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Related Experiment Videos

Room-temperature hydrogen uptake by TiO(2) nanotubes.

San Hua Lim1, Jizhong Luo, Ziyi Zhong

  • 1Department of Physics, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260.

Inorganic Chemistry
|June 7, 2005
PubMed
Summary

Titanium dioxide (TiO2) nanotubes store hydrogen effectively but release only 75% upon pressure reduction. The remaining hydrogen is chemically bound and requires higher temperatures for release, indicating complex storage mechanisms.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Hydrogen storage is crucial for clean energy technologies.
  • Titanium dioxide (TiO2) nanomaterials show promise for hydrogen storage applications.
  • Understanding hydrogen binding mechanisms in TiO2 is essential for optimizing storage capacity and release.

Purpose of the Study:

  • To investigate the storage capacity and release behavior of hydrogen in TiO2 nanotubes.
  • To elucidate the different hydrogen binding mechanisms (physisorption and chemisorption) within TiO2 nanotubes.
  • To quantify the reversible and irreversible hydrogen fractions stored in TiO2 nanotubes.

Main Methods:

  • Hydrogenation of TiO2 nanotubes at room temperature and 6 MPa.
  • Controlled depressurization to ambient conditions to assess reversible hydrogen release.

Related Experiment Videos

  • Fourier-transform infrared (FTIR) spectroscopy to identify chemical bonds.
  • Temperature-programmed desorption (TPD) to analyze gas release profiles.
  • Pressure-composition (P-C) isotherms to determine storage thermodynamics.

    • Main Results:

    • TiO2 nanotubes reproducibly store up to 2 wt% H2 at room temperature and 6 MPa.
    • Approximately 75% of the stored hydrogen is reversibly released upon pressure reduction, attributed to physisorption.
    • About 13% of the hydrogen is weakly chemisorbed and released as H2 at 70°C.
    • Approximately 12% is strongly chemisorbed, bonded to oxide ions, and released as H2O above 120°C.

    Conclusions:

    • TiO2 nanotubes exhibit significant hydrogen storage capacity with a dominant physisorption component.
    • The storage mechanism involves both reversible physisorption and irreversible chemisorption.
    • The chemisorbed hydrogen fractions require elevated temperatures for release, impacting overall system efficiency.