Re/Ag Comodulated MnO ₂ for Highly Active and Durable Oxygen Evolution in Acidic Solution

Rutile-type MnO 2 for the oxygen evolution reaction (OER) in acidic media suffers from poor electrocatalytic activity and low durability owing to the poor conductivity and peroxidation. Here, a facile pyrolysis method is employed to successfully fabricate rhenium (Re)- and silver (Ag)-incorporated MnO 2 (ReAg-MnO 2 ) loaded on a substrate of a corrosion-resistant Ti plate with an interlayer of Sb-doped SnO 2 (Sb–SnO 2 ). The ReAg-MnO 2 anode achieves a low overpotential of 315 mV at a current density of 10 mA cm –2 and a small Tafel slope of 55.7 mV dec –1, displaying an ultrahigh durability of over 500 h at a large current density of 200 mA cm –2 . The incorporation of Re and Ag in the MnO 2 bulk reasonably modulates the electronic structure and favorably suppresses the peroxidation of Mn sites during the acidic OER. This work provides a new strategy for the practical application of nonprecious MnO 2 -based electrocatalysts in the electrochemical industry for acidic OER.