Hydrogen Storage of Multi-Walled Carbon Nanotubes Obtained by Decomposition of Hydrocarbon over Ni–Li/SiO_2

摘要

Hydrogen storage into multi-walled carbon nanotubes obtained by the decomposition of hydrocarbons using Ni–Li/SiO_2 was investigated. The optimized reaction conditions for the synthesis of carbon nanotubes were 873K and W/F = 40 g-cat.h/mol, and carbon nanotubes obtained by C_2H_6 decomposition were found to exhibit fairly large H_2 storage capacity of 1 wt% at room temperature. The storage capacity increased with decreasing temperature and a capacity of 5 wt% was achieved at 77K, with 66% of adsorbed hydrogen being desorbable. Hydrogen adsorption by orbital in C–C bond coordination is proposed, observing both weakened Raman adsorption C–C peaks and the thermal release of CH4 after H2 storage.