Hydrogen storage by carbon nanotube and their films under ambient pressure

At room temperature and ambient pressure we studied the H2 storage in carbon nanotubes (CNTs) and precisely measured the H2 storage capacity with a sensitive sensor. The results show that at ambient pressure the H2 storage by CNTs obtained from arc discharge is a slow process which generally takes 25 h or above and the H2 storage capacity is very low. The CNTs films on Si substrate has demonstrated a high H2 uptake performance at ambient pressure. Although the time for H2 storage is long, the CNTs films obtained from chemical vapor deposition has a H2 storage capacity of 8.0% and the CNTs films produced by catalytic decomposition has even higher H2 storage capacity than that.