A stable and effective redox-mediator gel electrolyte has been prepared by doping indigo carmine (IC) into a polyvinyl alcohol sulfuric acid polymer system (PVA–H ₂ SO ₄ ), and a high performance solid state supercapacitor is fabricated by utilizing activated carbon as electrodes and the prepared gel polymer (PVA–H ₂ SO ₄ –IC) as an electrolyte and separator.
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Ma et al. (2015) studied this question.
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