The present work is aimed to demonstrate the differences on the electrochemical behaviour of pipe flow electrodes with different lengths. This work compares the CO2 cathodic kinetics, taking place on the surface of two turbulent flow systems: pipe flow electrodes of two different
lengths and a RCE, both systems are mounted in the same flow loop. It is demonstrated that the limiting current density measured on pipe flow electrodes, is dependent on the electrode length. It is also demonstrated that the limiting current density measured on the surface of a RCE, is equivalent to the limiting current density measured on a long pipe flow electrode, if the electrode length effect is taken into account. These results are of particular interest in the design and operation of pipe loop experiments.
Keywords: carbon dioxide, flow loop, electrode length, RCE, pipe flow