The optimization of iron porphyrin@MOF-5 derived Fe-N-C electrocatalysts for oxygen reduction reaction in zinc-air batteries

作者：Guo, Xiao-Shuang; Huang, Zhen-Yu; Qi, Xiao-Wen; Si, Li -Ping^*; Zhang, Hao; Liu, Hai -Yang^*

来源：Journal of Electroanalytical Chemistry, 2023, 936: 117381.

DOI：10.1016/j.jelechem.2023.117381

• Metal -organic framework
• Iron porphyrin
• Fe -N -C electrocatalyst
• Oxygen reduction reaction
• Zinc air battery

The development of non-precious metal catalysts (NPMC) for oxygen reduction reactions (ORR) is a hot topic for fuel cells and zinc-air batteries (ZABs). This study reports a method to obtain efficient Fe-N-C ORR cat-alysts via doping dicyandiamide and iron porphyrins on the pyrolyzed MOF-5 and followed pyrolysis to achieve the anchoring of Fe-Nx active sites onto square-shaped structure carbon material. The prepared Fe-N-C catalysts exhibit excellent ORR performance under an alkaline environment with half-wave potentials up to 0.903 V, which is 57 mV higher than that of Pt/C under the same conditions. It has excellent stability and methanol resistance. Moreover, this catalyst exhibited high specific capacity (821.8 mAh g-1) and power den-sity (111.7 mW cm-2) in assembled ZAB, and excellent charging and discharging stability.

• 单位
  佛山科学技术学院