Application of pressure programmed absorption and desorption to characterize hydriding and dehydriding kinetics

V. FUSTER; F. CASTRO; G. URRETAVIZCAYA

Maui, Hawaii, USA

Simposio; MH2006, International Symposium on Metal-Hydrogen Systems: Fundamentals and Applications; 2006

R.C. Bowmann Jr., C.M. Jensen, T.J. Udovic, Co-chairmans

Hydriding and dehydriding kinetics is an important aspect of the reaction of hydrogen with different hydride forming materials. In particular, it is a key factor in several applications of hydrogen from an energetic point of view. We present here the use of a recently developed technique to characterize hydrogen absorption and desorption kinetics: pressure programmed absorption and desorption (PPAD) [1]. The technique is based on an isothermal pressure-ramped measurement of the hydriding and dehydriding rate, and its principal advantages are the absence of an initial blind period, the short time required to complete an experimental run, and the possibility to perform consecutive hydrogen absorption and desorption cycles. To illustrate this, we present here the results obtained in the characterization by PPAD of the Pd-H, LaNi5-H, and Mg-H systems.