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Hierarchical Ru nanospheres as highly effective cathode catalysts for Li-O2 batteries

Journal Article


Abstract


  • Carbon-free, hierarchical Ru nanospheres are reported as an effective cathode catalyst for Li-O2 batteries. The hierarchical Ru nanospheres were synthesized by a simple one-step hydrothermal method. As evaluated by electrochemical measurements, it was found that the carbon-free hierarchical Ru nanosphere cathode can significantly reduce discharge and charge overpotential (∼0.3 V with the capacity limited to 1000 mA h g-1) with a high discharge capacity of 3445 mA h g-1 at a current density of 200 mA g-1 (ORR). This superior oxygen evolution reaction (OER) and oxygen reduction reaction catalytic performance can be maintained over long time cycling at different current densities. Ex situ scanning electron microscopy, X-ray diffraction, and Raman measurements reveal that leaf-shaped Li2O2 is the only reaction product during the discharge process, and the hierarchical Ru nanospheres can effectively decompose the Li2O2 discharge product, facilitate the OER, and promote a high round-trip efficiency. Therefore, the carbon-free hierarchical Ru nanospheres are a promising cathode catalyst for rechargeable Li-O2 batteries with low charge overpotential, long cycle life, and high specific capacity.

Authors


  •   Su, Dawei (external author)
  •   Dou, Shi Xue
  •   Wang, Guoxiu

Publication Date


  • 2015

Citation


  • Su, D. W., Dou, S. X. & Wang, G. X. (2015). Hierarchical Ru nanospheres as highly effective cathode catalysts for Li-O2 batteries. Journal of Materials Chemistry A, 3 (36), 18384-18388.

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1587

Number Of Pages


  • 4

Start Page


  • 18384

End Page


  • 18388

Volume


  • 3

Issue


  • 36

Abstract


  • Carbon-free, hierarchical Ru nanospheres are reported as an effective cathode catalyst for Li-O2 batteries. The hierarchical Ru nanospheres were synthesized by a simple one-step hydrothermal method. As evaluated by electrochemical measurements, it was found that the carbon-free hierarchical Ru nanosphere cathode can significantly reduce discharge and charge overpotential (∼0.3 V with the capacity limited to 1000 mA h g-1) with a high discharge capacity of 3445 mA h g-1 at a current density of 200 mA g-1 (ORR). This superior oxygen evolution reaction (OER) and oxygen reduction reaction catalytic performance can be maintained over long time cycling at different current densities. Ex situ scanning electron microscopy, X-ray diffraction, and Raman measurements reveal that leaf-shaped Li2O2 is the only reaction product during the discharge process, and the hierarchical Ru nanospheres can effectively decompose the Li2O2 discharge product, facilitate the OER, and promote a high round-trip efficiency. Therefore, the carbon-free hierarchical Ru nanospheres are a promising cathode catalyst for rechargeable Li-O2 batteries with low charge overpotential, long cycle life, and high specific capacity.

Authors


  •   Su, Dawei (external author)
  •   Dou, Shi Xue
  •   Wang, Guoxiu

Publication Date


  • 2015

Citation


  • Su, D. W., Dou, S. X. & Wang, G. X. (2015). Hierarchical Ru nanospheres as highly effective cathode catalysts for Li-O2 batteries. Journal of Materials Chemistry A, 3 (36), 18384-18388.

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1587

Number Of Pages


  • 4

Start Page


  • 18384

End Page


  • 18388

Volume


  • 3

Issue


  • 36