Issue 8, 2020

Facile hydrothermal synthesis of porous MgCo2O4 nanoflakes as an electrode material for high-performance asymmetric supercapacitors

Abstract

In this work, porous MgCo2O4 nanoflakes (MgCo2O4 NFs) and MgCo2O4 nanocubes (MgCo2O4 NCs) have been successfully synthesized through a simple hydrothermal method combined with a post calcination process of the precursor in air. The morphology of the MgCo2O4 samples can be easily tuned by changing the hydrothermal temperature and reaction time, respectively. The porous MgCo2O4 NFs with an average pore size of 12.5 nm had a BET specific surface area up to 64.9 m2 g−1, which was larger than that of MgCo2O4 NCs (19.8 m2 g−1). The MgCo2O4 NFs delivered a specific capacitance of 734.1 F g−1 at 1 A g−1 and exhibited a considerable rate performance with 74.0% capacitance retention at 12 A g−1. About 94.2% of its original capacitance could be retained after 5000 charge–discharge cycles at a constant current density of 5 A g−1. An asymmetric supercapacitor (ASC) was assembled by using MgCo2O4 NFs as the positive electrode and AC as the negative electrode, and the ASC had a wide operation voltage of 1.7 V and a high energy density of 33.0 W h kg−1 at a power density of 859.6 W kg−1. Such outstanding electrochemical performances make the MgCo2O4 NFs a promising candidate for supercapacitor applications. In addition, the simple and scalable synthesis method can be extended to the preparation of other metal oxide-based electrode materials.

Graphical abstract: Facile hydrothermal synthesis of porous MgCo2O4 nanoflakes as an electrode material for high-performance asymmetric supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
03 may 2020
Accepted
18 iyn 2020
First published
19 iyn 2020
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2020,2, 3263-3275

Facile hydrothermal synthesis of porous MgCo2O4 nanoflakes as an electrode material for high-performance asymmetric supercapacitors

H. Chen, X. Du, R. Wu, Y. Wang, J. Sun, Y. Zhang and C. Xu, Nanoscale Adv., 2020, 2, 3263 DOI: 10.1039/D0NA00353K

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, 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 commercial 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