Achievement of High Photocatalytic Performance to BaTi₄O₉ Toward Overall H₂O Splitting

The improvement of photocatalytic activity of BaTi₄O₉ to overall H₂O splitting was investigated. From the evaluation of co-catalysts, Rh_0.7Cr_1.3O₃ was preferable. However, this co-catalyst was degrading with the progress of the photocatalytic reaction. When CoO_x was co-loaded as the co-catalyst for O₂ evolution reaction over the surface, the steady progress of the photocatalytic reaction can be confirmed. Here, effective way and condition for loading CoO_x co-catalyst as well as effective preparation method of BaTi₄O₉ were demonstrated in order to improve the photocatalytic activity of BaTi₄O₉ with Rh_0.7Cr_1.3O₃ and CoO_x co-catalysts to the overall H₂O splitting. As the results, the photocatalyst prepared by preferable method and condition showed high photocatalytic activity to the overall H₂O splitting, where the apparent quantum yield (AQY) at 313 nm reached to 41 %.