A simple but efficient Li-doping approach for enhancing supercapacitor performance of the BiFeO 3 perovskite nanostructures

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 53; no. 39; pp. 16355 - 16366
• Main Authors: Al-Hasani, Yaser A, Al-Hejri, Tariq M, Jadhav, Vijaykumar V, Mane, Rajaram S
• Format: Journal Article
• Language: English
• Published: England 08.10.2024
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/D4DT01343C

The capacitive energy storage mechanism offers quick charging, an extended life span, and, far, higher power density compared to batteries. This study presents a simple and efficient lithium (Li)-doping approach for enhancing electrochemical energy storage properties of perovskite-type bismuth ferrite (BiFeO ) Bi Li FeO (BLFs), where = 0, 0.05, 0.10, 0.15, and 0.20. An addition of the Li results in a significant decrease in the crystallite size of the BiFeO from 67 nm to 26 nm, and, in addition to the surface morphology, the Bi/Fe ratio is changed. Electrochemical tests, performed in 6.0 M KOH electrolyte solutions in a half-cell system, have confirmed a significant increase in the specific capacitance (SC) and specific capacity values. After Li-doping, at a current density of 5 A g , the SC of the pristine BLF electrode increases to 807.5 from 175.5 F g (specific capacity ( ) = 21.4-100.94 mA h g ) for the x = 0.10 Li-doped BLF electrode. The as-manufactured BLF-C//Bi S asymmetric supercapacitor device, wherein Bi S acts as a negative electrode and BLF-C as a positive electrode, in addition to an energy density of 48.65 W h kg and a power density of 750 W kg , delivers an outstanding 155.6 F g SC ( = 64.8 mA h g ) at a current density of 5 A g . The ' ' screen, consisting of nearly 42 bright LEDs, is ignited at full brightness by connecting a twin-cell (BLF-C//Bi S ) assembly. Even after 5000 redox cycles, the as-designed BLF-C//Bi S asymmetric supercapacitor demonstrates an exceptional 92.67% cycling stability, suggesting the importance of an adopted Li-doping strategy for obtaining an enhanced energy storage performance in energy storage devices.