Solar hydrogen production over novel metal sulfide photocatalysts of AGa_2In_3S_8 (A = Cu or Ag) with layered structures

摘要

Layered metal sulfides of CuGa_2In_3S_8 with a 1.91-eV band gap and AgGa_2In_3S_8 with a 2.27-eV band gap gave 15% apparent quantum yields at 560 nm and 460 nm for H_2 evolution from aqueous solutions containing K_2SO_3 and Na_2S as electron donors with assistance of Rh cocatalysts, respectively, and Rh/CuGa_2In_3S_8 responded to 680 nm for the photocatalytic H_2 evolution.rnVisible-light-driven photocatalysts have extensively been developed aiming at solar hydrogen production from water. Metal sulfide photocatalysts represented by ZnS and CdS show high activities for sacrificial H_2 evolution from aqueous solutions containing electron donors.