Utilization of Perovskite-Type Oxynitride La0.5Sr0.5Ta0.5Ti0.5O2N as an O2-Evolving Photocatalyst in Z-Scheme Water Splitting

The particulate Z-scheme water splitting system involving a perovskite-type oxynitride as an O-2-evolving photocatalyst has been first demonstrated using La0.5Sr0.5Ta0.5Ti0.5O2N accompanied by Ru-loaded SrTiO3:Rh and [Co(bpy)(3)](3+/2+) (bpy = 2,2'-bipyridine) as a H-2-evolving photocatalyst and an electron mediator, respectively. O-2 evolution was negligible when the bare oxynitride was employed. A Pt cocatalyst deposited on La0.5Sr0.5Ta0.5Ti0.5O2N promoted the reduction of [Co(bpy)(3)](3+) due to capturing electrons, resulting in an enhancement of O-2 evolution. It has also been discovered that the Co(bpy)(3)] (3+/2+) electron mediator suppresses water formation over Pt particles.

Automated summary

The study demonstrates a particulate Z-scheme water splitting system utilizing a perovskite-type oxynitride as an O-2-evolving photocatalyst, with enhancements in O-2 evolution efficiency and the discovery of the electron mediator's suppression effect on water formation.