Electrochemical Properties and Supercapacitive Characterization of Polyaniline-Graphene Oxide Micro-Electrode Arrays

International Journal of Chemistry | Vol. 12, No. 11, November 2021 | pp. 81–88

DOI: 10.46882/2021/IJC/000157

Article Type: Original Research Paper

Title: Electrochemical Properties and Supercapacitive Characterization of Polyaniline-Graphene Oxide Micro-Electrode Arrays

Names of Authors: U. B. Aliyu¹, K. Y. Lee²*

Authors’ Affiliations:
¹Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria.
²Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore.

Abstract: Fabricating highly efficient electrochemical energy storage units requires the development of hybrid polymer electrodes that exhibit high specific capacitance and fast ion diffusion kinetics. This research details the synthesis and electrochemical characterization of polyaniline-graphene oxide (PANI-GO) thin-film micro-electrode arrays prepared via in situ chemical oxidative polymerization pathways. The surface topology and morphological features of the hybrid films were analyzed using field emission scanning electron microscopy (FESEM), FT-IR, and Raman spectroscopy. FESEM imaging confirmed that a highly continuous, ultra-thin polyaniline layer was uniformly deposited across the conductive graphene oxide skeletal network. Electrochemical performance was investigated via cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) loops in a 1.0 M H₂SO₄ electrolyte system. The optimized PANI-GO hybrid electrode delivered a maximum specific capacitance of 412 F/g at a current density of 1.0 A/g, which was substantially higher than standalone pure polyaniline films (145 F/g). Electrochemical impedance spectroscopy (EIS) data showed a very low charge-transfer resistance of 0.38 ohms, confirming accelerated ionic transport across the polymeric interface. Cyclic stability evaluations proved that the composite material retained 89.2% of its capacitive profile after 2000 continuous cycles.

Keywords: Polyaniline; Graphene oxide; Energy storage; Supercapacitors; Cyclic voltammetry; Specific capacitance

Manuscript Timeline: Received: January 22, 2021; Revised: February 25, 2021; Accepted: March 18, 2021; Published: November 09, 2021.

Citation: Aliyu, U. B., & Lee, K. Y. (2021). Electrochemical Properties and Supercapacitive Characterization of Polyaniline-Graphene Oxide Micro-Electrode Arrays. International Journal of Chemistry, 12(11), 81–88.

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