| Summary: | CeXO<sub>2</sub> (X: Fe, Mn) nanoparticles, synthesized using the coprecipitation route, were investigated for their structural, morphological, magnetic, and electrochemical properties using X-ray diffraction (XRD), field emission transmission electron microscopy (FE-TEM), dc magnetization, and cyclic voltammetry methods. The single-phase formation of CeO<sub>2</sub> nanoparticles with FCC fluorite structure was confirmed by the Rietveld refinement, indicating the successful incorporation of Fe and Mn in the CeO<sub>2</sub> matrix with the reduced dimensions and band gap values. The Raman analysis supported the lowest band gap of Fe-doped CeO<sub>2</sub> on account of oxygen non-stoichiometry. The samples exhibited weak room temperature ferromagnetism, which was found to be enhanced in the Fe doped CeO<sub>2</sub>. The NEXAFS analysis supported the results by revealing the oxidation state of Fe to be Fe<sup>2+</sup>/Fe<sup>3+</sup> in Fe-doped CeO<sub>2</sub> nanoparticles. Further, the room temperature electrochemical performance of CeXO<sub>2</sub> (X: Fe, Mn) nanoparticles was measured with a scan rate of 10 mV s<sup>−1</sup> using 1 M KCL electrolyte, which showed that the Ce<sub>0.95</sub>Fe<sub>0.05</sub>O<sub>2</sub> electrode revealed excellent performance with a specific capacitance of 945 Fּ·g<sup>−1</sup> for the application in energy storage devices.
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