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oe1(光电查) - 科学论文

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出版时间
  • 2019
研究主题
  • charge – discharge energy efficiency
  • Lithium-ion battery
  • degradation diagnosis
  • photovoltaic surplus energy
  • working electric vehicle
应用领域
  • Electrical Engineering and Automation
机构单位
  • Ritsumeikan University
493 条数据
?? 中文（中国） ▾

  • Photocatalytic Degradation of Aniline Using Supported TiO2/Charcoal Composite

    摘要： TiO2/bamboo charcoal composites were prepared by sol-gel technique with tetrabutyl titanate as the titanium source and 60-mesh bamboo charcoal as the support. The photocatalytic degradation processes of aniline were studied. The results indicated that the TiO2/bamboo charcoal composites had quite a good photocatalytic ability. In the UV irradiation, the temperature and pH value had great influence on the effect of degradation. When the pH value was between 1 to 3 and the temperature was 50 oC, the degradation effects reached more than 93 %. The degradation rate of aniline decreased when the concentration increased but increased with more TiO2 in it. The degradation achieved balance after 105 min. The photocatalytic degradation of aniline to TiO2 fitted in with the first reaction kinetic equation.

    关键词： Aniline,Titania,Bamboo charcoal,Photocatalytic degradation

    更新于2025-09-04 15:30:14

  • Co <sub/>3</sub> O <sub/>4</sub> nanoparticles decorated Ag <sub/>3</sub> PO <sub/>4</sub> as heterostructure for improving solar-light-driven photocatalysis

    摘要： As a common photocatalytic material, Ag3PO4 still faces the challenge including the fast recombination of photo-generated electron-hole (e--h+) pairs. In this work, we prepared Co3O4/Ag3PO4 heterojunction with good optical properties by an in-situ precipitation method. Compared to pure Ag3PO4, the Co3O4/Ag3PO4 exhibited greatly improved photocatalytic activities for degradation methylene blue (MB) and bisphenol A (BPA) under the visible light irradiation. Here, the degradation rate of MB could reach up to 12% which is about 35% higher than that of pure Ag3PO4, after 18 min irradiation. The degradation rate of BPA could reach up to 33% which is about 45% higher than the pure Ag3PO4. This work may provide insight for finding a new Ag3PO4 photocatalyst for promoting the photocatalytic performance

    关键词： solar-light-driven,degradation,heterostructure,Co3O4/Ag3PO4,photocatalysis

    更新于2025-09-04 15:30:14

  • Infrared Absorption Imaging of Water Ingress Into the Encapsulation of (Opto-)Electronic Devices

    摘要： Water ingress into the encapsulation of electronic devices is a serious issue, especially for organic and perovskite-based electronics. In order to guide the development of suitable barrier materials and design, a reliable, fast, and non-destructive analysis tool is required. In this work, an imaging setup is presented, which is based on selective infrared (IR) radiation sources and a mid- IR sensitive camera that uses the absorption band of water around 1920 nm and a reference band. This system enables us to monitor the distribution of water concentration inside the packaging of devices and its change over time. Our measurement is capable of detecting the local presence of water down to the mg/m2 concentration range in a wide variety of encapsulation materials. The new tool allows identifying the pathways of moisture ingress into the encapsulation along with the corresponding diffusion coef?cient. Thus, it provides fast and reliable analysis of humidity related failure mechanisms, and consequently helps to improve the design of encapsulation materials and processes.

    关键词： optical signal detection,Degradation,organic photovoltaics (PVs),packaging,diffusion processes

    更新于2025-09-04 15:30:14

  • In situ TEM Study of the Degradation of PbSe Nanocrystals in Air

    摘要： PbSe nanocrystals have attracted widespread attention due to a variety of potential applications. However, the practical utility of these nanocrystals has been hindered by their poor air stability, which induces undesired changes in the optical and electronic properties. An understanding of the degradation of PbSe nanocrystals when they are exposed to air is critical for improving the stability and enhancing their applications. Here, we use in situ transmission electron microscopy (TEM) with an environmental cell connected to air to study PbSe nanocrystal degradation triggered by air exposure. We have also conducted a series of complementary studies, including in situ environmental TEM study of PbSe nanocrystals exposed to pure oxygen, PbSe nanocrystals in H2O using a liquid cell, ex situ experiments, such as O2 plasma treatment and thermal heating of PbSe nanocrystals under different air exposure. Our in situ observations reveal that when PbSe nanocrystals are exposed to air (or oxygen) under electron beam irradiation, they experience a series of changes, including shape evolution of individual nanocrystals with the cuboid intermediates, coalescence between nanocrystals, and formation of PbSe thin films through drastic solid‐state fusion. Further studies show that the PbSe thin films transform into an amorphous Pb rich phase or eventually pure Pb, which suggest that Se reacts with oxygen and can be evaporated under electron beam illumination. These various in situ and ex situ experimental results indicate that PbSe nanocrystal degradation in air is initiated by the dissociation and removal of ligands from the PbSe nanocrystal surface.

