Optical field modulation for enhanced ORR and OER activity in Li–O2 batteries based on 2D porous Co3O4 nanosheets

Abstract

The photo-assisted strategy is viewed as a promising method to improve the ORR and OER performance of Li–O₂ batteries. Nevertheless, designing a photocatalyst that ensures wide light absorption and minimizes the recombination of photoinduced electrons and holes is still a notable challenge. In this study, 2D porous Co₃O₄ nanosheets are synthesized as photocatalysts for photo-assisted Li–O₂ batteries. Their unique structure improves surface area, facilitates O₂ transport, and stores discharge products. Equally, the Co₃O₄ nanosheets exhibit strong light responsiveness and photocatalytic activity. Upon optical field, photoinduced electrons and holes are successfully separated on Co₃O₄ nanosheets, which promotes the formation and decomposition of Li₂O₂, respectively. Li–O₂ cells using Co₃O₄ nanosheets display a low overpotential of 0.15 V and good cycling stability under optical field. These findings highlight the potential of Co₃O₄ nanosheets as photocatalysts for photo-assisted Li–O₂ batteries, providing a foundation for future energy storage advancements.