Patent ID: 7572542

Claim:
A ruthenium oxide encapsulating nano-carbon composite structure, produced by a method comprising the steps of: preparing a dispersed solution by highly dispersing in water a hollow nano-carbon having a hollow structure with a porosity of no less than 30% by volume, by centrifugal processing; preparing a precursor by adding a ruthenium chloride aqueous solution and adsorbing ruthenium chloride nano-particles onto the inner and outer surface of the hollow nano-carbon; and forming ruthenium oxide nano-particles from the ruthenium chloride nano-particles by ultra centrifugal processing of a solution comprising the precursor, and a surface sol-gel reaction, wherein the resulting ruthenium oxide nano-particles are highly dispersed as nanodots, inside and outside of hollow nano-carbon graphene layers having a porosity of no less than 30% by volume and the nano-particle size of ruthenium oxide is in the range of 0.5 to 2 nm.