Abstract
TiO 2 nanotubes can reproducibly store up to∼2 wt% H 2 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 H 2 is physisorbed and can be reversibly released upon pressure reduction. Approximately 13% is weakly chemisorbed and can be released at 70°C as H 2, and ∼ 12% is bonded to oxide ions and released only at temperatures above 120°C as H 2O.
Original language | English |
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Pages (from-to) | 4124-4126 |
Number of pages | 3 |
Journal | Inorganic Chemistry |
Volume | 44 |
Issue number | 12 |
DOIs | |
State | Published - 13 Jun 2005 |
Externally published | Yes |