摘要
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- <sup>3</sup> NaOH. 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 (3-PdH formation/oxidation is more reversible in either concentrated acid or base solutions than in intermediate pH media and the rate of (3-PdH desorption is faster in a pH solution <10. The oxidation of 3-PdH is electron transfer controlled in intermediate pH media, especially in weakly basic solutions due to the adsorption of H <sub>2</sub> PO <sub>4</sub> /HPO <sub>4</sub> 2 <sup>-</sup> . The sequence of anions with respect to increasing ability to inhibit hydrogen sorption is: CH <sub>3</sub> COO <sup>-</sup> < Cl <sup>-</sup> < HSO <sub>4</sub> <sup>-</sup> ~CIO4 < HC <sub>2</sub> O <sub>4</sub> <sup>-</sup> < H <sub>2</sub> PO <sub>4</sub> <sup>-</sup> . © 1995, The Electrochemical Society, Inc. All rights reserved.