Study on the characteristics and photoactivity for La-modified TiO2/ITO photocatalytic electrode
| Autor: | Wei-Fu Wang, 王維甫 |
|---|---|
| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 The aim of this study has been to develop the TiO2/ITO photocatalytic electrode, modified by Lanthanum, to enable high photocatalytic and photoelectrocatalytic activities under UV light and visible light irradiation. The different molar ratios of La/Ti (0.025, 0.050, 0.075 and 0.100) photocatalytic electrodes use in this study were synthesized by sol-gel method and dip-coating method. Both TiO2/ITO and La-TiO2/ITO photocatalytic electrodes were characterized by Field emission scanning electron microscope（FE-SEM）, Electron spectroscopy for chemical analysis system（ESCA）, X-ray diffractometer（XRD）and Isoelectric point（pHIEP）. The photocatalytic and photoelectrocatalytic activities were evaluated by the degradation of Acid Yellow 17. The XRD pattern of TiO2/ITO presents only anatase phases, but for La-TiO2/ITO presents both anatase and rutile phases. The contents of the rutile phase increased with the increase of the molar ratio of V/Ti. The SEM image of the La-TiO2/ITO showed particles of regular shapes with smaller size (＜10nm) compared to the TiO2/ITO, which presented uniform particles of spherical structure and larger size （20nm）. The La-TiO2/ITO photocatalytic electrode with molar ratio 0.050 shows the best ability both on the absorbtion and photocatalytsis. The photocatalytic electrodes modified by La shows the stronger photocatalytci ability under UV light then under visible light irradiation. Applied potential 2.0V would effectively increase the photoelectrocatlaytic activity under visible light irradiation. Keywords : Lanthanum、Indium-Tin Oxide、Photocatalytic、Photoelectrocatalytic |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|