Fig. 2. TEM images of Rh_0.5Cr_1.5O₃(0.2 wt%)/AgTaO₃ (a) before and (b) after photocatalytic water splitting under UV irradiation using a 300 W Xe-arc lamp. AgTaO₃ was synthesized by a solid state reaction at 1273 K for 15 h without excess Ag. Rh_0.5Cr_1.5O₃ was loaded by an impregnation method at 623 K for 1 h.