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Nanowire Na0.35MnO2 was prepared by a simple and low energy consumption hydrothermal method;its electrochemical performance as a cathode material for aqueous asymmetric supercapacitors in Na2SO4 solution was investigated.Due to the nanowire structure its capacitance (157 F g-l) is much higher than that (92 F g-1) of the rod-like Na0.95MnO2 from solid phase reaction although its sodium content is lower.