修车大队一品楼qm论坛51一品茶楼论坛,栖凤楼品茶全国楼凤app软件 ,栖凤阁全国论坛入口,广州百花丛bhc论坛杭州百花坊妃子阁

oe1(光电查) - 科学论文

过滤筛选

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） ▾

  • Pt/TiO2 nanotube photocatalyst – Effect of synthesis methods on valance state of Pt and its influence on hydrogen production and dye degradation

    摘要： Direct conversion of solar energy into clean fuels is emerging as an efficient way for the future energy generation and solving environmental issues. Especially, photocatalytic splitting of water into H2 under solar light irradiation is one of the best techniques for clean energy production. Also, decomposition of organic pollutants using solar light is an urgent need to protect the environment. Hence, in the present study, we studied Pt-TiO2 nanotubes based composites for H2 generation and methyl orange dye degradation under solar light irradiation and compared the effect of deposition methods namely photo-deposition and chemical reduction methods. We have achieved the highest rate of H2 generation activity compared to other Pt-TiO2 based composite photocatalysts reported previously, and it is ≈ 173. mmol. h-1.g-1 cat for both photo-deposited and chemically reduced Pt/TiO2 nanotubes. This is about 46.8 folds higher than the pristine TiO2 nanotubes at the same experimental conditions. The selected catalysts were tested for degradation of methyl orange dye, where the catalyst prepared by chemical reduction method showed improved activity (94% degradation in 30 min) compared to the one which is prepared by photo-deposition method (50.5% degradation in 30 min). XPS analysis revealed that the photo-deposited catalyst consist only metallic Pt?, while the chemical-reduction yielded Pt with multiple oxidation states, Pt?, Pt2+ and Pt4+.

    关键词： dye degradation,photo-deposition,chemical reduction,Solar energy,hydrogen production,photocatalysis

    更新于2025-09-10 09:29:36

  • Preparation of amine functionalized g-C3N4@H/SMOF NCs with visible light photocatalytic characteristic for 4-nitrophenol degradation from aqueous solution

    摘要： At ambience temperature, a facile and large-scale sonochemical synthesis route was used to synthesize graphitic carbon nitride@[Ti4C24H39N3O29] metal-organic framework nanocomposites (g-C3N4-X@YTi-MIL125-NH2 NCs, where X and Y stood for the weight percentages of g?C3N4 and the synthesis method of Ti-MIL125-NH2, respectively) having 2-Amino-1,4-benzenedicarboxylic acid (2-ATA) ligand with amine functional free groups. The obtained NCs were characterized by FT-IR, PXRD, FE-SEM, BET, UV-DRS, PL, EIS, and zeta potential. Moreover, g-C3N4-X@YTi-MIL125-NH2 capability to eliminate 4-nitrophenol (4-NP) contaminant from water via visible light illumination was explored. Our synthesized NCs under a facile, green ultrasonic technique (i.e. g-C3N4-30@STi-MIL125-NH2) had a higher percentage of degradation than those from hydrothermal technique (i.e. g-C3N4-30@HTi-MIL125-NH2) with degradation percentages of 75% and 57%, respectively, which resulted in effective mass transfer and separation of photo?generated charge carriers. Additionally, this higher percentage of degradation could be attributed to the larger surface area and unique morphology of the ultrasonically synthesized particles with higher homogeneity and better and non-agglomerated distribution. Furthermore, excellent reusability and stability were observed for g-C3N4-30@STi-MIL125-NH2. We also explored the role of some scavengers in the degradation procedures to investigate the effect of active species. The experimental results were used to describe the suggested mechanism capability for improved photocatalysis.

