Figure 6

Long term cycling performances of electrodes at a current rate of 1 C (a) discharge; (c) charge; Galvanostatic discharge/charge curves of electrodes at different cycles (b) P-TiO₂; (d) H–N-TiO₂; (e) Coulombic efficiencies for long cycling performances of P-TiO₂ and H–N-TiO₂.