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Hydrogen electrosorption into Pd-Cd nanostructures.

Brian D Adams1, Cassandra K Ostrom, Aicheng Chen

  • 1Department of Chemistry, Lakehead University, 955 Oliver Road, Thunder Bay, ON P7B 5E1, Canada.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 27, 2010
PubMed
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This study explores hydrogen electrosorption in palladium-cadmium (Pd-Cd) alloys. Doping Pd with Cd enhances hydrogen sorption kinetics and reduces phase transitions, making Pd-Cd nanostructures promising for hydrogen applications.

Area of Science:

  • Materials Science
  • Electrochemistry
  • Hydrogen Technology

Background:

  • Hydrogen-absorbing materials are vital for hydrogen purification and storage.
  • Palladium (Pd) and its alloys are extensively researched for hydrogen dissociation catalysis and selective membranes.
  • Altering the Pd lattice with different-sized metal atoms significantly influences hydrogen absorption.

Purpose of the Study:

  • To investigate hydrogen electrosorption in nanostructured Pd-Cd alloys with varying Cadmium (Cd) compositions (0-15 at. %).
  • To determine the impact of Cd doping on hydrogen absorption capacity and kinetics.
  • To evaluate Pd-Cd alloys as potential materials for hydrogen sorption applications.

Main Methods:

  • Electrochemical techniques, including chronoamperometry and cyclic voltammetry, were employed.

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  • The ratio of H/(Pd + Cd) was determined at different potentials.
  • Hydrogen sorption kinetics and phase transitions (alpha to beta phase) were analyzed.

    • Main Results:

    • The maximum H/(Pd + Cd) ratio of 0.66 was observed for pure Pd, decreasing with increased Cd content.
    • The alpha to beta phase transition, the slowest step, was nearly eliminated in Pd-Cd (15%) alloys.
    • Increased Cd content led to more hydrogen absorption in the alpha phase region at higher potentials.

    Conclusions:

    • Pd-Cd nanostructures exhibit faster hydrogen sorption kinetics and reduced phase transition compared to pure Pd.
    • The elimination of the phase transition in Pd-Cd (15%) alloys is a significant finding.
    • Pd-Cd nanostructures are attractive for use as hydrogen dissociation catalytic capping layers or hydrogen-selective membranes.