Simple Microwave-Assisted Synthesis of Delafossite CuFeO2 as an Anode Material for Sodium-Ion Batteries

초록

A simple synthesis of microcrystalline delafossite CuFeO2 is reported. Rhombohedral CuFeO2 0.7-2.5 mu m crystals were obtained by heating an aqueous solution of Fe(NO3)(3), Cu(NO3)(2), and propionaldehyde to 180 degrees 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 mAhg(-1) at a specific current of 0.1 Ag-1 after 200 cycles. The delafossite CuFeO(2 )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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