Z-Schematic Solar Water Splitting Using Fine Particles of H2-Evolving (CuGa)0.5ZnS2Photocatalyst Prepared by a Flux Method with Chloride Salts

Shunya Yoshino, Akihide Iwase, Yun Hau Ng, Rose Amal, Akihiko Kudo

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We successfully improved a (CuGa)0.5ZnS2 metal sulfide photocatalyst by preparation in a molten LiCl-CsCl flux for sacrificial H2 evolution compared to the counterpart prepared by a solid-state reaction. The particle size of the metal sulfide was controlled by changing the synthetic temperature of the flux method. The particle size of (CuGa)0.5ZnS2 as the H2-evolving photocatalyst drastically affected the Z-schematic water splitting activity driven by interparticle electron transfer with RGO-(CoOx/BiVO4) as an O2-evolving photocatalyst. When the (CuGa)0.5ZnS2 photocatalyst with a small particle size was used, the Z-schematic water splitting was enhanced by an increase in the collision frequency between Pt/(CuGa)0.5ZnS2 and RGO-(CoOx/BiVO4) particles for accelerating the interparticle electron transfer. This Z-scheme photocatalyst system gave an apparent quantum yield (AQY) of 0.80% at 440 nm and a solar-to-hydrogen conversion efficiency (STH) of 0.024% for water splitting into H2 and O2.

Original languageEnglish
Pages (from-to)5684-5692
Number of pages9
JournalACS Applied Energy Materials
Issue number6
Publication statusPublished - 22 Jun 2020


  • Z-scheme system
  • energy conversion
  • flux
  • metal sulfide
  • water splitting

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