Influence of Fe and Cu Co-Doping on Structural, Magnetic and Electrochemical Properties of CeO2 Nanoparticles

• Published in: Materials Vol. 15; no. 12; p. 4119
• Main Authors: Kumar, Shalendra, Ahmed, Faheem, Ahmad, Naushad, Shaalan, Nagih M., Kumar, Rajesh, Alshoaibi, Adil, Arshi, Nishat, Dalela, Saurabh, Alvi, Parvez Ahmad, Kumari, Kavita
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 09.06.2022; MDPI
• Subjects: Capacitance; CeO2; Cerium oxides; Copper; dc magnetization; DMS; Doping; Electrochemical analysis; Electrodes; Electrolytes; Energy gap; Investigations; Magnetic moments; Magnetic properties; Magnetic saturation; Magnetization; Nanomaterials; Nanoparticles; Nitrates; Optical properties; Particle size; Raman spectra; Raman spectroscopy; Room temperature; Semiconductors; Spectrum analysis; supercapacitor; X-ray diffraction; XRD
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma15124119

The nanoparticles of CeO2, Ce0.98Fe0.02O2, and Ce0.78Fe0.02Cu0.20O2 were synthesized using the co-precipitation-synthesis technique. The effect of co-doping of Fe and Cu on structural, optical, and magnetic properties as well as specific capacitance have been studied using X-ray diffraction (XRD), scanning-electron microscopy (SEM), UV-visible spectroscopy, Raman spectroscopy, dc magnetization, and electrochemical measurements at room temperature. The results of the XRD analysis infer that all the samples have a single-phase nature and exclude the formation of any extra phase. Particle size has been found to reduce as a result of doping and co-doping. The smallest particle size was obtained to be 5.59 nm for Ce0.78Fe0.02Cu0.20O2. The particles show a spherical-shape morphology. Raman active modes, corresponding to CeO2, were observed in the Raman spectra, with noticeable shifting with doping and co-doping indicating the presence of defect states. The bandgap, calculated using UV-Vis spectroscopy, showed relatively low bandgap energy (1.7 eV). The dc magnetization results indicate the enhancement of the magnetic moment in the samples, with doping and co-doping. The highest value of saturation magnetization (1.3 × 10−2 emu/g) has been found for Ce0.78Fe0.02Cu0.20O2 nanoparticles. The electrochemical behavior studied using cyclic-voltammetry (CV) measurements showed that the Ce0.98Fe0.02O2 electrode exhibits superior-specific capacitance (~532 F g−1) along with capacitance retention of ~94% for 1000 cycles.