The present work reports a number of preliminary electrochemical experiments performed on polycrystalline Pt(pc) electrodes in acid solution by using an electrochemical flow cell technique and adequately selected combined potential routines. From these results the voltammetric behaviour of different coadsorbates as well as the participation of competitive adsorption in several electrochemical surface reactions can be observed.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas