Ru mixed oxides are the most active catalysts for the oxygen evolution reaction (OER) in acid electrolyte. However, their stability is seriously compromised during the reaction. In this work we show that it is possible to enhance both OER activity and durability of SrRuO₃ mixed oxide by the partial doping with K⁺ in Sr²⁺ sites. Sr_1-xK_xRuO₃ perovskites (x = 0.00, 0.05, 0.10 and 0.20) have been synthesized by wet chemistry. The partial doping with K⁺ cations led to oxides with Ru atoms in a higher oxidation state. In addition, K-doping resulted in perovskites with slightly higher symmetry. The performance of the K-doped perovskites for the OER was assessed in acid electrolyte. Clearly, the K-doped materials, especially Sr_0.80K_0.20RuO₃, display higher activity (lower E₁₀) and significantly higher durability than the undoped sample SrRuO₃. The results indicate that chemical modifications on Ru perovskites can be a suitable strategy to improve the stability of Ru phases during the OER.

Ru 混合氧化物是酸性电解质中析氧反应 (OER) 最活跃的催化剂。然而，它们的稳定性在反应过程中受到严重损害。在这项工作中，我们表明可以通过在 Sr ²⁺位点部分掺杂 K ⁺来提高 SrRuO ₃混合氧化物的OER 活性和耐久性。 已经通过湿化学合成了Sr _1-x K _x RuO ₃钙钛矿（x = 0.00、0.05、0.10 和 0.20）。部分掺杂 K ⁺阳离子导致具有更高氧化态的 Ru 原子的氧化物。此外，K 掺杂导致钙钛矿具有稍高的对称性。在酸性电解质中评估了 K 掺杂钙钛矿的 OER 性能。显然，掺钾材料，尤其是 Sr _0.80 K _0.20 RuO ₃，显示出比未掺杂样品 SrRuO ₃更高的活性（更低的 E ₁₀）和显着更高的耐久性。结果表明，对 Ru 钙钛矿进行化学修饰是提高 OER 过程中 Ru 相稳定性的合适策略。