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Issue 12, 2017
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Engineering hierarchical nanotrees with CuCo2O4 trunks and NiO branches for high-performance supercapacitors

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Abstract

Nanotrees consisting of CuCo2O4 trunks and NiO branches were hydrothermally grown on 3D nickel foam, they were then assembled into a supercapacitor which exhibits excellent performance, e.g. high specific capacitances of 2219 and 1405 F g−1 at current densities of 1 and 20 A g−1, respectively, and a long-term capacity retention of ∼95.3% after 10 000 cycles at a high current density of 20 A g−1. Such values are the highest among similar core/shell-structured metal oxide electrodes reported in the literature. Many factors are identified to be responsible for the observations: the highly conductive 3D Ni foam substrate that totally eliminates binders and conductive additives; highly crystalline CuCo2O4 trunks are directly grown on the conductive current collector, allowing fast electron transport; and the mesoporous NiO branches with a huge surface area facilitate fast ion diffusion and intimate electrode/electrolyte contact. In addition, the trunks and branches have redox reactions with anions and cations, respectively, from the electrolyte, both reactions contribute much to electrochemical charge storage.

Graphical abstract: Engineering hierarchical nanotrees with CuCo2O4 trunks and NiO branches for high-performance supercapacitors

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Publication details

The article was received on 16 Jan 2017, accepted on 20 Feb 2017, published on 20 Feb 2017 and first published online on 20 Feb 2017


Article type: Paper
DOI: 10.1039/C7TA00506G
Citation: J. Mater. Chem. A, 2017,5, 5820-5828
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    Engineering hierarchical nanotrees with CuCo2O4 trunks and NiO branches for high-performance supercapacitors

    K. Qiu, M. Lu, Y. Luo and X. Du, J. Mater. Chem. A, 2017, 5, 5820
    DOI: 10.1039/C7TA00506G

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