Abstract
Dynamical property of the desorption process of hydrogen on platinum (100 and 111) surfaces has been investigated by an electrochemical method.In the method, the desorption process of hydrogen has been measured by the recovery process of the electromotive force (EMF) after breaking the short circuit of H2 H+ electrolyte | Pt single crystal cells.These recovery process and their temperature dependence have been analyzed by a random adsorpton site distribution model. The experimental result of Pt(100)-H system was in good agreement with the present model. An unusual result of Pt(111)-H system was interpreted by surface relaxation.From the above new analysis of the desorption process, the mean stay time of hydrogen on the Pt surface was evaluated.The activation energy of the process was obtained from their Arrhenius' analyses of the mean stay time, which was correspond to the adsorption energy of hydrogen.
