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<p>Aprotic lithium-oxygen (Li-O<sub>2</sub>) batteries are severely limited by slow cathode reaction kinetics and large polarization. Herein, we design and prepare a Mott-Schottky catalyst by uniformly embedding ultrafine Ru nanoparticles on the nitrogen-doped carbon (Ru@NC) nanoflakes to accelerate oxygen redox kinetics of Li-O<sub>2</sub> batteries. The Mott-Schottky effect of Ru@NC drives the spontaneous electron rearrangement in the NC matrix and induces a strong built-in electric field at heterointerfaces, which accelerates the activation and conversion of oxygen intermediates. The obtained Ru@NC possesses rich Mott-Schottky heterointerfaces and defective carbon structures, which provide extensive adsorption and nucleation sites. More importantly, Ru@NC manifests moderate affinity for the intermediate LiO<sub>2</sub>, inducing formation of unique nanosheet-like Li<sub>2</sub>O<sub>2</sub> with low Li<sub>2</sub>O<sub>2</sub>/cathode interfacial impedance, which further enhances oxidation kinetics. These enable the Li-O<sub>2</sub> battery with Ru@NC to deliver a remarkably reduced polarization of 0.89 V, superior rate performance, and prolonged lifespan of over 200 cycles. This work will provide valuable guidelines for engineering advanced electrocatalysts for high-performance Li-O<sub>2</sub> batteries and beyond.</p>

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Interfacial charge redistribution in ultrafine ruthenium nanoparticle-decorated N-modified carbon catalysts accelerates oxygen redox for lithium-oxygen batteries

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Yajing Li,
  • Yinjing Sun,
  • Xueyun Yang,
  • Yingli Wang,
  • Caixia Li,
  • Haojie Liang,
  • Xianxian Shi,
  • Lei Wang,
  • Qingliang Lv

摘要

Aprotic lithium-oxygen (Li-O2) batteries are severely limited by slow cathode reaction kinetics and large polarization. Herein, we design and prepare a Mott-Schottky catalyst by uniformly embedding ultrafine Ru nanoparticles on the nitrogen-doped carbon (Ru@NC) nanoflakes to accelerate oxygen redox kinetics of Li-O2 batteries. The Mott-Schottky effect of Ru@NC drives the spontaneous electron rearrangement in the NC matrix and induces a strong built-in electric field at heterointerfaces, which accelerates the activation and conversion of oxygen intermediates. The obtained Ru@NC possesses rich Mott-Schottky heterointerfaces and defective carbon structures, which provide extensive adsorption and nucleation sites. More importantly, Ru@NC manifests moderate affinity for the intermediate LiO2, inducing formation of unique nanosheet-like Li2O2 with low Li2O2/cathode interfacial impedance, which further enhances oxidation kinetics. These enable the Li-O2 battery with Ru@NC to deliver a remarkably reduced polarization of 0.89 V, superior rate performance, and prolonged lifespan of over 200 cycles. This work will provide valuable guidelines for engineering advanced electrocatalysts for high-performance Li-O2 batteries and beyond.