Abstract
AbstractA simple synthesis of microcrystalline delafossite CuFeO2 is reported. Rhombohedral CuFeO2 0.7–2.5 μm crystals were obtained by heating an aqueous solution of Fe(NO3)3, Cu(NO3)2, and propionaldehyde to 180 °C for 2 h in a microwave oven, which enables the synthesis of the CuFeO2 microcrystals with significantly reduced heating time at a mild temperature. The electrode made with the delafossite CuFeO2 discharged at 0.01 V and charged at 1.5 V vs Na+/Na and retained a reversible capacity of 240 mAh g−1 at a specific current of 0.1 Ag−1 after 200 cycles. The delafossite CuFeO2 microcrystals could be a potential anode material for sodium‐ion batteries considering the simple synthetic method and acceptable reversible capacity compared to other nanostructured anode materials.
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