Abstract
Doping is one of the important methods to modify the physical and chemical properties of functional materials, which can be used to synthesize mixed ionic and electronic conducting metal oxides. Herein, the phase transformation of MnO2 from β- to α-phase has been proven by doping Ce3+ ions. With the increase of the amount of Ce3+ ions, the sizes of MnO2 nanorods were first decreased to 10–20 nm, then increased to 70 nm. The capacitive performance indicated that the specific capacitance of Ce-doped MnO2 electrode materials increased 10-fold compared with undoped MnO2, while the charge transfer resistance of Ce-doped MnO2 decreased. The present results show that rare earth ions can be used as a promising dopant to modify the crystallization behavior and electrochemical performance of MnO2 electrode materials.
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