Effect of SiO2on Silicotungstic Acid-H3PO4-poly(vinyl alcohol) Electrolyte for Electrochemical Supercapacitors
Source abstract
Abstract
The environmental stability of a solid silicotungstic acid (SiWA)-H 3 PO 4 -poly(vinyl alcohol) (PVA) electrolyte in electrochemical supercapacitor (EC) applications was improved by the incorporation of nano-SiO 2 . Under ambient conditions, enhanced water retention and improved stability were observed for the electrolyte with SiO 2 compared to the electrolyte without SiO 2 . Due to the strengthening in bond interaction between SiO 2 and water molecules, the electrolyte with SiO 2 exhibited a more consistent proton conductivity than the one without SiO 2 . In addition, a cross-linking effect of SiO 2 on the PVA polymer was observed as a secondary function. The performance of the SiO 2 -containing electrolyte was evaluated in a planar double layer EC. The thin solid EC demonstrated high rate capability of 5,000 Vs −1 in cyclic voltammograms with good environmental stability and excellent cycle life (up to 100,000 cycles demonstrated).
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Research context
OpenAlex topics: Supercapacitor Materials and Fabrication · Fuel Cells and Related Materials · Advanced battery technologies research
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