Tailored Plasmonic Ru/O V -MoO 2 on TiO 2 Catalysts via Solid-Phase Interface Engineering: Toward Highly Efficient Photoassisted Li-O 2 Batteries with Enhanced Cycling Reliability.

The photoassisted electrochemical reactions are considered an effective method to reduce the overpotential of Li-O 2 batteries. However, achieving long-term cell cycling stability remains a challenge. Here, we report a solid-phase interfacial reaction (SPIR) strategy that introduces both oxygen vacancies (O V ) and metal centers (Ru) into the MoO 2 to synthesize the surface plasmon (i.e., Ru/O V -MoO 2 ). Then, Ru/O V -MoO 2 can be uniformly loaded on the TiO 2 nanowires by the hydrothermal method. The plasma effect of Ru/O V -MoO 2 demonstrates the effective reduction of the photoexcited electron and hole recombination to improve visible light-harvesting ability. The lifetime of electrons and holes can be extended by Ru nanoparticles, which is beneficial for promoting the formation and decomposition of Li 2 O 2 . In addition, the generated O V further enhanced the migration of electrons and Li + , thus improving the ORR performance. The Ru/O V -MT/CC cathode corroborates excellent stability and catalytic performance in the photoassisted Li-O 2 battery, with an overpotential value of 0.47 V, achieving the highest energy efficiency of 93.94%, retaining at 89.13% after 800 h. This work offers a platform for preparing a stable, bifunctional catalyst with the high total activity of a photoassisted Li-O 2 battery.