[24p-P03-1~9] 13.9 Compound solar cells

[24p-P03-7] Synthesis of a highly efficient SrTiO₃ photocatalyst for overall water splitting: effects of doping of rare earth metal oxides

〇Riku Okamoto¹, Shigeru Ikeda¹, Akira Kimura¹, Ryota Tomizawa², Taizo Masuda², Kenichi Okumura² (1.Konan Univ., 2.TOYOTA MOTOR Corp.)

Keywords:semiconductor, photocatalyst, water splitting

Water splitting reactions using photocatalysis of semiconductor powders are expected to be a low-cost and clean technology for hydrogen production. While various powder photocatalysts have been studied, strontium titanate (SrTiO₃) based photocatalysts have recently been reported to exhibit apparent quantum yields (AQY) close to 100% by controlling the bulk structure by flux treatment and optimizing the surface catalytic sites. We attempted to reproduce the high AQY using SrTiO₃ powders obtained from various companies, but the AQY varied depending on the SrTiO₃ raw material used, and it was necessary to reexamine the photocatalytic synthesis conditions to obtain a high AQY. In this paper, we report the results of the optimization of the fluxing conditions and the effect of the addition of rare earth oxides to the fluxing agent as a study of the conditions for achieving high AQY using commercial SrTiO₃ raw materials.