Fig. 1: Schematic illustration of free-energy diagram two types of Ir single atom on oxide support.

Orange: Precious metal atoms (e.g., Ir). Blue: Metal atoms of support (e.g., Fe, Co, Ni, Mn); Red: Lattice oxygen atoms.
Orange: Precious metal atoms (e.g., Ir). Blue: Metal atoms of support (e.g., Fe, Co, Ni, Mn); Red: Lattice oxygen atoms.