| DOI码： | 10.1002/anie.202212341 |
| 发表刊物： | Angew Chem Int Ed Engl |
| 摘要： | Catalyst/support interaction plays a vital role in catalysis towards acidic oxygen evolution (OER), and the performance reinforcement is currently interpreted by either strain or electron donation effect. We herein report that these views are insufficient, where the dynamic evolution of the interface under potential bias must be considered. Taking Nb 2 O 5?x supported iridium (Ir/Nb 2 O 5?x ) as a model catalyst, we uncovered the dynamic migration of oxygen species between IrO x and Nb2O5-x during OER. Direct spectroscopic evidence combined with theoretical computation suggests these migrations not only regulate the in situ Ir structure towards boosted activity, but also suppress its overoxidation via spontaneously delivering excessive oxygen from IrOx to Nb2O5-x. The optimized Ir/Nb2O5-x thus demonstrated exceptional performance in scalable water electrolyzers, i.e., only need 1.839 V to attain 3 A cm-2 (surpassing the DOE 2025 target), and no activity decay during a 2000 h test at 2 A cm-2. |
| 论文类型： | 期刊论文 |
| 卷号： | 61 |
| 页面范围： | e202212341 |
| 是否译文： | 否 |
| 发表时间： | 2022-10-13 |
访问量：
开通时间：--
最后更新时间：--
