The electrochemical data reported in the literature on Rh electrodes is relatively scarce as compared to other noble metals such as Pt and Au[l-63]. Correspondingly, there are no unquestionable reference single crystal (SC) Rh systems available for establishing a direct correlation between the voltammetric response and the type of crystallographic face as for Pt and to some extent also for Au. [Extracto a modo de resumen]