Fig. 5
Supercapacitive performance of H@TNAs-1. a CV curves collected at various scan rates ranging from 10 to 500 mV s−1. b Galvanostatic charge/discharge curves at various current densities ranging from 0.025 to 0.5 mA cm−2, inset is the enlargement of the galvanostatic charge/discharge curves at higher current densities. c Nyquist plots collected at a frequency from 100 kHz to 10 mHz, with inset showing an enlargement of the high-frequency regions and a fitting equivalent circuit. d Specific capacitance of H@TNAs-1 measured as a function of current density