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Heterostructured Mo2C–MoO2 as highly efficient catalyst for rechargeable Li–O2 battery

Journal Article


Abstract


  • © 2020 Elsevier B.V. Li–O2 batteries has been widely investigated for its ultra-high capacity as next generation batteries. Nevertheless, some problems like sluggish kinetic reaction and instability hugely impede the practical use of Li–O2 batteries. In this work, Mo2C/MoO2@RGO heterostructures was fabricated by in-situ growth of Mo2C between MoO2 and RGO during calcination and being employed as cathode to explore the synergistic effect in Li–O2 batteries. As a result, Mo2C/MoO2@RGO exhibits good specific capacity with 2365 mAh g−1, high round-trip efficiency (89% at first cycle) and improved cycling performance. Density functional theory calculations indicated that the Mo2C/MoO2@RGO heterostructures have better capability of oxygen adsorption than sole constituent (Mo2C@RGO or MoO2@RGO), which triggers the formation of film-like amorphous discharge products, leading to lower overpotential and stable performance. Our study reveals the important role of heterostructures in Li–O2 batteries system and demonstrates a promising design strategy for heterostructured catalyst.

Authors


  •   Wu, Chang (external author)
  •   Hou, Yuyang (external author)
  •   Jiang, Jicheng (external author)
  •   Guo, Haipeng (external author)
  •   Liu, Hua K.
  •   Chen, Jun
  •   Wang, Jiazhao

Publication Date


  • 2020

Citation


  • Wu, C., Hou, Y., Jiang, J., Guo, H., Liu, H., Chen, J. & Wang, J. (2020). Heterostructured Mo2C–MoO2 as highly efficient catalyst for rechargeable Li–O2 battery. Journal of Power Sources,

Scopus Eid


  • 2-s2.0-85085326188

Place Of Publication


  • Netherlands

Abstract


  • © 2020 Elsevier B.V. Li–O2 batteries has been widely investigated for its ultra-high capacity as next generation batteries. Nevertheless, some problems like sluggish kinetic reaction and instability hugely impede the practical use of Li–O2 batteries. In this work, Mo2C/MoO2@RGO heterostructures was fabricated by in-situ growth of Mo2C between MoO2 and RGO during calcination and being employed as cathode to explore the synergistic effect in Li–O2 batteries. As a result, Mo2C/MoO2@RGO exhibits good specific capacity with 2365 mAh g−1, high round-trip efficiency (89% at first cycle) and improved cycling performance. Density functional theory calculations indicated that the Mo2C/MoO2@RGO heterostructures have better capability of oxygen adsorption than sole constituent (Mo2C@RGO or MoO2@RGO), which triggers the formation of film-like amorphous discharge products, leading to lower overpotential and stable performance. Our study reveals the important role of heterostructures in Li–O2 batteries system and demonstrates a promising design strategy for heterostructured catalyst.

Authors


  •   Wu, Chang (external author)
  •   Hou, Yuyang (external author)
  •   Jiang, Jicheng (external author)
  •   Guo, Haipeng (external author)
  •   Liu, Hua K.
  •   Chen, Jun
  •   Wang, Jiazhao

Publication Date


  • 2020

Citation


  • Wu, C., Hou, Y., Jiang, J., Guo, H., Liu, H., Chen, J. & Wang, J. (2020). Heterostructured Mo2C–MoO2 as highly efficient catalyst for rechargeable Li–O2 battery. Journal of Power Sources,

Scopus Eid


  • 2-s2.0-85085326188

Place Of Publication


  • Netherlands