INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Xinxin Zhang,Shiyang Cheng,Wei Zhang,Cai Zhang,Nicholas E. Drewett,Xiyang Wang,Dong Wang,Seung Jo Yoo,Jin-Gyu Kim,Weitao Zheng
Ag/Pr6O11 catalysts supported by either Pr6O11 nanorods (Pr6O11-NRs) or nanoparticles (Pr6O11-NPs) were prepared by conventional incipient wetness impregnation. The nanocomposite of Ag/Pr6O11-NRs demonstrated a higher catalytic activity for CO oxidation than Ag/Pr6O11-NPs at lower temperatures. This improved performance may be ascribed to the mesoporous features and resultant oxygen vacancies of the Pr6O11 nanorods support, as well as the large surface area and homogeneous loading of Ag species. As a result, 98.7 and 100% CO conversions were achieved at 210 and 240 °C for Ag/Pr6O11-NRs, while Ag/Pr6O11-NPs require a temperature of 320 °C to obtain the 100% CO conversion rate. These findings reveal that Pr6O11-NRs is the preferable support, comparative to Pr6O11-NPs, for Ag/Pr6O11 catalysts, for CO oxidation.
研究领域:
催化化学
·
纳米材料科学
·
环境化学
·
表面科学
·
能源化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Peibo Li,Guoqiang Luo,Xiaoshan Zhang,Xiao Wang,Zhihao Wu,Yi Sun,Qiang Shen
As one of the most commonly used binary alloys , the effect of intermetallic compounds (IMCs) of Al-Cu alloys in powder metallurgy on their structure and properties is instructive for tailoring Al-Cu alloys for different applications. In this investigation, a series of Al-Cu-Ag alloys with varying Cu compositions were fabricated via hot pressing. TEM analysis identified CuAl 2 as the primary intermetallic compounds , with Ag existing in forms including Ag 2 Al, elemental Ag, and an Ag-(Cu) solid solution . The modulation of Cu content influenced the state of Ag and the mechanical behaviors of the Al-Cu-Ag alloy. Particularly, the high Al/Cu alloy, benefiting from a synergistic effect comprising stacking faults, nanoscale precipitates, and solid solutions, exhibited outstanding mechanical properties. Conversely, the Al-50Cu-3Ag alloys displayed significant brittleness , attributed to the adverse impact of large-scale intermetallic compounds and increased grain size due to the formation of CuAl 2 . The incorporation of nanoparticles effectively mitigated the grain size in high Al/Cu alloys. This study elucidates the correlation between the evolution of intermetallic compounds and composition in Al-Cu alloys, offering novel insights into the reinforcement of both Al-based and Cu-based alloys.
研究领域:
材料科学
·
金属学与热处理
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粉末冶金
·
结构材料
·
合金设计
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DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 25
·15177-15185
·
IF 10.7
Yu Tian,Li Ma,Zhifang Zhou,Guang-Kun Ren,Yuansen Li,Zhijie Wei,Yan Shi,Yiying Zhao,Yuan-Hua Lin
Efficient thermoelectric power generation requires a large applicable temperature range and correlated materials with outstanding dimensionless figure of merit values. Lead chalcogenides, especially PbTe-based materials, play a pivotal role in building thermoelectric devices for applications at intermediate temperature. However, the use of earth-scarce Te and the obstacles of achieving a high power factor and low thermal conductivity have limited progress in this field. Here, earth-abundant PbSe-based materials have been made by a simultaneous approach of combining self-propagating synthesis (SHS) and SPS techniques with optimized morphology engineering. Based on excess Ag doping and an ultrafast synthesis process, materials with parallel connections arising from enormous Ag2Se nanofibers with high hole mobility and Ag-doped PbSe with a small effective mass have been created, resulting in enhanced electrical properties. Meanwhile, multi-sized pores which modify the morphology have been formed during the reaction, leading to Ag-doped materials with low lattice thermal conductivity by reducing both the sound velocity and phonon mean free paths. Ultimately, a high figure of merit (ZT) of ∼1.2 at 773 K, and an average value of ∼1.1 over a range from 523 K to 823 K have been achieved for the Pb0.99Ag0.01Se sample. These findings, combined with the energy- and time-saving fabrication process, highlight the prospective commercialization of PbSe-based thermoelectric materials in the future.
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 10
·期 9
·7783-7793
·
IF 1.5
Fen Wang,Xian Jing Yang,Qi Guo Chen,Mei Chao,Chun An
Pd/Ag/Cu electrode was successfully prepared on Ag dendrites with Cu substrate (Ag/Cu) by galvanic replacement reactions, and was characterized by scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The electroreductive dechlorination reaction of 2,3-dichlorophenol on Pd/Ag/Cu electrode was investigated by cyclic voltammetry and in situ FTIR techniques. Compared with Pd/Cu, Ag/Cu and Cu electrodes, Pd/Ag/Cu electrode exhibited the highest electrocatalytic activity for electroreductive reaction of 2,3-dichlorophenol. C-Cl bond was broken by reaction of adsorbed 2,3-dichlorophenolate with (H) ads Pd on Pd/Ag/Cu electrode surface. The main intermediate was 2-chlorophenolate, and the final product was phenolate.
