A series of RuO2 doped MnO2 nanowires have been synthesized by performing electrodeposition in porous alumina template. MnO2 is well-known energy storage material with low cost, relative high energy density, and environmental benignity. However the power density is limited by its low conductivity. By co-depositing a small amount of the high energy density and conductive material RuO2 homogeneously into the MnO2 nanowires, followed by annealing treatment, we improve both the power density and energy density. The structure of these RuO2-doped MnO2 nanowires were characterized by TEM and SEM. And EDS mapping shows that the RuO2 is well distributed in the MnO2 matrix nanowires. The chemical constituents and phase were confirmed by X-ray photoelectron spectrapy and Raman spectropy. The amount of RuO2 can by controlled by varying the concentration of the electrodeposition solution. The masses of MnO2 and RuO2 were determined by the ICP. With 11 w.t. % RuO2 doping, the specific capacitance of MnO2 can reach 335 F/g at 20 mV/s, compared to 190 F/g for pure MnO2 nanowires at same scan rate. Study on the doping effect was also conducted by EIS and extrapolation of the cappacitances. This easily prepared RuO2 doped MnO2 nanowires arrays with significantly improved power and engeryg density are promising electrode materials for supercapacitor.

RuO<sub>2</sub> doped MnO<sub>2</sub> nanowires for high power and high energy density supercapacitors

246th National Meeting (2013)

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RuO2 doped MnO2 nanowires for high power and high energy density supercapacitors

RuO₂ doped MnO₂ nanowires for high power and high energy density supercapacitors