Facile synthesis of spinel nickel–manganese cobaltite nanoparticles with high rate capability and excellent cycling performance for supercapacitor electrodes.

Autor: Hoang, Thao Thi Huong, Le The, Son, Maenosono, Shinya, Van, Tuan Nguyen, Do Thi, Huong Giang, Chun, Sang-Eun, Viet, Thu Tran, Van, Nguyen To
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Zdroj: Journal of Applied Electrochemistry; Nov2023, Vol. 53 Issue 11, p2109-2123, 15p
Abstrakt: Nickel- and manganese-based spinel compounds have emerged as important candidates for electrochemical energy storage. In this study, a spinel nickel–manganese cobaltite (s-NMC) material was synthesized by facile hydrothermal/calcination route and the material exhibited remarkable pseudocapacitive behavior performance. The synthesized s-NMC material had a specific capacitance of 418.3 F g−1 at a scan rate of 10 mV s−1 (216.2 F g−1 at a current density of 1 A g−1) and retained 95% of its specific capacitance after 5000 charge–discharge cycles at a current density of 2 A g−1. These excellent electrochemical properties are attributed to the simultaneous presence of three transition metals in the s-NMC material. The asymmetric supercapacitor device using s-NMC delivered a maximum specific energy density of 16.58 Wh kg−1 at a specific power density of 825 W kg−1 and maintains of ∼97% specific capacitance after 2000 cycles at a current density of 2 A g−1. This study highlights that the diversification of transition metals in spinel-based metal oxides is an effective approach to enhance the electrochemical performances in resulting compound materials. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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