研究领域:
环境化学
·
电催化
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Rujing Wang,Jingyu Peng,Song Wang,Jialin Bai,Hanzhuang Zhang,Rongmei Yu,Wenyu Ji
Metal film electrodes are frequently adopted in flexible quantum-dot light-emitting diodes (FQLEDs) to form microcavity structures, which accelerate the recombination of excitons and thereby enhancing the efficiency of devices, especially under high driving current density. However, metal films prepared by thermal evaporation grow according to the Volmer-Weber nucleation mechanism, thereby resulting in the formation of numerous metal islands on the target substrate. The serious leakage current and light scattering (hence weakened microcavity effect) caused by these islands lead to inefficient FQLEDs. Here we fabricated a highly uniform and smooth Ag-based flexible electrode by utilizing an ultrathin polyethyleneimine as the nucleation-inducing seed layer. A smooth surface with a root-mean-square of approximately 3.7 nm and an ultralow sheet resistance of 3.65 Ω sq −1 have been obtained for the Ag film with a thickness of only 16 nm. Thus, a high-efficiency FQLED is achieved with the maximum external quantum efficiency up to 25.6 %. Furthermore, this device exhibits ultralow efficiency roll-off, characterized by the external quantum efficiency of over 20 % across an extremely wide luminance range, from 300 to 160,000 cd m −2 , meeting all display and lighting requirements.
研究领域:
光电子学
·
纳米材料
·
柔性电子学
·
量子点器件
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Rongkai Ye,Yanping Zhang,Yuyu Chen,Liangfeng Tang,Qiong Wang,Qianyu Wang,Bishan Li,Xuan Zhou,Jianyu Liu,Jianqiang Hu
Pt-based catalysts with novel structure have attracted great attention due to their outstanding performance. In this work, H2PtCl6 was used as both precursor and etching agent to realize the shape-controlled synthesis of Pt-modified Au@Ag nanorods (NRs). During the synthesis, the as-prepared Ag shell played a crucial role in both protecting the Au NRs from being etched away by PtCl62– and leading to an unusual growth mode of Pt component. The site-specified etching and/or growth depended on the concentration of H2PtCl6, where high-yield core–shell structure or dumbbell-like structure could be obtained. The shape-controlled synthesis also led to a tunable longitudinal surface plasmon resonance from ca. 649 to 900 nm. Meanwhile, the core–shell Pt-modified Au@Ag NRs showed approximately 4-fold enhancement in catalytic reduction reaction of p-nitrophenol than that of the Au NRs, suggesting the great potential for photocatalytic reaction.
研究领域:
纳米材料
·
等离激元学
·
催化化学
·
材料化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Plasmonics
·
2020
·Vol. 15
·期 6
·1855-1861
·
IF 2.335
Chen Meijie,Yan Hongjie,Zhou Ping,Chen Xingyu
A transparent display allows us to see both the projection image displayed on it and the view behind it at the same time, which can be widely used in the car windshield, shop windows, and so on. To achieve the transparent display with the simple and easily available plasmonic nanoparticles, plasmonic Au-Ag nanoparticles with the strong scattering ability were used to achieve the objective of selectively scattering red, blue, and green light for the transparent screen in this work. Firstly, the optimized size parameters for these three color transparent displays were obtained theoretically. On the other hand, plasmonic nanoparticles used for the blue and green color transparence screen were reported in the previous experiments. Finally, a red color transparent display with the wide viewing angle was made based on the optimized Au nanoparticles experimentally.
研究领域:
纳米光子学
·
材料科学
·
显示技术
·
等离激元学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Guijing Li,Xueqian Fang,Wenjie Feng,Jinxi Liu
The Ag/SnO 2 electrical contact materials with different doping concentration of Zr and Fe were successfully fabricated through self-assembly precipitation and powder metallurgy method. The microstructures of Ag-SnO 2 composite powders and the prepared Ag/SnO 2 contact materials were investigated by a Scanning Electron Microscopy (SEM) coupled with EDS and EBSD systems. The results showed that the SnO 2 nanoparticles with typical geometric shapes were formed and distributed in Ag matrix. The electrical conductivity of the Ag/SnO 2 materials was significantly increased by 16 percent with the doping of 3 wt% ZrO 2 in SnO 2 . The surface morphology of the Ag/SnO 2 materials after arc erosion was further characterized. The formation of the Sn(Zr)O 2 and Sn(Fe)O 2 solid solution in Ag/SnO 2 significantly improved the arc dispersion and arc erosion resistance. This work can offer a novel approach to design Ag/SnO 2 contact materials for good electrical performances.
