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Sandwich-type hybrid structure consisting of etched nitrogen-doped graphene paper (ENGP) and flower-like MnO2 are fabricated through a three-step method. The ENGP were synthesized by vacuum assisted flow-filtration of the dicyandiamide (DCD) and graphene oxide (GO) aqueous solution through filter membrane, followed by a carbonization process, and then by an electrochemical etching method to improve...
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