Abstract
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 SrRuO 3 mixed oxide by the partial doping with K + in Sr 2+ sites. Sr 1-x K x RuO 3 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 0.80 K 0.20 RuO 3 , display higher activity (lower E 10 ) and significantly higher durability than the undoped sample SrRuO 3 . The results indicate that chemical modifications on Ru perovskites can be a suitable strategy to improve the stability of Ru phases during the OER. • Sr 1-x K x RuO 3 display high OER activity for the OER in acid electrolyte. • Replacing Sr 2+ by K + increases perovskite durability and stability during the OER. • K + doping modifies crystallographic symmetry and Ru oxidation state of SrRuO 3 .
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