Improved electrochemical performances of CuCo2O4/CuO nanocomposites for asymmetric supercapacitors. (10th January 2016)

• Record Type: Journal Article
• Authors: Shanmugavani, A.; Selvan, R. Kalai
• Is Part Of: Electrochimica acta. Volume 188(2016)
• Page Start: 852
• Page End: 862
• Publication Date: 2016-01-10
• Subjects: CuCo2O4 -- Microwave reflux -- cyclic voltammetry -- impedance spectra -- asymmetric supercapacitor; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.12.077
• Languages: English
• ISSNs: 0013-4686

Abstract

ABSTRACT: The impact of reaction time on the electrochemical capacitive properties of CuCo2 O4 /CuO is reported. The CuCo2 O4 /CuO nanocomposites are synthesized by microwave assisted reflux method at different reaction times (1, 5, 10 and 15 min) and are subjected to necessary characterization techniques to find its physico-chemical properties. The compound formation temperature is identified through TG/DSC analysis. Subsequently the phase formation is envisaged from XRD analysis. The characteristic functional groups and valency state of the elements are revealed from FT-IR and XPS analysis, respectively. The spherical and rod-like shape CuCo2 O4 /CuO particles are visualized from FESEM and TEM analysis. The CuCo2 O4 /CuO prepared at 5 min reaction time provides the enhanced capacitance of 781 F g −1 at 2 mV s −1 in 1 M KOH electrolyte. Further the asymmetric supercapacitor (ASC) is fabricated with activated carbon (AC) as negative electrode, which rendered the specific capacitance of 141 Fg −1 at 1 mV s −1 with an energy density of 18 Wh kg −1 and power density of 259 W kg −1 at 1 mA cm −2 in 1 M KOH electrolyte. In addition, this ASC retains nearly 100% of its initial capacitance over 5000 cycles.