Abstract
In the present study, the creation of carbon fibre-Pd electrodes after several ion exchange-reduction procedures, is investigated. Ion exchange takes place between the H + ions of the functional acidic groups of the electrochemically oxidized carbon fibres and the Pd 2+ ions and is followed by chemical or electrochemical reduction of Pd 2+ to Pd 0. The mixed CPd electrode systems are studied by cyclic voltammetry, scanning electron microscopy (SEM) and EDAX spectroscopy. The study is completed by impedance spectroscopic measurements at the potential of hydrogen evolution in H 2SO 4 solutions. The comparison of the SEM and EDAX micrographs shows that the chemically obtained CPd systems have a larger effective surface area. The low values of the charge transfer resistance, especially in the case of the chemical reduction, indicate the strong electrocatalytic properties of the prepared electrodes for the hydrogen evolution reaction.
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