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

Pengfa Li, Jiakai Zhang, Qilin Yu, Jinshuo Qiao, Zhenhua Wang, David Rooney, Wang Sun*, Kening Sun

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The electrochemical performance of one-dimensional porous La0.5Sr0.5CoO2.91 nanotubes as a cathode catalyst for rechargeable nonaqueous lithium-oxygen (Li-O2) batteries is reported here for the first time. In this study, one-dimensional porous La0.5Sr0.5CoO2.91 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 La0.5Sr0.5CoO2.91 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-O2 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-O2 batteries.

Original languageEnglish
Pages (from-to)78-84
Number of pages7
JournalElectrochimica Acta
Volume165
Early online date03 Mar 2015
DOIs
Publication statusPublished - 20 May 2015

Keywords

  • Electrocatalyst
  • LaSrCoO nanotubes
  • Lithium-oxygen battery
  • Oxygen electrode

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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