Issue 7, 2018

Hierarchical 3D NiFe2O4@MnO2 core–shell nanosheet arrays on Ni foam for high-performance asymmetric supercapacitors

Abstract

Hierarchical NiFe2O4@MnO2 core–shell nanosheet arrays (NSAs) were synthesized on Ni foam as an integrated electrode for supercapacitors, using a facile two-step hydrothermal method followed by calcination treatment. The NiFe2O4 nanosheets were designed as the core and ultrathin MnO2 nanoflakes as the shell, creating a unique three-dimensional (3D) hierarchical electrode on Ni foam. The composite electrode exhibited remarkable electrochemical performance with a high specific capacitance of 1391 F g−1 at a current density of 2 mA cm−2 and long cycling stability at a high current density of 10 mA cm−2 (only 11.4% loss after 3000 cycles). Additionally, an asymmetric supercapacitor (ASC) device was fabricated with a NiFe2O4@MnO2 composite as the positive electrode material and activated carbon (AC) as the negative one. The ASC device exhibited a high energy density (45.2 W h kg−1) at a power density of 174 W kg−1, and an excellent cycling stability over 3000 cycles with 92.5% capacitance retention. The remarkable electrochemical performance demonstrated its great potential as a promising candidate for high-performance supercapacitors.

Graphical abstract: Hierarchical 3D NiFe2O4@MnO2 core–shell nanosheet arrays on Ni foam for high-performance asymmetric supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
02 Nov 2017
Accepted
02 Jan 2018
First published
09 Jan 2018

Dalton Trans., 2018,47, 2266-2273

Hierarchical 3D NiFe2O4@MnO2 core–shell nanosheet arrays on Ni foam for high-performance asymmetric supercapacitors

X. Zhang, Z. Zhang, S. Sun, Q. Sun and X. Liu, Dalton Trans., 2018, 47, 2266 DOI: 10.1039/C7DT04127F

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