Synthesis of porous carbon nanofibers by an injection CVD method and their applications in hydrogen storage
H-C Wu, Y-Y Li
National Chung Cheng University, TW
carbon nanofibers, hydrogen storage
An effective production of porous carbon nanofibers was obtained in the presence of sulfur by an injection chemical vapor deposition (CVD) method using alcohol as the carbon source and ferrocene as the catalyst. The scanning electron microscopy (SEM) images showed that the diameter of porous carbon nanofibers was in the range of 50-70 nm. The high resolution transmission electron microscopy (HRTEM) analysis revealed that the microstructure of porous carbon nanofibers was composed of disorder graphene layers and graphitic pore walls. The thermogravimetry analysis (TGA) showed that the as-produced porous carbon nanofibers possessed a poor thermal stability (500 oC) which was lower then that of carbon nanotubes. Due to the simplicity of the present technique, the injection CVD method may be suitable for scale-up for mass production. Furthermore, the hydrogen storage capacity of the material was measured by volumetric method and the study was carried out at 298 K and the pressure up to 700 psi. The result showed that the porous carbon nanofibers can have a hydrogen storage capacity of more than 10.5 wt%. We believe that the material is potential for energy storage (hydrogen, methane).
Nanotech 2008 Conference Program Abstract