Site-specific metal-support interaction to switch the activity of Ir single atoms for oxygen evolution reaction

Jie Wei, Hua Tang, Li Sheng, Ruyang Wang, Minghui Fan, Jiale Wan, Yuheng Wu, Zhirong Zhang (), Shiming Zhou and Jie Zeng ()
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Jie Wei: University of Science and Technology of China
Hua Tang: University of Science and Technology of China
Li Sheng: University of Science and Technology of China
Ruyang Wang: University of Science and Technology of China
Minghui Fan: University of Science and Technology of China
Jiale Wan: University of Science and Technology of China
Yuheng Wu: University of Science and Technology of China
Zhirong Zhang: University of Science and Technology of China
Shiming Zhou: University of Science and Technology of China
Jie Zeng: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-44815-0

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