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(a) Rate properties and (b) GCD curves of tubular carbon material at various operating rates. (c) GCD curves during cycling at 50 mA g−1. (d) Cycling lifespan and (e) coulombic efficiency of tubular carbon material at an operating rate of 50 mA g−1. (f) CV curve of tubular carbon material recorded at a test rate of 0.1 mV s−1.
