Development of efficient electrocatalysts for Zn-air batteries is vital for energy storage and conversion. The activities of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are essential for the Zn-air battery (ZAB) application. Here, we synthesized the hollow ball spinel structural of Pt/CoFe₂O₄-C, which exhibited high ORR performance, close to commercial Pt/C. Simultaneously, the OER performance of Pt/CoFe₂O₄-C was slight better than that of the commercial IrO₂. Thus, the prepared (wt:0.1) Pt/CoFe₂O₄-C was applied in the homemade ZABs, whose open circuit voltage was as1.483 V, approaching the performance of the mixture of the commercial Pt/C and IrO₂ (1.508 V). Moreover, the discharge/charge voltage gap for the sample was as low as 1.288 V at 50 mA cm⁻², outperforming the mixture of Pt/C and IrO₂ (1.51 V). Remarkably, the small voltage difference of Pt/CoFe₂O₄-C was shown as 0.401 V after 12 h Zn-air battery charge/discharge testing under 30 mA cm⁻².

锌空气电池高效电催化剂的开发对于能量存储和转换至关重要。氧还原反应（ORR）和放氧反应（OER）的活性对于锌空气电池（ZAB）的应用至关重要。在这里，我们合成了Pt / CoFe ₂ O ₄ -C的空心球尖晶石结构，该结构具有高ORR性能，接近于商用Pt / C。同时，Pt / CoFe ₂ O ₄ -C的OER性能略优于商用IrO ₂。因此，制备的（wt：0.1）Pt / CoFe ₂ O ₄-C用于自制ZAB，其开路电压为1.483 V，接近商用Pt / C和IrO ₂的混合物的性能（1.508 V）。此外，样品的放电/充电电压间隙在50mA cm ^-2下低至1.288V ，优于Pt / C和IrO ₂的混合物（1.51V）。值得注意的是，在30 mA cm ^-2下对Zn-空气电池进行12 h充放电测试后，Pt / CoFe ₂ O ₄ -C的小电压差显示为0.401V 。