Nickel-Doped La0.8Sr0.2Mn1‿i>xNixO3 Nanoparticles Containing Abundant Oxygen Vacancies as an Optimized Bifunctional Catalyst for Oxygen Cathode in Rechargeable Lithium–Air Batteries

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• 作者：Zhaodong Wang ; Ya You ; Jing Yuan ; Ya-Xia Yin ; Yu-Tao Li ; Sen Xin ; Dawei Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 16, 2016
• 年：2016
• 卷：8
• 期：10
• 页码：6520-6528
• 全文大小：695K
• ISSN：1944-8252

文摘

In this work, Ni-doped manganite perovskite oxides (La_0.8Sr_0.2Mn_1–xNi_xO₃, x = 0.2 and 0.4) and undoped La_0.8Sr_0.2MnO₃ were synthesized via a general and facile sol–gel route and used as bifunctional catalysts for oxygen cathode in rechargeable lithium–air batteries. The structural and compositional characterization results showed that the obtained La_0.8Sr_0.2Mn_1–xNi_xO₃ (x = 0.2 and 0.4) contained more oxygen vacancies than did the undoped La_0.8Sr_0.2MnO₃ as well as a certain amount of Ni³⁺ (e_g = 1) on their surface. The Ni-doped La_0.8Sr_0.2Mn_1–xNi_xO₃ (x = 0.2 and 0.4) was provided with higher bifunctional catalytic activities than that of the undoped La_0.8Sr_0.2MnO₃. In particular, the La_0.8Sr_0.2Mn_0.6Ni_0.4O₃ had a lower total over potential between the oxygen evolution reaction and the oxygen reduction reaction than that of the La_0.8Sr_0.2MnO₃, and the value is even comparable to that of the commercial Pt/C yet is provided with a much reduced cost. In the lithium–air battery, oxygen cathodes containing the La_0.8Sr_0.2Mn_0.6Ni_0.4O₃ catalyst delivered the optimized electrochemical performance in terms of specific capacity and cycle life, and a reasonable reaction mechanism was given to explain the improved performance.