Oxygen vacancy-rich defective Co 3 O 4 –RuO 2 heterostructure catalysts for efficient acidic oxygen evolution reaction

This study develops a Co₃O₄-RuO₂ heterojunction catalyst for the acidic oxygen evolution reaction (OER). The presence of oxygen vacancies at the heterointerface, along with the electronic coupling synergistically enhances OER activity. This results in a low overpotential of 218 mV at 10 mA cm^-2, demonstrating its potential for efficient hydrogen production through proton exchange membrane water electrolysis.