Electrochemical experiments were performed using a GAMRY potentiostat (Interface 1010E) or a Biologic VSP-3e potentiostat. The set up consisted of a divided cell, separated by a porous glass frit. Potentials were measured vs Ag/AgCl/KCl (3M) reference electrode, using a nickel foam as working electrode and a platinum wire as counter electrode. All reported potentials were referenced against the Fc/Fc+ redox couple. The distance between anode and cathode was approximately of 5.4 cm. Each cell contained 25 mL of solution. ) and graphite bar (16 cm 2 ). The surfaces correspond to bulk submerged surfaces. Scheme S1 Second optimization, using a graphite bar as counter electrode, and EtOH or n-BuOH as solvents. Yield determined via 1 H NMR spectroscopy using an internal standard.