Syntheses of Water-Soluble
Octahedral, Truncated Octahedral,
and Cubic Pt–Ni Nanocrystals and Their Structure–Activity
Study in Model Hydrogenation Reactions
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Abstract
We developed a facile strategy to synthesize a series
of water-soluble
Pt, Pt<sub><i>x</i></sub>Ni<sub>1‑<i>x</i></sub> (0 < <i>x </i>< 1), and Ni nanocrystals. The octahedral,
truncated octahedral, and cubic shapes were uniformly controlled by
varying crystal growth inhibition agents such as benzoic acid, aniline,
and carbon monoxide. The compositions of the Pt<sub><i>x</i></sub>Ni<sub>1‑<i>x</i></sub> nanocrystals were effectively
controlled by choice of ratios between the Pt and Ni precursors. In
a preliminary study to probe their structure–activity dependence,
we found that the shapes, compositions, and capping agents strongly
influence the catalyst performances in three model heterogeneous hydrogenation
reactions