While the purpose of adding acid types into the PVA plasticizer when making gel electrolytes in supercapacitors is for conductivity, what are the other purposes? So why do we add acid? Why do we add specifically sulfuric and phosphoric acid? Or KOH is added, is there a review or article explaining their purpose? I would appreciate it if you could share what you know, if you have any. There are interpretations of the electrochemical results when different gels are used. But I would like an article or rewiev on why they are used. In other words, it's a bit like the history of gel electrolytes, etc...