4.8 Article

Monodispersed Ruthenium Nanoparticles on Nitrogen-Doped Reduced Graphene Oxide for an Efficient Lithium-Oxygen Battery

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 17, Pages 19915-19926

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c23125

Keywords

ruthenium nanoparticles; nitrogen-doped graphene oxide; metal-support interaction; cathode catalysts; Li-O-2 battery

Funding

  1. Singapore MOE [R143-000-A29-112]
  2. China Scholarship Council

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This study synthesized ruthenium nanoparticles anchored on nitrogen-doped reduced graphene oxide as a bifunctional catalyst for lithium-oxygen batteries, which significantly improved the electrochemical performance with increased discharge capacity, decreased charge overpotential, and long-term cyclability. The findings highlight the importance of dispersion and coordination of metal catalysts in the rational design of efficient catalysts for future lithium-oxygen batteries.
Lithium-oxygen batteries with ultrahigh energy densities have drawn considerable attention as next-generation energy storage devices. However, their practical applications are challenged by sluggish reaction kinetics aimed at the formation/decomposition of discharge products on battery cathodes. Developing effective catalysts and understanding the fundamental catalytic mechanism are vital to improve the electrochemical performance of lithium-oxygen batteries. Here, uniformly dispersed ruthenium nanoparticles anchored on nitrogen-doped reduced graphene oxide are prepared by using an in situ pyrolysis procedure as a bifunctional catalyst for lithium-oxygen batteries. The abundance of ruthenium active sites and strong ruthenium-support interaction enable a feasible discharge product formation/decomposition route by modulating the surface adsorption of lithium superoxide intermediates and the nucleation and growth of lithium peroxide species. Benefiting from these merits, the electrode provides a drastically increased discharge capacity (17,074 mA h g(-1)), a decreased charge overpotential (0.51 V), and a long-term cyclability (100 cycles at 100 mA g(-1)). Our observations reveal the significance of the dispersion and coordination of metal catalysts, shedding light on the rational design of efficient catalysts for future lithium-oxygen batteries.

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