydrocarbon were the highest (85.68% and 26.77%, respectively). The main products were olefins . In addition, the regenerated catalyst had good stability and could be used for at least 3 reaction cycles without observation of significant deactivation.
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