Abstract
The hydrogen absorption (HAR) and desorption (HDR) reactions in thin palladium electrodes are studied using the potential step method in order to analyse the mechanism of phase transformation. Transient current responses ( i– t's) are recorded at the onset of the potential step for 47 μm thick Pd electrodes in 1 M H 2SO 4 at ambient temperature. A model based on a moving boundary mechanism is proposed to account for the experimental i– t's. The HAR shows interfacial kinetic limitations and only numerical solutions can be obtained. Such kinetic limitations do not exist for the HDR and a semi-analytical solution which satisfactorily fits the experimental data is proposed.
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