This thesis focuses on the controlled synthesis of Pt-Ni bimetallic nanoparticles and the study of their catalytic properties. It discusses in detail the nucleation mechanism and the growth process of bimetallic systems, which is vital for a deeper understanding of the design of bimetallic catalysts. The author presents four pioneering studies: (1) syntheses of water-soluble octahedral, truncated octahedral, and cubic Pt-Ni nanocrystals and the study of their structure-activity relationship in model hydrogenation reactions; (2) a strategy for designing a concave Pt-Ni alloy using controllable chemical etching; (3) defect-dominated shape recovery of nanocrystals, which is a new synthesis strategy for trimetallic catalysts; (4) a sophisticated construction of Au islands on Pt-Ni, which is an ideal trimetallic nanoframe catalyst. This thesis inspires researchers working in materials, catalysis as well as other interdisciplinary areas. 

Introduction.- Controllable Synthesis of Water-soluble Pt-Ni Alloys and the Study of their Catalytic Properties

The Study of a Strategy for Desigining a Concave Pt-Ni Alloy through Controlled Chemical Synthesis
The Discovery of Nano Defect Effects and the Design of Trimetallic Pt-Ni@M Core-shell Catalysts
The Synthesis Strategy of Au Modified Pt-Ni Trimetal Nanoframe Structure.