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Hollow nanospheres of mesoporous Co9S8 are successfully synthesized by a facile solvothermal reaction followed with a high-temperature annealing in Ar/H2. These hollow nanoparticles exhibit a reversible capacity of ~1414mAhg−1 after 100 cycles at 100mAg−1. In the course of this cycling, there is a significant capacity recovery, which is associated with enhanced capacitance caused by repeated electro-chemical...
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