Platinum-carbon composite comprising sponge-like platinum nanosheet supported on carbon and method for producing the same

摘要

A platinum-carbon composite of novel form carrying a platinum nanosheet that by application to catalysts, electrodes, etc. realizes nonconventional performance, action and effect. First, a reaction mixture consisting of either two types of nonionic surfactants or two types of surfactants composed of a mixture of one type of nonionic surfactant and one type of ionic surfactant, a platinum complex compound, water and carbon of varied type is prepared. Subsequently, an aqueous solution of reducing agent is added to the reaction mixture to thereby effect reaction. Thus, there is produced a platinum-carbon composite having a platinum nanosheet carried on carbon, which platinum nanosheet is in the form of a sheet consisting of mutually linked crystals or single crystals of 20 to 100 nm outer diameter whose skeletons are constituted of noble metal element platinum (Pt) and include three-dimensionally linked curved rodlike skeletons of 1.5 to 4 nm diameter, and which platinum nanosheet has a spongy configuration having network voids consisting of slitlike pores of 0.3 to 2 nm width. The produced platinum-carbon composite is recovered.