MXene/Polymer Hybrid Materials for Flexible AC-Filtering Electrochemical Capacitors

Aluminum electrolytic capacitors (AECs) have been used as power devices for AC filtering applications and are critical for the internet of things and self-powered wearable sensors. However, the capacitance of AECs, orders of magnitude lower than that of electrochemical capacitors (ECs), and the rigid shape of AECs are obstacles for their use in miniature and flexible systems. The development of flexible ECs that provide high volumetric capacitance and operate in the frequency range of AECs would thus have an enormous impact. In order to resolve the trade-off nature between the transport properties and charge storage capability of energy storage materials, we devised porous MXene/conducting polymer hybrid architectures for large-scale flexible ECs. These MXene hybrid-based ECs allow miniaturization of electronic systems, occupying a high position of capacitance versus frequency response plot, toward the development of form-factor-free miniature and scalable future electronic systems.