Metal-doped MnO 2 has been successfully synthesized via chemical precipitation method. Interestingly, doping can increase not only ion conductivity but also intrinsic electron conductivity. By doping, the particle size of MnO 2 decreases, relatively appropriate pore size distribution is obtained, and physically and chemically bound water content increases, all of which contribute to ion conductivity. Meanwhile, doping has induced some defects in MnO 2 crystal, increasing the hole concentration and then intrinsic electron conductivity. As the re...
