Fig. 3From: Modulating the electrocatalytic activity of N-doped carbon frameworks via coupling with dual metals for Zn–air batteriesChemical structure of MnCo-NCF. a N1s, b Co2p, and c Mn2p XPS spectra of MnCo-NCF. d N1s, e Co2p, and f Mn2p XPS spectra of Co-NCF after annealingBack to article page