Solving the Structure of Size-Selected Pt Nanocatalysts Synthesized by Inverse 
Micelle Encapsulation

Roldan Cuenya, Beatriz; Croy, Jason R.; Mostafa, Simon; Behafarid, Farzad; Li, Long; Zhang, Zhongfan; Yang, Judith C.; Wang, Qi; Frenkel, Anatoly I.

doi:10.1021/ja101997z

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Solving the Structure of Size-Selected Pt Nanocatalysts Synthesized by Inverse Micelle Encapsulation

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Roldan Cuenya, B., Croy, J. R., Mostafa, S., Behafarid, F., Li, L., Zhang, Z., et al. (2010). Solving the Structure of Size-Selected Pt Nanocatalysts Synthesized by Inverse Micelle Encapsulation. Journal of the American Chemical Society, 132(25), 8747-8756. doi:10.1021/ja101997z.

Cite as: https://hdl.handle.net/21.11116/0000-0006-D223-5

Abstract

The structure, size, and shape of γ-Al₂O₃-supported Pt nanoparticles (NPs) synthesized by inverse micelle encapsulation have been resolved via a synergistic combination of imaging and spectroscopic tools. It is shown that this synthesis method leads to 3D NP shapes even for subnanometer clusters, in contrast to the raft-like structures obtained for the same systems via traditional deposition-precipitation methods. Furthermore, a high degree of atomic ordering is observed for the micellar NPs in H₂ atmosphere at all sizes studied, possibly due to H-induced surface reconstruction in these high surface area clusters. Our findings demonstrate that the influence of NP/support interactions on NP structure can be diminished in favor of NP/adsorbate interactions when NP catalysts are prepared by micelle encapsulation methods.