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(a) SEM image of MPCAs–Fe and (b) ORR polarization curves of Pt/C, MPCAs, MPCAs–Fe, and MPCPs–Fe catalysts at a rotation rate of 1600 rpm in O2-saturated 0.1 mol L−1 KOH solution at a scan rate of 10 mV s−1. (c) ORR polarization curves of MPCAs–Fe before and after 10,000 CV cycles. Reprinted with permission from [46]. Elsevier, Amsterdam, The Netherlands, 2021.
