fig3

From: Two-dimensional nitrogen and phosphorus co-doped mesoporous carbon-graphene nanosheets anode for high-performance potassium-ion capacitor

Two-dimensional nitrogen and phosphorus <InlineParagraph>co-doped</InlineParagraph> mesoporous carbon-graphene nanosheets anode for high-performance potassium-ion capacitor

Figure 3. K⁺ storage behaviour of N/P-MC@RGO anode in half cells. (A) Initial charge/discharge curves at a rate of 0.05 A g^-1. (B) Galvanostatic charging/discharging curves at different rates. (C) Rate capability achieved from 0.05-5.00 A g^-1. (D) CV patterns ranging from 0.2-10 mV s^-1. (E) b-value evaluated from the anodic peak currents. (F) Voltammetry response for N/P-MC@RGO electrode at 5 mV s^-1. The shaded region is related to the capacitive contribution to the total current. (G) GITT test on N/P-MC@RGO anode. (H) The K⁺ diffusion coefficient evaluated by GITT method during the different charge/discharge processes.