Issue 37, 2021

Aqueous Na-ion capacitor with CuS graphene composite in symmetric and asymmetric configurations

Abstract

Sodium ion capacitors (NICs) play a significant role in providing high energy and power densities in a single device at low cost. However, most of the work is focused on exploring the host material to store Na+ ions. This manuscript explores metal chalcogenide for NICs applications. Here, we successfully synthesized a pseudocapacitive copper sulphide (CuS) and its composite with graphene (CuS-G) electrode by a simple chemical route to store Na+ ions. A moderate crystallite size of 25 nm is found for CuS with spherical morphology. Electrochemical studies were performed in an aqueous medium for each of the two and three-electrode systems. The specific capacitances of 87 and 13 F g−1 were obtained at 0.5 A g−1 for the symmetric and asymmetric devices, respectively. For the asymmetric devices, an energy density of 2.6 W h kg−1 (maximum) at a power density of 246 W kg−1 was obtained and reduced to 1 W h kg−1 at the highest power density of 2980 W kg−1. The symmetric device shows a maximum energy density of 30 W h kg−1 at a power density of 380 W kg−1, which is reduced to 4 W h kg−1 at the highest power density of 4224 W kg−1. The cyclic stability for each device was performed up to 1000 cycles. A Coulombic efficiency of 100% is observed for both symmetric and asymmetric devices.

Graphical abstract: Aqueous Na-ion capacitor with CuS graphene composite in symmetric and asymmetric configurations

Supplementary files

Article information

Article type
Paper
Submitted
30 Jun 2021
Accepted
23 Aug 2021
First published
23 Aug 2021

New J. Chem., 2021,45, 17592-17602

Aqueous Na-ion capacitor with CuS graphene composite in symmetric and asymmetric configurations

M. Goswami, M. Athika, S. Kumar, P. Elumalai, N. Singh, N. Sathish and S. Kumar, New J. Chem., 2021, 45, 17592 DOI: 10.1039/D1NJ03183J

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