INFILTRATION OF MICROPOROUS CARBONS BY PYROLYSIS OF CH4 AND ITS EFFECT ON ENHANCEMENT OF RESISTANCE AGAINST OXIDATION

摘要

Pores within electrode-grade carbon ( EC ) and electrode-grade graphite ( EG ) were infiltrated by pyrolytic carbon by methane pyrolysis. Either sample showed an increase in resistance against oxidation with CO2. To elucidate the mechanism of this effect, the pore size distribution of mesopores and micropores were characterized for the original, infiltrated, oxidized sample and that oxidized after infiltration, respectively. It was found that the deposited carbon by infiltration decreased the surface area of micropores, extensively. This decrease in the effective area for oxidation with CO2 appears to increase in the resistance against oxidation.