It has recently been demonstrated that the potentiodynamic behaviour of Rh/H2SO4(aq) interphases in the potential range of the thermodynamic stability of bulk water is associated with at least two-well defined and different electrochemical characteristics of rhodium, which were referred to as Aand B-type Rh electrodes. The aim of the present report is to show the electrocatalytic difference of A- and B-type electrodes for the 02 evolution reaction, on the basis that the corresponding structures of the electrodes remain stable during the time the electrochemical measurements last.