Improved hydrogen storage performance of defected carbon nanotubes with Pd spillover catalysts dispersed using supercritical CO2 fluid

Chih Yao Chen, Jeng-Kuei Chang*, Wen Ta Tsai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Hydrogen storage properties of carbon nanotubes (CNTs) modified by oxidative etching and decoration of Pd spillover catalysts are investigated. A mixed H2SO4/H2O2 solution containing ferrous ions (Fe2+) is useful to open the caps, to shorten the length, and to generate defects on CNTs. The Pd catalysts are deposited on the CNTs with the aid of supercritical carbon dioxide (scCO2); as a result, a highly dispersed Pd nanoparticles and an intimate connection between Pd and carbon surface can be obtained. Combination of the two approaches can optimize a hydrogen spillover reaction on CNTs, resulting in a superior hydrogen storage capacity of 1.54 wt% (at 25 °C and 6.89 MPa), which corresponds to an enhancement factor of ∼4.5 as compared to that of pristine CNTs.

Original languageEnglish
Pages (from-to)3305-3312
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume37
Issue number4
DOIs
StatePublished - 1 Feb 2012

Keywords

  • Hydrogen storage
  • Nanostructured carbon
  • Oxidative etching
  • Spillover
  • Supercritical fluid

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