To prepare the electrodes, MWCNT (5 mg) was dispersed in DMF (2.34 mL) using a probe sonicator for 20 min. Then, 600 L of freshly made CoPcNH2 solution in DMF (1 mM) and of Nafion TM (60 L, 5 % v/v in lower aliphatic alcohols and water) were added to the dispersion. The mixture was sonicated for an additional 15 min. 100 L of this catalyst ink was then drop-casted over an activated graphite foil substrate (active area ~0.84 cm 2 ). The ink was allowed to dry for a minimum two days at room temperature. The fabricated catalyst is denoted as CoPcNH2@MWCNT and characterised by SEM, SEM-EDX, ICP-OES analysis.