Abstract
Abstract An extensive experimental screening program to define the interactions between various gaseous impurities and rechargeable metal hydrides is summarized. Results are presented for LaNi5 and TiFe0.85Mn0.15 with the following gaseous impurities: CH3SH, H2S, CO, CO2, O2, NH3, CH4, C2H4 and N2. Alloy-impurity interaction effects can be placed in one or more of the following classifications: poisoning, retardation, reaction and innocuous. Cyclic loss of hydrogen capacity can be mathematically described by an exponential model that contains a damage function and a concentration dependence, both of which can be related to the interaction class and the damage mechanism. This model should be capable of giving a generalized representation of cyclic life in impure H2, as well as providing a useful means of extrapolating low cycle screening data for high cycle engineering design estimates.
Published Version
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