PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 46
·31754-31769
·
IF 3.3
Wenhao Pan,Changjiang Yang,Lei Zhou,Xiaolan Cai,Yankun Wang,Junhao Tan,Jun Chang
This study aimed to address the challenges associated with silicon (Si) anode materials in Li-ion batteries, such as their large volume effect and poor electrical conductivity. To overcome these limitations, a novel composite microsphere called pSi/Ag was developed using quartz waste through a combination of high-energy ball-milling, spray drying, and magnesiothermic reduction techniques. The morphology and structure of the pSi/Ag composite were thoroughly characterized using various methods, including X-ray diffraction, field-emission scanning electron microscopy, and transmission electron microscopy. The results revealed that the Ag nanoparticles were uniformly dispersed within the porous micron-sized Si sphere particles, leading to enhanced electrochemical performance compared to pure porous silicon that did not undergo the spray drying process. The use of micron-sized Si prevented the excessive formation of the solid electrolyte interphase film, and the pSi/Ag-5 anode, prepared with 5 wt% AgNO3 as a precursor, demonstrated an impressive initial Coulombic efficiency of 92.8%. Moreover, a high specific capacity of 1251.4 mA h g−1 over 300 cycles at a current density of 4000 mA g−1 was attributed to the improved conductivity provided by the Ag nanoparticles in the Si matrix. The straightforward synthesis method employed in this study to produce pSi/Ag presents a promising approach for the future development of high-performance silicon anodes in Li-ion batteries.
研究领域:
材料科学
·
储能
·
纳米技术
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Yilong Huang,Yanhong Tian,Chunjin Hang,Yubin Liu,Shang Wang,Miaomiao Qi,He Zhang,Qiqi Peng
Silver nanowires (AgNWs) are the most promising materials to fabricate flexible transparent electrodes (FTEs) that are used in next-generation electronics. However, there are several bottlenecks for AgNW-based FTEs to achieve large-scale applications, which include the thermal instability and rough surface topography of AgNWs and the poor interfacial adhesion between AgNWs and the used substrate. To simultaneously address these aforementioned issues, a robust and washable FTE is prepared based on a AgNW@TiO2 core–shell network embedded in polyimide (PI) substrate through a facile and scalable solution-based process. After being treated with TiO2 sol, an ultrathin, conformal, and continuous TiO2 shell is coated on the AgNWs, which can effectively suppress the atomic surface diffusion. In comparison with a pristine AgNW network that breaks into nanorods and nanospheres at 250 °C for 10 min, the AgNW@TiO2 core–shell network is stable at 300 °C, and its resistance just increases by a factor of 11 after being annealed at 400 °C for 1 h. Furthermore, the TiO2 shell simultaneously increases the electrical and optical properties of the AgNW network. After PI precursors are flowed, dried, and thermally cured, the AgNW@TiO2 core–shell network is embedded on the surface of the PI substrate with a surface roughness of 1.9 nm. In addition to high thermal stability, the conductivity of the AgNW@TiO2–PI composite FTE remains almost unchanged after repeated peeling off cycles with 3M tape and mechanical bending cycles. It is also demonstrated that the AgNW@TiO2–PI composite FTE is washable, and the relative change in resistance (ΔR/R0) is ∼12% after 100 washing cycles, in which a variety of stress situations occur in combination.
研究领域:
材料科学
·
纳米技术
·
柔性电子学
·
透明导电薄膜
·
表面工程
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Wenjing Xu,Hengquan Yang,Chengyan Liu,Zhongwei Zhang,Chunguang Chen,Zhenyuan Ye,Zhao Lu,Xiaoyang Wang,Jie Gao,Junliang Chen,Zhengchuan Xie,Lei Miao
As a lead-free thermoelectric material, SnTe is inhibited by its inherent high carrier concentration and high thermal conductivity. This work describes the synergistic effect on the modulation of band structure and microstructural defects of SnTe by Ag and Y codoping, which gives rise to band convergence and multiple microstructural defects (secondary phases, dislocations, and boundaries) in the matrix and endows Sn0.94Ag0.09Y0.05Te with an increased power factor of ∼2485 μW m–1 K–2, an extremely low lattice thermal conductivity of ∼0.61 W m–1 K–1, and a peak zT as high as ∼1.2 at 873 K. This work reveals that the combination of Ag and Y could play a role in the synergistic optimization of electronic and phonon transport properties of SnTe by modifying the band structure and microstructures, providing guidance for enhancing the thermoelectric performance of the relevant materials.
