Porous MnO_2 Nano Whiskers Bunch/Activated Carbon Based Composite Electrodes for High Energy Density Supercapacitor

摘要

A simple room temperature method was used to synthesize Porous α-MnO_2 nano whiskers bunch. The porous α-MnO_2 /Activated carbon (AC) composites were prepared by very simple mechanical mixing method with varying amount of MnO_2. A symmetric supercapacitor stack was fabricated using the prepared composite electrode material. The composite with 30% MnO_2exhibit a maximum specific capacitance of 107 Fg~(-1) at 1 mAcm~(-2) in non-aqueous electrolyte. The corresponding energy density was found to be 8.35 Whkg~(-1). The electrode also exhibits excellent cyclic stability.