空气电极改性TiO_2光催化剂的研究

A Study of TiO_2 Photo-catalyst Modified by Air Electrode

将 Ti O2 / C光催化剂负载在具有合成 H2 O2 性能的空气电极上形成双功能新型复合电极 .Ti O2 / C光催化层的微多孔特性使新型载体保持了高效合成 H2 O2 的优势 ,J=1 5 m A/ cm2 时 ,电流效率达到 82 % .新型载体又为 Ti O2 / C光催化剂获得了阳极偏压 ,有利于将光生电子迅速导入载体 ,减少了光生载流子的复合 .在新型光催化体系中 ,光化学氧化作用与光催化氧化作用有机地统一在同一电极 /溶液界面附近 ,造成了该界面的强氧化环境 ,从而使有机分子的氧化降解速度得到显著提高 .

A novel composite electrode which has both of the functions of synthesizing H 2O 2 and photocatalysis is reported. This double function composite electrode was prepared by loading the photocatalyst TiO 2/C on a novel substrate which can synthesize H 2O 2. The porous properties of TiO 2/C photocatalysis layer can make the novel carrier synthsizing H 2O 2 efficiently. The current efficiency attained a value of 82%(J=15 mA/cm 2), and the novel carrier made TiO 2 gaining an anodic bias which is very important for improving the photocatalytic activity of TiO 2. In this novel system, photochemistry and photocatalysis oxidization were combined near the interface of electrode/solution and thus the degradation rate of organic molecules enhanced rapidly.