Issue 18, 2017

High volumetric energy density annealed-MXene-nickel oxide/MXene asymmetric supercapacitor

Abstract

A Ti3C2Tx MXene electrode decorated with NiO nanosheets was synthesized by a facile and cost-effective hydrothermal method. The NiO nanosheets were grown and immobilized on the carbon-supported TiO2 layer which was derived from Ti3C2Tx-MXene during a thermal annealing process. An electrode based on the NiO-grown derived-TiO2/C-Ti3C2Tx-MXene nanocomposite (Ni-dMXNC) exhibited a remarkable maximum specific capacity of 92.0 mA h cm−3 at 1 A g−1 and 53.9 mA h cm−3 at 10 A g−1. Furthermore, an asymmetric supercapacitor (ASC) device composed of Ni-dMXNC as the positive electrode and Ti3C2Tx MXene as the negative electrode was demonstrated to be better with a high energy density of 1.04 × 10−2 W h cm−3 at a power density of 0.22 W cm−3, and cycling stability with 72.1% retention after 5000 cycles, compared to ASCs using previously reported Ti3C2Tx MXene materials. The enhanced capacitive performance is attributed to the newly formed high-surface-area multilayers of the Ni-dMXNC architecture, the active surface of NiO layer, and a favourable synergetic behaviour of the Ti3C2Tx MXene negative electrode.

Graphical abstract: High volumetric energy density annealed-MXene-nickel oxide/MXene asymmetric supercapacitor

Supplementary files

Article information

Article type
Paper
Submitted
07 12月 2016
Accepted
07 2月 2017
First published
10 2月 2017
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2017,7, 11000-11011

High volumetric energy density annealed-MXene-nickel oxide/MXene asymmetric supercapacitor

Q. X. Xia, J. Fu, J. M. Yun, R. S. Mane and K. H. Kim, RSC Adv., 2017, 7, 11000 DOI: 10.1039/C6RA27880A

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