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A novel spherical carbon nanoparticle decorated activated carbon (SNAC) material with a high surface area of about 1555 m 2 g À1 is prepared from the dead mango leaves by an eco-friendly method for the detection of toxic heavy metal ions and energy storage applications. The limits of detection (LODs) for the determination of Cd(II), Pb(II), Cu(II), and Hg(II) ions at the SNAC-modified GCE are 24.4 Â 10 À9 M, 5.7 Â 10 À9 M, 23.2 Â 10 À9 M and 24.6 Â 10 À9 M, respectively. On the other hand, the obtained maximum specific capacitance for the single electrode from galvanostatic charge discharge is 478 F g À1 at 1 A g À1 . The symmetric supercapacitor cell provides a higher specific capacitance (SC) of 55 F g À1 at 1 A g À1 , and energy density of 10.75 W h kg À1 at a power density of 300 W kg À1 .

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Sodium metal phosphates, NaMPO4 (M = Mn, Co and Ni) were successfully synthesized by a solution combustion synthesis (SCS) method using glycine-nitrate as a precursor.

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The nanosized Mn 3 O 4 particles were prepared by microwave-assisted reflux synthesis method. The prepared sample was characterized using various techniques such as X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), Raman analysis, and transmission electron microscopy (TEM). Electrochemical properties of Mn 3 O 4 nanoparticles were investigated using cyclic voltammogram (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge analysis in different electrolytes such as 1 M KCl, 1 M Na 2 SO 4 , 1 M NaNO 3 , and 6 M KOH electrolytes. XRD pattern reveals the formation of single-phase Mn 3 O 4 nanoparticles. The FT-IR and Raman analysis also assert the formation of Mn 3 O 4 nanoparticles. The TEM image shows the spherical shape particles with less than 50 nm sizes. Among all the electrolytes, the Mn 3 O 4 nanoparticles possess maximum specific capacitance of 94 F g -1 in 6 M KOH electrolyte calculated from CV. The order of capacitance obtained by various electrolytes is 6 M KOH [ 1 M KCl [ 1 M NaNO 3 [ 1 M Na 2 SO 4 . The EIS and galvanostatic charge-discharge results further substantiate with the CV results. The cycling stability of Mn 3 O 4 electrode reveals that the prepared Mn 3 O 4 nanoparticles are a suitable electrode material for supercapacitor application.