Decal method for transferring platinum-and platinum alloy-based catalysts with nanonetwork structures

A decal method for transferring platinum- and platinum alloy-based catalysts with nanonetwork structures, comprising steps of:

• (a) spraying a polymeric thin film on a substrate;
• (b) growing platinum- and platinum alloy-based catalysts on said polymeric thin film by the steps of:
• (I) spraying a solvent mixture having a certain density of nanoparticles wherein said nanoparticles comprise a plurality of silicon dioxide particles on a surface of said polymeric thin film and hot-drying said solvent mixture to obtain a stacked arrangement of said nanoparticles of at least one layer of a face-centered cubic lattice nanonetwork structure on said polymeric thin film through a self-assembly function of said nanoparticles, wherein the solvent mixture is selected from a group consisting of a hydrous solvent mixture and an organic solvent mixture;
• (II) filling a metal ion solution into vacant spaces between said nanoparticles wherein the solution comprises a metal ion or a metal ion mixture or vacuum sputtering a catalyst metal element into vacant spaces between said nanoparticles, and
• (III) processing a hydrogasified reduction reaction and a first heat treatment to decompose said nanoparticles to obtain said platinum- and platinum alloy-based catalysts with nanonetwork structures on said polymeric thin film;
• (c) processing a second heat treatment to decompose said polymeric thin film to separate said substrate and said catalysts;
• and
• (d) spraying a binder on a surface of a proton exchange membrane support to bind said support with said catalysts so as to transfer said catalysts on said support through a hot-press treatment,
• wherein a hydrofluoric acid solution is added and wherein the second heat treatment is operated at a temperature lower than 100 Celsius degree (° C.).