| Fabrication of lithium-oxygen batteries based on MnO2-CeO2/carbon nanotubes composite cathode catalyst |
| کد مقاله : 1004-CNF |
| نویسندگان |
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سیدرضا موسوی نژاد1، معصومه صالحی1، زهرا شریعتی نیا *2 1دانشکده شیمی، دانشگاه صنعتی امیرکبیر ، نهران ، ایران 2Department of Chemistry, Amirkabir University of Technology (Tehran Polytechnic), P.O.Box:15875-4413, Tehran, Iran. |
| چکیده مقاله |
| The rechargeable lithium-air batteries have attracted a considerable interest because of their theoretical energy density which is higher than 11000 Wh/Kg [1]. The energy density of Li-O2 batteries is 5-10 times greater than those of lithium ion batteries [2]. This high energy density makes them a good candidate in totally electric cars, hybrid cars, and advanced electrical devices [3]. Catalysts can have a critical role in decreasing the over-potential during charge and discharge processes through facilitating the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) processes which leads in increasing the battery performance [4]. Catalysts utilized in the Li-O2 batteries are categorized to four classes including metals (noble and non-noble), carbonaceous materials and composite compounds [5]. MnO2-CeO2/CNT nanocomposite was synthesized by hydrothermal process in which the CNT, CeO2 and MnO2 amounts were determined using TGA equal to 55, 25 and 20%, respectively. The MnO2-CeO2/CNT nanocomposite was utilized as an efficient cathode electrocatalyst in lithium-oxygen batteries. The energy storage capacity of the Li-O2 battery fabricated by MnO2-CeO2/CNT nanocatalyst was 7980 mA.h/gelectrode at the 50 mA/gelectrode current density and 6860 mA.h/gelectrode at the 100 mA/gelectrode current density. The charge and discharge over-voltages are 0.68 and 0.20 V, respectively, for MnO2-CeO2/CNT at the 100 mA/gelectrode current density. The cyclic performance of the MnO2-CeO2/CNT nanostructure cathode was 70 cycles reflecting its suitable performance. The electrochemical impedance spectroscopy (EIS) demonstrated an appropriate reversibility for the cathode in such a way that the resistance created at discharge was decreased at the charging process. |
| کلیدواژه ها |
| Lithium-oxygen battery, Electrochemical impedance spectroscopy (EIS), MnO2-CeO2/CNT, Nanocomposite, Cycleability |
| وضعیت: چکیده برای ارائه به صورت پوستر پذیرفته شده است |