    关键词： in situ TEM,air stability,ligand removal,degradation,PbSe nanocrystals,oxygen exposure

    更新于2025-09-04 15:30:14

  • Enhanced Photoresponsive Graphene oxide-modified g-C3N4 for Disassembly of Amyloid β Fibrils

    摘要： Protein misfolding and abnormal self-assembly lead to the aggregates of oligomer, fibrils, or senior amyloid β plaques, which is associated with the pathogenesis of many neurodegenerative diseases. Progressive cerebral accumulation of amyloid β-protein (Aβ) was widely proposed to explain the cause of Alzheimer's disease, for which one promising direction of preclinical study is to convert the pre-formed β-sheet structure of amyloid β aggregates into innocent structures. However, the conversion is even harder than the modulation of amyloidosis process. Herein, graphene oxide/carbon nitride (GO/g-C3N4) composite was developed as a good photocatalyst for irreversibly disassembling the amyloid β aggregates of Aβ (33-42) under UV. Quartz crystal microbalance, circular dichroism spectrum, atomic force microscopy, fluorescent spectra, and mechanical property analysis were performed to analyze this photo-degradation process from different aspects for fully understanding the mechanism, which may provide an important enlightenment for the relevant research in this field and neurodegenerative disease study.

    关键词： Neurodegenerative disease,Amyloid β disassembly,Quartz crystal microbalance,Atomic force microscopy,Photo-degradation

    更新于2025-09-04 15:30:14

  • Facile synthesis of Ag/ZnO metal–semiconductor hierarchical photocatalyst nanostructures <i>via</i> the galvanic-potential-enhanced hydrothermal method

    摘要： Hierarchical metal–semiconductor nanostructures (NSs) composed of a backbone made of Ag nanowire and ZnO nanorod (NR) branches were successfully prepared using the galvanic-potential-enhanced hydrothermal method. A galvanic cell structure was formed between an Al bottle anode that was used as a hydrothermal reactor and an Ag NW cathode dispersed in a hydrothermal solution. As a result, the contact-potential-driven hydrothermal growth of the ZnO NRs on the sidewalls of the Ag NWs could be achieved. The morphological and microstructure characterization confirmed the formation of well-arranged hierarchical NSs composed of Ag NW trunk and ZnO NR branch structures. The photocatalytic properties of the hierarchical Ag/ZnO NSs were investigated by degrading methylene blue (MB) dye as a model pollutant. It was found that the hierarchical Ag/ZnO NSs demonstrated a more than two-fold faster degradation rate than the pristine ZnO NSs. The high-performance photocatalytic activity of the Ag/ZnO hierarchical NSs was attributed to the synergetic effect of the metallic Ag NWs and the ZnO NRs that enhanced the charge separation and diffusion by suppressing charge recombination, as well as enhanced reaction sites and light absorption.

    关键词： methylene blue degradation,Ag/ZnO,photocatalytic activity,hierarchical nanostructures,galvanic-potential-enhanced hydrothermal method

    更新于2025-09-04 15:30:14

  • Bi <sub/>5</sub> O <sub/>7</sub> NO <sub/>3</sub> and Ag/Bi <sub/>5</sub> O <sub/>7</sub> NO <sub/>3</sub> composites: one-step solution combustion synthesis, characterization and photocatalytic properties

