Design and Fabrication of Petal-Like NiCo2O4@NiMoO4 Core/Shell Nanosheet Arrys Electrode for Asymmetric Supercapacitors. Issue 2 (1st January 2017)

• Record Type: Journal Article
• Authors: Xue, Wei-Dong; Yin, Huan; Wang, Wen-Jian; Zhao, Rui
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 2(2017)
• Page Start: A482
• Page End: A489
• Publication Date: 2017-01-01
• Subjects: core/shell nanosheet arrays -- electrode materials -- NiCo2O4@NiMoO4 -- supercapacitor; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1471702jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The integrated design and fabrication of novel petal-like NiCo2 O4 @NiMoO4 core/shell nanosheet arrys electrode through two-step different hydrothermal and annealing process, the unique core-shell structure is beneficial to the diffusion of ion and the transport of charge, furthermore, the integrated structure electrode fully utilizes the synergistic effect of NiCo2 O4 as a core material and NiMoO4 as a shell material and exhibits excellent electrochemical performance. The optimized NiCo2 O4 @NiMoO4 electrode (4h) delivers 6.91 F cm −2 and 1974 F g −1 at 5 mA cm −2, the capacitance maintains 76% after 5000 cycles at 40 mA cm −2, Moreover, an asymmetric supercapacitor was assembled by utilizing NiCo2 O4 @NiMoO4 electrode (4h) and activated carbon (AC) as the positive and negative electrodes, the viable operating voltage can expand to 1.6 V and energy density can reach 47 Wh kg −1 at the power density of 0.4 kW kg −1, the asymmetric supercapacitor shows outstanding cycling stability since the capacitance maintains 87% after 4000 cycles at 5 A g −1 . This prominent electrochemical performance mean NiCo2 O4 @NiMoO4 core/shell nanosheet arrays electrode will has a lot of potential applications in energy storage.