High Performance Hybrid Supercapacitor Based an Efficient Redox-Mediated Organic Electrolyte

Development of efficient high power and high energy storage systems for future energy supply and mobility is the objective of technology in this field. Supercapacitors are considered as one of the newest innovations in the field of energy storage systems. Nowadays, two main strategies have been employed to improve the energy characteristics of the supercapacitors. One of them is centered mainly on the application of highly efficient redox nano-materials because of their unique physical and chemical properties. The other strategy is increasing its working voltage window, which is obtainable using redox electrolyte. Gel polymer electrolytes can provide high reliability without electrolyte leakage as well as thin-form and separator-free devices.However, the practical application of gel polymer electrolytes is limited. The difficulty is mainly due to their relatively low ionic conductivity, which is usually lower than ۱۰ mS cm−۱. However, many efforts from the ionic conductivity have been focused on cellulose–chitin– AMImBr–H۲SO۴, polymethyl methacrylate (PMMA)–EC–PC–TEAClO۴, polyvinyl alcohol (PVA)–KOH, PVA–H۲SO۴ and polyacrylate (PAA)–KCl.Here, a redox-mediated gel-polymer electrolyte was prepared by adding P–benzenediol to a PVA-H۲SO۴ gel-polymer electrolyte and assembled into a supercapacitor with activated carbon electrodes. Based on the obtained results, this supercapacitor represented high specific capacitance, specific power and specific energy values of ۹۷ F g-۱, ۵۷۰ W kg-۱ and ۲۲.۸۷ Wh kg-۱, respectively. These encouraging results show the opportunity to develop large cells using these design approaches, with large facile synthesis and low-cost components.

کلیدواژه ها:

Redox-mediated gel-polymer electrolyte ، Pseudocapacitance ، P-benzenediol ، Supercapacitor.