An intercalation-carbonization technique was utilized to design and synthesize sandwich-type MoO3/C hybrid nanostructures for high-performance asymmetric supercapacitor.
Hierarchically porous holey graphene/PANI/ graphene nanohybrid is fabricated by adopting a facile twostep process in which PANI/graphene hybrid was first synthesized hydrothermally and then wrapped with a layer of holey graphene. The resulted sandwich-like structure cannot only promote electronic transmission and ionic diffusion, but also contribute to a prominent rate capability. A symmetric supercapacitor was assembled with the obtained holey graphene/PANI/graphene nanohybrid, exhibiting a maximum specific capacitance of 437 F•g −1 at 1 A•g −1 , an energy density of 55 Wh•kg −1 at 900 W•kg −1 , an ultrahigh-rate performance (retained 43% capacitance at 100 A•g −1 ), as well as a long-term life (84% retention after 5000 loops at 10 A•g −1 ). The present work may provide an insight for designing highperformance symmetric supercapacitor.
A one-step strategy for the construction of a nanotube/nanosheet integrated hierarchical architecture (Fe–N–C), as an efficient ORR electrocatalyst and MFC electrode material.
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