Abstract
The nano CaCO3 (nC) and various concentrations (0.02, 0.04, 0.06, and 0.08 M) of Eu3+ doped CaCO3/PEG nanocomposites (respectively represented as nCE1, nCE2, nCE3, and nCE4) were prepared through the biomimetic method. The functional groups, purity, and phase of the prepared products were assessed by FTIR and XRD. The prepared products were CaCO3/PEG and Eu3+ doped CaCO3/PEG with rhombohedral structures. The chemical state of the sample was studied using XPS, which revealed the presence of Ca, C, O, and Eu. No secondary phase was detected. FE-SEM and HR-TEM images of nCE4 show the distinct rhombohedral and spherical-like morphologies. The electrochemical performance of nC, nCE1, and nCE4 was investigated using a three-electrode system with Na2SO4 as the electrolyte. The prepared electrode materials behaved as pseudocapacitors, and the nCE4 electrode exhibited a specific capacitance value which is three times higher than that of the nC electrode. The present study suggests that nCE4 can be used as an electrode in supercapacitor applications. The cyclic stability of the CaCO3/PEG: Eu (0.08 M) nanocomposite after 1000 cycles at 3 A g−1 showed better cycle endurance, with a high retention of 97 %.
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