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The results showed that Fe2O3@C material with α-Fe2O3 structure and amorphous carbon were successfully synthesized by one-step hydrothermal method. CV measurements indicate that the redox reaction rate of the Fe2O3@C electrode is higher than that of the Fe2O3@AB electrode using commercial Fe2O3 and AB (Acetylene Black Carbon). | VNU Journal of Science: Mathematics – Physics, Vol. 34, No. 4 (2018) 70-76 Synthesis and Electrochemical Properties of Fe2O3@C Composite Bui Thi Hang* International Institute for Materials Science, Hanoi University of Science and Technology, Hanoi, Vietnam Received 14 December 2018 Revised 25 December 2018; Accepted 25 December 2018 Abstract: Fe2O3@C material was prepared by one-step hydrothermal method for use as a negative electrode in an iron-air battery. The structure of Fe2O3@C was determined by X-ray diffraction (XRD) measurement while their morphology was observed by scanning electron microscopy (SEM). The electrochemical properties of the Fe2O3@C electrode in alkaline solution were investigated using cyclic voltammetry (CV) measurement. The results showed that Fe2O3@C material with α-Fe2O3 structure and amorphous carbon were successfully synthesized by one-step hydrothermal method. CV measurements indicate that the redox reaction rate of the Fe 2O3@C electrode is higher than that of the Fe2O3@AB electrode using commercial Fe2O3 and AB (Acetylene Black Carbon). Keywords: Fe2O3@C material, Fe2O3@C electrode, hydrothermal method, iron-air battery. 1. Introduction The demand for energy storage devices (batteries, supercapacitors.) has been increased rapidly due to their high energy density, long life, reasonable price [1-10]. Previous literatures have shown that metal/air batteries have higher theoretical energy density and specific energy but cheaper, safer than Lithium-ion batteries [7, 11-14]. However, the actual power density of this battery is still low. Therefore, metal/air batteries have been studying to increase their actual cycle performance and capacity. In metal/air battery, the metal is used as the negative electrode material contained in the battery and the oxygen is the positive electrode material that is dispersed into the battery from the air. Most metal/air batteries use aqueous electrolyte such as potassium hydroxide. Among the metal/air
