From the thermodynamics aspect, the driving force of atomic migration is generally described by this equation: ΔGmig = ΔHmig -TΔSmig + ΔγmigA (1) where ΔGmig, ΔHmig, ΔSmig, and Δγmig are the changes in Gibbs free energy, enthalpy, entropy, and specific surface energy before and after atomic migration, respectively. A is the surface area, and T is the absolute temperature. Site migration could happen when the ΔGmig is negative and is affected by many factors, such as the concentration-induced energy difference, atomic bonding strength (mainly related to ΔHmig), and surface energy (related to Δγmig) in structure features of nanocatalysts. The most well-known example is the Ostwald ripening, where large particles grow at the expense of small ones to reduce the overall surface energy. The driving force (related to Δγmig)