Abstract:

A composite electrocatalyst cobalt-phthalocyanine loaded on carbon black VulcanXC-72(CoPc/C)was synthesized in one-step reaction through calcination, which could be used as the catalyst of air electrode. The product was characterized by XRD and IR techniques and shown to be CoPc/C composite with an average particle size of 30 nm. Its activity for oxygen reduction reaction(ORR) was evaluated by polarization curve and impedance spectrum in 6 mol/L KOH solution. With VulcanXC-72 pretreated in HNO3 as the carbon support, the CoPc/C calcinated at 600 ℃ exhibited the best catalytic activity. The polarization plots recorded at the electrode catalyzed with this product displyed an onset for ORR at -0.03 V（Hg/HgO）. The current density is 90×10-3 A/cm2 at -0.2 V in air.

Key words: fuel cells(AFC), cobalt-phthalocyanine(CoPc), oxygen reduction reaction(ORR)