A metal dusting process for preparing nano-sized carbon materials and the effects of acid post-treatment on their hydrogen storage performance

Jeng-Kuei Chang*, Heng Yi Tsai, Wen Ta Tsai

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The preparation of various nano-sized carbon materials (NCMs) using a metal dusting process, in which a stainless steel coupon and CO-CO2 mixed gas are the only reactants needed, is demonstrated in this study. During the process, fresh Fe-Ni nano-particles, which catalyze the formation of the NCMs, are produced spontaneously and continuously from the steel. The possibility of using multi-wall carbon nanotubes (CNTs) prepared at 600 °C as a hydrogen storage material is studied. Our electrochemical testing results indicate that the obtained CNTs have a hydrogen discharge capacity of as high as 104 mAh/g after being etched in 15 M boiling nitric acid solution for 4 h. However, it was found that prolonging the etching time not only decreases crystallinity but also damages the tubular structure of the CNTs, degrading the hydrogen storage performance.

Original languageEnglish
Pages (from-to)6734-6742
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume33
Issue number22
DOIs
StatePublished - 1 Nov 2008

Keywords

  • Hydrogen storage
  • Metal dusting
  • Nano-sized carbon materials
  • Post-treatment

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