The Bromine Electrode. Part I: Adsorption Phenomena at Polycrystalline Platinum Electrodes

Ferro, S.; De Battisti, A.
October 2004
Journal of Applied Electrochemistry;Oct2004, Vol. 34 Issue 10, p981
Academic Journal
A cyclic voltammetric study of the behaviour of Br¯ and Br3¯ at Pt electrodes, in the potential range between hydrogen and oxygen evolution, is described. Different experiments were carried out, in the presence of Br¯ alone, and with a mixture of Br¯ and Br3¯, in which the ratio between the species has been kept constant and equal to 1. The halide concentration was varied between 4×10-6 and 1×10-3 moldm-3, at constant ionic strength, in 1M HClO4 as well as in 1M NaClO4 adjusted to a pH of 2. Underpotential deposition of Br is observed at potentials as low as −0.125V vs SCE. The adsorption parameters of Br species were determined from the adsorption/desorption peak pair in the hydrogen adsorption/desorption region, and from the oxide reduction peak data. In the absence of oxygen adsorption, a relatively high coverage of the electrode surface is attained. A Langmuir-type adsorption is observed under the different experimental conditions.


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