Synthesis and characterisation of manganese ferrite oxides for use in pseudocapacitive super capacitors as electrode materials
Quah, Ivan Tian Min
Date of Issue2016
School of Materials Science and Engineering
Manganese Ferrite Oxides were synthesis in a bid to ascertain their specific capacitance for the use as supercapacitor electrodes. 5 samples of varying composition in the form of MnxFe3-xO4 were synthesised via chemical co-precipitation and post-annealing. Said 5 samples had x values of 0.5, 1, 1.5, 2 and 2.5 and were put under electrochemical and materials characterisation using techniques such as cyclic voltammetry, TEM and XRD. The cyclic voltammetry was conducted using a 3 electrode system with 1M of KOH as the electrolyte. The highest specific capacitance measured was from Mn1.5Fe1.5O4 of 114.35 F/g and an increasing trend was observed for the first 3 samples, namely Mn0.5Fe2.5O4, MnFe2O4 and Mn1.5Fe1.5O4. A decrease in Cs was subsequently observed for the next sample followed by an increase for the last sample. Said phenomena of decrease/increase could not be adequately explained however, to explain the phenomena; several reasons were put forward such as, insufficient amount of Mn3+ and Fe3+ ions and the presence of an unidentified phase.
Final Year Project (FYP)
Nanyang Technological University