研究领域:
材料科学
·
热电学
·
半导体物理
·
能源材料
✓ 已验证
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2014
·Vol. 30
·期 9
·1667-1673
·
IF 0.886
XUE Qing-Rui,LI Jian-Ling,XU Guo-Feng,HOU Peng-Fei,YAN Gang,DAI Yu,WANG Xin-Dong,GAO Fei
A lithium-rich solid-solution layered cathode material, Li[Li0.2Mn0.54Ni0.13Co0.13]O2, was synthesized using a fast co-precipitation method, and surface modified withAg/C via chemical deposition. The electrochemical properties,
structures, and morphologies of the prepared samples were investigated using X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), galvanostatic charge-discharge cycling, cyclic voltammetry (CV), electrochemical impedance
spectra (EIS), and energy dispersive X-ray spectroscopy (EDS). The XRD results showed that the pristine and Ag/Ccoated cathode materials both have hexagonal α-NaFeO2 layered structures with the R3m
space group. Microscopic morphological observations and EDS elemental mapping showed that a uniform Ag/C coating layer of thickness 25 nm was deposited on the surfaces of Li[Li0.2Mn0.54Ni0.13Co0.13]O2 particles. The Ag/C-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2
material gave an excellent electrochemical performance. The initial discharge capacity (0.05C) of the Ag/C- coated sample was 272.4 mAh ·g-1, with an initial coulombic efficiency of 77.4%, corresponding to 242.6 mAh·g-1 for the pristine sample, with an initial
coulombic efficiency of 67.6%, in the potential range 2.0-4.8 V (vs Li/Li+). After 30 cycles (0.2C), the Ag/C-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 retained a capacity of 222.6 mAh·g-1, which was 14.45%
higher than that of Li[Li0.2Mn0.54Ni0.13Co0.13]O2. We also found that the Ag/C coating improved the rate capability of the solid-solution material Li[Li0.2Mn0.54Ni0.13Co0.13]O2. The
capacity retention (1C) of the Ag/C-coated sample was 81.3%, compared with the capacity at 0.05C. CV and EIS results showed that the Ag/C coating layer suppressed the oxygen release in the initial charge progress and lowered the surface film resistance and electrochemical reaction resistance
of the pristine sample.
研究领域:
材料科学
·
电化学
·
储能
·
锂离子电池
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiang Ran,Ye Du,Zhenzhen Wang,Huan Wang,Fang Pu,Jinsong Ren,Xiaogang Qu
Developing methods of decreasing the harm to cell and increasing the antibacterial efficiency is becoming a potential topic of medical treatments. We demonstrated a hyaluronidase-triggered photothermal platform for killing bacteria based on silver nanoparticles (AgNPs) and graphene oxide (GO). The property of the hyaluronidase (HAase)-triggered release provided excellent antibacterial activity against Staphylococcus aureus. Upon illumination of NIR light, the GO-based nanomaterials locally raised the temperature, resulting in high mortality of bacteria. The HAase-triggered AgNPs releasing approach for antibacterial allows AgNPs to be protected by hyaluronic acid (HA) template without affecting mammalian cells. The nanocomposites provided antibacterial activity against S. aureus while showing low toxicity to mammal cells. In addition, the GO–HA–AgNPs are prepared for in vivo experiments and show excellent antibacterial property in wound disinfection model.
