Fig. 8.

a CV curves of Zn/Co–N@PCNFs-800 in 0.1 M N₂-saturated and O₂-saturated KOH with a sweep rate of 50 mV s⁻¹. b LSV curves for Zn/Co–N@PCNFs-800 and 20 wt% Pt/C in 0.1-M O₂-saturated KOH electrolyte with a 10 mV s⁻¹ and a rotation rate of 1600 rpm. c LSV curves of Zn/Co–N@PCNFs-800 at different rotation speeds from 400 to 2500 rpm. d K–L plots of Zn/Co–N@PCNFs-800 at different potentials. e Chronoamperometric response of Zn/Co–N@PCNFs-800 and 20 wt% Pt/C in 0.1 M O₂-saturated KOH aqueous solution at 0.71 V versus RHE. f The durability test of Zn/Co–N@PCNFs-800 and 20 wt% Pt/C for methanol. The arrow indicates the introduction of 1 mL methanol