fig5

Figure 5. Electrochemical analysis of Meso/Micro-FeNC and FeNC. (A) In-situ EIS of Meso/Micro-FeNC at different charge-discharge potentials in a ZAB; (B) The corresponding test potentials for in-situ EIS on the initial charge-discharge curves of the ZAB; (C) DRT plot of Meso/Micro-FeNC obtained by deconvolving the in-situ EIS during charge processes; (D) The enlarged view of the IF peak of the charge DRT; (E) DRT plot of Meso/Micro-FeNC obtained by deconvolving the in-situ EIS during discharge processes; (F) The enlarged view of the IF peak of the discharge DRT. Meso/Micro-FeNC: Meso/microporous Fe/N-codoped carbon; ZABs: zinc-air batteries; EIS: electrochemical impedance spectroscopy; DRT: distribution of relaxation time; IF: intermediate-frequency.