MnO2, Co3O4 and MnO2:Co3O4 Stacked Thin Film Electrodes for Supercapacitor
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2016, Vol 4, Issue 4
Abstract
In the present work, MnO2, Co3O4 and MnO2:Co3O4 stacked thin films were prepared by Sol-gel spin coat method with Manganese acetate and Cobalt acetate as precursors. The XRD patterns showed crystalline behaviour with orthorhombic and cubic phase for MnO2 and Co3O4 respectively. MnO2: Co3O4 stacked film showed dominating peaks of both oxides with two new peaks of MnO2 and small shift in angle 2θ affecting lattice constants. The SEM images of MnO2 and Co3O4 thin film revealed the formation of well adherent and porous tetragonal structure with apparent breadth in the range of 500nm to 600nm respectively. Whereas stacked film exhibited decreased grain size to around 250nm with improved porosity. From electrochemical analysis it is found that, the MnO2, Co3O4 and MnO2:Co3O4 stacked films showed maximum specific capacitance of 440 F/g, 530 F/g and 600 F/g respectively at 10mV/s scan rate in 0.1M KOH electrolyte, specific energy 20.13 Wh/kg, 72.22 Wh/kg and 141.66 Wh/kg respectively and specific power 29.00 KW/kg, 52.00 KW/kg, 68.00 KW/kg respectively. Furthermore 75% stability is retained after 1000 cycles exhibiting good cyclic stability and long cycle life. These results suggest that, MnO2:Co3O4 stacked thin film can be a good electrode material for supercapacitor.
Authors and Affiliations
Dattatraya Sutrave, Sangeeta Jogade, Sriniwas Gothe
Keywords
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