School of Chemistry and Chemical Engineering, Hefei University of Technology , Hefei 230009, P. R. China.
Department of Chemistry & Biochemistry, Utah State University , Logan, Utah 84322, United States.
ACS Appl Mater Interfaces. 2018 Feb 14;10(6):5543-5550. doi: 10.1021/acsami.7b17289. Epub 2018 Jan 30.
In this work, nitrogen-doped LaNiO perovskite was prepared and studied, for the first time, as a bifunctional electrocatalyst for oxygen cathode in a rechargeable lithium-oxygen battery. N doping was found to significantly increase the Ni contents and oxygen vacancies on the bulk surface of the perovskite, which helped to promote the oxygen reduction reaction and oxygen evolution reaction of the cathode and, therefore, enabled reversible LiO formation and decomposition on the cathode surface. As a result, the oxygen cathodes loaded with N-doped LaNiO catalyst showed an improved electrochemical performance in terms of discharge capacity and cycling stability to promise practical Li-O batteries.
本工作首次将氮掺杂 LaNiO 钙钛矿作为可充锂-氧电池的氧阴极双功能电催化剂进行了研究。氮掺杂被发现显著增加了钙钛矿体相表面的 Ni 含量和氧空位，这有助于促进阴极的氧还原反应和氧析出反应，从而使 LiO 在阴极表面可逆形成和分解。结果，负载氮掺杂 LaNiO 催化剂的氧阴极在放电容量和循环稳定性方面表现出改善的电化学性能，有望实现实用的 Li-O 电池。
