Excellent cyclic stability of symmetric and asymmetric supercapacitors constructed by graphene deposited Cu and Ni electrodes

Onder Yargi*, Mehmet Murat Ozmen, Sude Buyukpehlivan, Ali Gelir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Supercapacitors (SC) with ionic liquid bis(trifluoromethanesulfonyl)imide (TFMS) trapped polyacrylamide (PAAM) hydrogel separator between graphene deposited nickel and copper foam electrodes were designed and assembled in CR2032 coin cell. The symmetric and asymmetric SCs were named as G-NiF/G-NiF, G-CuF/G-CuF, and G-NiF/G-CuF where G-NiF, and G-CuF stands for graphene deposited nickel foam and copper foam, respectively. The best electrochemical performance was obtained for G-NiF/G-NiF in terms of higher energy, power, and current densities from the galvanostatic charge-discharge (GCD) and CV curves. Specific capacitances of G-CuF/G-CuF, G-NiF/G-NiF, and G-NiF/G-CuF SCs were found as 8.3, 9.8, and 10.4 F g−1 at 0.5 mA, respectively. Capacitance retention of both G-NiF/G-NiF and G-NiF/G-CuF SCs does not change and reveals excellent performance of 100% up to 5000 cycles indicating long term stability in SCs applications.

Original languageEnglish
Pages (from-to)20801-20810
Number of pages10
JournalInternational Journal of Energy Research
Volume46
Issue number14
DOIs
Publication statusPublished - Nov 2022

Bibliographical note

Publisher Copyright:
© 2022 John Wiley & Sons Ltd.

Funding

We acknowledge financial support of The Scientific and Technological Research Council of Turkey (TUBITAK, Project number: 1139B412000540).

FundersFunder number
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu1139B412000540

    Keywords

    • coincell
    • copper
    • graphene
    • nickel
    • PAAM hydrogel
    • supercapacitor

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