Composite electrodes comprising TiO 2 and MnO 2 particles were prepared as photoelectrochemical capacitor electrodes that enable both photoelectric conversion and energy storage. A MnO 2 electrode was also prepared for characterization of MnO 2 alone, and its electrochemical capacitor property was evaluated. The MnO 2 electrode showed higher specific capacitance than a RuO 2 electrode. Results of the photoelectrochemical measurements demonstrated that the discharge capacity of the TiO 2 /MnO 2 composite electrode was slightly inferior to that of the TiO 2 and RuO 2 electrodes using. By reducing MnO 2 particle size, the composite electrode exhibited increased surface roughness and enhanced capacity. We consider that the smaller MnO 2 particles can efficiently store Na + ions even at a low photo-charge voltage of TiO 2 .
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