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Porous Mn2O3 nanocubics, which were synthesized by a facile hydrothermal route followed by a calcination process, exhibited a specific capacitance of 191.1Fg−1 and a high rate capability with 58.6% specific capacitance retention even when the current density is increased by 50 times, and an excellent long-term cycle stability, and the fabricated simple symmetric supercapacitor was also fabricated...
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