Beijing Advanced Innovation Center for Materials Genome Engineering;
University of Science and Technology Beijing;
Beijing 100083;
China;
Department of Physics;
University of Science and Technology Beijing;
Beijing 100083;
China;
Corrosion and Protection Center;
Key Laboratory for Environmental Fracture(MOE);
University of Science and Technology Beijing;
Beijing 100083;
China;
Core-shell structure; Density functional theory(DFT); Electronic structure; Optical properties; Redshift phenomenon;