Figure 6.

Electrochemical characteristics of the solid-state SRAC5/Ni//SRAC5/Ni supercapacitor: (a) CV curves at various scan rates within a voltage window of 2 V; (b) GCD curves at various current densities; (c) the gravimetric capacitance as a function of current density; (d) cycling performance at a current density of 2 A g⁻¹ (inset: the charge–discharge curves of the first and last 5 cycles); (e) Nyquist plots of the initial and after 5000 cycles; and (f) Ragone plots comparison of the SRAC5/Ni//SRAC5/Ni SSC versus previously reported soybean-based SSC devices.