Title: Growth of NiCo₂O₄ nanotubes @MnO₂ sheet core-shell arrays on 3D hierarchical porous carbon aerogels as superior electrodes for supercapacitors

Authors: H-L. Fan; J. Zhang; W. Ju; B-X. Liu; X-F. Zhao; X-C. Liu; X-B. Yi

Addresses: Advanced Materials Institute Shandong Academy of Sciences, Jinan, Shandong 250014, China ' Advanced Materials Institute Shandong Academy of Sciences, Jinan, Shandong 250014, China ' Advanced Materials Institute Shandong Academy of Sciences, Jinan, Shandong 250014, China ' Advanced Materials Institute Shandong Academy of Sciences, Jinan, Shandong 250014, China ' Advanced Materials Institute Shandong Academy of Sciences, Jinan, Shandong 250014, China ' Advanced Materials Institute Shandong Academy of Sciences, Jinan, Shandong 250014, China ' Advanced Materials Institute Shandong Academy of Sciences, Jinan, Shandong 250014, China; Shandong Key Laboratory for Special Silicon-containing Material, Jinan, Shandong 250014, China

Abstract: The hierarchical of NiCo₂O₄@MnO₂ core-shell nanotubes arrays anchored on 3D hierarchical porous carbon aerogels scaffold (NiCo₂O₄@MnO₂-CAS) are prepared through a facile hydrothermal method combined with a simple thermal treatment. Such unique array nanoarchitectures and the synergistic effects of component nanomaterials exhibit remarkable electrochemical performance. The results show high specific capacitance of 786.0 F/g at current densities of 0.5 A/g, excellent rate performance and good cycling stability with capacitance retention of 84.9% after 2,000 cycles. An asymmetric supercapacitor with operating potential at 1.4 V is configured with NiCo₂O₄@MnO₂ composites against active carbon, and exhibits a specific capacitance of 145.0 F/g at current density of 1.0 A/g and a high energy density of 39.0 Wh/kg at a power density of 350.0 W/kg.

Keywords: carbon aerogels; NiCo₂O₄@MnO₂ composites; synergistic effect supercapacitors.

DOI: 10.1504/IJNM.2019.097242

International Journal of Nanomanufacturing, 2019 Vol.15 No.1/2, pp.92 - 104

Received: 23 Apr 2017
Accepted: 26 Oct 2017
Published online: 07 Jan 2019 *

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