Fig. 5

The electrochemical performance of the Se-R800A cathode in Na-Se batteries, a the CV curves at scan rate of 0.2 mV s⁻¹, b the galvanostatic discharge/charge voltage profiles tested at 50 mA g⁻¹, c the cycling performance of the Se-R800A, R800A, and R800 at 100 mA g⁻¹, d the rate capability at various current densities, and e the cycling performance of the Se-R800A at 2 A g⁻¹