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Despite the wildly studies on MnO2, the poor stability limits its broad use. Here, Ni doping was used to enhance the stability of the MnO2. In this paper, Ni-doped δ-MnO2 was successfully synthesized through a hydrothermal method, and nickel ions exist as divalent Ni2+ in Ni-doped MnO2. Ni doping did not change the crystal phases but promote the growth of MnO2 microspheres and the dielectric loss...