Abstract
Graphene/Mn3O4 composites were synthesized by a facile flash irradiation method at room temperature. The flash irradiating triggers the deoxygenation reaction of graphene oxide and the decomposition reaction of manganese nitrate. Additionally, the graphene/Mn3O4 positive electrodes showed a wide operating potential of 0–1.2 V (vs SCE) in aqueous electrolyte for supercapacitors. The extended potential windows further expand the stable cell voltage (2.2 V) for aqueous asymmetric supercapacitors with a high energy density of 18.5 Wh kg−1 at power density of 0.28 kW kg−1.
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