Construction of MXene‐Coupled Nitrogen‐Doped Porous Carbon Hybrid from a Conjugated Microporous Polymer for High‐Performance Supercapacitors

MXene‐based organic material hybrids present huge potential for energy storage applications. However, the compatibility of hydrophilic MXenes with organic materials and their subsequent processing still remain elusive. Herein, a MXene‐based 2D sandwich‐like conjugated microporous polymer (MX‐CMP) manifesting high specific surface area and layered structure using a functionalized MXene as a 2D structure‐directing template is developed. The MX‐CMP is used as a robust organic precursor for preparing a MXene‐coupled nitrogen‐doped porous carbon (MX‐MC‐N) hybrid. The interconnected porous networks and large aspect ratio of MX‐MC‐N enhances the electrochemical active surface area and boosts the long‐distance charge transport. This leads to excellent performance for a three‐electrode, flexible all‐solid‐state supercapacitor (ASSC) and an asymmetric supercapacitor (ASC) with an expanded voltage window (1.6 V) and long‐term cyclability (>5000 cycles) compared to many state‐of‐the‐art analogous materials and hybrids. It is believed that the synthetic strategy presented for the MX‐MC‐N hybrid will indubitably pave a path for the development of novel MXenes and heteroatom‐doped porous hybrid materials for sustainable energy applications.