Cobalt-iron(II,III) oxide hybrid catalysis with enhanced catalytic activities for oxygen reduction in anion exchange membrane fuel cell

(Graph Presented) Carbon-supported cobalt-iron(II,III) oxide (Co-Fe₃O₄) hybrid nanoparticles (Co-Fe₃O₄/C) are prepared as efficient catalysis of the oxygen reduction reaction (ORR) in alkaline media and in the cathode of the anion exchange membrane fuel cell (AEMFC). The ORR activity of Co-Fe₃O₄/C gives an electron transfer number of 3.99, revealing almost perfect four-electron transfer, over a very wide range of potentials of 0.1 -0.8 V. Co-Fe₃O4/_C is more durable than Pt/C in alkaline media, undergoing almost no degradation in 10,000 s at 0.76 V (vs. RHE). The potential-cycling method shows that the rate of decline of Co-Fe₃O₄/C is only 5% decay after 10,000 cycles. The AEMFC using Co-Fe₃O₄/C also shows good performance and excellent durability in this study.