Over-oxidation of floor ruthenium energetic websites of RuOx-based electrocatalysts results in the formation of soluble high-valent Ru species and subsequent structural collapse of electrocatalysts, which ends up in their low stability for acidic oxygen evolution response (OER). Herein, a binary RuO2/Nb2O5 electrocatalyst with considerable and intimate interfaces has been rationally designed and synthesized to boost its OER exercise in acidic electrolyte, delivering a low overpotential of 179 mV at 10 mA/cm2, a small Tafel slope of 73 mV/dec, and a stabilized catalytic sturdiness over a interval of 750 h. Intensive experiments demonstrated that the spillover of energetic oxygen intermediates from RuO2 to Nb2O5 and the next participation of lattice oxygen of Nb2O5 as a substitute of RuO2 for acidic OER supressed the over-oxidation of floor ruthenium species and thereby improved the catalytic stability of the binary electrocatalysts.
