Structural, Optical, Magnetic and Electrochemical Properties of CeXO 2 (X: Fe, and Mn) Nanoparticles.

CeXO 2 (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 2 nanoparticles with FCC fluorite structure was confirmed by the Rietveld refinement, indicating the successful incorporation of Fe and Mn in the CeO 2 matrix with the reduced dimensions and band gap values. The Raman analysis supported the lowest band gap of Fe-doped CeO 2 on account of oxygen non-stoichiometry. The samples exhibited weak room temperature ferromagnetism, which was found to be enhanced in the Fe doped CeO 2 . The NEXAFS analysis supported the results by revealing the oxidation state of Fe to be Fe 2+ /Fe 3+ in Fe-doped CeO 2 nanoparticles. Further, the room temperature electrochemical performance of CeXO 2 (X: Fe, Mn) nanoparticles was measured with a scan rate of 10 mV s -1 using 1 M KCL electrolyte, which showed that the Ce 0.95 Fe 0.05 O 2 electrode revealed excellent performance with a specific capacitance of 945 Fּ·g -1 for the application in energy storage devices.