Ball Milling Nanoarchitectonics of Nitrogen‐Doped Cr₂O₃ on Thermally Exfoliated. A. morphous Nanosheets for a High‐Performance Supercapacitor

Abstract

There is a growing interest in energy storage technologies that are “green”. In this context, supercapacitors are expected to play a vital role in addition to next‐generation batteries. The material chosen in this work is based on Cr2O3. This is because amorphous CrO3 is considered one of the best materials for high‐performance supercapacitors. This is due to its high specific capacity and specific surface area. In this work, we report a stable and efficient nitrogen‐doped Cr2O3 (N : Cr2O3) based electrode material. Undoped Cr2O3 in amorphous form is first synthesized via thermal exfoliation. It becomes crystalline when it is doped with nitrogen through ball milling. The phase obtained is N : Cr2O3. N : Cr2O3 is shown as a promising suitable material for electrochemical applications. This electrode material gives a specific capacitance of 1200 F/g at 1 A/g, 85 % cycle stability over 1000 cycles. The improved electrochemical performance of the N : Cr2O3 is due to the incorporation of nitrogen into its crystal structure.