An ongoing field of study involves improving the performance and stability of benchmarked metal catalysts employing nanostructured non‐metallic materials, which is both fascinating from a fundamental and an application standpoint. By rapidly thermally exfoliating CrCl3 6H2O precursors, amorphous few‐layered nanosheets of Cr2O3 (3‐5 nm) are synthesized. The exfoliated Cr2O3 was characterized using structural and electrochemical techniques. Cyclic Voltammetry (CV) revealed that the material delivers a specific capacitance of 1100 F/g at 10 mV/s, which is among the best‐reported values for this material. This sample has a modest surface area of 155 m2/g with a mesoporous structure. Electrochemical impedance spectra (EIS) for amorphous Cr2O3 revealed lower series resistance (Rs) and charge transfer resistance (Rct) of 0.6 Ω and 0.88 Ω, respectively. Additionally, this material delivers a desirable energy and power density of 20.2 Wh/kg and 125 W/kg, respectively.
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.
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