Preparation and Characterization of ZnO Arrays and Their Photocatalytic Applications
翁立彥1,2*, 張鈺雪2, 林志明1, 林彥谷2
1Department of Applied Science Materials Science, National Tsing Hua University, Hsinchu, Taiwan
2Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, Taiwan
* presenting author:Li-Yen Weng,
Global climate warming and environment pollution have spurred scientists to develop new high-efficient and environmental-friendly energy technologies. Hydrogen is an ideal fuel for fuel cell applications. Hydrogen has to be produced from renewable and carbon-free resources using nature energies such as sunlight if one thinks of clean energy and environmental issues. In this regard, a photoelectrochemical (PEC) cell consisting of semiconductor photoelectrodes that can harvest light and use this energy directly for splitting water is a more promising way for hydrogen generation. Abundant and inexpensive oxide semiconductor such as ZnO has been recognized as a promising photoelectrode, but the photoconversion efficiency is substantially limited by its large band gap and rapid charge recombination. In this work, the one-dimensional ZnO nanostructure was grown by hydrothermal method at low temperature with enhanced PEC water splitting as the main target. The nanostructured ZnO was well-characterized by scanning electron microscopy (SEM), UV-vis spectroscopy, X-ray diffraction (XRD), Ultraviolet–visible spectroscopy, and X-ray absorption spectroscopy (XAS). From the PEC tests, the significant photocurrent density of 0.95 mA cm-2 could be successfully achieved.

Keywords: zinc oxide , nanorods, sol-gel, hydrothermal, Photoelectrochemical