Interconnected ultra-thin nanosheets of Ni-Mn-oxide-NF nanoflake for energy storage supercapacitor

Official URL: https://dx.doi.org/10.1016/j.jiec.2024.12.016

In the quest for economic, efficient, and environmentally benign electrode materials, metal oxides are extensively investigated owing to its non-toxic and higher theoretical capacitance. Herein, we have reported the synthesis of Ni-Mn-oxide as electrode materials. The hydrothermal approach is used for the synthesis of nanoflake with ultra-thin nanosheets of Ni-Mn-oxide on NF. The sample was characterized for morphological, structural, elemental, and chemical composition by carious tools such as FE-SEM, HR-TEM, XRD, and XPS. The cyclic voltammetry measurements show excellent rate capability of Ni-Mn-oxide-NF electrode from lower to higher scan rates with distinctive pseudocapacitive features in 3 M aqueous KOH electrolyte. Based on Faraday redox reactions the enhanced specific capacitance of 1495 F g−1 and 1265 Fg−1 at 1 A g−1 and 2 A g−1 current densities were obtained by galvanostatic charge–discharge measurements. Furthermore, Ni-Mn-oxide-NF electrode reveals excellent cyclic stability till 10,000 GCD cycles with 99 % Coulombic efficiency. Consequently, the overall results of the study demonstrate the promising potential of nano-flaky Ni-Mn-oxide-NF electrode for energy storage with enhanced performance for the practical implementation of supercapacitors.