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One-pot synthesis of mixed-valence manganese oxide (MnO_x)/potassium ion-doped reduced graphene oxide (rGO) composites for efficient electrochemical supercapacitors is introduced. Using manganese nitrate and potassium permanganate as co-precursors for the MnO_x and by directly annealing the rGO without tedious purification steps, as described herein, MnO_x/rGO composites with a high specific capacitance of 1955.6 F g^−1 at a current density of 1 A g^−1 are achieved. It is found that the presence of potassium ions helps in the development of mixed-valence MnO_x on the surface of the rGO.