Premium
Enhanced Supercapacitive and Magnetic Performances of Ho 3+ Doped Iron Oxide Nanoparticles Prepared Through a Novel One‐Pot Electro‐Synthesis Method
Author(s) -
Aghazadeh Mustafa,
Karimzadeh Isa,
Ganjali Mohammad Reza
Publication year - 2017
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700365
Subject(s) - materials science , nanoparticle , iron oxide nanoparticles , superparamagnetism , analytical chemistry (journal) , supercapacitor , iron oxide , electrochemistry , doping , magnetite , nuclear chemistry , oxide , aqueous solution , nanotechnology , magnetization , chemistry , electrode , magnetic field , metallurgy , physics , optoelectronics , chromatography , quantum mechanics
A novel one‐step electro‐chemical synthesis platform is developed for the preparation of Ho 3+ doped iron oxide nanoparticles (Ho‐IONPs). In this procedure, Ho‐IONPs are electro‐synthesized from an additive‐free aqueous solution of mixed Fe(NO 3 ) 3 · 9H 2 O, FeCl 2 · 4H 2 O, and HoCl 3 · 6H 2 O with applying dc current density of 10 mA cm −2 for 30 min. The characterization data provided by X‐ray diffraction (XRD), field emission electron microscopy (FE‐SEM) and energy‐dispersive X‐ray (EDX) confirmed that the synthesized Ho‐IONPs have composition of magnetite crystal structure doped with 20 wt.% Ho 3+ cations and average particles size of about 10 nm. The electrochemical results obtained galvanostatic charge‐discharge (GCD) tests showed that Ho‐IONPs could provide specific capacitance as high as 222 F g −1 at discharging condition of 0.5 A g −1 , and 95.6% capacity retention after 1000 GCD cycling, which confirmed the suitability of the electro‐synthesized Ho‐IONPs for use in supercapacitors. The results of vibrating sample magnetometer measurements confirmed better superparamagnetic behavior of Ho‐IONPs ( M r = 0.14 emu g −1 and H Ci = 2.37 G) as compared with pure IONPs ( M r = 0.95 emu g −1 and H Ci = 14.62 G) resulting from their lower M r and H Ci values. Based on the obtained results, the developed electro‐synthesis method is introduced as a facile procedure for the preparation of high performance metal ion doped magnetite nanoparticles.