Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6601376 | Electrochemistry Communications | 2014 | 4 Pages |
Abstract
Thermodynamics of hydride formation and decomposition in electrodeposited Pd-rich (> 90 at.% Pd in the bulk) Pd-Ru alloys was studied in acidic solutions (0.5 M H2SO4) using chronoamperometry. It has been found that for the temperature range 283-328 K the potentials of the α â β and β â α phase transitions are shifted negatively with both increasing temperature and decreasing Pd content in the alloy bulk. Thermodynamic parameters (Gibbs energy, enthalpy and entropy) of the β-phase formation and decomposition were determined. With decreasing Pd bulk content the process of the β-phase formation becomes less exothermic, entropy rises and thermodynamic stability of the β-phase decreases. The heats of hydride formation in Pd-Ru alloys decrease almost linearly with the values of Fermi energies.
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Chemical Engineering
Chemical Engineering (General)
Authors
K. Hubkowska, M. Åukaszewski, A. CzerwiÅski,