Functional Dye-doped Foams Treated with Supercritical Carbon Dioxid as an Efficiently Photoinduced Hydrogen Evolution

- Effect of Dispersing State of Platinum Catalyst -

Abstract

Skinless polymer foams were prepared by adjusting the foaming process with supercritical carbon dioxide (scCO2). Tin meso-tetraphenyl porphyrin (SnTPP) was doped in poly (methyl methacrylate) foams. Platinum catalyst could be supported on the foams by supercritical fluid technique : an organometallic complex (CODPtMe2) was impregnated into the film with scCO2 and it was then reduced to free Pt metal cluster near the surface. The foams impregnated with platinum cluster were applied to a solid support for the photoinduced hydrogen evolution. When platinum cluster was impregnated in the foams at higher than 100 the amount of hydrogen evolved from the foam increased comparing with foams treated with the other temperatures. Using the impregnated with platinum system, 93 uL of hydrogen was evolved, which was 1.4 times larger than that using the colloidal platinum system. The present results show that Pt-fixed polymer foam enhances the efficiency of photoinduced hydrogen evolution and their durability.