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On the Nature of Voltammetric Signals Originating from Hydrogen Electrosorption into Palladium-Noble Metal Alloys
Department of Chemistry, Warsaw University, Pasteura 1, Warsaw 02-093, Poland
* Author to whom correspondence should be addressed.
Received: 28 August 2013; in revised form: 8 October 2013 / Accepted: 12 October 2013 / Published: 22 October 2013
Abstract: Hydrogen sorption/desorption signals observed on cyclic voltammograms in experiments on hydrogen electrosorption into Pd-noble metal alloys (Pd-Au, Pd-Pt, Pd-Rh, Pd-Ru, Pd-Pt-Rh, Pd-Pt-Au) were characterized. The influence of electrosorption potential, scan rate and alloy bulk composition on the features of the hydrogen peaks was investigated. The experimental results were compared with those obtained on the basis of a model taken from the literature. It was confirmed that the rate of the α-β phase transition controls the overall rate of the process of hydrogen absorption/desorption into/from thin Pd-based electrodes. It was demonstrated that from the analysis of the changes of the hydrogen oxidation peak potential with the hydrogen electrosorption potential in cyclic voltammetric experiments it is possible to determine the limiting Pd bulk content, below which the β-phase in the alloy-hydrogen system is not formed.
Keywords: palladium alloys; limited volume electrodes; hydrogen adsorption and absorption; cyclic voltammetry; phase transition
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Łukaszewski, M.; Hubkowska, K.; Koss, U.; Czerwiński, A. On the Nature of Voltammetric Signals Originating from Hydrogen Electrosorption into Palladium-Noble Metal Alloys. Materials 2013, 6, 4817-4835.
Łukaszewski M, Hubkowska K, Koss U, Czerwiński A. On the Nature of Voltammetric Signals Originating from Hydrogen Electrosorption into Palladium-Noble Metal Alloys. Materials. 2013; 6(10):4817-4835.
Łukaszewski, Mariusz; Hubkowska, Katarzyna; Koss, Urszula; Czerwiński, Andrzej. 2013. "On the Nature of Voltammetric Signals Originating from Hydrogen Electrosorption into Palladium-Noble Metal Alloys." Materials 6, no. 10: 4817-4835.