Asymmetric supercapacitor, based on composite MnO2-graphene and N-doped activated carbon coated carbon nanotube electrodes

Manganese dioxide nanotubes and activated carbon coated multiwalled carbon nanotubes (AC-MWCNT) are prepared by hydrothermal methods. MnO2-graphene positive electrodes with good dispersion of individual components are fabricated using poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) as a co-dispersant. The unique structure of PAZO, containing chelating aromatic monomers allows for efficient …