Improvement of Supercapacitive and Superparamagnetic Capabilities of Iron Oxide Through Electrochemically Grown La3+ Doped Fe3o4 Nanoparticles Publisher



Aghazadeh M¹ ; Karimzadeh I² ; Ganjali MR^{3, 4}
Source: Journal of Materials Science: Materials in Electronics Published:2017

Abstract

In this paper, undoped and La3+ doped iron oxide nanoparticles (IONPs and La-IONPs) are prepared through a one-step electrosynthesis process. The prepared La-IONPs are characterized by X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), energy-dispersive X-ray (EDX) and vibrating sample magnetometer (VSM) analyses. Furthermore, the electrochemical performance of IONPs and La-IONPs are evaluated using cyclic voltammetry (CV) and galvanostat charge–discharge (GCD) tests. The analyses results showed that both electrosynthesized samples have magnetite (Fe3O4) crystal structure. The doped IONPs exhibited composition of 15% wt La3+ cations incorporated into Fe3O4. Also, both IONPs and La-IONPs samples have nano-particle morphologies with particle size of 15 and 20 nm, respectively. The VSM data indicated that an improvement in the superparamagnetic behavior of Fe3O4 is obtained as a result of La3+ doping, where La-IONPs sample exhibited smaller remanent magnetization (Mr) and coercivity (Ci) values as compared with undoped IONPs. Furthermore, GCD showed that La-IONPs are capable to deliver specific capacity value of 187 F g−1 and 84.8% after 2000 discharging cycles at 1 A g−1, where undoped IONPs electrode exhibited specific capacity and cycle life of 145 F g−1 and 78.7%, respectively, at the same discharging conditions. The obtained results well established the improvement of capacitive characters for La3+ iron oxide electrode. © 2017, Springer Science+Business Media, LLC.