Nanotube of vanadium oxide used as a negative electrode in Ni-MH accumulator

Hydrogen is one of the most abundant elements on earth and its combustion in oxygen provides a larger amount of heat than conventional energy sources. Furthermore, the absence of carbon prevents any CO2 emissions which make hydrogen a clean energy carrier, renewable and highly energetic. Usable in Fuel Cells and NiMH battery, hydrogen, however, has two serious drawbacks that must be resolved: the mass production and storage. The vanadium oxide nanostructures (VOx-NTs) have an important feature of energy storage; they are studied as electrode material in lithium rechargeable battery. The importance of development of these materials is on the oxidation number of transition metals and the redox-active properties and their electrochemical properties. For our work we will study the storage of hydrogen in these nanotubes. In this paper we propose to synthesize vanadium oxide nanotube by a chemical method, we determined the electrochemical capacity of hydrogen storage and a study by electrochemical impedance spectroscopy.