Room-Temperature Hydrogen Uptake by TiO2 Nanotubes
- 14 May 2005
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 44 (12) , 4124-4126
- https://doi.org/10.1021/ic0501723
Abstract
TiO2 nanotubes can reproducibly store up to ∼2 wt % H2 at room temperature and 6 MPa. However, only about 75% of this stored hydrogen can be released when the hydrogen pressure is lowered to ambient conditions, suggesting that both physisorption and chemisorption are responsible for the hydrogen uptake. FTIR spectroscopy, temperature-programmed desorption (TPD), and pressure−composition (P−C) isotherms suggest that 75% of the H2 is physisorbed and can be reversibly released upon pressure reduction. Approximately 13% is weakly chemisorbed and can be released at 70 °C as H2, and ∼12% is bonded to oxide ions and released only at temperatures above 120 °C as H2O.Keywords
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