Bottom-up precise synthesis of stable platinum dimers on graphene

Huan Yan, Yue Lin, Hong Wu, Wenhua Zhang, Zhihu Sun, Hao Cheng, Wei Liu, Chunlei Wang, Junjie Li, Xiaohui Huang, Tao Yao, Jinlong Yang, Shiqiang Wei () and Junling Lu ()
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Huan Yan: University of Science and Technology of China
Yue Lin: University of Science and Technology of China
Hong Wu: University of Science and Technology of China
Wenhua Zhang: University of Science and Technology of China
Zhihu Sun: University of Science and Technology of China
Hao Cheng: University of Science and Technology of China
Wei Liu: University of Science and Technology of China
Chunlei Wang: University of Science and Technology of China
Junjie Li: University of Science and Technology of China
Xiaohui Huang: University of Science and Technology of China
Tao Yao: University of Science and Technology of China
Jinlong Yang: University of Science and Technology of China
Shiqiang Wei: University of Science and Technology of China
Junling Lu: University of Science and Technology of China

Nature Communications, 2017, vol. 8, issue 1, 1-11

Abstract: Abstract Supported metal clusters containing only a few atoms are of great interest. Progress has been made in synthesis of metal single-atom catalysts. However, precise synthesis of metal dimers on high-surface area support remains a grand challenge. Here, we show that Pt2 dimers can be fabricated with a bottom–up approach on graphene using atomic layer deposition, through proper nucleation sites creation, Pt1 single-atom deposition and attaching a secondary Pt atom selectively on the preliminary one. Scanning transmission electron microscopy, x-ray absorption spectroscopy, and theoretical calculations suggest that the Pt2 dimers are likely in the oxidized form of Pt2Ox. In hydrolytic dehydrogenation of ammonia borane, Pt2 dimers exhibit a high specific rate of 2800 molH2 molPt −1 min−1 at room temperature, ~17- and 45-fold higher than graphene supported Pt single atoms and nanoparticles, respectively. These findings open an avenue to bottom–up fabrication of supported atomically precise ultrafine metal clusters for practical applications.

Date: 2017
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DOI: 10.1038/s41467-017-01259-z

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