研究领域:
材料科学
·
电气工程
·
复合材料
·
纳米材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 12
·16870-16875
·
IF 4.527
Yanlin Li,Wenyuan Duan,Jian Wei
Among various carbon materials, diamond stands out due to excellent physical and chemical properties. In this work, we designed Dia@SiO 2 @Ag composites combining diamond micropowder and Ag nanoparticles by a simple chemical method and obtained stable substrate for surface enhanced Raman scattering (SERS) owing to its high surface-to-volume ratio, low density, as well as close bond between diamond and Ag. As-prepared Dia@SiO 2 @Ag presented high activity to detect crystal violet and rhodamine 6G molecules, which was demonstrated by significantly enhanced SERS spectra and high enhancement factor values (10 8 -10 9 ). Moreover, Dia@SiO 2 @Ag also showed desired sensitivity, which was investigated by detection limit. Therefore, our study provided more theoretical support and broadened the functional applications of diamond, particularly in Raman detection.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
拉曼光谱
✓ 已验证
DOI
高影响因子
Journal of Bionic Engineering
·
2022
·Vol. 19
·期 2
·507-515
·
IF 2.995
Li Mingrui,Wei Yongjie,Ma Bowen,Hu Yang,Li Dongdong,Cui Xiaoqiang
The loosening of implant due to bacterial infection brings great difficulties to the implantation of bionic titanium devices. In this study, the Zeolitic Imidazolate Framework 8 (ZIF-8) and silver ions were added to the surface of titanium alloy to obtain a uniform coating, which has nice biological activity and antibacterial property. The material structure characterizations, such as X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), proved that titanium is successfully modified with ZIF-8 and silver ions. It has micro- and nano-level characteristics, rough porous morphology, and excellent apatite inducing ability. The water contact angle experiment shows that the addition of ZIF-8 greatly increases the hydrophilicity of material, which provides conditions for the attachment of osteoblasts. The polarization curve obtained from the electrochemical test proves that the addition of ZIF-8 coating improves the corrosion resistance of titanium. The release of silver ion has a strong growth inhibitory effect on E. coli , and exhibits excellent antibacterial properties. Therefore, the preparation of ZIF-8/Ag coatings on 3D printed titanium provides a new option for the development of orthopedic implants.
研究领域:
生物材料学
·
表面工程
·
纳米医学
·
骨科植入物
·
抗菌治疗
✓ 已验证
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 4
·627
·
IF 3.164
Chuanmei Liu,Jie Liu,Xin Ning,Shaojuan Chen,Zhengqin Liu,Shouxiang Jiang,Dagang Miao
A practical method for preparing multifunctional polypropylene (PP) nonwoven fabrics with excellent stability and durability was explored. First, the PP nonwoven fabric was sputtered by a magnetron sputtering system to form an Ag film on the surface of the fabric. Subsequently, the coated fabric was treated with dopamine. The fabrics were characterized by scanning electron microscopy (SEM), an energy dispersive spectrometer (EDS), electrical conductivity, electromagnetic interference shielding effectiveness (EMI SE), antibacterial activity, stability, and laundering durability. The results of the study revealed that the fabric was coated with Ag, and after the treatment with dopamine, the surfaces of Ag-coated fibers were coated with polydopamine (PDA). The fabrics still had a sheet resistance below ~15 Ω/sq and exhibited excellent EMI SE above ~25 dB, though few differences existed from the single Ag-coated sample. After the treatment with dopamine, the antibacterial activity of the fabric was enhanced. Meanwhile, the treated samples exhibited excellent resistance against sodium sulfide corrosion, which could enhance the stability of the Ag-coated fabric. Moreover, the laundering durability of the treated fabric was improved in the same process, whose lowest sheet resistance was ~18 Ω/sq and the EMI SE was ~8 dB more than single Ag-coated PP nonwoven fabrics. In conclusion, this method was considered to be effective in fabricating multifunctional, stable, and durable fabrics.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2026
·
IF 4.4
Shanbo Cui,Jialong Ma,Jingyan Lu,Yawen Liu,Chang Su,Feng Teng,Haibo Fan,Peng Hu,Xin Zhao,Jiaming Song
Photocatalysis offers a green and sustainable route for pollutant degradation, with the performance of photocatalysts being a critical factor. Recently, van der Waals materials have gained increasing attention in this field due to their favorable photocatalytic properties. In this study, a novel Ag/CdPSe3 composite was synthesized via chemical vapor transport, liquid-phase exfoliation, and liquid-phase chemical reduction methods. When the Ag:CdPSe3 molar ratio was optimized to 2:1 (denoted A2C1), the composite achieved a tetracycline hydrochloride removal efficiency of 91.69% within 60 min of illumination─1.99 times that of CdPSe3. The A2C1 composite also exhibited effective photocatalytic degradation toward multiple antibiotics, including ciprofloxacin, norfloxacin, and amoxicillin, demonstrating its broad-spectrum application potential. Trapping experiments identified photogenerated holes as the dominant active species, with superoxide radicals playing supporting roles. Mechanistic studies revealed that Ag modification enhanced light absorption in the near-infrared and partial visible regions, while the Schottky junction formed at the Ag/CdPSe3 interface facilitated efficient photogenerated carrier separation. Together, these factors contribute to the superior photocatalytic performance of A2C1. This work provides new insights into the design of high-performance photocatalysts based on van der Waals materials.
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DOI
PubMed
高影响因子
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