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Bottom-up precise synthesis of stable platinum dimers on graphene
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Journal Article
Bottom-up precise synthesis of stable platinum dimers on graphene
2017
Overview
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 Pt
2
dimers can be fabricated with a bottom–up approach on graphene using atomic layer deposition, through proper nucleation sites creation, Pt
1
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 Pt
2
dimers are likely in the oxidized form of Pt
2
O
x
. In hydrolytic dehydrogenation of ammonia borane, Pt
2
dimers exhibit a high specific rate of 2800 mol
H2
mol
Pt
−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.
Controlled fabrication of few-atoms supported catalysts is a major challenge in the synthesis of nanomaterials. Here, the authors show a bottom-up approach to precisely synthesize platinum dimers supported on graphene, which display higher catalytic activity and stability than single atoms and nanoparticles.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
