Hydrothermal synthesis and electrochemical properties of FeNbO4 nanospheres

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概要

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• Iron niobate (FeNbO4) nanospheres of an orthorhombic structure were synthesized using a hydrothermal (HT) process at 250°C, and were characterized using X-ray diffraction, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, and Brunauer–Emmett–Teller (BET) measurements. The FeNbO4 nanospheres obtained through the HT reaction revealed a uniform size with an average diameter of 5–10 nm, and a larger specific surface area (82.72 m2 g−1) than that of bulk FeNbO4 powder (2.51 m2 g−1) prepared by a solid-state reaction. In addition, the electrochemical properties of the FeNbO4 powders versus Li were evaluated using cyclic voltammetry and galvanostatic charge/discharge cycling. Importantly, the FeNbO4 nanospheres delivered a reversible capacity of over 200 mAh g−1 after 20 cycles, and provided an enhanced rate capability compared to the bulk material.

著者

• CHO In-Sun

  Department of Materials Science & Engineering, College of Engineering, Seoul National University

• HONG Kug

  Department of Materials Science & Engineering, College of Engineering, Seoul National University

• SHIM Hyun-Woo

  Department of Materials Science & Engineering, Ajou University

• KIM Dong-Wan

  Department of Materials Science & Engineering, Ajou University

• LIM Ah-Hyeon

  Department of Materials Science & Engineering, Ajou University

• HONG Kug

  Department of Materials Science & Engineering, College of Engineering, Seoul National University

• CHO In-Sun

  Department of Materials Science & Engineering, College of Engineering, Seoul National University

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