One-dimensional porous La0.5Sr0.5CoO2.91 nanotubes as a highly efficient electrocatalyst for rechargeable lithium-oxygen batteries

Abstract The electrochemical performance of one-dimensional porous La 0.5 Sr 0.5 CoO 2.91 nanotubes as a cathode catalyst for rechargeable nonaqueous lithium-oxygen (Li-O 2 ) batteries is reported here for the first time. In this study, one-dimensional porous La 0.5 Sr 0.5 CoO 2.91 nanotubes were prepared by a simple and efficient electrospinning technique. These materials displayed an initial discharge capacity of 7205 mAh g −1 with a plateau at around 2.66 V at a current density of 100 mA g −1 . It was found that the La 0.5 Sr 0.5 CoO 2.91 nanotubes promoted both oxygen reduction and oxygen evolution reactions in alkaline media and a nonaqueous electrolyte, thereby improving the energy and coulombic efficiency of the Li-O 2 batteries. The cyclability was maintained for 85 cycles without any sharp decay under a limited discharge depth of 1000 mAh g −1 , suggesting that such a bifunctional electrocatalyst is a promising candidate for the oxygen electrode in Li-O 2 batteries.

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