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Electrochemical investigation of ZnO effect of amorphous V 2 O 5 –P 2 O 5 glassy electrodes

Journal of Materials Science: Materials in Electronics(2023)

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Abstract
Using amorphous structures in the electrochemical environment is of great interest due to the excellent properties of the materials. In this work, electrochemical and surface properties of ZnO effect on Li-ion storage mechanism of amorphous V 2 O 5 –P 2 O 5 glassy electrodes have been investigated. Cyclic voltammetry results were shown a large potential range application for the electrodes. Analysis was demonstrated a reverse relationship between charge accumulation and scan rate for both electrodes. The specific capacitance of the electrodes was highly changed. The electrochemical impedance spectroscopy analyses were shown lower internal resistance, higher Warburg diffusion constant, higher ionic conductivity, and lower Li-ion diffusion coefficient for the V 2 O 5 –P 2 O 5 glassy electrode in the liquid LiClO 4 electrolyte. This improvement was proved the negative influence of ZnO upon the host architecture and hindered Li-ion storage in the electrode. According to the repeating chronoamperometry results, V 2 O 5 –P 2 O 5 –ZnO electrode is more stable in electrochemical test cycles. V 2 O 5 –P 2 O 5 electrode performance are increasing by test cycle. Surface properties of conductive layer for V 2 O 5 –P 2 O 5 –ZnO electrode was not damaged during the test. Lithium-ion diffusion coefficient of the V 2 O 5 –P 2 O 5 and V 2 O 5 –P 2 O 5 –ZnO was also calculated as 1 × 10 –11 and 2.1 × 10 –11 cm 2 s −1 , respectively. Evaluate the results, ZnO doping decreased the current density and also increased the charge transfer time drastically. V 2 O 5 –P 2 O 5 –ZnO electrode showed the best performance and it is a promising material for the battery storage, electrochromic windows, super capacitor and sensor applications.
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Key words
amorphous v2o5–p2o5,zno effect,electrochemical investigation
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