催化作用
金属
Atom(片上系统)
电化学
氧气
化学
吸附
氢氧化物
析氧
光化学
材料科学
无机化学
物理化学
电极
嵌入式系统
有机化学
生物化学
计算机科学
作者
Jie Wei,Hua Tang,Li Sheng,Ruyang Wang,Minghui Fan,Jiale Wan,Yuheng Wu,Zhirong Zhang,Shiming Zhou,Jie Zeng
标识
DOI:10.1038/s41467-024-44815-0
摘要
Abstract The metal-support interactions (MSI) could greatly determine the electronic properties of single-atom catalysts, thus affecting the catalytic performance. However, the typical approach to regulating MSI usually suffers from interference of the variation of supports or sacrificing the stability of catalysts. Here, we effectively regulate the site-specific MSI of Ir single atoms anchored on Ni layered double hydroxide through an electrochemical deposition strategy. Cathodic deposition drives Ir atoms to locate at three-fold facial center cubic hollow sites with strong MSI, while anodic deposition drives Ir atoms to deposit onto oxygen vacancy sites with weak MSI. The mass activity and intrinsic activity of Ir single-atom catalysts with strong MSI towards oxygen evolution reaction are 19.5 and 5.2 times that with weak MSI, respectively. Mechanism study reveals that the strong MSI between Ir atoms and the support stimulates the activity of Ir sites by inducing the switch of active sites from Ni sites to Ir sites and optimizes the adsorption strength of intermediates, thereby enhancing the activity.
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