Theoretical investigation of quantum capacitance of Co-doped α-MnO2 for supercapacitor applications using density functional theory

Substitution doping of cobalt in α-MnO 2 can enhance its structural stability, electric conductivity, potential window, and surface charge density. The shortened band gap and localized states near the Fermi level improve the quantum capacitance ( C QC ) of α-MnO 2 .