Mitchell E., Gupta R.K., Mensah-Darkwa K., Kumar D., Ramasamy K., Gupta B.K., Kahol P.
Department of Chemistry, Pittsburg State University, 1701 S. Broadway, Pittsburg KS-66762, United States; Department of Materials Engineering, Kwame Nkrumah University of Science and Technology, PMB Kumasi, Ghana; Department of Mechanical Engineering, North Carolina A and T State University, 1601 East Market Street, Greensboro NC-27411, United States; Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Albuquerque NM-87545, United States; National Physical Laboratory (CSIR), Dr K.S. Krishnan Road, New Delhi-110012, India; Department of Physics, Pittsburg State University, 1701 S. Broadway, Pittsburg, KS 66762, United States
Mitchell, E., Department of Chemistry, Pittsburg State University, 1701 S. Broadway, Pittsburg KS-66762, United States; Gupta, R.K., Department of Chemistry, Pittsburg State University, 1701 S. Broadway, Pittsburg KS-66762, United States; Mensah-Darkwa, K., Department of Materials Engineering, Kwame Nkrumah University of Science and Technology, PMB Kumasi, Ghana; Kumar, D., Department of Mechanical Engineering, North Carolina A and T State University, 1601 East Market Street, Greensboro NC-27411, United States; Ramasamy, K., Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Albuquerque NM-87545, United States; Gupta, B.K., National Physical Laboratory (CSIR), Dr K.S. Krishnan Road, New Delhi-110012, India; Kahol, P., Department of Physics, Pittsburg State University, 1701 S. Broadway, Pittsburg, KS 66762, United States
A facile method has been developed for the synthesis of nearly mono-dispersed iron oxide nanocrystals. The structural analysis of the synthesized iron oxide nanocrystals reveals the magnetite phase of Fe 3O4. The average particle size of the iron oxide was estimated to be 8 ± 2 nm. The observed particle size is in good correlation with the particle size estimated by magnetic measurements. Furthermore, these nanocrystals showed bi-functional ferromagnetic and superparamagnetic behavior below and above the blocking temperature, respectively. The potential use of these nanocrystals as an electrode for supercapacitors was examined by investigating the electrochemical behavior of iron oxide using cyclic voltammetry (CV) and galvanostatic charge-discharge tests. The CV characteristics of the iron oxide electrode showed a typical pseudocapacitive behavior in 3 M KOH solution. Moreover, the specific capacitance of 185 F g-1 at the current of 1 mA was observed with excellent cyclic stability, which is much higher than the reported value for iron oxide. The higher specific capacitance is due to the uniform nano-size of iron oxide. This work provides an ultimate facile method to synthesize nanostructured iron oxide for application in next generation energy storage materials. © the Partner Organisations 2014.
ferromagnetic material; iron oxide; nanocrystal; superparamagnetic iron oxide nanoparticle; article; chemical structure; cyclic potentiometry; electric conductivity; electric potential; electrochemical analysis; electrostimulation; energy conservation; facile synthesis; galvanic current; galvanostatic charge discharge test; magnetic field; molecular electronics; particle size; priority journal; supercapacitor; synthesis; temperature