Simultaneously Improved Activity and Stability for Acidic Water Oxidation of IrRu Oxides by a Dual Role of Tungsten Doping.

Acidic oxygen evolution reaction (OER) remains a significant challenge due to the low activity and/or poor stability of the catalysts, even with state-of-the-art catalysts such as IrO 2 and RuO 2 . Herein, we propose a strategy to enhance both the catalytic activity and stability of IrRu oxides for acidic OER by doping non-noble metal W. The W-doped IrRu 3 O x (W-IrRu 3 O x ) undergoes a process of W leaching and reconstruction during the OER, leading to a more uniform distribution of elements, while the electronegative nature of W influences the electronic structures of Ir and Ru in W-IrRu 3 O x . The dual role of W in promoting the formation of active site Ir 5+ and inhibiting the concentration of soluble Ru >4+ ions results in a synergistic enhancement of both the activity and stability of acidic OER. Remarkably, W-IrRu 3 O x exhibits outstanding catalytic activity for the OER in 0.5 M H 2 SO 4 , with a high stability of more than 500 h. This work presents a novel and feasible strategy for the development of efficient and stable catalysts for acid OER, shedding light on the design of advanced electrocatalysts for energy conversion and storage applications.