Articles
  • Room temperature hydrogen uptake of titanate nanotube powder with different H2O and sodium contents synthesized by a hydrothermal methodin aqueous NaOH solution
  • Junhan Yuha,* and Wolfgang M. Sigmundb
  • a Global Technology Center, POSCO, 892 Daechi-dong, Gangnam-gu, Seoul 135-777, Korea b Department of Materials Science and Engineering, University of Florida, Gainesville, Fl. 32611 USA
Abstract
Titanate nanotube powders with high specific surface area for hydrogen storage were synthesized by alkaline hydrothermal treatment of a TiO2 powder at 150 oC for 48 hrs. With controlling contents of H2O and Na+ in synthesized titanate powders, via ion-exchanging and drying processes, their hydrogen uptake characteristics were evaluated. The titanate nanotube powders showed an increase in the specific surface area with the decreases in Na+ content by the ion-exchanging process and in H2O content by drying processes, but in reverse an decrease in that with severe ion-exchanging or over-drying at high temperature. Their hydrogen uptake increased with decreasing H2O contents in the powders with appropriate Na+ content only under no changing in the particle shape. Therefore, the powders with controlled H2O and Na+ contents had high hydrogen uptake of 2.21 wt% at 90 atm due to proper support of Na+ for interlayer distance in multi-walled tube typed titanate particle.

Keywords: Titanate nanotube, Hydrogen uptake, Alkaline hydrothermal process, Adsorption-isotherm, TiO2, Interlayer distance.

This Article

  • 2015; 16(1): 74-80

    Published on Feb 28, 2015