Microfluidic Fabrication of Hierarchical‐Ordered ZIF‐L(Zn)@Ti₃C₂T_<i>x</i> Core–Sheath Fibers for High‐Performance Asymmetric Supercapacitors

Abstract

Abstract We report hierarchical‐ordered ZIF−L(Zn)@Ti 3 C 2 T x MXene core–sheath fibers, in which a ZIF−L(Zn) nanowall array sheath is grown vertically on an anisotropic Ti 3 C 2 T x core by Ti−O−Zn/Ti−F−Zn chemical bonds. Through highly efficient microfluidic assembly and microchannel reactions, ZIF−L(Zn)@Ti 3 C 2 T x exhibits well‐developed micro‐/mesoporosity, ordered ionic pathways, fast interfacial electron conduction and large‐scale fabrication, significantly boosting charges dynamic transport and intercalation. The resultant ZIF−L(Zn)@Ti 3 C 2 T x fiber presents large capacitance (1700 F cm −3 ) and outstanding rate performance in a 1 M H 2 SO 4 electrolyte. Additionally, ZIF−L(Zn)@Ti 3 C 2 T x fiber‐based solid‐state asymmetric supercapacitors deliver high energy density (19.0 mWh cm −3 ), excellent capacitance (854 F cm −3 ), large deformable/wearable capabilities and long‐time cyclic stability (20 000 cycles), which realize natural sunlight‐induced self‐powered applications to drive water level/earthquake alarm devices.