Abstract
Ni3[Fe(CN)6]2 nano-cubic precursors were prepared by chemical coprecipitation at room temperature with nickel acetate and potassium ferricyanide as raw materials. The corresponding NiFe2O4-NiO@C composites with excellent crystallization were prepared by two-stage oxidation at low temperature. The microstructure and electrochemical behavior of the materials showed that the Prussian blue analog was transformed into metal oxide while the carbon coating was maintained in the two-stage oxidation at low temperature. The existence of the carbon coating reduces the charge transfer impedance to 31.5 Ω. At the current density of 500 mA/g, the reversible capacity of 632.7 mAh/g is maintained after 500 cycles. At the same time, carbon cladding can also enhance the role of pseudocapacitance in the material. At the scanning rate of 0.1 mV/s, the pseudocapacitance account for 54.4% of the total discharge capacity, which is significantly higher than that of uncoated materials.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 21776051), the Natural Science Foundations of Guangdong (2018A030313423), Guangzhou University Research Projects (YG2020017) and the Research Fund Program of Key Laboratory of Fuel Cell Technology of Guangdong Province.
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Yang, W., Pang, X., Xue, Z. et al. Synthesis of Metal Oxides@C (Metal = Ni, Fe) Based Prussian Blue Analogs as a High-performance Anode Material for Lithium-ion Battery. Acta Metall. Sin. (Engl. Lett.) 34, 435–443 (2021). https://doi.org/10.1007/s40195-021-01205-5
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DOI: https://doi.org/10.1007/s40195-021-01205-5