    关键词： Sonochemistry,Photocatalytic degradation,4-Nitrophenol,Metal-organic Framework,g-C3N4@Ti-MIL125-NH2 NCs

    更新于2025-09-10 09:29:36

  • Rapid Visible Light Induced Photocatalytic Degradation of Orange-II Using H2O2 Sensitized Cu2O

    摘要： Photocatalytic degradation of orange II has been studied using H2O2 sensitized Cu2O and visible light. Complete degradation of orange II is achieved for 90 min of irradiation. Addition of external oxidant H2O2 is found to be enhancing the rate of degradation. Formation of ?OH free radicals during irradiation is ascertained with photoluminescence studies using terephthalic acid as probe molecule.

    关键词： Orange II,Photocatalytic degradation,Synergetic effect,Cu2O

    更新于2025-09-10 09:29:36

  • Small lanthanide-doped Sr2YbF7 nanocrystals: Upconversion fluorescence and upconversion-driven photodegradation

    摘要： A series of lanthanide-doped Sr2YbF7 nanocrystals were prepared conveniently via a solvothermal method using oleic acid as the stabilizing agent, which were about 15 nm of the average crystalline size at 200 °C and 24 h. Through screening the doped lanthanide ions and their concentrations, we found that the nanocrystals realized intense ultraviolet, visible and near-infrared upconversion emissions under 980 nm excitation. Based on the photo-physical property of the nanocrystals, we built the hybrid Sr2YbF7: Tm3+@TiO2 to successfully realize upconversion-driven photo-degradation of Rhodamine B, in which semiconducting TiO2 took advantage of the light emitted by Sr2YbF7: Tm3+ to produce the electron-hole pairs.

    关键词： Upconversion,Photo-degradation,Sr2YbF7 nanocrystals

    更新于2025-09-10 09:29:36

  • Synthesis of ZnO:TiO2 nanocomposites for photocatalyst application in visible light

    摘要： xZnO:(1-x)TiO2 (x=1.0, 0.6, 0.5, 0.4, 0.0) nanocomposites powder were synthesized by sol- gel method. The X-ray diffraction results have shown a mixed phase of titanium dioxide and zinc oxide. The average crystallite size was found in the range of 20 to 45 nm. The absorbance of ZnO:TiO2 nanocomposite powder was measured in the wavelength range from 350 to 800 nm and the optical bandgap was varied from 3.30 to 3.10 eV. The ZnO:TiO2 nanocomposites were investigated for their adaptability to degrade organic methyle blue dye under the influence of visible light. ZnO:TiO2 nanocomposite powder exhibit better absorption of visible light and generates more number of electron hole pairs. The photodegradation was increased from 75 to 90% with the varying of x from 1.0 to 0.4. For futher studies of the photocatalyst, biological oxygen demand and chemical oxygen demand were used for examining the consumption of oxygen in the dye with catalyst. The ZnO:TiO2 nanocomposites powder shows a better adaptability in photocatalytic applications under visible light as compared to other metal oxide nanocomposites.

    关键词： Chemical oxygen demand,Biological oxygen demand,Nanocomposites,Photo degradation

    更新于2025-09-10 09:29:36

  • Preparation and Photocatalytic Performance of Bamboo-Charcoal-Supported Nano-ZnO Composites

    摘要： Nano-ZnO/bamboo charcoal composites were prepared by precipitation with bamboo charcoal as support. Nano-ZnO/bamboo charcoal composites were characterized by XRD, SEM and EDS. Photocatalytic degradation processes of methyl orange were studied. The results indicate that the structure of nano-ZnO is of the wurtzite type and the grain size is about 19 – 54 nm. The best preparation temperature for these composites is 500 ℃. The composites have better photocatalytic degradation ability than pure ZnO under UV irradiation. Photocatalytic degradation of methyl orange with the composites obeys first-order kinetics, and the composites can be recycled.

