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Performance of asymmetric AC/MnO2 device using MnO2/Ni as positive electrode and AC as negative electrode. (a) Charge-discharge curves of AC/PD(MnO2/Ni), AC/PS(MnO2/Ni), and AC/PS + PD(MnO2/Ni); and (b) cycling stability test of AC/PS + PD(MnO2/Ni) device.
