Abstract
The current work shows the preparation of plasticized chitosan-magnesium acetate Mg(CH3COO)2-based polymer electrolyte dispersed with nickel (Ni) metal complexes via solution casting. Investigations of electrical and electrochemical properties of the prepared polymer composite electrolyte were carried out. The structural and optical properties of the samples were studied using X-ray diffraction (XRD) and UV-Vis spectroscopy techniques. The structural and optical outcomes revealed a clear enhancement in both absorbance and amorphous nature of the samples upon the addition of Ni metal complexes. Through the simulation of impedance data, various ion transport parameters were calculated. The electrochemical performance of the sample was examined by means of transference number measurement (TNM), linear sweep voltammetry (LSV) and cyclic voltammetry (CV) measurements. The TNM analysis confirmed the dominance of ions as the main charge carrier in the electrolyte with tion of (0.96) compared to only (0.04) for tel. The present electrolyte was stable in the range of 0 V to 2.4 V, which was obtained from linear sweep voltammetry (LSV). A result from CV proved that the electrical double-layer capacitor (EDLC) has a capacitive behavior as no redox peaks could be observed. The presence of Ni improved the charge–discharge cycle of the EDLC due to its amorphous behavior. The average performances of the EDLC were recorded as 41.7 F/g, 95%, 5.86 Wh/kg and 628 W/kg for specific capacitance, coulombic efficiency, energy and power densities, respectively. The fabricated EDLC device was found to be stable up to 1000 cycles.
Highlights
In times of intensive development of electric vehicles around the world, supercapacitors (SCs) play a large role [1]
The obtained UV-Vis result of this study is similar to the one for iron–metal complexes reported by Wang et al [30], which was synthesized by green methodology using various extracts, such as Rosemarinus officinalis, Eucalyptus tereticornis and Melaleuca nesophila
The performance of CS-Mg(CH3COO)2 system has been enhanced with the presence of glycerol and Nickel (Ni) metal complexes
Summary
In times of intensive development of electric vehicles around the world, supercapacitors (SCs) play a large role [1]. Due to the existing tradeoff between the electrochemical potential window and ionic conductivity, one should carefully tune the properties of the electrolyte in EDLC to achieve both high energy and power densities [9,10]. Asnawi et al [20] have shown that the addition of zinc metal complex into the chitosan (CS)-based electrolyte is aimed at improving the amorphous phase within the polymer body to be ionically satisfactory conduction material. The electrical, mechanical and physical properties of these natural polymers need significant alteration to best fit the energy device applications In this regard, different approaches can be taken to achieve this goal, including using various fillers like metal complexes and plasticizers. The current work shows proof of the influence of the metal complex and plasticizer on the performance of the EDLC assembly up to 1000 cycles
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