https://doi.org/10.1140/epjp/s13360-022-03376-1
Regular Article
Hydrothermal synthesis of lanthanum tungstate (La2(WO4)3) for high energy density asymmetric supercapacitor
1
Additive Manufacturing Institute, Shenzhen University, 518060, Shenzhen, China
2
Department of Physics, Faculty of Science, Jazan University, P.O. Box 114, 45142, Jazan, Saudi Arabia
3
Department of Chemical Engineering, College of Engineering, Jazan University, P.O. Box 706, 45142, Jazan, Saudi Arabia
4
Department of Physics, College of Science, University of Bahrain, Zallaq, Kingdom of Bahrain
Received:
15
July
2022
Accepted:
9
October
2022
Published online:
25
October
2022
We report hydrothermal synthesis of Lanthanum tungstate (La2(WO4)3) as an electrode materials for supercapacitor applications. The electrochemical properties of the nanoparticles were investigated using cyclic voltammetry galvanostatic charge–discharge (GCD) and electrochemical impedance spectroscopy in 2.0 M KOH solution as an aqueous electrolyte. The highest specific capacitance of 920.1 F/g was achieved at a scan rate of 5.0 mV/s. A discharging time of 370.43 s was also recorded. La2(WO4)3 shows excellent electrochemical performance with power density of 1876.9 Wkg−1 and energy density of 19.5 Whkg1. La2(WO4)3 is employed as a positive and graphite as a negative electrode in a two-electrode system. The outstanding energy density of 77.7 Wh/kg and power density of 562.7 W/kg was achieved at a current density of 1.0 A/g while a high power density of 4028.8 W/kg is attained with energy density of 39.79 Wh/kg at a current density of 7.0 A/g. The device shows the outstanding capacity retention of 83.8% after 2000 GCD cycles. Additionally, the charge storage mechanism is analyzed for the asymmetric supercapacitor using Dunn’s model. The capacitive and diffusive behavior of whole nanomaterials was examined in detail; also the exponent law is utilized to ascertain the asymmetric nature of the fabricated material, determined through b values. This favorable behavior of La2(WO4)3 suggest potential candidature for electrode in asymmetric supercapacitor application.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
