[15p-M_374-1~12] Advances in Energy Conversion Research through Photoactive Materials and Interface Engineering

4:00 PM - 4:15 PM JST(7:00 AM - 7:15 AM UTC)

[15p-M_374-8] Crystal and Electronic Structure Control of Perovskite Titanate Powders via Multicomponent Co-doping and Flux Synthesis for Photocatalytic Water Splitting

〇Shigeru Ikeda¹, Kaori Takagi¹, Fuma Ujiie¹, Ryota Tomizawa², Tomoya Nagano², Koji Hayashi² (1.Konan Univ., 2.Toyota Motor Corp.)

Keywords:

Titanate perovskite photocatalysts,Multication codoping,Quantum efficiency for water splitting

Titanate perovskite oxides are promising photocatalysts for water splitting, with SrTiO₃ showing high activity through aliovalent cation doping, while CaTiO₃ and BaTiO₃ remain less explored. In this study, multication codoping with Al³⁺, Sc³⁺, and Mg²⁺ combined with flux-assisted crystal growth was applied to SrTiO₃, CaTiO₃, and BaTiO₃. Controlled particle morphology, crystallinity, and defect states enabled efficient spatial separation of redox sites. As a result, high quantum efficiencies were achieved, including 66% at 365 nm for SrTiO₃ and 73.8% at 310 nm for CaTiO₃. Furthermore, codoped BaTiO₃ exhibited enhanced photocatalytic activity, demonstrating its viability as a water-splitting photocatalyst.