Figure 6 | Scientific Reports

Figure 6

From: Synthesis of hierarchical porous carbon scaffold derived from red kidney bean peels for advanced Li–Se and Na–Se batteries

Figure 6

Electrochemical performance measurements of Na–Se cells equipped with Se@ACRKB cathode. (a) CV curves of the cell during the first nine cycles, obtained at 0.1 mV s−1. (b) Rate capabilities of cell at various rates. (c) Charging and discharging curves of cell at 1C, illustrating the shapes of the 2nd, 3rd, 4th, and 40th cycles, respectively. (d) Cycle stability of Na–Se battery at 1 C and 0.1 C for 200 cycles. (e) Nyquist plots of cell before cycling and after 100 cycles; and (f) Z′ versus W−1/2 in the low-frequency range.

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