Experimental check-up of the relationship between transients of current and open circuit potential for strong adsorption of neutral species and ions on a hydrogen electrode

Transients of current and open circuit potential are measured during carbon monoxide adsorption on Pt/Pt, Rh/Pt, and Ir/Pt electrodes from sulfuric acid and hydrochloric acid solutions, as well as during the adsorption of iodine and iodide ions on Pd/Pt from sulfuric acid solutions. The integral values of transients are shown to agree with those expected theoretically. The possibility of estimating open circuit potential transients based on the data on current transients is analyzed. A combination of transient measurements with other adsorption methods makes it possible to show that in a number of systems the electrode surface is recharged as a result of formation of adsorbed monolayers and to reveal differences in the nature of adlayers formed in solutions of I2 and I−.