钛片热氧化法制备光敏电极的研究

本文研究了以钛片为基底的TiO₂多晶薄膜电极的制备条件。发现在钛片热氧化和TiO₂膜的还原时,在气流中添加少量的水蒸气可解决TiO₂膜与基底结合不良的问题。制备了不同膜厚的光敏电极,研究了膜厚和光电流的关系。用热导法观察了氢气气氛下还原TiO₂的现象,研究了半导体化温度对光电流的影响。用制得的电极在日光下分解水制氢,能量转换效率为1.2%。

PREPARATION OF PHOTOSENSITIVE ELECTRODES BY THE THERMAL OXIDATION ON TITANIUM FOIL

The condition for the preparation of the electrodes of polycrystalline TiO₂ film on Ti foil was studied. It was found that the adhesive problem of the film with the substrate metal during the reaction of thermal oxidation of Ti and reduction of TiO₂ film might be solved by adding small amount of water vapor to the fluxional gas. Photosensitive electrodes with different thicknesses of film had been prepared. The relation between the thickness of film and photocurrent had been studied. By means of thermal conductivity detector, we studied the reducing condition of TiO₂ in hydrogen ambient. The influences of the different reducing temperature of TiO₂ on photocurrent were investigated. Using the TiO₂ electrode prepared, we have photoelectrolyzed water by sunlight with an energy conversion efficiency of 1.2%.