自適應(yīng)基因算法在表面界面問題的應(yīng)用
[Abstract]:In the first chapter, I briefly introduce the basic theory of the first principle calculation in the first part (1.1-1.4), with the emphasis on the density functional theory (DFT) based on the electron density. due to the reliability of the first principle calculation, the great improvement of the computing speed of the computer performance and the popularization and application of the parallel computer, the first principle theory is used for calculating, and the stable structure of the system is predicted from the chemical composition of the system, In the second part (1.5), a global optimization algorithm is presented, which focuses on the adaptive genetic algorithm developed by the Kai-MingHo group. In the second chapter, the geometry and electronic structure of TiO _ 2 and the band-edge high and low order of the valence band of the conduction band of different TiO _ 2 phases are briefly introduced. The three methods of photocatalytic hydrogen production, the electrocatalytic hydrogen production of photovoltaic, the hydrogen production of the photolysis water and the photoelectrocatalytic hydrogen production are discussed. The principle of photocatalytic reaction and three key factors to improve the efficiency of photocatalytic reaction are described: (1) light absorption efficiency, (2) photo-generated carrier lifetime, and (3) surface reaction activity. In the third chapter, we have studied the relation between the surface tension stress and the surface reaction activity, and explained the contradiction between the theoretical prediction and the experimental observation for a long time. In the past 20 years, the density functional theory has always predicted that the surface of the anatase phase (Anatase) TiO _ 2 (001) and its (1-4) reconstruction are highly active, thus inducing a large number of experimental work to synthesize a high proportion of the Anatase (001) surface, but the experimental results of the recent scanning tunneling microscope are exactly the same as that of the same. The experiment shows that this surface is very inert, in addition to the defect structure. In this chapter, we calculated the first principle of the system on the surface of the anatase phase TiO _ 2 (001)-(1X4). Our calculations show that the tensile stress of the surface plays a critical role in surface activity, and the previously theoretical predicted surface activity is derived from the intrinsic surface stress, while the surface stress is easily released by a defect or the like while inhibiting the high activity of the surface. Therefore, the synthesis of the surface of the anatase phase TiO _ 2 (001) with a small number of surface defects is of great importance to the improvement of its catalytic activity, and our results show that this can be achieved by the adsorption of water molecules. Our study not only explained the contradiction between the experimental observation and the theoretical prediction on the surface activity of the anatase phase TiO _ 2 (001), but also revealed the essence of the origin of the surface activity, and the conclusion can be extended to other oxide surfaces. In the fourth chapter, we have systematically studied the various defects in the surface of anatase TiO _ 2 (001)-(1-4). The presence of defects is critical to the surface activity of oxides, and therefore it is also important to understand the geometry of the defect and its electronic structure. The surface defects of the anatase TiO _ 2 (001)-(l X4) have high activity, however, due to the appearance of surface reconstruction, the defects in different experiments have complex characteristics, which makes it very challenging to determine the atomic structure of the defect. In this chapter, we used the adaptive genetic algorithm (AGA) and the density functional theory (DFT) to study the surface defects of TiO _ 2 (001)-(1X4). For different Ti-O ratios, we give an atomic structure with a lower energy defect, and study the electronic structure by using the hybrid functional method, and obtain the stable conditions of various defects in the real environment. We have successfully found different oxygen vacancies (Ov) and titanium interstitial (Tiimi) structures, which are distinct from the conventional defects in both the charge local level, the magnetic and scanning tunneling microscope's dark and dark characteristics. Our calculation results in a successful interpretation of the relevant experiments. In the fifth chapter, we study the structure of Pt transition metal nanoparticles on MoS2 monolayer. The synthesis of nano-particles containing a small amount of Pt metal atoms on different substrates is of great significance for designing a high-efficiency and low-cost catalyst. In ord to understand that mechanism of the behavior of the nucleation and epitaxial growth of the pt metal atom on the MoS2 monolayer. The atomic structure of Ptn (n55) metal nanoparticles is predicted by the adaptive genetic algorithm, and the growth behavior and the electronic structure of the structure are analyzed with the density functional theory. The magic number of the Pt metal particles on the MoS2 monolayer is given as 7,9 and 11. The structure we've got is almost single-layer, hexagonal, and the different layers are HCP stacks. When n20, all of the most stable structures are two layers, and for 34 or 38, the most stable structure is three layers. When n = 55, the most stable structure is four layers. Some of the predicted structures were verified in the experiments of scanning the transmission microscope. In the last chapter, a summary of the doctor's work and a look at the future work.
【學(xué)位授予單位】:中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:O485
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