Metalloporphyrin doped macroporous ZIF-8 metal-organic framework derived M-Nx carbon material for oxygen reduction reactions

作者：Huang, Zhen-Yu; Guo, Xiao-Shuang; Tang, Yan; Ye, Jian-Shan; Liu, Hai-Yang^*; Xiao, Xin-Yan^*

来源：Journal of Alloys and Compounds, 2023, 947: 169441.

DOI：10.1016/j.jallcom.2023.169441

• Carbon materials
• Ordered macroporous structure
• Metal-organic framework
• Zinc-air battery

The development of effective transition metal oxygen reduction reaction (ORR) catalysts performing well in alkaline environments remains challenging. In this study, ordered macroporous ZIF-8 @C supports were prepared via carbonization using polystyrene microspheres as templates, and transition metal oxygen re-duction catalysts (M-Nx/OMC; M = Fe, Co, and Mn) were prepared by loading metalloporphyrins and car-bonization. Among the catalysts prepared, Fe-Nx/OMC exhibited excellent electrocatalytic activity under alkaline conditions, the half-wave (0.911 V) and initial (0.960 V) potentials are 80 and 60 mV higher than that of Pt/C respectively. In addition, the specific capacity of the zinc-air battery (ZAB) catalyzed by Fe-Nx/ OMC reached 751 mAh g-1, which is 84 mAh g-1 higher than that of the ZAB catalyzed by Pt/C. The superior catalytic ORR activity is attributed to the hierarchical porous structure, which may have more exposed active centers in the carbon materials and improved mass-transfer efficiency. This study offers a new method for preparing high-performance carbon-based metal-organic framework electrocatalysts.