Rationalizing Acidic Oxygen Evolution Reaction over IrO2: Essential Role of Hydronium Cation

被引：2
作者：
Mou, Tianyou [1 ]
Bushiri, Daniela A. [2 ]
Esposito, Daniel V. [2 ]
Chen, Jingguang G. [1 ,2 ]
Liu, Ping [1 ]
机构：
[1] Brookhaven Natl Lab, Chem Div, Upton, NY 11973 USA
[2] Columbia Univ, Dept Chem Engn, New York, NY 10027 USA
来源：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2024年 / 63卷 / 48期
基金：
美国国家科学基金会;
关键词：
oxygen evolution reaction (OER); density functional theory (DFT); acid solution; IrO2;
D O I：
10.1002/anie.202409526
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The development of active, stable, and more affordable electrocatalysts for acidic oxygen evolution reaction (OER) is of great importance for the practical application of electrolyzers and the advancement of renewable energy conversion technologies. Currently, IrO2 is the only catalyst with high stability and activity, but a high cost. Further optimization of the catalyst is limited by the lack of understanding of catalytic behaviors at the acid-IrO2 interface. Here, in strong interaction with the experiment, we develop an explicit model based on grand-canonical density function theory (GC-DFT) calculations to describe acidic OER over IrO2. Compared to the explicit models reported previously, hydronium cations (H3O+) are introduced at the electrochemical interface in the current model. As a result, a variation in stable IrO2 surface configuration under the OER operating condition from previously proposed complete *O-coverage to a mixture coverage of *OH and *O is revealed, which is well supported by in situ Raman measurements. In addition, the accuracy of predicted overpotential is increased in comparison with the experimentally measured. More importantly, an alteration of the potential limiting step from previously identified *O ->*OOH to *OH ->*O is observed, which opens new opportunities to advance the IrO2-based catalysts for acidic OER.
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页数：9
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