Electrochemical Conversion of CO2 to CO by a Competent FeIIntermediate Bearing a Schiff Base Ligand

Iron complexes with a N2O2-typeN,N '-bis(salicylaldehyde)-1,2-phenylenediaminesalophen ligand catalyze the electrochemical reduction of CO(2)to CO in acetonitrile with phenol as the proton donor, giving rise to 90-99 % selectivity, faradaic efficiency up to 58 %, and turnover frequency up to 10(3) s(-1)at an overpotential of 0.65 V. This novel class of molecular catalyst for CO(2)reduction operate through a mononuclear Fe(I)intermediate, with phenol being involved in the process with first-order kinetics. The molecular nature of the catalyst and the low cost, easy synthesis and functionalization of the salophen ligand paves the way for catalyst engineering and optimization. Competitive electrodeposition of the coordination complex at the electrode surface results in the formation of iron-based nanoparticles, which are active towards heterogeneous electrocatalytic processes mainly leading to proton reduction to hydrogen (faradaic efficiency up to 80 %) but also to the direct reduction of CO(2)to methane with a faradaic efficiency of 1-2 %.