Its use in purification and hydrogen storage of carbon filaments

Suitable for storing hydrogen at a low temperature low pressure, carbon structures such as carbon nanofibers are produced by a method selective oxidation and / or acid reflux. The method includes the step of heating the impure mixture presence oxidizing gas, a substantial amount of amorphous carbon impurities in the mixture at a sufficient temperature and time to selectively oxidized to remove comprising crystalline carbon. Metal containing impurities in the mixture are also removed by contacting the acid that incidental impurities and desired carbon, it is possible to obtain a carbon fiber that does not contain carbon impurities and metal impurities other than carbon fiber to substantially . According to another aspect of the present invention, hydrogen can be stored purification carbon structure is provided with low pressure low temperature. .FIELD 1