Metal-doped ceria nanoparticles: stability and redox processes

Area of Science:

• Materials Science
• Catalysis
• Computational Chemistry

Background:

• Doping oxide materials modifies their properties for various applications.
• Noble metals as dopants in oxides can create cost-efficient, atomically dispersed catalysts.
• The host oxide structure and dopant position dictate material stability and chemical behavior.

Purpose of the Study:

• To investigate the stability and redox properties of cerium dioxide nanoparticles doped with Pt, Pd, Ni, and Cu.
• To understand the influence of dopant position on the catalytic activity of doped ceria.
• To explore the role of under-coordinated surface sites in doped nanostructured oxides.

Main Methods:

• Density functional theory (DFT) calculations were employed.
• Analysis of relative stability of doped ceria nanoparticles.
• Evaluation of redox properties, including oxygen vacancy formation and H2 adsorption.

Main Results:

• Dopant atoms (Pt, Pd, Ni, Cu) exhibit highest stability at surface positions of ceria nanoparticles.
• The position of dopant atoms significantly impacts the energies of catalytic reduction reactions.
• Under-coordinated surface sites play a critical role in the characteristics of doped nanostructured oxides.

Conclusions:

• Surface doping is a key strategy for preparing effective catalysts based on doped ceria nanoparticles.
• The precise location of dopant atoms is crucial for tuning the catalytic performance of ceria-based materials.
• DFT calculations provide valuable insights into the structure-property relationships of doped nanostructured oxides.