fig3

From: N/S co-doping design promising coal pitch derived carbon nanofibers toward advanced all-carbon potassium ion hybrid capacitors

Figure 3. (A) Typical dQ/dV plots of N/S-CNF-700 and CNF-700 obtained from the 3rd charge-discharge cycle; (B) GCD plots before (the upper) and after pre-potassium (the lower) of N/S-CNF-700 at 0.1 A g^-1; (C) Rate capacities; (D) Rate capability of N/S-CNF-700 and comparison with latest reported carbon-based anodes^[3,20,50-56]; (E) Cycling properties of N/S-CNFs anodes at 1.0 A g^-1; (F) CV curve (1.7 mV s^-1) with pseudo-capacitive contribution (red region) of N/S-CNF-700; (G) GITT profiles and corresponding D_K+ values of N/S-CNF anodes over charge-discharge processes. N/S-CNFs: N/S co-doped carbon nanofibers; GCD: galvanostatic charge-discharge tests; CV: cyclic voltammetry; GITT: galvanostatic intermittent titration technique.