Anisotropy in photocatalytic oxidization activity of NaNbO3 photocatalyst

Abstract

NaNbO₃ single-crystal films with (100), (110) and (111) oriented crystal planes were grown on LaAlO₃ (100), (110) and (111) substrates by pulsed laser deposition. The NaNbO₃ films exhibit anisotropy in the photocatalytic oxidization activity for Rhodamine B (RhB) degradation. The increasing order of RhB degradation in Ar atmosphere under full arc irradiation of a Xe lamp is (100) < (110) < (111), which is consistent with that of ˙OH generation. The good linear relationship between the activity of RhB degradation and the coercive electric field indicates that the photocatalytic activity is closely related to the ferroelectric property.