Modification of Titania nanotube for Hydrogen Generation from photocatalytic splitting water

• Main Authors: Chin-Hao Chan, 詹晉豪
• Other Authors: Hong-Wen Wang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/98366605593808884568

碩士 === 中原大學 === 化學研究所 === 101 === CdS and Fe2O3-sensitized TiO2 nanotube arrays (TNA) was fabricated by inserting CdS and Fe2O3 nanoparticles into TNA via ultrasonic-assisted chemical bath deposition, and its effect on photocatalytic properties and hydrogen generation rate were discussed in this study. CdS-sensitized TNA lacked of absorption on long wavelength region and stability on hydrogen generation, so we used Fe2O3 which has lower bandgap to improve absorption properties and hydrogen generation efficiency. The results show that co-sensitized TNA had good apsortion ability on long wavelength region and good stability in eight hours hydrogen generation experiment. The hydrogen generation rate for Fe2O3/CdS and CdS/Fe2O3 were 12 and 1.54 mlcm-2h-1. The rate of hydrogen generation for Fe2O3/CdS was five times higher than TNA-blank(2.43 mlcm-2h-1), but CdS/Fe2O3 had lower hydrogen generation efficiency. The mechanism derivation was designed by measuring the shift of the Fermi level of two semiconductors due to their contact. Co-sensitized Fe2O3/CdS had stepwise structure and is advantageous to transition for excited electrons and holes, but CdS/Fe2O3 had a reverse structure which results in recombination of electron and hole. Therefore, Fe2O3/CdS had better photocurrent performance and hydrogen generation rate.