In situ resistivity 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 % 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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Sumanasekera, G.U., Adu, C.K.W., Pradhan, B.K. et al. Thermoelectric Study of Hydrogen Storage in Carbon Nanotubes. MRS Online Proceedings Library 706, 1041 (2001). https://doi.org/10.1557/PROC-706-Z10.4.1