“…Despite these efforts, the energy density is still lower than that of batteries; this is dependent on the potential window, which is influenced by the electrolyte 7. Aqueous electrolytes usually offer lower potential windows (< 1 V), and, thus, organic electrolytes, including ionic liquid (ILs), are being explored with great interest owing to their excellent properties such as higher ionic conductivity, moderate viscosity, non‐flammability, lower toxicity, low volatility, good thermal stability, and safety 8,9. Among the various ILs, functionalized ILs such as 1‐butyl‐3‐methylimidazolium tetrafluoroborate [BMIM][BF 4 ],10 1‐methyl‐3‐octylimidazolium tetrafluoroborate [OMIM][BF 4 ],11 1‐butyl‐3‐methylimidazolium hexafluorophosphate [BMIM][PF 6 ],12 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide [EMIM][TFSI],13 etc.…”