Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6609194 | Electrochimica Acta | 2016 | 9 Pages |
Abstract
To reduce the polarization at oxygen electrode of a rechargeable lithium oxygen battery, Ba0.9Co0.7Fe0.2Nb0.1O3-δ (BCFN9721) perovskite oxide was prepared and applied as a bi-functional electro-catalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Lithium oxygen battery with an oxygen electrode composed of 80% Ketjen Black (KB) and 20% BCFN9721 delivered a discharge voltage plateau of 2.63 V, which is the highest among different composition ratios of KB and BCFN9721 in the oxygen electrodes. Adding 20% BCFN9721 into KB could effectively reduce the polarization and achieve better bi-functional activities for the electrochemical reactions at positive electrode, especially for the OER. The lithium oxygen battery using BCFN9721 perovskite oxide as the electro-catalyst could run stably for 24 discharge/charge cycles with a fixed capacity of 1000 mAh gâ1electrode. The charge polarization could be significantly reduced by BCFN9721 catalyst, thus alleviating the formation of undesired discharge products caused by the corrosion of carbon and decomposition of the electrolyte. Ba0.9Co0.7Fe0.2Nb0.1O3-δ perovskite oxide can be a promising bi-functional electro-catalyst for the oxygen electrode of rechargeable lithium oxygen batteries.
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Authors
Qinhong Xu, Shidong Song, Yining Zhang, Yan Wang, Jimei Zhang, Yanli Ruan, Minfang Han,