Cu₂O–Cu Hybrid Foams as High-Performance Electrocatalysts for Oxygen Evolution Reaction in Alkaline Media

Here 3D Cu 2 O–Cu hybrid foams are developed as high-performance electrocatalysts for OER in alkaline solution. The hybrid foams are composed of Cu 2 O–Cu dendrites with high surface area and high-speed electronic transmission networks, and they can provide fast transportation and short diffusion path for electrolyte and evolved O 2 bubbles. As the special surface and structure effects, the Cu 2 O–Cu hybrid foams exhibit low onset overpotential of ∼250 mV, small Tafel slope of 67.52 mV dec –1, and high durability over 50 h at a current density of 10 mA cm –2 for OER in alkaline solution. The results of this study may be particularly beneficial for the development of a type of hybrid porous foam electrocatalysts for the electrochemical process in which at least one gas-phase is involved, such as H 2 or O 2 evolution reaction and O 2 or CO 2 electroreduction reaction.