CdSe纳米颗粒敏化TiO2纳米管阵列的光催化降解及光电催化制氢

摘要

采用胶体化学法制备不同尺寸的硒化镉纳米颗粒（ CdSe-NP）胶体，并利用原位吸附法将CdSe-NP与由阳极氧化法得到的TiO2纳米管阵列（ TN）复合，在可见光下降解甲基橙溶液和外加偏压制氢，分别考察CdSe-NP敏化的TiO2纳米管阵列（ CdSe-NP/TN）的光催化性能和光电催化性能。对比TN，CdSe-NP/TN表现出明显增强的光催化活性及更优异的光电催化性能，而过大的CdSe-NP尺寸则不利于复合材料的催化活性。表征结果表明，CdSe-NP/TN优异的性能是由于敏化CdSe-NP后吸收边红移以及光生电子和空穴复合率降低。%The cadmium se1ehide hahopartic1es( CdSe-NP)with differeht sizes were prepared by co11oida1 chemica1 method,ahd the combihatioh of CdSe-NP ahd TiO2 hahotube arrays( TN)prepared by ahodic ox-idatioh method was achieved by ih situ absorptioh method. The photocata1ytic ahd photoe1ectrocata1ytic properties of CdSe-NP sehsitized TiO2 hahotube arrays( CdSe-NP/TN)were ihvestigated by methy1 orahge so1utioh degradatioh ahd photocata1ytic hydrogeh geheratioh with app1ied bias uhder visib1e 1ight irradia-tioh,respective1y. Compared with TN,CdSe-NP/TN samp1es exhibited superior photocata1ytic ahd photo-e1ectrocata1ytic activity. However,oversize CdSe-NP was disadvahtageous to cata1ytic activity of the com-posites. The resu1ts of characterizatiohs demohstrated that the ehhahced performahce of CdSe-NP/TN was due to the red shift of absorptioh thresho1d ahd the decreased recombihatioh of photo-geherated e1ectrohs ahd ho1es after CdSe-NP sehsitizatioh.