Effects of pH and Anion on Hydrogen Sorption/Desorption at/within Oxide‐Derived Pd Electrodes

Oxide‐derived Pd electrodes were obtained by cathodic polarization of Pd oxide‐coated titanium electrodes (fabricated by thermal decomposition) at 0 V (RHE) for 30 min in 1.5 mol dm −3 , Hydrogen adsorption/absorption (denoted hereafter as sorption) and desorption within/at these electrodes were obtained using cyclic voltammetry (CV), chronopotentiometry, and linear sweep voltammetry (LSV). CV results revealed that formation/oxidation is more reversible in either concentrated acid or base solutions than in intermediate pH media and the rate of desorption is faster in a pH solution <10. The oxidation of is electron transfer controlled in intermediate pH media, especially in weakly basic solutions due to the adsorption of . The sequence of anions with respect to increasing ability to inhibit hydrogen sorption is: .