A frequency response (FR) method was applied to a hydrogen/hydrogen-storage alloy system. The FR data were analyzed on the basis of two models consisting of two or three rate processes: (i) X?A?C and (ii) X?A?B?C, where X denotes a hydrogen molecule in the gas phase, A is a hydrogen molecule (or atom) adsorbed on the surface, B is atomic hydrogen adsorbed on the surface, and C is atomic hydrogen absorbed in the lattice. Rate coefficients at every rate process in the model were evaluated by computer simulation. It was concluded that this FR method is useful for characterizing valid hydrogen storage alloys, because both the rate coefficients concerned with adsorption-desorption and also diffusion occurring in series can be determined.
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