Electrochemical hydrogen storage of aligned multi-walled carbon nanotubes

Hydrogen storage of aligned multi-walled carbon nanotubes (a-MWNTs), non-aligned MWNTs (n- MWNTs) and graphite electrodes are studied by the electrochemical measurements. The electrodes are prepared by mixing carbon nanotubes (CNTs), copper powder and PTFE binder in a weight ratio of 1:5:3 and compressing the mixture into porous nickel collector. The results show that the electrochemical hydrogen storage capacity of the a-MWNT electrode is up to 1625 mAh/g, corresponding to a high hydrogen storage of 5.7 wt%, which is 10 times that of graphite electrode and is 13 times that of n-MWNT electrode, suggesting that a-MWNTs are promising materials for electrochemical hydrogen storage.