Interconnected porous MnO nanoflakes on nickel foam were prepared by a reduction of hydrothermal synthesized MnO 2 precursor in hydrogen. The architectures were applied to lithium ion batteries as electrodes. Compared with the as-synthesized MnO 2 anode, porous MnO nanoflakes showed superior cycling stability and rate performance. A high reversible capacity of 568.7 mA h g À1 was obtained at a current density of 246 mA g À1 for the second discharge. It retained a capacity of 708.4 mA h g À1 at the 200th charge-discharge cycle after cycling with various current densities up to 2460 mA g À1 and delivered a capacity of 376.4 mA h g À1 at a current density as high as 2460 mA g À1 , indicating that the architecture of the porous MnO nanoflakes grown on Ni foam is a promising electrode for lithium ion batteries.
Three-dimensional network structured a-Fe 2 O 3 was prepared by a facile chemical corrosion of a stainless steel plate followed by thermal oxidation. When the architecture was directly used as an electrode for lithium ion batteries (LIBs), a high reversible capacity of 858.2 mA h g À1 was obtained at a current density of 200 mA g À1 for the 2nd discharge. Especially, it retained a capacity of 1105.6 mA h g À1 at the 100th discharge-charge cycle. The mechanism behind the capacity increase with cycling has been investigated based on the capacity changes in different voltage regions. After cycling with various current densities, it can deliver a capacity of 520.0 mA h g À1 at a current density as high as 5000 mA g À1 , indicating that the electrode prepared by such a simple route can be a promising candidate for high-power LIBs.
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