研究领域:
纳米医学
·
抗菌材料
·
光热治疗
·
感染性疾病治疗
·
生物材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2015
·
IF 3.615
Wenrong Cao,Lifang Chen,Zhiwen Qi
Novel Ag/Ag 2 SO 4 /ZnO nanostructures were successfully fabricated by a facile microwave-assisted template-free hydrothermal method. The results reveal that Ag/Ag 2 SO 4 nanoparticles are uniformly dispersed on the surfaces of ZnO plates, which forms the hierarchical Ag/Ag 2 SO 4 /ZnO (AZ) nanostructures. The AZ-2 photocatalyst obtained by adjusting the amounts of thiourea and AgNO 3 with the molar ratio of 1:1 exhibits the highest photocatalytic efficiency, and rhodamine B can be decolorized within 35 min and 20 min under visible-light ( λ > 420 nm) and natural sunlight irradiation, respectively. The enhanced photocatalytic performance of AZ catalysts may result from the synergistic effects of Ag/Ag 2 SO 4 nanoparticles loaded on ZnO surfaces, which can enhance visible-light absorption capability of ZnO and promote photoinduced electron–hole separation. Therefore, the Ag/Ag 2 SO 4 nanoparticles doped on semiconductors can be used as effective visible-light photocatalysts and show a great potential for practical applications in the treatment of dye-containing wastewater.
研究领域:
材料科学
·
光催化
·
纳米技术
·
环境化学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Peibo Li,Jianian Hu,Tao Fang,Youlin Zhu,Yi Sun,Xiao Wang,Xuebin Yang,Qiang Shen,Guoqiang Luo
The objective of this study is to modulate the size of intermetallic compounds to increase the strength of Al–Ag composites. In this study, we prepared Al–Ag composites using plasma-activated sintering (PAS). The effect of the applied current on the nucleation barrier of the Al/Ag alloy phase was investigated. The strengthening mechanism of Ag-reinforced Al matrix composites was explored. We found that two alloy phases, Ag 2 Al and Ag 3 Al, were generated in the Al–Ag composites. The alloy phases distributed at the grain boundaries strengthened the Al–Ag composites by enhancing the dislocation density in the matrix and by impeding dislocation motion . The ultimate tensile strength and yield strength of the Al–7Ag composite increased by 60.1% and 166%, respectively, compared with those of pure Al. Moreover, we calculated the contribution of each strengthening mechanism to the overall yield strength. The applied current lowered the nucleation barrier of the alloy phase and facilitated the nucleation process.
研究领域:
材料科学
·
金属基复合材料
·
机械工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·6439-6455
·
IF 3.5
Liangliang Tang,Dongxu Yao,Yongfeng Xia,Jun Zhao,Ming Zhu,Yu-Ping Zeng
Complex liquid–solid reactions occur during brazing. A deep understanding of brazing liquid evolution is therefore of important concern for the bonding between filler and substrates. The joining of gas-pressure-sintered silicon nitride (Si 3 N 4 ) ceramic to oxygen-free copper (OFC) foil was prepared using Ag–Cu–TiH 2 filler at 875°C for 0.5 h. The effect of the Ag:Cu ratio on the interfacial microstructure and peeling strength of the joints was analyzed. The reaction of brazing liquid with Si 3 N 4 ceramic includes reactions with both the β-Si 3 N 4 and the grain boundary phases (Y–Si–Mg–O–N). The resulting interfacial reaction products include TiN, Ti 5 Si 3 , and potential Cu 3 Ti 3 O. Based on the phase composition and three-dimensional morphology of the interfacial reaction products in the Si 3 N 4 ceramic/OFC foil joints, a model for the evolution of the brazing liquid as the reaction proceeds was proposed. Peeling test results indicated that the peeling strength of the joints rises unilaterally with the increase of the Ag:Cu ratio in the filler until reaching the peak value of 24.3 N/mm at the maximum Ag:Cu ratio of 90:10. The mechanisms of the joint peeling fracture were discussed in detail.
