Abstract
A brief introduction on the transport properties of PdH x system will be presented. The resistance ratio method is the most frequent technique used to measure the interstitial loading of hydrogen atoms into palladium. Using this technique a series of AC electrical resistance measurements of PdH x , demonstrating a stoichiometric values x > 1 obtained by electrochemical method at room temperature and pressure is presented. A full description of the used electrochemical method for preparing the samples PdH x with composition x > 1 and the analysis to determine the achieved composition will be presented. Conclusions on the electrical resistance of PdH x versus composition x and correlated physical phenomena have been done. In particular, these studies show the importance of the electrochemical processes efficiency. In order to have an accurate calculation of x value, precise efficiency amplitude estimation is needed. Our analysis underline the systematic underestimation of the x value in the well known PdH x relative electrical resistance versus x at room temperature as reported in literature.
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