Improvement of photocatalytic activity of metal sulfide by organic dye for H2 formation from water

Photocatalytic activity of Pt-loaded metal sulfide with organic dye for the H-2 production from aqueous solution containing Na2S-K2SO3 as a sacrificial reagent was investigated. Hydrogen formation rate was improved by the dye-adsorption onto SnS photocatalyst by using Cr-tetraphenylporphyrin (Cr-TPP). SnS loaded with Pt exhibits H-2 formation up to 800 nm when Na2S and K2SO3 is used as sacrificial reagent, and it was found that the H-2 formation rate is much improved by the adsorption of Cr-TPP. In particular, the dye-adsorption effect was significantly appeared in the wavelength range less than 500 nm, which is in good agreement with the Soret band absorption of Cr-TPP.