Carbon-Free O2 Cathode with Three-Dimensional Ultralight Nickel Foam-Supported Ruthenium Electrocatalysts for Li-O2 Batteries.

A new carbon- and binder-free O2 cathode was fabricated by electroplating Ru-nanoparticle-coated ultralight Ni foam, which has good electron-conducting and electrocatalytic properties. This all-metal monolithic structure was able to suppress CO2 evolution and provided 306 times higher capacity than commercial Ni foam-based O2 cathodes.