College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, China.
Chongqing Key Laboratory of Materials Surface & Interface Science, Chongqing University of Arts and Sciences, Chongqing, 402160, China.
Small. 2023 Jun;19(23):e2207675. doi: 10.1002/smll.202207675. Epub 2023 Mar 10.
The poor oxygen diffusion and sluggish oxygen reduction reaction (ORR) kinetics at multiphase interfaces in the cathode suppress the practical application of zinc-air batteries. Developing effective strategies to tackle the issue is of great significance for overcoming the performance bottleneck but remains challenging. Here, a multiscale hydrophobic surface is designed on the iron single-atom catalyst via a gas-phase fluorination-assisted method inspired by the structure of gas-trapping mastoids on lotus leaves. The hydrophobic Fe-FNC attains a higher peak power density of up to 226 mW cm , a long durability of up close to 140 h, and better cyclic durability of up to 300 cycles compared to the corresponding Pt/C-based Zn-air battery. Experiments and theoretical calculations indicate that the formed more triple-phase interfaces and exposed isolated Fe-N sites are proposed as the governing factors in boosting electrocatalytic ORR activity and remarkable cycling durability for Zn-air batteries.
多相界面处氧气扩散不良和氧气还原反应（ORR）动力学缓慢，抑制了锌空气电池的实际应用。开发有效的策略来解决这个问题对于克服性能瓶颈具有重要意义，但仍然具有挑战性。在此，受荷叶捕气mastoid 结构的启发，通过气相氟化辅助方法在铁单原子催化剂上设计了一种多尺度疏水面。与相应的基于 Pt/C 的锌空气电池相比，疏水性 Fe-FNC 达到了高达 226 mW cm 的更高峰值功率密度、接近 140 小时的长耐久性和更好的循环耐久性。实验和理论计算表明，形成更多的三相界面和暴露的孤立 Fe-N 位点被认为是提高电催化 ORR 活性和显著循环耐久性的控制因素。
