Author(s): Lim SH, Luo J, Zhong Z, Ji W, Lin J
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Abstract TiO(2) nanotubes can reproducibly store up to approximately 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 degrees C as H(2), and approximately 12\% is bonded to oxide ions and released only at temperatures above 120 degrees C as H(2)O.
This article was published in Inorg Chem
and referenced in Journal of Nanomedicine & Nanotechnology