Preparation of hexagonal close-packed (2h) rhodium and rhodium alloy nanomaterials

Abstract

A compounds-derived method for synthesizing Rh and 2H Rh-based alloy nanomaterials is provided. The method includes preparing orthorhombic phase Rh2C NPLs; obtaining pure 2H Rh NPLs by extracting C atoms from the Rh2C NPLs; and obtaining 2H Rh-based alloy NPLs by simultaneously reducing the second metal during the C extraction. The preparing orthorhombic phase Rh2C NPLs includes dissolving Rh(acac)3 or RhCl3 into a mixture solution containing oleylamine and oleic acid in a container and sonicating for a predetermined time; adding formaldehyde into the mixture solution; sealing the container and sonicating it; heating the container; and cooling the container to room temperature. Obtaining pure 2H Rh NPLs by extracting C atoms from the Rh2C NPLs includes re-dispersing the Rh2C NPLs in oleylamine by sonication; and heating the solution in an oil bath, while simultaneously flowing Ar/H2 mixture into the solution. Obtaining 2H Rh-based alloy NPLs by simultaneously reducing the second metal during the C extraction includes re-dispersing the Rh2C NPLs and dissolving a second metal precursor in oleylamine by sonication; and heating the solution in an oil bath, while simultaneously flowing Ar/H2 mixture into the solution. The pure 2H Rh NPLs obtained remain stable after annealing treatment at 300° C. for one hour under an inert atmosphere.

Dependencies are inferred from the claim text.