Polyethylene Oxide Incorporated Ammonium Iodide Doped With Ionic Liquid Trihexyl (Tetradecy) Phosphonium Dicyanamide‐Based Polymer Electrolyte for Dual Energy Storage Devices

ABSTRACTCation phosphonium‐based ionic liquids (PBILs) have recently gained attention since the 2000s due to their thermal stability and low viscosity for better ionic conduction in electrochemical devices. This paper introduces a new low‐viscosity phosphonium‐based ionic liquids (PBILs)—trihexyl (tetradecy) phosphonium dicyanamide—infused in polyethylene oxide: ammonium iodide (NH4I) complex polymer electrolyte. The electrochemical impedance spectroscopy studies indicate that the ionic conductivity reaches 2.03 × 10−4 S/cm at 6 wt.% PBILs at ambient temperature. The PBILs‐doped polymer electrolyte is predominantly ionic confirm by ionic transference numbers (tion) calculation. Also the electrochemical stability window was found to be 3.2 V suitable for energy storage devices. The highest achieve ionic conductivity PBILs‐doped polymer electrolyte sandwich between the electrodes for dual energy devices like electric double layer capacitors (EDLCs) and dye‐sensitized solar cells (DSSCs). This study shows improvements in ionic conduction, double‐layer stability, and light‐harvesting efficiency, resulting in higher energy density and power density in EDLCs and better photovoltaic performance in DSSCs. These findings highlight the versatility and efficacy of phosphonium‐based ionic liquid‐doped polymer electrolytes for advanced energy storage and conversion applications.

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