Active Control of Hydrogen Recycling by the Permeation and Absorption Techniques

Thy potential barrier of hydrogen dissociative absorption plays an outstanding role in the interaction of energetic hydrogen with solid [1–3]. The surface barrier does not impede the implantation of suprathermal hydrogen particles of an energy higher than ~ 1 eV, but it drastically impedes the thermal reemission of absorbed atoms. As a result, the presence of a surface barrier results in a dramatic increase of the absorption and permeation of suprathermal hydrogen. At definite conditions, the permeation reaches its conceivable limit when virtually the whole incident flux passes through the solid membrane irrespective of its temperature and thickness (the superpermeation).