“…The conduction band minimum (CBM) of some perovskite oxides is not suitable for CO 2 photoreduction, such as BiFeO 3 , LaFeO 3 , and LaNiO 3 , while other perovskite oxides with proper conduction band have poor photocatalytic reaction efficiency, by virtue of the broad bandgap, fast charge recombination, and weak CO 2 activation at the surface. Up to now, several perovskite oxides have been proposed for photocatalytic CO 2 reduction, such as SrTiO 3 , [61,132] NaNbO 3 , [133,134] NaTaO 3 , [134,135] ANbO 3 (A = Li, Na, K), [67] and others. Due to the difference of A or B cations, the crystal structures of various perovskite oxides show diverse phases.…”