Synthesis and Photocatalytic Properties of Cu2O/BiOCl semiconductor films

摘要

Cu2O/BiOCl composite films were synthesized by a simple two-step-method: sol-gel dip-coating technique and magnetron sputtering.At first,the BiOCl thin film was prepared on indium tin oxide (ITO) substrate via a simple sol-gel dip-coating technique.Then the Cu2O thin film was fabricated on the surface of the BiOCl thin film by magnetron sputtering.Their photocatalytic activities were evaluated by photocatalytic degradation of Rhodamine B (RhB) under UV and visible light irradiation,respectively.It was found that the photocatalytic activity of the Cu2O/BiOCl composite films was higher than single BiOCl thin film and signle Cu2O thin film.The photocatalytic efficiency of the as-synthesized films seems to strongly depend,that is mainly due to both of the Cu2O works as a sensitizer absorbing visible light and the Cu2O/BiOCl hetero-junction promoting the separation rate of photo-generated electron-hole pairs.The mechanism has been discussed on the interparticle charge transfer between two semiconductors while they have the suitable relative band position.