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a) ORR polarization curves and b) the average electron transfer number (n) of CNT, N‐CNT, D‐UGNR, DN‐UGNR, and Pt/C catalysts. c) OER polarization curves for CNT, N‐CNT, D‐UGNR, DN‐UGNR, and RuO2/C catalysts. d) The overall polarization curves of CNT, N‐CNT, D‐UGNR, and DN‐UGNR catalysts in the whole ORR and OER region.
