Abstract
A storage capacity of hydrogen in multi-wall carbon nanotubes (MWCNTs) forest has been investigated experimentally using a langasite oscillator from vacuum to 100 kPa at room temperature. MWCNTs were directionally grown on the langasite oscillator using chemical vapor deposition at 750 °C, where langasite retains its oscillating property. Modification of MWCNTs on the langasite oscillator were conducted by atomic oxygen irradiation to induce the open-ended structure of the MWCNTs. The hydrogen storage capacities of MWCNTs directly grown on the oscillator were successfully evaluated, and the maximum hydrogen storage capacity was improved 60% with the modification of MWCNTs by atomic oxygen irradiation.
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