Issue 8, 2024

Augmenting the performance of thermally deoxygenated graphite oxide supercapacitor electrodes using 6 M KOH electrolyte with K3Fe(CN)6 redox additive

Abstract

This study focuses on enhancing the performance of thermally deoxygenated graphite oxide (TDGO) supercapacitor electrodes by incorporating a redox additive viz., 0.03 M K3Fe(CN)6 in 6 M KOH. Characterization of the prepared TDGO was conducted through XRD, Raman, XPS, FESEM and BET surface area analysis, revealing incomplete deoxygenation and the presence of oxygen functional groups. TDGO exhibits a maximum significant surface area of 288.3 m2 g−1 with an average pore diameter of 2.4 nm. The ID/IG ratio of 0.98 suggests the prevalence of structural defects dominating the sp2 graphitic structure. FESEM images reveal exfoliated irregular layers in TDGO. In a three-electrode configuration, the optimized system achieves an areal specific capacitance (Csp) of 817 F cm−2 at 1 A g−1, a 2.5-fold increase compared to 6 M KOH alone. The [Fe(CN)6]3−/[Fe(CN)6]4− redox couple in the electrolyte alters the charge storage mechanism from surface-controlled to diffusion-controlled pseudocapacitance. A symmetric TDGO300 supercapacitor in the KOH/K3Fe(CN)6 redox electrolyte system exhibits a Csp of 414.6 F cm−2, delivering an energy density of 17.4 W h kg−1 at a power density of 235 W kg−1. Notably, the TDGO300 supercapacitor retains 97.4% of its initial capacitance after 2000 continuous charge–discharge cycles. This work establishes a straightforward strategy to significantly improve the capacitive performance of TDGO supercapacitors by leveraging redox additives, showcasing their potential for advanced energy storage applications.

Graphical abstract: Augmenting the performance of thermally deoxygenated graphite oxide supercapacitor electrodes using 6 M KOH electrolyte with K3Fe(CN)6 redox additive

Supplementary files

Article information

Article type
Paper
Submitted
31 dec 2023
Accepted
26 feb 2024
First published
26 feb 2024
This article is Open Access
Creative Commons BY license

Mater. Adv., 2024,5, 3367-3378

Augmenting the performance of thermally deoxygenated graphite oxide supercapacitor electrodes using 6 M KOH electrolyte with K3Fe(CN)6 redox additive

A. M S and B. V, Mater. Adv., 2024, 5, 3367 DOI: 10.1039/D3MA01188G

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