Voltammetric Investigation of Hydrogen Sorption/Desorption at/within Oxide-Derived Pd Electrodes in NaOH and H2SO4

Chi Chanq Hu, Ten Chin Wen

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22 Citations (Scopus)

Abstract

Oxide-derived Pd electrodes are prepared from PdO-coated titanium electrodes (fabricated by thermal decomposition) after polarization at 0 V (vs. reversible hydrogen electrode, RHE) for 30 min. Hydrogen sorption/desorption at/within these electrodes as well as that at ordinary bulk Pd were compared by cyclic voltammetry. In contrast to the results for a bulk palladium electrode, both hydrogen adsorption and absorption peaks are clearly observed on the negative CV sweeps and hydrogen evolution commences after the hydrogen absorption becomes saturated for the oxide-derived Pd electrodes in NaOH and H2SO4 solutions. Different sources of proton supply (H+/H3O+ in acid and H2O in base), HSO4, SO42- adsorption, and hydrogen damage of the Pd lattice structure account for the different responses in acidic and basic solutions. Surface morphologies of the bulk Pd and the oxide-derived Pd electrodes (where oxide is reduced in either acidic or basic solutions) were examined by scanning electron microscopy to elucidate the effect of surface roughness.

Original languageEnglish
Pages (from-to)2996-3001
Number of pages6
JournalJournal of the Electrochemical Society
Volume141
Issue number11
DOIs
Publication statusPublished - 1994 Jan 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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