Developing non-noble oxygen electrocatalyst is of great importance in multiple energy conversion and storage technologies, for instance, metal-air battery, fuel cell and water electrolysis. Here, we report a bifunctional oxygen electrocatalyst derived from Ni–Fe dual-metal zeolitic imidazole frameworks, Ni₃Fe nanoalloys embedded in N-doped carbon (Ni₃Fe/N–C) containing carbon nanotube and porous carbon, which exhibits superior oxygen reduction and evolution reaction electrocatalytic performance. For oxygen reduction reaction, the onset potential and the half-wave potential of Ni₃Fe/N–C are 0.92 V and 0.85 V, respectively, which are well consistent with those of commercial Pt/C. For oxygen evolution reaction, a low overpotential of 330 mV at 10 mA cm⁻² is obtained for Ni₃Fe/N–C, prominently better than that of commercial RuO₂/C. Moreover, the oxygen reduction and evolution stability of Ni₃Fe/N–C distinctly overmatches that of commercial Pt/C and RuO₂/C. Benefiting from the favorable electrocatalytic activity and stability, the rechargeable Zn–air battery based on Ni₃Fe/N–C exhibits smaller voltage gap (∼0.8 V) than the one based on commercial Pt/C and RuO₂/C, and remarkable stability during 300-cycle discharge-charge test. The excellent performance can be attributed to the interaction between Ni₃Fe nanoalloy and N-doped carbon, the unique nanostructure composed of carbon nanotube and porous carbons, and high graphitization degree.

在金属-空气电池，燃料电池和水电解等多种能量转换和存储技术中，开发非贵金属氧电催化剂至关重要。在这里，我们报道了一种由Ni-Fe双金属沸石咪唑骨架，嵌入含碳纳米管和多孔碳的N掺杂碳（Ni ₃ Fe / N–C）中嵌入的Ni ₃ Fe纳米合金构成的双功能氧电催化剂，该碳表现出优异的氧还原和放出反应的电催化性能。对于氧还原反应，Ni ₃ Fe / N-C的起始电势和半波电势分别为0.92 V和0.85 V，与商业化的Pt / C一致。对于氧气释放反应，在10 mA cm处的低过电位为330 mVNi ₃ Fe / N–C的含量为⁻²，明显优于商业RuO ₂ / C的含量。此外，Ni ₃ Fe / N–C的氧还原和析出稳定性明显超过了商用Pt / C和RuO ₂ / C。受益于良好的电催化活性和稳定性，基于Ni ₃ Fe / N–C的可充电Zn-空气电池的电压间隙（〜0.8 V）比基于商用Pt / C和RuO ₂ / C的电池更小，并且具有显着的优势。在300次循环充放电测试中保持稳定。优异的性能归因于Ni ₃之间的相互作用Fe纳米合金和N掺杂碳，由碳纳米管和多孔碳组成的独特纳米结构，石墨化度高。