“…In this context, different metallic electrocatalysts have been studied for CO 2 RR, ranging from Cu (it seems to be the unique metal selective for hydrocarbons and alcohols formation) [32,33] to Au, Ag, Zn (mainly producing CO) [34][35][36] and Pb, In, Sn, Bi (formate/formic acid generation). [13,[37][38][39] Nonetheless, there are still many challenges to be addressed to reduce the overpotential and control the selectivity of CO 2 RR on metallic electrocatalysts [40]. The main key parameters that need to be studied to improve both activity and selectivity are, among others, operating conditions (applied voltage, current density, catalyst loading, etc.)…”