Issue 47, 2018

Ultrathin CoFe-layered double hydroxide nanosheets embedded in high conductance Cu3N nanowire arrays with a 3D core–shell architecture for ultrahigh capacitance supercapacitors

Abstract

Ultrathin layered double hydroxide (LDH) nanosheets are a promising candidate as the electrode material for energy storage due to the ultrafast mass diffusion and greater specific surface area. As a kind of emerging electrode material, metal nitride plays a vital role in improving the poor conductivity of most supercapacitors. Herein, we design a novel three-dimensional (3D) embedded hierarchical core–shell nanostructure by combining ultrathin CoFe-LDH nanosheets (∼2.5 nm) with porous Cu3N nanowire arrays (NWAs), in which the ultrathin CoFe-LDH nanosheets are grown from the interior of Cu3N nanowire cores supported on Cu foam (denoted as Cu3N@CoFe-LDH). The prepared Cu3N@CoFe-LDH NWA electrode exhibits a high areal capacitance of 3078 mF cm−2 at a current density of 1 mA cm−2, excellent rate capacity (85.8% capacity retention at 20 mA cm−2) and superior cycling stability (93.9% retention after 10 000 cycles), making it significantly superior to the related CuO@CoFe-LDH NWA electrodes. Additionally, the constructed asymmetric supercapacitor (ASC) devices deliver an ultrahigh energy density of 2.474 mWh cm−3 and a robust cycling stability (92.6% retention after 10 000 cycles). The outstanding electrochemical performance can be credited to the significant enhancement of the specific surface area, charge transport, and mechanical stability by the ultrathin LDH shell, the highly conductive Cu3N core, and the distinctive embedded core–shell nanostructure.

Graphical abstract: Ultrathin CoFe-layered double hydroxide nanosheets embedded in high conductance Cu3N nanowire arrays with a 3D core–shell architecture for ultrahigh capacitance supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
29 9月 2018
Accepted
15 11月 2018
First published
19 11月 2018

J. Mater. Chem. A, 2018,6, 24603-24613

Ultrathin CoFe-layered double hydroxide nanosheets embedded in high conductance Cu3N nanowire arrays with a 3D core–shell architecture for ultrahigh capacitance supercapacitors

X. Zhou, X. Li, D. Chen, D. Zhao and X. Huang, J. Mater. Chem. A, 2018, 6, 24603 DOI: 10.1039/C8TA09442J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements