Facile mass production of self-supported two-dimensional transition metal oxides for catalytic applications.

We report a novel metal-corrosion route beyond traditional top-down or bottom-up strategies for the mass production of 2D TMOs with a self-supported structure. The self-supported 2D Co3O4, a typical TMO, exhibits excellent electrocatalytic activity and stability in the oxygen evolution reaction surpassing those of commercial precious metal RuO2 catalysts at high currents.