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Investigation of hydrogen storage capacity of various carbon materials

2007; Elsevier BV; Volume: 32; Issue: 13 Linguagem: Inglês

10.1016/j.ijhydene.2006.11.012

1879-3487

Weiqing Xu, Kunimitsu Takahashi, Y. Matsuo, Yoshiyuki Hattori, Mikio Kumagai, Shintaro Ishiyama, Katsumi Kaneko, Sumio Iijima,

Carbon Nanotubes in Composites

Hydrogen storage capacity of various carbon materials, including activated carbon (AC), single-walled carbon nanohorn, single-walled carbon nanotubes, and graphitic carbon nanofibers, was investigated at 303 and 77 K, respectively. The results showed that hydrogen storage capacity of carbon materials was less than 1 wt% at 303 K, and a super activated carbon, Maxsorb, had the highest capacity (0.67 wt%). By lowering adsorption temperature to 77 K, hydrogen storage capacity of carbon materials increased significantly and Maxsorb could store a large amount of hydrogen (5.7 wt%) at a relatively low pressure of 3 MPa. Hydrogen storage capacity of carbon materials was proportional to their specific surface area and the volume of micropores, and the narrow micropores was preferred to adsorption of hydrogen, indicating that all carbon materials adsorbed hydrogen gas through physical adsorption on the surface.