Electric Double Layer of Polymerized Ionic Liquid: Spatial Charge Separation Distance of Fixed Polymeric Ions and Free Counterions
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초록
내용
Polymerized ionic liquids (PIL) are electrolyte in which one of the ionic spices of ionic liquids is fixed to a polymer chain and the other species are mobile. PIL are non-volatile and highly conductive, and thereby, are well studied as electrolyte materials in energy storage and electrochemical devices. In particular, electric double layers (EDL) formed at the interface of electrodes and electrolyte play key roles in many electrolyte applications. However, EDL capacitances from fixed polymeric ions and free counterions in either electrode have not been decoupled. Here, we elucidate the charge separation distance of fixed and free ions in EDL by applying large area asymmetric electrodes (i.e. one is flat the other is highly porous). With this design, we can decouple capacitance differences of polymer ions and capacitance of free ions under different direction of DC bias. This study will provide insight to understand the physical and electrical properties of polymerized ionic liquids.