    关键词： methyl orange,precipitation,photocatalytic degradation,charcoal,Nano-ZnO

    更新于2025-09-10 09:29:36

  • Light Metals 2016 (TMS/Light) || SiC in Electrolysis Pots: An Update

    摘要： This update reviews recent results of physical and chemical testing of Si3N4-bonded SiC sidelining material for aluminium electrolysis pots, as well as the corrosion mechanisms of SiC materials under electrolysis conditions. New test methods have been developed to show how these materials perform in a harsh operating environment. The attack by low temperature bath was tested on SiC bricks, also with SiAlON and N-SiC as binder phase. Reverse reactive sintering has become an important manufacturing process for Si3N4-bonded SiC sidelining material This review updates [1, 2].

    关键词： SiC corrosion resistance,SiC manufacture,SiC degradation

    更新于2025-09-10 09:29:36

  • Recent development of g-C3N4-based hydrogels as photocatalysts: A minireview

    摘要： Solar-driven photocatalysis using graphitic carbon nitride (g-C3N4) is considered the most promising approach for the generation of H2 from water, degradation of organic pollutants, and reduction of CO2. However, bulk g-C3N4 exhibits several drawbacks, such as low specific surface area, high defect density, and fast charge recombination, which result in low photocatalytic performance. Construction of 3D porous hydrogels for g-C3N4 through nanostructural engineering is a rapid, feasible, and cost-effective technique to improve the adsorption capability, stability, and separability of the hydrogel composite; to increase the number of active sites; and to create an internal conductive path for facile charge transfer and high photocatalytic activity. This minireview summarizes the recent progresses in photocatalytic water splitting and dye degradation using g-C3N4-based hydrogels with respect to the state-of-the-art methods of synthesis, preparation, modification, and multicomponent coupling. Furthermore, comprehensive outlooks, future challenges, and concluding remarks regarding using g-C3N4-based hydrogels as highly efficient photocatalysts are presented.

    关键词： water splitting,hydrogels,photocatalysts,dye degradation,g-C3N4

    更新于2025-09-10 09:29:36

  • Effects of Pt-loading on Formation and Visible Light-Induced Photocatalytic Activity of Bismuth Titanate

    摘要： Pt/TiO2-Bi2O3 test catalysts were prepared by impregnating Pt on the sol-gel derived TiO2-Bi2O3 to give these testpieces high photocatalytic activity under visible light irradiation. The optimum Pt support content and TiO2 content were observed in the ranges 0.05-0.3 wt% and 17-28 wt%, respectively in the photocatalytic activity for Methylene Blue (MB) degradation on Pt/TiO2-Bi2O3. Specifically, those 0.1Pt/17TiO2-83Bi2O3, 0.2Pt/23TiO2-77Bi2O3 and 0.3Pt/28TiO2-72Bi2O3 samples showed relatively higher photocatalytic activity for the MB degradation. The results were closely related to (1) the restriction of recombination of the photo-induced electron and hole pairs by Pt, and (2) the presence of bismuth titanate with such high Ti content as built up by Pt.

    关键词： Bismuth titanate,Pt-loading,Methylene Blue degradation,Photocatalytic activity,Nucleating agent

    更新于2025-09-10 09:29:36

  • [IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - An impact of thermal electron energy on the field-electron emission from nanosized silicon tips

    摘要： Thermal effects associated with the thermal energy of electrons play an important role in the process of field emission. To estimate the contribution of these effects, a self-consistent numerical calculation of the temperature of the semiconductor emitter, heated by the field-emission current, was carried out. It was experimentally obtained that the melting of the silicon field emitter occurs at currents less than 1 μA, for which the calculated temperature of the silicon tip varies only up to 420 K and does not exceed the melting point of Si. For this reason, we suppose that this effect can be caused by the sputtering of the anode material by hot field-emitted electrons that collect a high power density (~300 W/cm2 at 1 μA) on the anode surface. It also can lead to the possible generation of self-sustained plasma in the space gap between anode and cathode. The considered thermal phenomena should be taken into account during the development and predictive modelling of vacuum nanoelectronic devices.

    关键词： vacuum nanoelectronics,field-electron emission,emission current,nanoscale emitter,thermal degradation,thermal effects

    更新于2025-09-10 09:29:36