Self-catalyzed decomposition of discharge products on the oxygen vacancy sites of MoO3 nanosheets for low-overpotential Li-O2 batteries

MoO3 nanosheets with different concentration of oxygen vacancy are successfully synthesized based on a liquid-exfoliation strategy and controllable reduction reaction. The MoO3−x NSs-2 with highly mixed valence of Mo5+ and Mo6+ display the lowest overpotential with ultrastable cyclability. Self-catalyzed decomposition of the discharge products on the vacancy sites is considered as the dominant cause for enhanced performance.194