Influence of La-dopant on the material characteristics and supercapacitive performance of MnO₂ electrodes

Abstract

Manganese dioxide was synthesized by electrodeposition method with Mn (CH₃COO)₂ · 4H₂O as a raw material. La(NO₃)₃ · 6H₂O was doped in electroyte during the preparing process to improve the performance of MnO₂ electrodes. The micrographs, crystal structure and element content of electrodes were analyzed by SEM, XRD and atomic absorption spectroscopy, respectively. It is found that the La content ratio in the dioxide can be easily controlled by adjusting the composition of the plating solution. Appropriate amount of doped La can increase the surface area of Mn/La materials, resulting in the supercapacitive behavior enhancement. Electrochemical tests show that the specific capacitance is significantely increased from 198.72 F · g⁻¹ to 276.60 F · g⁻¹ by La-doping.

Keywords

manganese dioxide / nanomaterials / deposition / rare earth doping / specific capacitance

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