Hollow Zn-doped Fe 2 O 3 nanospheres were fabricated by a facile solvothermal method followed by postannealing treatment. The as-synthesized hollow nanospheres have a uniform size with a diameter of about 200-500 nm. The growth mechanism of the hollow Zn-doped Fe 2 O 3 nanospheres was proposed based on many contrast experiments. Compared with Fe 2 O 3 without Zn doping, hollow Zn-doped nanospheres showed an improved electrochemical performance in terms of high rate capability and long cycling performance. At current densities of 1 A g −1 and 2 A g −1 , Zn-doped Fe 2 O 3 exhibited an initial capacity of 861.5 and 698.4 mA h g −1 , respectively, and the capacity was maintained at 580 and 470 mA h g −1 after 500 cycles. These excellent electrochemical properties can be attributed to the unique hollow nanostructure, and Zn doping makes the crystal structure more stable during discharge/charge cycles.
Hollow Mn-doped Fe2O3/PPy nanospheres have been fabricated, which exhibited excellent electrochemical performance as an anode material for lithium-ion batteries.
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