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| Loading cocatalyst on the semiconductor can improve the separation efficiency of the photo-generated charge carriers, and thereby increasing the photocatatlytic activity. So, investigation of the effect of cocatalyst on the photocatalytic mechanism attracted much attention in recent years. Herein, four different kinds of metal cocatalysts (Pt, Pd, Cu, Ni) were loaded on surface of BaTiO3/TiO2 heterojunction nanotubes array by the chemical reduction method. The morphology, phase structure, and loading amount of the cocatalyst -loaded BT films were characterized X-ray diffraction (XRD), scanning electron microscopy (SEM) systematically. The transient photocurrent- time curves showed that the loaded Pt nanoparticles can increase the photocurrent density of BT effectively, and at the same time, Pt/BT exhibited the best photocatalytic activity for MB degradation. The four kinds of cocatalyst played different roles in the enhancement of the photocurrent and photoactivity, but both of them followed this order: Pt/BT > Ni/BT > Cu/BT > Pd/BT > BT. |
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| Keywords:physico-chemistry; BaTiO3/TiO2 heterojunction; cocatalyst; photocatalyst |
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