Huang Chuyun
Hubei University of Technology
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Publication
Featured researches published by Huang Chuyun.
Journal of Semiconductors | 2014
Xu Wenhui; Ma Xinguo; Wu Tong; He Zhiqi; Wang Huihu; Huang Chuyun
An effective compensated codoping approach is described to modify the photoelectrochemical properties of anatase TiO2 by doping with nonmetals (N or C) and transition metals (V or Cr) impurities. Here, compensated codoped TiO2 systems are constructed with different dopant species and sources, and then their dopant formation energies and electronic structures are performed to study the stability and visible-light photoactivity by first-principles plane-wave ultrasoft pseudopotential calculations, respectively. The calculated results demonstrate that the codoping with transition metals facilitates the enhancement of the concentration of p-type dopants (N and C) in a host lattice. Especially, compensated codoping not only reduces the energy gap, to enhance the optical absorption, and eliminate the local trapping, to improve carrier mobility and conversion efficiency, but it also keeps the oxidation-reduction potential of the conduction band edge. These results are conducive to the understanding of the synergistic mechanism of the photocatalytic activity of TiO2 that is enhanced by codoping.
Journal of Semiconductors | 2016
Ma Xinguo; Yan Jie; Liu Na; Zhu Lin; Wang Bei; Huang Chuyun; Lü Hui
The effect of relaxation on the energetics and electronic structure of clean Ag3PO4(111) surface has been studied, carried out using first-principles density functional theory (DFT) incorporating the GGA+U formalism. After atomic relaxation of the Ag3PO4(111) surface, it is found that O atoms are exposed to the outermost surface, due to an inward displacement of more than 0.06 nm for the two threefold-coordinated Ag atoms and an outward displacement of about 0.004 nm for three O atoms in the sublayer. The atomic relaxations result in a large transfer of surface charges from the outermost layer to the inner layer, and the surface bonds have a rehybridization, which makes the covalence increase and thus causes the surface bonds to shorten. The calculated energy band structures and density of states of the Ag3PO4(111) surface present that the atomic relaxation narrows the valence band width 0.15 eV and increases the band gap width 0.26 eV. Meantime, the two surface peaks for the unrelaxed structure disappear at the top of the valence band and the bottom of the conduction band after the relaxed structure, which induces the transformation from a metallic to a semi-conducting characteristic.
Journal of Physics: Conference Series | 2011
Yao Yucheng; Huang Chuyun; Xu Guowang; Yan Xudong; Wang Yanlin
The micro-explosion during Ho:YAG laser lithotripsy may cause calculus fragmentation and migration. It plays an important role to the surgery. A numerical simulation of the micro-explosion during Ho:YAG laser lithotripsy has been developed. The explosion problem in water environment was solved by the Euler algorithm and the piecewise parabolic method (PPM) was selected in the calculation. This simulation investigated the explosion dynamics evolution in the lithotripsy area. The pressure and intensity of the calculus surface were calculated for different laser pulse energy and different distance between calculus and fiber tip. The calculation results indicate that the micro-explosions properties are determined by the pulse energy, pulse duration and the water distance. Though Short pulse duration and large pulse energy cause high ablation efficiency, it mains more calculus retropulsion at the same time. The ideal surgery results need property laser parameters.
Archive | 2013
Yao Yucheng; Zhang Ronghua; Huang Chuyun; Chen Benyuan
Archive | 2015
Lyu Hui; Sheng Fei; Liu Wen; Zheng You; Xu Shaogang; Zeng Huogen; Huang Chuyun; Guan Chenggang
Archive | 2015
Yao Yucheng; Huang Chuyun; Liu Hui; Xu Guowang
Archive | 2015
Ma Xinguo; Yan Jie; Liu Xingbo; Bie Yi Nan; Huang Chuyun; Xu Guowang; Lyu Hui
RSC Advances (Web) | 2017
Chen Yuxuan; Ma Xinguo; Li Di; Wang Huihu; Huang Chuyun
Archive | 2017
Yao Yucheng; Luo Caizhi; Liu Danlin; Huang Chuyun; Chen Benyuan
无机材料学报 | 2016
Ma Xinguo; Yan Jie; Chen Zi-Meng; Zhu Lin; Xu Guowang; Huang Chuyun; Lyu Hui