Influence of Phosphorus Content on Hydrogen Sorption in Pd−P Thin Layers Obtained by Electroless Deposition

Abstract

Thin deposits of Pd−P alloys of 2−17 at. % phosphorus content were obtained by electroless deposition. The studies of hydrogen absorption in this alloy were carried out using classical transient measurements and electrochemical impedance spectroscopy. The hydrogen insertion into the alloy was performed in an aqueous 0.1 M HClO4 solution, and electrosorption isotherms were then determined. The results indicate that the total amount of the hydrogen dissolved in the Pd−P alloy decreased with the increase of the phosphorus content. In contrast, for intermediate phosphorus contents 2−11 at. % hydrogen insertion at low hydrogen pressures was about 10 times higher than for pure palladium. This may be of crucial importance in electrocatalysis and hydrogenation.