Voltammetric investigation of hydrogen sorption/desorption at/within oxide-derived Pd electrodes in NaOH and H[sub 2]SO[sub 4]

Journal Article · Mon Oct 31 23:00:00 EST 1994 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2059271· OSTI ID:6711541

Hu, C C; Wen, T C ^[1]

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1. National Cheng Kung Univ., Tainan (Taiwan, Province of China). Dept. of Chemical Engineering

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 H[sub 2]SO[sub 4] solutions. Different sources of proton supply (H[sup +]/H[sub 3]O[sup +] in acid and H[sub 2]O in base), HSO[sub 4][sup +], SO[sub 4][sup 2[minus]] 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. This work clarifies the electrochemical behavior of hydrogen sorption and desorption at/within such electrodes in both NaOH and H[sub 2]SO[sub 4] solutions to further understanding of the interactions between Pd and H which is important to both organic hydrogenation and any possible Fleishmann and Pons' effect.

• OSTI ID: 6711541
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:11; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
ADSORPTION
ALKALI METAL COMPOUNDS
CATALYSTS
COLD FUSION
DESORPTION
ELECTROCATALYSTS
ELECTROCHEMICAL CELLS
ELECTROLYSIS
ELEMENTS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
HYDROXIDES
INORGANIC ACIDS
LYSIS
METALS
NONMETALS
NUCLEAR REACTIONS
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SORPTION
SORPTIVE PROPERTIES
SULFURIC ACID
SURFACE PROPERTIES
TRANSITION ELEMENTS
VOLTAMETRY