Surface energy reduction by dissociative hydrogen adsorption on inner surface of pore in aluminum

Abstract

Dissociative hydrogen adsorption on inner surface of pore in aluminum is estimated based on statistical thermody-namics with experimental and first-principles calculational data. The relationship among hydrogen gas pressure, the amount of surface adsorbed hydrogen atoms, and the reduction of surface energy are derived with including the deviation from ideal gas for hydrogen at high pressure. The reduction of surface energy is found to depend on a small amount of difference in hydrogen adsorption energy.