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Structure–Property Correlation in Dy–Ce Substituted SrFe12O19 for Enhanced Electrochemical Energy Storage and Visible-Light-Assisted Dye Degradation Response
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DOI：10.1016/j.ceramint.2026.08.145.png)
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Abstract
En 中文
Nanoparticles of Dy–Ce co-substituted M-type strontium hexaferrite with the general formula SrDyxCexFe12-2xO19 (x = 0.00–0.10) were synthesized by sol–gel auto-combustion method. X-ray diffraction (XRD) confirmed the formation of the hexagonal magnetoplumbite phase (space group P63/mmc) with a minor α-Fe2O3 impurity at intermediate substitution levels. Raman spectroscopy confirmed the formation of the magnetoplumbite hexagonal structure and indicated structural modifications induced by Dy–Ce co-substitution, and X-ray photoelectron spectroscopy (XPS) confirmed the presence of Fe3+/Fe2+, Ce3+/Ce4+, Dy3+ and lattice oxygen with oxygen vacancies, FE-SEM and HR-TEM studies identified the hexagonal plate-like nanostructures with improved grain homogeneity for x = 0.04, while EDS confirmed the successful doping of Dy and Ce without any impurity elements. The BET analysis showed a maximum specific surface area of 15.06 m2 g -1 for the x = 0.04 composition, which showed the enhancement of mesoporosity as a result of rare-earth substitution. Electrochemical measurements indicated that the maximum specific capacitance of the x = 0.04 sample was 983.8 F g−1 from cyclic voltammetry at 10 mV s−1 and 510.6 F g−1 from galvanostatic charge–discharge at 1 mA g−1 with 87% capacitance retention after 5000 charge–discharge cycles. Electrochemical impedance spectroscopy revealed reduced charge-transfer resistance and accelerated ion transport upon rare-earth substitution. The best photocatalytic performance was observed for the composition of x = 0.10 with 91.6% degradation of malachite green dye under solar irradiation and a first order rate constant of 0.01104 min-1. The results reveal that the Dy–Ce co-substitution is advantageous to the structural, electrochemical, and photocatalytic properties of the M-type strontium hexaferrite.
Keywords:
SrFe12O19
Ferrites
Supercapacitor
Oxygen Vacancies
Photocatalysis
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