The electrochemical properties of the Fe2O3 electrode in alkaline solution were investigated by using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The effects of K2S additive in electrolyte solution on the electrochemical characteristics of Fe2O3 electrodes were also investigated. The obtained results show that the additive strongly affected on the impedance, redox reaction rate and cyclability of Fe2O3 electrode. | VNU Journal of Science: Mathematics – Physics, Vol. 34, No. 2 (2018) 45-51 Electrochemical Properties of Fe2O3 Electrode in Alkaline Solution Containing K2S Additive Bui Thi Hang* International Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), 1 Dai Co Viet, Hai B Trung, Hanoi, Vietnam Received 20 June 2018 Revised 12 July 2018; Accepted 13 July 2018 Abstract: To find the suitable materials for Fe/air battery anode, in this study Fe 2O3 electrodes were prepared using Fe2O3 nanoparticles. The size and morphology of Fe2O3 material were observed by scanning electron microscope (SEM). The electrochemical properties of the Fe 2O3 electrode in alkaline solution were investigated by using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The effects of K 2S additive in electrolyte solution on the electrochemical characteristics of Fe2O3 electrodes were also investigated. The obtained results show that the additive strongly affected on the impedance, redox reaction rate and cyclability of Fe2O3 electrode. Keywords: Fe2O3 nanoparticles, Fe2O3 electrode, K2S additive, Fe-air battery. 1. Introduction Today with the development of science and technology, electric devices and electric vehicles have been also fast growing. To meet the power requirements of these devices and vehicles, researches of batteries have been also constantly evolved. In recent years, iron-air battery have attracted a lot of attentions by scientists because of their high theoretical energy density, long life, environmentally friendly and can be applied in electric vehicles (EVs) and hybrid electric vehicles (HEVs) [1-7]. Although recent researches on this battery has achieved remarkable success, but due to technological challenges the iron electrode still has some shortcomings to overcome such as the passivity caused by the Fe(OH)2 layer formed during the discharge process, hydrogen gas generated simultaneously with the reduction of .
