Formation of one dimensional nanorods with microsphere of MnCO3 using Ag as dopant to enhance the performance of pseudocapacitors

Abstract

Abstract The peculiar morphology of nanorods mixed with microspheres of manganese carbonate (MnCO3) doping with different percentages (0, 2, 4, 6%) of silver (Ag) was synthesized by simple co-precipitation method. The effect of Ag doping on structural, morphological and compositional properties of MnCO3 were investigated. XRD results revealed that the synthesized samples have hexagonal-rhombohedral structure and the peaks are shifted towards higher angles with increasing Ag content. The pure MnCO3 exhibited microsphere like morphology with the size in the rage of 0.8–2.5 μm. XPS analysis confirmed the presence of Mn, C, O and Ag elements. The specific capacitance values are calculated and 4% Ag-doped MnCO3 electrode exhibited a high specific capacitance of 554.6 Fg-1 at a current density of 0.5 Ag-1, good rate capability of 54.74% and excellent cycle stability of 87.22% capacitance retention after 1000 cycles. From these results, Ag-doped MnCO3 could be preferred as the potential competitor for future electrochemical supercapacitor devices.