Oxygen Bubble-Templated Hierarchical Porous ε-MnO2as a Superior Catalyst for Rechargeable Li-O2Batteries

Nickel foam-supported ε-MnO2 is synthesized through an oxygen-bubble template-assisted electrodeposition route and is applied as a new cathode catalyst for Li-O2 batteries. Owing to the 3D macro/micro/nano (multiscale) porous architecture, the prepared electrode exhibits low overpotential, high rate capability, and superior cycling durability.