Room-temperature hydrogen uptake by TiO 2 nanotubes

San Hua Lim, Jizhong Luo, Ziyi Zhong, Wei Ji, Jianyi Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

199 Scopus citations

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 languageEnglish
Pages (from-to)4124-4126
Number of pages3
JournalInorganic Chemistry
Volume44
Issue number12
DOIs
StatePublished - 13 Jun 2005

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