Repeatable hydrogen adsorption using nanostructured graphite at room temperature

Kajiura, H.; Kadono, K.; Tsutsui, S.; Murakami, Y.
March 2003
Applied Physics Letters;3/24/2003, Vol. 82 Issue 12, p1929
Academic Journal
Repeatable hydrogen adsorption and desorption by nanostructured graphite was confirmed using a high-accuracy volumetric measuring apparatus at room temperature. The nanostructured graphite was prepared from graphite powder using a mechanical milling process at a pressure of 2.0 × 10[sup -4] Pa. The untreated graphite adsorbed 0.02 wt % of hydrogen, while 0.20-0.25 wt % of hydrogen can be repeatedly adsorbed by the nanostructured graphite. Measurements of the hydrogen adsorption rate at constant pressure and pore-size distribution suggest that the hydrogen molecules are adsorbed through a diffusion process into pores with a diameter less than 1 nm.


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