In situ coarsening study of inverse micelle-prepared Pt nanoparticles supported on -Al2O3: pretreatment and environmental effectsElectronic supplementary information (ESI) available. See DOI: 10.1039/c2cp41339f
The thermal stability of inverse micelle prepared Pt nanoparticles (NPs) supported on nanocrystalline -Al 2 O 3 was monitored in situ under different chemical environments (H 2 , O 2 , H 2 O) via extended X-ray absorption fine-structure spectroscopy (EXAFS) and ex situ via scanning transmission elec...
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Format | Journal Article |
Language | English |
Published |
25.07.2012
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Abstract | The thermal stability of inverse micelle prepared Pt nanoparticles (NPs) supported on nanocrystalline -Al
2
O
3
was monitored
in situ
under different chemical environments (H
2
, O
2
, H
2
O)
via
extended X-ray absorption fine-structure spectroscopy (EXAFS) and
ex situ via
scanning transmission electron microscopy (STEM). Drastic differences in the stability of identically synthesized NP samples were observed upon exposure to two different pre-treatments. In particular, exposure to O
2
at 400 °C before high temperature annealing in H
2
(800 °C) was found to result in the stabilization of the inverse micelle prepared Pt NPs, reaching a maximum overall size after moderate coarsening of 1 nm. Interestingly, when an analogous sample was pre-treated in H
2
at 400 °C, a final size of 5 nm was reached at 800 °C. The beneficial role of oxygen in the stabilization of small Pt NPs was also observed
in situ
during annealing treatments in O
2
at 450 °C for several hours. In particular, while NPs of 0.5 ± 0.1 nm initial average size did not display any significant sintering (0.6 ± 0.2 nm final size), an analogous thermal treatment in hydrogen leads to NP coarsening (1.2 ± 0.3 nm). The same sample pre-dosed and annealed in an atmosphere containing water only displayed moderate sintering (0.8 ± 0.3 nm). Our data suggest that PtO
x
species, possibly modifying the NP/support interface, play a role in the stabilization of small Pt NPs. Our study reveals the enhanced thermal stability of inverse micelle prepared Pt NPs and the importance of the sample pre-treatment and annealing environment in the minimization of undesired sintering processes affecting the catalytic performance of nanosized particles.
The enhanced thermal stability of Pt nanoparticles after pre-treatments in oxygen is demonstrated. Lower stability against sintering was observed in H
2
and H
2
O environments. |
---|---|
AbstractList | The thermal stability of inverse micelle prepared Pt nanoparticles (NPs) supported on nanocrystalline -Al
2
O
3
was monitored
in situ
under different chemical environments (H
2
, O
2
, H
2
O)
via
extended X-ray absorption fine-structure spectroscopy (EXAFS) and
ex situ via
scanning transmission electron microscopy (STEM). Drastic differences in the stability of identically synthesized NP samples were observed upon exposure to two different pre-treatments. In particular, exposure to O
2
at 400 °C before high temperature annealing in H
2
(800 °C) was found to result in the stabilization of the inverse micelle prepared Pt NPs, reaching a maximum overall size after moderate coarsening of 1 nm. Interestingly, when an analogous sample was pre-treated in H
2
at 400 °C, a final size of 5 nm was reached at 800 °C. The beneficial role of oxygen in the stabilization of small Pt NPs was also observed
in situ
during annealing treatments in O
2
at 450 °C for several hours. In particular, while NPs of 0.5 ± 0.1 nm initial average size did not display any significant sintering (0.6 ± 0.2 nm final size), an analogous thermal treatment in hydrogen leads to NP coarsening (1.2 ± 0.3 nm). The same sample pre-dosed and annealed in an atmosphere containing water only displayed moderate sintering (0.8 ± 0.3 nm). Our data suggest that PtO
x
species, possibly modifying the NP/support interface, play a role in the stabilization of small Pt NPs. Our study reveals the enhanced thermal stability of inverse micelle prepared Pt NPs and the importance of the sample pre-treatment and annealing environment in the minimization of undesired sintering processes affecting the catalytic performance of nanosized particles.
The enhanced thermal stability of Pt nanoparticles after pre-treatments in oxygen is demonstrated. Lower stability against sintering was observed in H
2
and H
2
O environments. |
Author | Datye, A. K Behafarid, F Croy, J. R Frenkel, A. I Matos, J DeLaRiva, A. T Mostafa, S Roldan Cuenya, B Ono, L. K |
AuthorAffiliation | Yeshiva University Department of Chemical and Nuclear Engineering University of New Mexico University of Central Florida Department of Physics |
AuthorAffiliation_xml | – name: Yeshiva University – name: University of Central Florida – name: University of New Mexico – name: Department of Chemical and Nuclear Engineering – name: Department of Physics |
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Snippet | The thermal stability of inverse micelle prepared Pt nanoparticles (NPs) supported on nanocrystalline -Al
2
O
3
was monitored
in situ
under different chemical... |
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Title | In situ coarsening study of inverse micelle-prepared Pt nanoparticles supported on -Al2O3: pretreatment and environmental effectsElectronic supplementary information (ESI) available. See DOI: 10.1039/c2cp41339f |
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