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 25 nm-thickness Pd nanorings distributed on the 77 nm-diameter size TiO2 nanotube showed a fast response time (3.8 s) and high sensitivity (92.05%) at 0.8 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.
|Number of pages||7|
|Journal||International Journal of Hydrogen Energy|
|State||Published - 2017|
Bibliographical noteFunding Information:
This work was supported by National Natural Science Foundation of China under Grant Nos. 61474016 and 61405026, 61405025, 61371046.
© 2017 Hydrogen Energy Publications LLC
- Composite structure
- Hydrogen sensor
- Pd nanorings
- TiO nanotube arrays
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology