Issue 10, 2023

In situ synthesis of a non-toxic cobalt–benzimidazole metal–organic framework decorated reduced graphene oxide composite for asymmetric supercapacitor applications

Abstract

In this article, we report an effective synthesis of a cobalt–benzimidazole metal organic framework (Co–Bim MOF), which belongs to the Zeolitic imidazolate framework-9 (ZIF-9) family, and a cobalt–benzimidazole MOF@reduced graphene oxide (Co–Bim@rGO) composite through hydrothermal treatment for supercapacitor application. The structural and morphological features of the Co–Bim MOF and Co–Bim@rGO composite were confirmed by using various physicochemical techniques such as FT-IR, Raman, XRD, SEM, TEM, BET and XPS analysis. The SEM and BET analysis of the Co–Bim@rGO composite shows a layer-like structure with abundant pores and a large surface area (543 m2 g−1). The supercapacitive performance of the prepared electrodes was investigated using CV (cyclic voltammetry), GCD (Galvanostatic Charge–Discharge) and electrochemical impedance spectroscopy (EIS) analyses in aq. 1 M KOH. The as-fabricated Co–Bim@rGO composite showed a specific capacity of 1488 C g−1 at 1 A g−1 and maintained 96% of its initial capacitance after 8000 GCD cycles at 4 A g−1. The superior capacity performance of the Co–Bim@rGO composite is mainly ascribed to its mesoporous nature with an improved surface area, multiple redox sites and synergistic effect between the Co–Bim MOF and rGO moiety. The constructed Co–Bim@rGO//AC device showed an energy density of 90.55 W h kg−1 at a power density of 2396.28 W kg−1, and the device showed a cyclic stability of 88% even after 4000 GCD cycles at 3 A g−1. Further, biocompatibility analysis of the Co–Bim MOF and Co–Bim@rGO composite proved the non-toxic nature of the as-prepared electrode material. Thus, the effective energy storage ability of the Co–Bim@rGO composite confirms it as a potential candidate for supercapacitors in day-to-day applications.

Graphical abstract: In situ synthesis of a non-toxic cobalt–benzimidazole metal–organic framework decorated reduced graphene oxide composite for asymmetric supercapacitor applications

Article information

Article type
Paper
Submitted
20 Dec 2022
Accepted
26 Jan 2023
First published
04 Feb 2023

New J. Chem., 2023,47, 4832-4844

In situ synthesis of a non-toxic cobalt–benzimidazole metal–organic framework decorated reduced graphene oxide composite for asymmetric supercapacitor applications

E. Elanthamilan, A. Ganeshkumar, S. Wang and R. Rajaram, New J. Chem., 2023, 47, 4832 DOI: 10.1039/D2NJ06209G

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