A Narrow Bandgap, Isocyanide‐Based Coordination Polymer Framework for Micro‐Supercapacitors with AC Line‐Filtering Performance

Abstract

AbstractThe rapid expansion of wearable electronic devices boosts the development of energy storage minicomponents. Among them, the on‐chip micro‐supercapacitors (MSCs) have aroused widespread interest due to their distinctive characteristics, e.g., long cycle life, high power density, etc. Herein, an on‐chip MSC device is fabricated by using an isocyanide‐based coordination polymer framework as electrode material. Due to the narrow bandgap, flexibility, and compatibility of the coordination polymer, such MSC device with LiCl/PVA electrolyte delivers large capacitances (up to 0.98 mF cm−2 and 20.56 F cm−3 at a scan rate of 0.1 V s−1) and a short time constant (0.026 ms), which are comparable to the state‐of‐the‐art MSCs with polymer film electrodes. Moreover, this MSC device exhibits good AC line‐filtering ability (−70.8° at 120 Hz). This work introduces an implementable interfacial method to obtain coordination polymer frameworks for constructing miniaturized energy storage devices.