Samarium-doped Fe3O4 nanoparticles with improved magnetic and supercapacitive performance: a novel preparation strategy and characterization
2018
Aghazadeh, Mustafa | Ganjali, Mohammad Reza
Sm³⁺-doped magnetite (Fe₃O₄) nanoparticles were synthesized through a one-pot facile electrochemical method. In this method, products were electrodeposited on a stainless steel (316L) cathode from an additive-free 0.005 M Fe(NO₃)₃/FeCl₂/SmCl₃ aqueous electrolyte. The structural characterizations through X-ray diffraction, field-emission electron microscopy, and energy-dispersive X-ray indicated that the deposited material has Sm³⁺-doped magnetite particles with average size of 20 nm. Magnetic analysis by VSM revealed the superparamagnetic nature of the prepared nanoparticles (Ms = 41.89 emu g⁻¹, Mr = 0.12 emu g⁻¹, and H Cᵢ = 2.24 G). The supercapacitive capability evaluation of the prepared magnetite nanoparticles through cyclic voltammetry and galvanostat charge–discharge showed that these materials are capable to deliver specific capacitances as high as 207 F g⁻¹ (at 0.5 A g⁻¹) and 145 F g⁻¹ (at 2 A g⁻¹), and capacity retentions of 94.5 and 84.6% after 2000 cycling at 0.5 and 1 A g⁻¹, respectively. The results proved the suitability of the electrosynthesized nanoparticles for use in supercapacitors. Furthermore, this work provides a facile electrochemical route for the synthesis of lanthanide-doped magnetite nanoparticles.
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