give the cell representation of bromide electrode
Answers
A cyclic voltammetric study of the behaviour of Br– and Br– 3 at Pt electrodes, in the potential range between hydrogen and oxygen evolution, is described. Different experiments were carried out, in the presence of Br– and Br– 3, 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 and mol dm–3, at constant ionic strength, in 1 M HclO4 as well as in 1 M NaClO4 adjusted to a pH of 2. Underpotential deposition of Br is observed at potentials as low as –0.125 V 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.
