راحيل احمدي

In this research, cobalt ferrite, ammonium phosphomolybdate nanoparticles and also CoFe2O4/POM nanocomposite were prepared using a simple one-pot and fast auto-combustion method activated by microwave irradiation at designed times and powers. To synthesize cobalt ferrite nanoparticles, cobalt and iron nitrate salts were used as available and cost-effective metal sources. Ammonium nitrate and glysine were used as oxidizing and fuel agents to drive the combustion reaction and form the CoFe2O4 nanoparticles under microwave irradiation with the power of 900 W for 30 min. Alongside this process, the synthesis of ammonium phosphopolyoxomolybdate was performed by utilizing Mo powder and hydrogen peroxide solution in the presence of (NH4)3PO4 by microwave assisted procedure with the irridation power of 360 W for 15 min. The CoFe2O4/POM nanocomposite was also prepared by running of the facile ultrasound-microwave method by anchoring triaminopropyltriethoxysilane. The structural and morphological characteristics of the prepared products were studied in details. The results revealed successful synthesis of the nano-sized products without any impurities with particulate morphology with an average particle size of about 40-80 nm. At the next step, the electrochemical properties of the synthesized products were eva‎luated by cyclic voltammetry (CV) tests at different potential scan rates from 0.01 to 0.5V.s-1. As expected, the results showed an acceptable specific capacitance about 230, 315 and 422 F.g-1 at the scan rate of 0.01 Vs-1 for the prepared CoFe2O4, POM and CoFe2O4/POM nanoparticles, respectively. A good reversible redox reaction and stable cycle life with the capacity retention of about 95% after 100 cycles was obtained which represented the good chance of these materials to use as electrode materials in energy saving applications.

نانوكامپوزيت، ريزموج، واكنش خوداحتراقي، كبالت فريت، پلي اكسوموليبدات

Nanocomposite, Microwave, Auto-combustin reaction, Cobalt ferrite, Polyoxomolybdat

Rahil Ahmadi

Dr. Azadeh Tadjarodi