Solar hydrogen production over novel metal sulfide photocatalysts of AGa(2)In(3)S(8) (A = Cu or Ag) with layered structures

Layered metal sulfides of CuGa2In3S8 with a 1.91-eV band gap and AgGa2In3S8 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 K2SO3 and Na2S as electron donors with assistance of Rh cocatalysts, respectively, and Rh/CuGa2In3S8 responded to 680 nm for the photocatalytic H-2 evolution.