g-C_3N_4 coated SrTiO_3 as an efficient photocatalyst for H_2 production in aqueous solution under visible light irradiation

摘要

A highly active photocatalyst based on g-C_3N_4 coated SrTiO_3 has been synthesized simply by decomposing urea in the presence of SrTiO_3 at 400℃. The catalyst demonstrates a high H_2 production rate ~440 nmol h Vg catalyst in aqueous solution under visible light irradiation, which is much higher than conventional anion doped SrTiO_3 or physical mixtures of g-C_3N_4 and SrTiO_3. The improved photocatalytic activity can be ascribed to the close interfacial connections between g-C_3N_4 and SrTiO_3 where photo-generated electron and holes are effectively separated. The newly synthesized catalyst also exhibited a stable performance in the repeated experiments.