    摘要： In the present study, Bi5O7NO3 and Ag/Bi5O7NO3 composites, as novel efficient photocatalysts, were synthesized via a one-step solution combustion synthesis (SCS) using bismuth nitrate (Bi(NO3)3·5H2O) as an oxidant, tartaric acid (C4H6O6) as a fuel, and silver nitrate (AgNO3) as an Ag source. The amount of Ag in the composite was tailored by varying the AgNO3 content during the SCS process. The orthorhombic Bi5O7NO3 crystal structure was confirmed by XRD, FT-IR and XPS. It was found by EDS and TEM that in the Ag-containing composite, Ag was uniformly distributed on the Bi5O7NO3 matrix. The Ag decoration improved the Bi5O7NO3 photocatalytic efficiency for methyl orange (MO) degradation, likely owing to the relatively low recombination rates of electrons and holes. The 5 mol% Ag/Bi5O7NO3 composite exhibited the best photocatalytic performance (95% in 60 min), which was 1.5 times higher compared to that of pure Bi5O7NO3. In addition, a mechanism of the photocatalytic MO degradation reaction was proposed, which the reactive species O2? played an important role in degrading pollutants.

    关键词： Bi5O7NO3,methyl orange degradation,Ag/Bi5O7NO3 composites,solution combustion synthesis,photocatalytic properties

    更新于2025-09-04 15:30:14

  • Effect of doping Fe/Cu/Ti on WO <sub/>3</sub> on furfural degradation

    摘要： This research improved tungsten oxide catalysts to increase efficiency in photocatalytic degradation of furfural under visible light. The aim of this research was to compare the efficiency of modified tungsten oxide with undoped and commercial tungsten oxide. Tungsten oxide nanoparticles were doped with 3 single metals, which were Fe/Cu/Ti at 1%wt, 2%wt, and 3%wt, synthesized by flame spray pyrolysis technique (FSP) and then characterization by X-Ray Diffraction (XRD), N2 adsorption/desorption (BET surface area analysis), UV-Vis Spectroscopy (UV-Vis). Photocatalytic degradation experiments using doped WO3 were carried out with 5 ppm initial concentration of furfural solution using 0.6 M catalyst concentration under visible light. From the results, FSP-synthesized WO3 has better efficiency in furfural degradation than the commercial WO3. All catalysts have mesoporous structure because an average pore size is in the range of 6-10 nm. Among all synthesized and doped WO3, it can be concluded that 3%wt Fe-doped tungsten oxide provides the highest acceleration rate in photocatalytic degradation of furfural.

    关键词： furfural,photocatalytic degradation,flame spray pyrolysis,tungsten oxide,doping

    更新于2025-09-04 15:30:14

  • Fabrication of Ag@AgCl with Enhanced Plasmonic Photocatalysis Performance via a Deep Eutectic Solvent

    摘要： The plasmonic photocatalyst Ag@AgCl was successfully prepared through a facile solvothermal method via a deep eutectic solvent (DES), which is composed of choline chloride and urea. X-Ray diffraction, scanning electron microscopy, energy-dispersive X-ray, element-mapping, X-ray photoelectron spectroscopy, N2 absorption–desorption, and UV-vis diffuse reflectance techniques were adopted to analyse the performance of the plasmonic photocatalyst. Characterisation results indicated that the DES not only served as a solvent and Cl source, but also as a reductant. Meanwhile, the probable mechanism for the formation of Ag@AgCl is discussed, which revealed a visible light enhanced photocatalytic property for the degradation of benzidine. Furthermore, the photocatalyst showed no decrease in its catalytic activity even after five cycles of operation. Finally, a possible photocatalytic oxidation mechanism of Ag@AgCl is proposed.

    关键词： solvothermal method,photocatalytic degradation,plasmonic photocatalyst,Ag@AgCl,deep eutectic solvent

    更新于2025-09-04 15:30:14

  • [IEEE 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) - Waikoloa Village, HI, USA (2018.6.10-2018.6.15)] 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) - Testing of an Anti-Soiling Coating for PV Module Cover Glass

    摘要： Soiling of solar module cover glass can significantly reduce the module power output. Coatings can be applied to the cover glass surface to reduce adhesion and make the surfaces easier to clean. These coatings should be resilient and resistant to environmental damage. A hydrophobic anti-soiling coating was exposed to a variety of environmental and abrasion stress tests. The hydrophobic performance of the coating was measured by monitoring the water contact angle and the water roll off angle after exposure to a range of environmental and mechanical stress tests. The coating was shown to be highly resistant to damp heat and thermal cycling. However, it was degraded by UV exposure and damaged during abrasion tests. The coating was also exposed to outdoor testing to compare the laboratory results with real performance degradation.

    关键词： coating degradation,water contact angle,anti-soiling coating,hydrophobic coating

    更新于2025-09-04 15:30:14