Abstract:

MnO2 is deposited on a nickel foam substrate by using the electrodeposition method, and then the conductive polymer PEDOT-PSS is in situ polymerized on its surface, which was designed to format the composite materials. The impact of wrapped conductive polymer layer on the electrochemical properties has been studied with different polymerization time. The morphologies and structures of the composite materials have been characterized by Raman spectrum, scanning electron microscope and transmission electron microscope, respectively. The results of the electrochemical tests show that the P-MnO2-2 composite with electropolymerization for 10s has the highest specific capacity (346.5 F·g1), which is 1.9 times higher than MnO2 electrode (179.1 F·g1). The P-MnO2-2 composite still has a specific capacity of 223.5 F·g1 at the high current density of 6 A·g1. Finally, a flexible symmetrical solid-state supercapacitor has been assembled using the KOH gel-solid electrolyte to light a LED lamp.

Key words:  MnO2, conductive polymer, composite, electrodeposition, flexible supercapacitor