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A solid-state supercapacitor is assembled using redox-mediated gel polymer as the electrolyte and separator and coconut shell–derived, steam-activated carbon as the electrodes. The gel polymer electrolyte (GPE) is based on poly(vinyl alcohol) (PVA)-potassium hydroxide (KOH)-hydroquinone (HQ), and is obtained using solution casting technique. Amorphous nature of the GPE is confirmed from XRD studies...
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