Metalloporphyrin doped macroporous ZIF-8 metal-organic framework derived M-Nx carbon material for oxygen reduction reactions
Source abstract
Abstract
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 reduction catalysts (M-N x /OMC; M = Fe, Co, and Mn) were prepared by loading metalloporphyrins and carbonization. Among the catalysts prepared, Fe-N x /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-N x/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.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Fuel Cells and Related Materials · Advanced battery technologies research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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