研究领域:
材料科学
·
冶金学
·
陶瓷学
·
连接技术
·
表面工程
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2015
·
IF 3.569
Liang Zhang,Shuai Yuan,Shuo Chen,Dongrui Wang,Bao-Zhong Han,Zhi-Min Dang
Ag nanoparticles@polydopamine (AgNPs@PDA) core–shell particles were prepared by one-step oxidative–reductive reaction, which Ag + was used as oxidant and dopamine as reducing agent. The dopamine was polymerized to PDA surface and shielded the Ag nanoparticles . The AgNPs@PDA particles were used as fillers and introduced into poly(vinylidene difluoride) (PVDF) to prepare the AgNPs@PDA/PVDF dielectric composites. AgNPs were introduced aiming to increase the dielectric constant of the composites and PDA was employed to improve the compatibility between fillers and polymer. The morphology and the dielectric properties of the AgNPs@PDA/PVDF composite films were thoroughly investigated. The influencing factors to the dielectric performances of the composites were studied, including the ratio of AgNO 3 and dopamine, pH values of the preparing solution and the fraction of the fillers. The highest dielectric constant of the AgNPs@PDA/PVDF composites was about 53 when the content of fillers was 25 wt.% at 100 Hz. The percolation threshold of the composites was predicted at about 25.5 wt.%.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Jingyu Lu,Jinchao Fang,Jiaqi Li,Chenhe Wang,Zijie He,Liping Zhu,Zhikang Xu,Hongbo Zeng
In the present work, polydopamine nanotubes (PDA NTs) decorated with silver (Ag) nanoparticles (NPs) were successfully fabricated via a template induced self-polymerization of dopamine, followed by in situ reduction and immobilization of NPs from nitrate solution. The typical Ag@PDA NTs exhibits 39.1 wt % of Ag content and excellent catalytic activity as demonstrated by the reduction of a model organic pollutant, methylene blue, with an apparent rate constant of 3.19 min–1 in the first-order kinetics model, which is the highest value reported so far. The superior catalytic performance is attributed to the high Ag loading, uniform distribution of NPs, and excellent dispersity in water. Moreover, it is believed that the superhydrophilic hollow morphology of PDA NTs with ultrahigh porosity (81.4%) and open ends facilitates the contact of the catalysts with reactant molecules and mass transfer in aqueous reaction. The Ag@PDA NTs nanocatalysts could be easily recycled, and the catalytic efficiency remained nearly unchanged over 10 cycles. This synthetic strategy was proved to be applicable to other typical metal catalysts (e.g., Pt, Pd, Au). This work presents a universal approach to fabricate highly efficient nanocatalysts with PDA NTs as supports used for the reduction and degradation of organic dyes.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
WATER SCIENCE AND TECHNOLOGY
·
2015
·Vol. 71
·期 11
·1679-1685
·
IF 1.106
Hu Xuefeng,Wang Xiaowen,Dong Liuliu,Chang Fei,Luo Yongming
Ag speciation in a chloride medium was dependent upon the Cl/Ag ratio after releasing into surface water. In this study, the photoreaction of in situ formed Ag–Cl species and their effects on aniline photochlorination were systematically investigated. Our results suggested that formation of chloroaniline was strongly relevant to the Cl/Ag ratio and could be interpreted using the thermodynamically expected speciation of Ag in the presence of Cl − . AgCl was the main species responsible for the photochlorination of aniline. Both photoinduced hole and •OH drove the oxidation of Cl − to radical •Cl, which promoted the chlorination of aniline. Ag 0 formation was observed from the surface plasmon resonance absorption during AgCl photoreaction. This study revealed that Ag + released into Cl − -containing water may result in the formation of chlorinated intermediates of organic compounds under solar light irradiation.
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2026
·Vol. 98
·期 33
·24439-24447
·
IF 7.3
Wang Yaqi,Zhang Ying,Zhang Yan,Ma Xue,Zheng Ting,Xu Zhiming,Zhao Suoqi,Shi Quan,Chen Zhengyu,Xu Chunming,Zhang Linzhou
Mesophase pitch is a pivotal precursor
for advanced carbon
materials,
yet feedstock selection still relies on time-consuming thermal polycondensation
and ex situ microscopy. Here we report an Ag + -induced electrospray
ionization high-resolution mass spectrometry (ESI-HRMS) strategy for
rapid screening of mesophase-forming feedstocks in complex hydrocarbon
systems. The method exploits the structural sensitivity of Ag + -induced aromatic complexation, quantified through the response
of [2M + Ag] + multicomplex ions. Model compound studies
confirmed that Ag + preferentially complexes with high-aromaticity,
short-side-chain molecules, mirroring ideal mesophase precursor features.
Across FCC slurry oils, residual oil, and supercritical fluid extraction
fractions, the [2M + Ag] + signal correlates positively
with mesophase content and with the development of ordered mesophase
texture. Collision-induced dissociation (CID) analysis further indicates
that the dominant multicomplexes adopt an “aromatic-Ag + -aromatic” sandwich-like structure and are primarily
contributed by short-side-chain 3–5-ring aromatics.
✓ 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）