Solar hydrogen production over novel metal sulfide photocatalysts of AGa2In3S8 (A = Cu or Ag) with layered structures

Abstract

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 H₂ 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 H₂ evolution.