A correlation between the changes in total charge and open circuit potential of a hydrogen electrode during the adsorption of neutral particles and the formation of adatoms from ions

Analytical descriptions are given for the charges passed through the hydrog en electrode (at E-ads = const) and the shifts of its open circuit potentia l, which are observed during the strong adsorption of neutral particles and ions with the formation of adatoms. The integral values of transients of c urrent and those of open circuit potential are explained by using the conce pt of electrode total charge. The interrelation between transients of curre nt and open circuit potential is analyzed. To check experimentally the rela tionships obtained, the adsorption measurements on a platinum electrode in solutions of iodine and iodide anions are mainly used (0.5 M H2SO4 as the s upporting electrolyte). The theoretical conclusions are shown to be in adeq uate agreement with the experimental results. (C) 2001 Elsevier Science B.V . All rights reserved.