Zinc–air batteries are recognized for their environmental friendliness and high energy density; however, the slow kinetics of the oxygen reduction reaction (ORR) at the air electrode hinder their commercial viability. The research focuses on synthesizing cubic hollow carbon structures derived from Metal–Organic Frameworks (MOFs), which enhance catalytic performance through improved conductivity and mass transfer. The resulting Fe/Fe₃C/HCNB catalyst demonstrates a half-wave potential of 0.826 V for ORR and achieves a peak power density of 274 mW cm⁻² in zinc–air batteries, surpassing commercial Pt/C catalysts. Electrochemical impedance spectroscopy reveals that the hollow structure enhances hydrophilicity and reduces solution resistance, facilitating greater active site engagement in electrochemical reactions. The study concludes that the unique structural features of Fe/Fe₃C/HCNB significantly improve discharge performance and stability, positioning it as a promising alternative for zinc–air battery applications.

中文翻译：

---

Fe/Fe3C 颗粒封装在空心碳纳米盒中，用于高性能锌空气电池


锌空气电池以其环保和高能量密度而著称;然而，空气电极上氧还原反应 （ORR） 的缓慢动力学阻碍了它们的商业可行性。研究重点是合成源自金属有机框架 （MOF） 的立方空心碳结构，通过提高电导率和传质来提高催化性能。所得的 Fe/Fe₃C/HCNB 催化剂的 ORR 半波电位为 0.826 V，在锌空气电池中实现了 274 mW ^cm-2 的峰值功率密度，超过了商用 Pt/C 催化剂。电化学阻抗谱显示，中空结构增强了亲水性并降低了溶液阻力，从而促进了电化学反应中更活跃的位点参与。该研究得出结论，Fe/Fe₃C/HCNB 的独特结构特征显著提高了放电性能和稳定性，使其成为锌-空气电池应用的有前途的替代品。