The impact of pore structure on the two-electron oxygen reduction reaction (ORR) in nitrogen-doped carbon materials is currently under debate, and previous studies are mainly limited to the rotating ring-disk electrode (RRDE) rather than the practical flow cell (FC) system. In this study, assisted by a group of reliable pore models, the impact of two pore structure parameters, that is, Brunauer-Emmett-Teller surface area (S ) and micropore surface fraction (f ), on ORR activity and selectivity are investigated in both RRDE and FC. The ORR mass activity correlates positively to the S in the RRDE and FC because a higher S can host more active sites. The H O selectivity is independent of f in the RRDE but correlates negatively to f in the FC. The inconsistency results from different states of the electrode in the RRDE and the FC. These insights will guide the design of carbon materials for H O synthesis.
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