Freestanding hierarchical nickel [email protected] graphene [email protected] aluminum layered double hydroxides nanoarrays assembled from well-aligned uniform nanosheets as binder-free electrode materials for high performance supercapacitors

Add time:07/27/2019    Source:sciencedirect.com

Herein, the hierarchical nickel [email protected] graphene [email protected] aluminum layered double hydroxides (NiMoO4@[email protected]) architecture assembled from well-aligned nanosheets is successfully constructed on Ni-foam through a three-step strategy. For the first time, ultrathin graphene nanosheets are introduced by a novel spraying process to avoid the stack. NiAl-LDHs is prepared via situ growth procedure in which NiAl-LDH self-assembles on the surface of graphene to prevent graphene from aggregating, resulting in an enlarged specific surface area. Electrochemical analysis manifests that NiMoO4@[email protected] yields exceptional specific capacitance (3396 Fg−1 at 1 Ag−1), favorable charge/discharge rate and approving long-term stability. Furthermore, the NiMoO4@[email protected]//AC device delivers superior specific capacitance (137.2 Fg−1 at 1 Ag−1), high energy density (48.7 Whkg−1) associated with pleasurable power output (7987 Wkg−1). Importantly, the well-aligned NiMoO4@[email protected] provides a prospective conception constructing hierarchical structural materials in the area of supercapacitor.

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