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Fabrication of Na and K based MnO2 nanocomposites for supercapacitive applications.

ABSTRACT: α-Na0.5Mn0.93O2@Na0.91MnO2 (NaMnO) and K0.48Mn1.94O5@Na0.91MnO2 (KNaMnO) nanocomposites have been synthesized using solid-state reaction method. FESEM results convey the formation of column-shaped morphology. FTIR exhibited a shift in the vibration frequency upon potassium loading. Cyclic voltammetric curves are scanned (0 V-0.8 V) at different scan rates (5 mV/s to 100 mV/s) in 1M KOH electrolyte. Galvanostatic charge-discharge characteristics, for different current densities, have shown non-linear or pseudocapacitive characteristics of the prepared electrodes. High specific capacitance of ∼361 F/g and ∼143 F/g, at a current density of 1A/g, has been achieved for KNaMnO and NaMnO samples, respectively. KNaMnO sample exhibited higher capacitive retention (116 %), up to 2000 cycles, and obeys lower series resistance, charge transfer resistance, and Warburg impedance parameters, thus, convey higher efficiency of this compound for supercapacitor applications.

SUBMITTER: Vashisth P 

PROVIDER: S-EPMC11334620 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature

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Fabrication of Na and K based MnO<sub>2</sub> nanocomposites for supercapacitive applications.

Vashisth Priyanka P   Sharma Aditya A   Nasit Manas M   Singh Jitendra Pal JP   Anjali   Varshney Mayora M   Kumar Shalendra S   Won S O SO   Shin H J HJ  

Heliyon 20240726 15

α-Na<sub>0.5</sub>Mn<sub>0.93</sub>O<sub>2</sub>@Na<sub>0.91</sub>MnO<sub>2</sub> (<i>NaMnO</i>) and K<sub>0.48</sub>Mn<sub>1.94</sub>O<sub>5</sub>@Na<sub>0.91</sub>MnO<sub>2</sub> (<i>KNaMnO</i>) nanocomposites have been synthesized using solid-state reaction method. FESEM results convey the formation of column-shaped morphology. FTIR exhibited a shift in the vibration frequency upon potassium loading. Cyclic voltammetric curves are scanned (0 V-0.8 V) at different scan rates (5 mV/s to 100 mV/  ...[more]

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