A 3D-printed freestanding graphene aerogel composite photocathode for high-capacity and long-life photo-assisted Li-O batteries.

The construction of a high-performance photocathode is essential for improving Li-O battery performance and solar energy utilization. However, the single pore and few active reaction sites of the photocathode result in insufficient discharge capacity and unsatisfactory cycling durability. Herein, we designed and fabricated a self-standing 3D-printed multi-pore graphene-based photocathode direct ink writing (DIW) featuring non-competitive three-phase transmission channels to promote the transport of Li, e, and O.