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Figure 5: Electrochemical performance. (a) CE of Cu, G, and G@POF electrodes at the current density of 1.0 mA cm−2 and the capacity of 1.0 mAh cm−2. (b) Corresponding voltage profiles of the , , and cycle and (c) average voltage hysteresis of the G and G@POF electrodes. (d) CE of Cu, G, and G@POF electrodes at the current density of 3.0 mA cm−2 and the capacity of 3.0 mAh cm−2.