Controlled sulfidation of ternary transition metal towards high performance electrode materials for supercapacitors

Qing Pang; Hao Wu; Tengfei Wang; Boyu Liu; Hongyu Wang; Qing Pang; Hao Wu; Tengfei Wang; Boyu Liu; Hongyu Wang

doi:10.48130/een-0026-0015

Figure 1.

(a) Preparation process diagram of NCF-S, SAED pattern images of (b) NCF-OH and (c) NCF-S₃₅, and TEM images of (d) NCF-S₅₅, (e) NCF-S₇₅, (f) NCF-S₉₅, and (g) NCF-S₁₁₅.

Figure 2.

SEM images of (a) NCF-OH, (b) NCF-S₃₅, (c) NCF-S₅₅, (d) NCF-S₇₅, (e) NCF-S₉₅, (f) NCF-S₁₁₅, and (g) EDS of NCF-S₉₅.

Figure 3.

(a) XRD pattern, (b) full spectrum, high-resolution spectra of (c) Co 2p, (d) Ni 2p, (e) Fe 2p, and (f) S 2p.

Figure 4.

(a) CV curves of different electrodes; (b) CV curves of NCF-S₉₅; (c) GCD curves; (d) GCD curves of NCF-S₉₅; (e) EIS curves; (f) cycle performance diagram; (g) b-value determination; (h) CV curve (shaded region) at 1 mV s⁻¹ illustrating the capacitive and diffusion contributions. (i) Corresponding bar diagram for capacitive/diffusion contribution ratios of NCF-S₉₅.

Figure 5.

(a) CV curves of NCF-S₉₅ and AC; (b) CV curves in different potential windows; (c) CV curves at different scan rates; (d) EIS curve; (e) GCD curves; (f) cyclic stability; (g) electrochemical performance comparison diagram; (h) performance advantage diagram of NCF-S₉₅//AC.