Title :
Carbon as a high capacity solid state storage medium for hydrogen
Author :
Ahn, C.C. ; Ye, Y. ; Ratnakumar, B.V. ; Witham, C. ; Bowman, R.C., Jr. ; Fultz, B.
Author_Institution :
Dept. of Eng. & Appl. Sci., California Inst. of Technol., Pasadena, CA, USA
Abstract :
Graphite nanofibers were synthesized and their hydrogen desorption and adsorption properties are reported for temperatures of 77 and 300 K. Catalysts were made by several different methods including chemical routes, mechanical alloying and gas condensation. The nanofibers were grown by passing ethylene and H2 gases over the catalysts at 600°C. Hydrogen desorption and adsorption were measured using a volumetric analysis Sieverts´ apparatus, and the graphite nanofibers were characterized by transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) surface area analysis. The absolute level of hydrogen desorption measured from these materials was typically less than 0.01 H/C atom, comparable to other forms of carbon
Keywords :
adsorption; carbon nanotubes; catalysts; desorption; graphite; hydrogen economy; transmission electron microscopy; 300 K; 600 C; 77 K; Brunauer-Emmett-Teller surface area analysis; C; H2; H2 gases; TEM; carbon; catalysts; ethylene; gas condensation; graphite nanofibers synthesis; high capacity solid state storage medium; hydrogen adsorption; hydrogen desorption; hydrogen storage material; mechanical alloying; transmission electron microscopy; volumetric analysis Sieverts´ apparatus; Alloying; Area measurement; Atomic measurements; Chemicals; Gases; Hydrogen storage; Mechanical factors; Solid state circuits; Temperature; Volume measurement;
Conference_Titel :
Battery Conference on Applications and Advances, 1999. The Fourteenth Annual
Conference_Location :
Long Beach, CA
Print_ISBN :
0-7803-4967-9
DOI :
10.1109/BCAA.1999.795968
