Pseudocapacitive Electrodes Produced by Oxidant‐Free Polymerization of Pyrrole between the Layers of 2D Titanium Carbide (MXene)

Heterocyclic pyrrole molecules are in situ aligned and polymerized in the ­absence of an oxidant between layers of the 2D Ti 3 C 2 T x (MXene), resulting in high volumetric and gravimetric capacitances with capacitance retention of 92% after 25 000 cycles at a 100 mV s −1 scan rate.