The Effect of Anion Modification on the Conductive Polymer/Ag‐Interdigitated Electrodes Micro‐Supercapacitor

Due to their outstanding electrical conductivity, simplicity of synthesis, and exceptional flexibility, conductive polymers are the most attractive electrode materials for micro‐supercapacitors (MSCs). However, when used as an electrode material alone, its poor capacitive performance and cycle‐life hinder the wide engineering applications. Herein, a polypyrrole (PPy)/Ag‐interdigitated electrodes MSCs is proposed, and the impact of aromatic sulfonic acid group anion modification on the electrochemical properties and flexibility of PPy/Ag MSCs is investigated. In the results, it is shown that different aromatic sulfonic‐acid‐based anionic dopants have different effects on the properties of PPy films. Among the prepared three PPy/Ag MSCs devices, PPy:anthraquinone‐2‐sulfonic acid/Ag MSCs have the highest areal capacitance (198.8 mF cm⁻²) at a current density of 0.5 mA cm⁻², surpassing PPy:2‐naphthalenesulfonic acid/Ag MSCs (114.3 mF cm⁻²) and PPy:p‐toluenesulfonic acid monohydrate/Ag MSCs (89.7 mF cm⁻²). Furthermore, at a power density of 0.25 mW cm⁻², the PPy:AQS/Ag MSCs exhibit a high energy density of 27.61 μWh cm⁻², which is above the most of the previously reported PPy‐based MSCs. Therefore, in this research, the groundwork is provided for improving properties of flexible MSCs based on PPy.