https://scholars.lib.ntu.edu.tw/handle/123456789/503240
標題: | Photoelectrochemical activity on Ga-polar and N-polar GaN surfaces for energy conversion | 作者: | Lin, Y.-G. Hsu, Y.-K. Basilio, A.M. Chen, Y.-T. Chen, K.-H. YIT-TSONG CHEN |
公開日期: | 2014 | 出版社: | Optical Society of American (OSA) | 卷: | 22 | 期: | S1 | 起(迄)頁: | A21-A27 | 來源出版物: | Optics Express | 摘要: | Hydrogen generation through direct photoelectrolysis of water was studied using photoelectrochemical cells made of different facets of free-standing polar GaN system. To build the fundamental understanding at the differences of surface photochemistry afforded by the GaN {0001} and {000 -1} polar surfaces, we correlated the relationship between the surface structure and photoelectrochemical performance on the different polar facets. The photoelectrochemical measurements clearly revealed that the Ga-polar surface had a more negative onset potential relative to the N-polar surface due to the much negative flat-band potential. At more positive applied voltages, however, the N-polar surface yielded much higher photocurrent with conversion efficiency of 0.61% compared to that of 0.55% by using the Ga-polar surface. The reason could be attributed to the variation in the band structure of the different polar facets via Mott- Schottky analyses. Based on this work, understanding the facet effect on photoelectrochemical activity can provide a blueprint for the design of materials in solar hydrogen applications. © 2013 Optical Society of America. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/503240 | ISSN: | 10944087 | DOI: | 10.1364/OE.22.000A21 | SDG/關鍵字: | Energy conversion; Gallium nitride; Hydrogen production; Solar power generation; Surface structure; Flat-band potentials; Hydrogen generations; Photoelectrochemical measurements; Photoelectrochemical performance; Photoelectrochemicals; Photoelectrolysis; Schottky analysis; Surface photochemistry; Applied voltages; Electrochemistry |
顯示於: | 凝態科學研究中心 |
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