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341 results on '"Wu, Qingyin"'

56. Preparation and photochromism performance of P2W16Mo2/PVA/TiO2 composite films.

Author

Wang, Zijing, Ai, Limei, and Wu, Qingyin

Subjects
PHOTOCHROMISM, ABSORPTION spectra, BLUE light, TITANIUM dioxide, NANOPARTICLES, TUNGSTEN alloys, MOLYBDENUM
Abstract

P2W16Mo2/PVA/TiO2 composite films were prepared by doping TiO2 nanoparticles (P25) into P2W16Mo2/PVA. Irradiated with UV light, composite films changed from light yellow to blue. P2W16Mo2/PVA and P2W16Mo2/PVA/TiO2 composite films (before and after UV irradiation) were characterized by IR spectroscopy, which verified that the basic structure of H6P2W16Mo2O62 and PVA were not destroyed in the composite films. The photochromism performance of P2W16Mo2/PVA and P2W16Mo2/PVA/TiO2 composite films were explored by UV–vis absorption spectra. Compared with P2W16Mo2/PVA composite films, photochromism response time of composite films doped in TiO2 was more sensitive and the UV–vis adsorption spectra absorbance increased significantly. With time, P2W16Mo2/PVA/TiO2 composite films had a circulation ability of rising-fading color. The composition of the composite film with the best photochromism performance was obtained. [ABSTRACT FROM AUTHOR]

Published
2020
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72. Nanoscale ZnS/TiO2 composites: Preparation, characterization, and visible-light photocatalytic activity

Author

Guo Yihang, Jiang Shicheng, Wu Qingyin, and Yu Xiaodan

Subjects
Anatase, Nanostructure, Photoluminescence, Nanocomposite, Materials science, Diffuse reflectance infrared fourier transform, Mechanical Engineering, Condensed Matter Physics, Mechanics of Materials, Transmission electron microscopy, Photocatalysis, General Materials Science, Composite material, Spectroscopy
Abstract

Photoactive ZnS/TiO{sub 2} nanocomposites were prepared via microemulsion-mediated solvothermal method. The structure, composition, physicochemical property, and morphology of the composites were characterized by powder X-ray diffraction (XRD), Raman scattering studies, UV diffuse reflectance spectroscopy (UV/DRS), photoluminescence (PL) spectroscopy, and transmission electron microscopy (TEM). It showed that the composites were cube-shaped with particle sizes of 10 to 15 nm, and the phase structure for ZnS and TiO{sub 2} in the composites was cubic and anatase, respectively. The content of the ZnS in the composites was 2.1%, 10.7%, and 19.9%, respectively. Compared with the solitary anatase TiO{sub 2}, the ZnS/TiO{sub 2} exhibited enhanced visible-light photocatalytic activity for the aqueous parathion-methyl degradation. Factors including the interactions between the phases of ZnS and TiO{sub 2}, strong adsorption of the substrate at the surface of the ZnS/TiO{sub 2} nanocomposites, and preassociation of the substrate and composites are responsible for this enhancement photocatalytic activity.

Published
2006

73. Polyoxometalate‐Derived Hexagonal Molybdenum Nitrides (MXenes) Supported by Boron, Nitrogen Codoped Carbon Nanotubes for Efficient Electrochemical Hydrogen Evolution from Seawater.

Author

Miao, Jun, Lang, Zhongling, Zhang, Xinyu, Kong, Weiguang, Peng, Ouwen, Yang, Ye, Wang, Shuangpeng, Cheng, Jiaji, He, Tingchao, Amini, Abbas, Wu, Qingyin, Zheng, Zhiping, Tang, Zikang, and Cheng, Chun

Abstract

MXenes and doped carbon nanotubes (CNTs) have entered into research arenas for high‐rate energy storage and conversion. Herein, a method of postsynthesis of MXenes in boron, nitrogen codoped CNTs (BNCNTs) is reported with their electrocatalytical hydrogen evolution performance. The encapsulation of hexagonal molybdenum nitrate nanoparticles (h‐MoN NPs) into BNCNTs protects h‐MoN NPs from agglomeration and poisoning in the complex environment. In principle, the synergism of B and N dopants on the doped CNTs and confined h‐MoN NPs produces extremely active sites for electrochemical hydrogen evolution. Density functional theory calculations reveal that the active sites for hydrogen evolution originate from the synergistic effect of h‐MoN(001)/CN (graphitic N doping) and h‐MoN(001)/BNC. The h‐MoN@BNCNT electrocatalyst exhibits a small overpotential of 78 mV at 10 mA cm−2 and Tafel slope of 46 mV per decade, which are dramatically improved over all reported MoN‐based materials and doped CNTs. Additionally, it also exhibits outstanding electrochemical stability in environments with various pH values and seawater media from South China Sea.Nanoflakes of hexagonal molybdenum nitrate are synthesized in the matrix of boron, nitrogen codoped carbon nanotubes with efficient electrocatalytic hydrogen evolution performance in acidic, neutral, and alkaline solutions. Electrolysis of seawater can also be operated by using as‐obtained catalysts because doped carbon nanotubes can protect hexagonal molybdenum nitrate from agglomeration and poisoning in the complex environment. [ABSTRACT FROM AUTHOR]

Published
2019
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