A carbon-free ruthenium oxide/mesoporous titanium dioxide electrode for lithium-oxygen batteries

• RuO2 supported mesoporous TiO2 materials were synthesized by hydrothermal method.
• The Li–O2 cells using RuO2/mTiO2 cathode exhibited low polarization with high energy density.
• From the XRD and XPS results, we confirmed that TiO2-based electrodes were stable in Li–O2 batteries.

Mesoporous TiO2 with well-distributed RuO2 catalysts is considered in this paper as a carbon-free cathode material replacement. Benefiting from the highly-porous TiO2 support structure and high catalytic activity of RuO2, the Li–O2 cells with composite RuO2/mesoporous TiO2 cathodes show low charge potentials with a high cell capacity. The stability of the TiO2 materials was verified by investigating stable cell performance as well as through structural and chemical characterization via X-ray diffraction and X-ray photoelectron spectroscopy. This study demonstrates the possibility of achieving high energy at the cell level, free of carbon instability.

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