A High-Energy-Density Hybrid Capacitor Enabled by Fibrous PANI and V2O5/MXene

Due to ecological conversion, People urgently need to develop higher-performance energy storage equipment to meet the growing demand for storage and green energy conversion in society. Doping HCl with PANI makes PANI cycle performance better. MXene’s large layer spacing allows intercalation of V2O5 layered material. The electrochemical performance can be optimized by using the high conductivity of MXene and the high specific capacity of V2O5 pseudocapacitor material. This study shows a new method of synthesizing a high-energy-density hybrid capacitor. Compared with the battery using V2O5 electrodes, the performance improvement of PANI/V2O5@MXene is verified by CV, GCD, and EIS. Without any current collectors, the maximum specific areal capacitance of the AF-SSC still reached 14.4 mF cm−2 at 0.03 mA cm−2 and the corresponding IR drop was fairly small. Even when the current density increased by 20 times to 0.6 mA cm−2, an impressive capacitance retention of 74.3% can be obtained.