Electrochemical Activity in  KOH  Electrolyte of Carbon‐Based Air Electrodes Containing Polymeric Iron Phthalocyanine by Direct Synthesis Methods

Polymeric iron phthalocyanine (poly‐FePc) was synthesized directly onto carbon supports, and carbon‐based electrodes were fabricated using the carbon supports. Three synthesis methods, melt, liquid‐phase, and gas‐phase, were studied. Then activity on reduction in solution was compared among three electrodes. The electrode obtained by melt synthesis showed the lowest polarization and maintained the most positive potential at a 10 mA/cm² discharge. The activity of poly‐FePc was in the order: melt > liquid‐phase > gas‐phase synthesis methods. Comparing the activity of poly‐FePc for the melt synthesis electrode with that for the electrode‐impregnated poly‐FePc from poly‐FePc/conc. solution, the former showed a lower polarization and a smaller potential drop for a 10 mA/cm² discharge.