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

• Published in: ACS applied materials & interfaces Vol. 15; no. 51; pp. 59432 - 59443
• Main Authors: Wang, Simeng, Zang, Jianyang, Shi, Weili, Zhou, Dinghua, Jia, Yufei, Wu, Jingpin, Yan, Weihong, Zhang, Biaobiao, Sun, Licheng, Fan, Ke
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 27.12.2023
• Subjects: Energy, Environmental, and Catalysis Applications; IrRu oxides; spectroelectrochemistry; W doping; acidic OER; stability
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.3c13619

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 IrO2 and RuO2. 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 IrRu3O x (W-IrRu3O 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-IrRu3O x . The dual role of W in promoting the formation of active site Ir5+ 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-IrRu3O x exhibits outstanding catalytic activity for the OER in 0.5 M H2SO4, 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.