• Annotatsiya

Hydrogen is considered as renewable, and a clean energy carries and a clean fuel without toxic emission and can easily fuel cells for electricity generation. Hydrogen is highly required for advance energy conversion system.  One of the potential uses of hydrogen lies in zero emission vehicle powered by a proton exchange membrane fuel cell stack. However, the storage of this substance is considered one of the most important points, therefore this research is focused on usage of nanotubes of carbon. The discovery of high hydrogen storage capacity of carbon nanotube makes an onboard hydrogen storage system based on carbon nanotube very promising. In this research, the basics and unique properties of carbon nanotubes introduced, and the development of synthesis technologies of this novel material is summarized. As well as the unique pore and surface structures of carbon nanotubes are evaluated. Based on the experimental results and theoretical predictions that hydrogen can be effectively adsorbed in carbon nanotubes and after suitable pretreatment, carbon nanotubes may achieve a hydrogen storage capacity higher that 6.5 wt% and 63 kgH2/m3.  

Nevertheless, efforts have to be made to reproduce and verify the hydrogen storage capacity of carbon nanotubes both theoretically and experimentally, to investigate their volumetric capacity and cycling characteristics, to elucidate their adsorption/desorption dynamics, kinetics and mechanism, and finally to clarify the feasibility of carbon nanotubes as a practical onboard hydrogen storage material.