Thermoelectric study of hydrogen storage in carbon nanotubes

G. U. Sumanasekera, Kofi W. Adu, B. K. Pradhan, G. Chen, H. E. Romero, P. C. Eklund

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

In situ resistivity (ρ) and thermoelectric power (S) have been used to study the nature of the adsorption of hydrogen in bundles of single-walled carbon nanotubes for H2 pressure P≤1 atm and temperatures 77 K <T<500 K. Isothermal plots of S vs Δρ/ρ0 are found to exhibit linear behavior as a function of gas coverage, consistent with a physisorption process. Studies of S, ρ at T=500 K as a function of pressure exhibit a plateau at a pressure P ∼ 40 Torr, the same pressure where the H wt. % measurements suggest the highest binding energy sites are being saturated. The effects of H2 exposure at 500 K on the thermoelectric transport properties are fully reversible.

Original languageEnglish (US)
Article number035408
Pages (from-to)354081-354085
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number3
StatePublished - Jan 15 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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