Promoted Platinum Catalytic Activity and Thermal Stability with Nano-scale Cobalt Oxide Coating via Atomic Layer Deposition

摘要

Ultra-thin cobalt oxide has been deposited on the Pt nanoparticles to enhance the metal nanoparticles thermal stability. The thickness of protective Co_3O_4 coating layer can be accurately controlled around 1nm via atomic layer deposition. The Pt catalytic activity towards CO oxidation has been investigated in a micro flow reactor. In contrast to the aluminum oxide coating, the cobalt oxide coated Pt nanoparticles has demonstrated lower conversion temperature than bare Pt nanoparticles. Moreover the coated Pt nanoparticles show good sintering resistance up to 700°C under atmosphere condition.