Abstract
We report a systematic study of the thermal stability of Pt-based cubic, octahedral, and icosahedral nanocages using high-resolution electron microscopy coupled with in situ heating. Our results indicate that all these nanocages could be used with no observable changes up to 150 °C, with their facets still preserved at even higher temperatures. We observed the same behavior in all the nanocages under thermal stress: hole enlargement and atom migration toward the edges to create nanoframes. This transformation could be rationalized by the thermodynamic driving force to minimize surface free energy. The octahedral nanocages were found to be more stable by 50 °C than the icosahedral nanocages, suggesting that the thermal stability of such catalysts can be potentially optimized to extend their usage toward different applications at elevated temperatures.
| Original language | English |
|---|---|
| Pages (from-to) | 112-117 |
| Number of pages | 6 |
| Journal | ChemNanoMat |
| Volume | 4 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 2018 |
Funding
This work was supported in part by a grant from the NSF (CHE-1505441) and start-up funds from Georgia Tech. Part of the in situ studies were performed through a user project supported by Oak Ridge National Laboratory’s Center for Nano-phase Materials Sciences, which is a U.S. DOE Office of Science User Facility (M.C.). The remainder of the in situ studies were performed at the Georgia Tech’s Institute for Electronics and Nanotechnology (IEN), a member of the National Nanotechnology Coordinated Infrastructure, which is supported by the NSF (ECCS-1542174). This work was supported in part by a grant from the NSF (CHE-1505441) and start-up funds from Georgia Tech. Part of the in situ studies were performed through a user project supported by Oak Ridge National Laboratory's Center for Nanophase Materials Sciences, which is a U.S. DOE Office of Science User Facility (M.C.). The remainder of the in situ studies were performed at the Georgia Tech's Institute for Electronics and Nanotechnology (IEN), a member of the National Nanotechnology Coordinated Infrastructure, which is supported by the NSF (ECCS-1542174).
| Funders | Funder number |
|---|---|
| DOE Office of Science | |
| Oak Ridge National Laboratory | |
| National Science Foundation | CHE-1505441 |
| Office of Science | ECCS-1542174 |
| Oak Ridge National Laboratory |
Keywords
- in situ microscopy
- nanocages
- platinum
- thermal stability