The construction of an asymmetric hybrid supercapacitor with 2D materials MXene and perovskite

The traditional energy storage techniques have several initial drawbacks limiting this application. Batteries suffer from a slow charge and discharge rate, and capacitors have low energy densities. The pseudocapacitor, a technology that storages energy through surface chemical reactions, is supposed to fill the energy and power density gap between the dielectric capacitor and battery. In order to verify the superiority of this technology, an asymmetric hybrid supercapacitor has been designed with 2D material MXene (Ti3C2Tx) as the negative electrode and high-entropy perovskite-type materials (La(CoCrFeMnNi)O3) as the positive electrode. XRD has verified the crystallography of both electrode materials, and the morphology has been further studied by SEM, TEM, and HAADF-STEM. The electrochemical performance has been tested by CV, GCD, and EIS. Besides, the influence of the different elements of the high-entropy perovskite has been studied. The asymmetric supercapacitor shows both high energy and power density, which may be used to extend energy-storage technology applications.