posted on 2023-12-18, 11:03authored bySimeng Wang, Jianyang Zang, Weili Shi, Dinghua Zhou, Yufei Jia, Jingpin Wu, Weihong Yan, Biaobiao Zhang, Licheng Sun, Ke Fan
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 IrRu3Ox (W-IrRu3Ox) 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-IrRu3Ox. 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-IrRu3Ox 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.