Aqueous supercapacitors with ultrawide potential window and pH independent stability using electrodes of graphene oxide nanoribbons/Fe-MOFs nanocomposite

Funding Sponsor

National Research Foundation of Korea

Author's Department

Chemistry Department

Fourth Author's Department

Chemistry Department

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https://doi.org/10.1016/j.cej.2025.164012

All Authors

Asmaa R. Heiba M. O. Abdel-Salam Taeho Yoon Ehab El Sawy

Document Type

Research Article

Publication Title

Chemical Engineering Journal

Publication Date

7-15-2025

doi

10.1016/j.cej.2025.164012

Abstract

The growing role of renewable energy sources in power generation has significantly spurred the advancement of energy storage technologies, with supercapacitors (SCs) receiving considerable attention. In this study, graphene oxide nanoribbons (GONRs), Iron-based metal–organic frameworks (Fe-MOFs), and GONRs/Fe-MOFs composite were synthesized and evaluated as electrode materials for SCs applications, achieving an ultrawide potential window of 2.4 V in 0.7 M K2SO4 in three-electrode measurements. The prepared materials were thoroughly characterized using XRD, SEM, TEM, FT-IR, SAED, and XPS techniques. The specific capacitance (Cs) of the composite was measured in different electrolytes (1 M H2SO4, 0.7 M K2SO4, and 1 M KOH) to recognize the substantial influence of electrolyte properties on the supercapacitive performance and stability. The GONRs/Fe-MOFs composite demonstrated a synergistic effect, surpassing the performance of its components. In 1 M H2SO4, 0.7 M K2SO4, and 1 M KOH, the GONRs/Fe-MOFs electrode achieved specific capacitance (Cs) of 502, 493, and 403F/g, respectively, at a current density of 1 A/g, surpassing that of various MOFs/carbon-based materials. The symmetric SCs device, using GONRs/Fe-MOFs, in K2SO4 showed a potential window of 2.3 V, a Cs of 75F/g, an energy density of 58 Wh/kg, and a power density of 14596 W/kg at 1 A/g. Additionally, the GONRs/Fe-MOFs device in different electrolytes exhibited excellent capacity retention and coulombic efficiency after 10,000 cycles at 10 A/g, underscoring its potential as a highly stable material for SC applications. This research provides a promising path for employing MOF-based SCs using aqueous electrolytes and GONRs.

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