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

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

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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 language	English (US)
Article number	035408
Pages (from-to)	354081-354085
Number of pages	5
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	3
State	Published - Jan 15 2002

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

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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 0 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.",

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AU - Chen, G.

AU - Romero, H. E.

AU - Eklund, P. C.

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N2 - 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 0 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.

AB - 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 0 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.

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Thermoelectric study of hydrogen storage in carbon nanotubes

Abstract

All Science Journal Classification (ASJC) codes

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