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Electrochemical properties and mechanism characterizations for PIBs. (A) Cycling performance at 100 mA g−1, (B) rate capabilities, and (C) cycling performance at 1,000 mA g–1. Notes: The capacities were all calculated based on the total weight of the electrodes. (D) Ex situ XPS results of the C 1 s spectrum during the potassiation and de-potassiation process. (E) Corresponding discharging and charging curves and (F) in situ FT-IR contour map for the Co-COF@CNT electrode.
