全固态平面型ITO/Fe^3＋-TiO2/ITO光电催化器件的制备和催化性能

在具有条形电极的ITO(氧化铟锡)玻璃上负载Fe3 -TiO2薄膜,得到全固态平面型ITO/Fe3 -TiO2/ITO光电催化器件.利用Keithley 2400数字源电流表对器件施以一定的偏压,以气相甲醛的降解为模型反应,对器件分别进行了空气和氮气条件下的光电催化性能测试.结果表明,甲醛的存在能够增强体系的光电流,并且在氮气下器件的光电流明显大于在空气下的光电流,说明甲醛参与了电子的迁移过程.ITO/Fe3 -TiO2/ITO器件表现出比ITO/Fe3 -TiO2/ITO器件更高的光催化活性,且前者的光电流值小于后者,说明掺杂Fe3 所引起的电子迁移率的降低远大于所引起的激子分离几率的提高.ITO/Fe3 -TiO2/ITO器件在外加偏压下活性提高,但提高的幅度没有ITO/TiO2/ITO器件明显.

Preparation and Performance of ITO/Fe3+-TiO2/ITO Solid-State Planar Photoelectrocatalytic Devices

A Fe3 -TiO2 film was fabricated on the ITO(indium tin oxide)substrate to make solid planar photoelectrocatalytic devices ITO/Fe3 -TiO2/ITO.The photoelectrocatalytic performance of the ITO/Fe3 -TiO2/ITO device under air and nitrogen conditions was tested using gaseous formaldehyde degradation as the model reaction.The device current was measured using a Keithley 2400 SourceMeter instrument.The results showed that the existence of HCHO increased the photocurrent of the photoelectrocatalytic system.Furthermore,the photocurrent under nitrogen was higher than that under air.This indicated that HCHO participated in the transfer of electrons.The photocatalytic activity of the ITO/Fe3 -TiO2/ITO device was higher than that of ITO/TiO2/ITO,which suggested that Fe3 had entered the crystal lattice of TiO2.The photocurrent of ITO/Fe3 -TiO2/ITO was less than that of ITO/TiO2/ITO,indicating that the decrease in the rate of electron transfer resulting from the Fe3 doping was much higher than the improvement of the dissociation efficiency of photogenerated excitons.Although the photocatalytic activity of ITO/Fe3 -TiO2/ITO was enhanced under bias,this activity increase was less obvious than that of ITO/TiO2/ITO.