Abstract
Nano-sized Fe 2O 3-loaded carbon material was prepared by loading Fe 2O 3 on carbon using a chemical method. Fe(NO 3) 3 was impregnated on carbon in an aqueous solution, and the mixture was dried and then calcined for 1 h at 400 °C in flowing Ar. Transmission electron microscopy (TEM) coupled with X-ray diffraction measurements revealed that small Fe 2O 3 particles (a few tenths of nanometers) were distributed on the carbon surface. The obtained nano-sized Fe 2O 3-loaded carbon material acted as an anode in a Li cell. High charge capacities of over 1000 mAh g −1 (reduction of Fe 2O 3) in the first charge process suggested that Fe 3+ in Fe 2O 3 was electrochemically reduced to Fe 0. Investigation of the charge material by X-ray photoelectron spectroscopy (XPS) confirmed that Fe 3+ is reduced to Fe 0. Nano-sized Fe 2O 3-loaded acetylene black (AB), which, due to the larger surface area of AB, gave a greater distribution of nano-sized Fe 2O 3 particles than graphite, provided a larger capacity than nano-sized Fe 2O 3-loaded graphite.
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