This study demonstrates the impact of water-in-salt (WIS) electrolytes on the performance of a supercapacitor using nitrogen and sulphur co-doped activated carbon as electrode material, highlighting its potential for enhanced energy storage capabilities. The electrolyte (WIS) used is a 12 m NaNO3 and the electrode material is a previously reported nitrogen, sulphur co-doped activated carbon sourced from mangosteen shell (NS-MSAC). Furthermore, the three-electrode test of NS-MSAC demonstrates a high specific capacitance of 206 F g-1 at a current density of 0.5 A g-1 within a potential window of 0 to -1.0 V. The symmetric supercapacitor built with NS-MSAC achieved a voltage range of 0-2.0 V by exploiting the beneficial electrochemical properties of 12 m NaNO3, which include a higher potential window, low viscosity, high conductivity, and electrochemical stability. The assembled symmetric device featuring NS-MSAC//NS-MSAC delivered a specific energy of 25 Wh kg-1 at a power density of 512 W kg-1. Additionally, after 8000 charge/discharge cycles, approximately 85% of the capacitance was retained. This highly concentrated aqueous electrolyte strategy is promising to produce remarkable supercapacitor performance.

This article is Open Access

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