Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA.
Nanoscale. 2018 Sep 20;10(36):16996-17001. doi: 10.1039/c8nr04627a.
A low-cost and scalable method has been developed to synthesize Fe-decorated N-rich carbon electrocatalysts for the oxygen reduction reaction (ORR) based on pyrolysis of metal carbonyls containing metal-organic frameworks (MOFs). Such a method simultaneously optimizes the Fe-related active sites and the porous structure of the catalysts. Accordingly, the best-performing Fe-NC-900-M catalyst shows excellent ORR activity with a half-wave potential of 0.91 V vs. RHE, exceeding that of the 40% Pt/C catalyst in alkaline media. Furthermore, the zinc-air batteries constructed with Fe-NC-900-M as the cathode catalyst exhibit high open-circuit voltage (1.5 V) and peak power density (271 mW cm-2), and outperform most zinc-air batteries with noble-metal free ORR catalysts.
一种基于金属有机骨架（MOFs）含金属羰基物热解的低成本、可扩展的方法已被开发出来，用于合成用于氧还原反应（ORR）的 Fe 修饰的富 N 碳电催化剂。该方法同时优化了与 Fe 相关的活性位点和催化剂的多孔结构。因此，性能最佳的 Fe-NC-900-M 催化剂在碱性介质中具有 0.91 V 对 RHE 的优异 ORR 活性，超过了 40% Pt/C 催化剂的半波电位。此外，以 Fe-NC-900-M 作为阴极催化剂构建的锌空气电池具有高开路电压（1.5 V）和峰值功率密度（271 mW cm-2），优于大多数具有非贵金属 ORR 催化剂的锌空气电池。
