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Charge–discharge cycles for (a) pure TiO2, (b) 3% Cu-doped TiO2, and (c) 7% Cu-doped TiO2. (d) Comparative charge–discharge curves of the second cycle for all nanopowder materials in the potential range of 0.01–3 V vs Li/Li+ for an applied scan rate of 0.05 A g–1.
