Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5145245 | International Journal of Hydrogen Energy | 2017 | 7 Pages |
Abstract
Hydrogen sensors with a novel composite structure comprised of Pd nanorings distributed on TiO2 nanotube arrays were developed and tested. Effect of the TiO2 nanotube diameter size, Pd nanorings thickness on the sensors' hydrogen response characteristics were investigated. Time dependence of resistance of the Pd nanorings/TNTs composite structure on various hydrogen concentrations was also carried out and demonstrated good room temperature hydrogen sensitive characteristics. Optimized experiments demonstrated that the hydrogen sensor composed of 25Â nm-thickness Pd nanorings distributed on the 77Â nm-diameter size TiO2 nanotube showed a fast response time (3.8Â s) and high sensitivity (92.05%) at 0.8Â vol% H2. A hydrogen sensitive characteristics model is proposed and the Pd nanorings' important role in the hydrogen sensitive mechanisms is described. The hydrogen sensor's excellent hydrogen sensitive characteristics is ascribed to the Pd nanorings' quick and continual formation and breakage of multiple passages due to absorption and desorption of hydrogen atoms.
Related Topics
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Authors
Xiongbang Wei, Xiaohui Yang, Tao Wu, Shuanghong Wu, Weizhi Li, Xiaohui Wang, Zhi Chen,