Fe3O4/carbon nanocomposite: Investigation of capacitive & magnetic properties for supercapacitor applications
Küçük Resim Yok
Tarih
2016
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Sa
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Fe3O4 nanoparticles with similar to 10 nm diameters were synthesized by an extremely low-cost, scalable and relatively biocompatible chemical co-precipitation method. Magnetic measurements revealed that Fe3O4 nanoparticles have bifunctional superparamagnetic and ferromagnetic character with saturation magnetization (Ms) values of 64 and 71 emu g(-1) at 298 K and 10 K, respectively. Pseudocapacitive Fe3O4 nanoparticles were then integrated into hazelnut shells - an abundant agricultural biomass - by an energy efficient hydrothermal carbonization method. Presence of magnesium oxide (MgO) ceramic template or its precursor in the hydrothermal reactor allowed simultaneous introduction of pores into the composite structure. Hierarchically micro-mesoporous Fe3O4/C nanocomposite possesses a high specific surface area of 344 m(2) g(-1). Electrochemical properties of Fe3O4/C nanocomposite were investigated by cyclic voltammetry and galvanostatic charge-discharge measurements in a conventional three-electrode cell. The Fe3O4/C nanocomposite is able to operate in a large negative potential window in 1 M Na2SO4 aqueous electrolyte (-1.2-0 V vs. Ag/AgCl). Synergistic effect of the Fe3O4 and carbon leads to enhanced specific capacitance, rate capability and cyclability making Fe3O4/C nanocomposite a very promising negative electrode material for asymmetric supercapacitors. (C) 2016 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Magnetic nanocomposite, Biomass, Hydrothermal treatment, MgO templating, Supercapacitor
Kaynak
Materials Chemistry And Physics
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
183
