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(a) CV curves of annealed N-TiO2 anodes at different sweep rates. (b) Correlation between log (ip) and log (v) values for N-TiO2 that has been annealed. (c) b values of annealed N-TiO2 at different potentials. (d) The plot of i/v1/2–v1/2 of the annealed N-TiO2. (e) Proportion of capacitance behavior (gray) and diffusion-controlled behavior (green) of annealed N-TiO2 at a sweep rate of 20 mV s−1. (f) The capacitance contribution of the annealed N-TiO2 at 20–110 mV s−1.
