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Zn-Ni-Co trimetallic carbonate hydroxide nanothorns branched on Cu(OH)2 nanorods array based on Cu foam for high-performance asymmetric supercapacitors

journal contribution
posted on 2019-10-15, 00:00 authored by Y Liu, X Cao, L Cui, Y Zhong, R Zheng, D Wei, Colin BarrowColin Barrow, Joselito RazalJoselito Razal, Wenrong YangWenrong Yang, J Liu
Here we report the development of a high-performance electrode material composed of Zn and Ni co-substituted Co carbonate hydroxide (ZnNi-Co2(CO3)(OH)2) nanothorns branched on Cu(OH)2 nanorods array (Cu(OH)2@ZnNi-Co2(CO3)(OH)2), which are grown directly on copper foam current collector. The electrode materials are obtained by a simple in situ oxidation reaction and a hydrothermal strategy. The as-obtained Cu(OH)2@ZnNi-Co2(CO3)(OH)2 electrode exhibits significantly enhanced electrochemical performance with a high specific capacitance (2746 F g−1 at 1 A g−1), and extraordinary cycling stability (maintained 95.61% of the initial capacitance after 6000 cycles at 20 A g−1), which are much superior to those of Cu(OH)2, Cu(OH)2@ Co2(CO3)(OH)2, Cu(OH)2@Ni-Co2(CO3)(OH)2, and bare ZnNi-Co2(CO3)(OH)2 nanospheres electrodes. Additionally, the Cu(OH)2@ZnNi-Co2(CO3)(OH)2 nanorods array can also be utilized as the positive electrode to fabricate an asymmetric supercapacitor device with an active carbon negative electrode, realizing a high cell voltage of 1.5 V and the energy density of up to 34.75Wh kg−1 at a power density of 375 W kg−1. The excellent electrochemical properties can be credited to the three-dimensional hierarchical core-shell architecture.

History

Journal

Journal of power sources

Volume

437

Article number

226897

Pagination

1 - 9

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0378-7753

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2019, Elsevier B.V.