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Cyclic voltammograms for the first to fifth cycles for the TiO2 nanopowder in the potential range of 0.01–3 V vs Li/Li+ for an applied scan rate of 0.3 mV s–1 for (a) pure TiO2, (b) 3% Cu-doped TiO2, and (c) 7% Cu-doped TiO2 and (d) comparative cyclic voltammogram curves of the second cycle of each electrode material.
