Ball Milling Nanoarchitectonics of Nitrogen‐Doped Cr 2 O 3 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 Cr 2 O 3. This is because amorphous CrO 3 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 Cr 2 O 3 (N : Cr 2 O 3 ) based electrode material. Undoped Cr 2 O 3 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 : Cr 2 O 3 . N : Cr 2 O 3 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 : Cr 2 O 3 is due to the incorporation of nitrogen into its crystal structure.