The oxygen evolution reaction (OER) constitutes a critical bottleneck in water electrolysis for hydrogen production owing to its sluggish four-electron transfer kinetics. Double perovskite oxides (A2BB’O6) have emerged as exceptional OER catalysts distinguished by their stable crystal frameworks and flexible active-site tunability. Crucially, the alternating ordering of B and B’ cations at octahedral positions creates a unique lattice enriched with oxygen vacancies. Leveraging these intrinsic structural advantages, we synthesized a porous Ru-doped double perovskite oxide Sr2Fe1.9Ru0.1O6-δ (SFRO-850) featuring increased oxygen vacancies via a sol–gel route. Electrochemical measurement shows that SFRO-850 exhibits outstanding OER activity with a low overpotential of 326 mV at a current density of 10 mA cm−2 and a Tafel slope of 67.48 mV dec−1, superior to the undoped material and its counterparts. The results validate the efficacy of the double perovskite framework as a superior platform for hosting catalytically active sites, offering a viable pathway toward high-performance, low-noble-metal-content OER catalysts.
Wang et al. (Fri,) studied this question.