Influence of TiO2 structure on metal-support interactions in Rh/TiO2 catalysts probed by propylene hydrogenation and other techniques
- PAR ID:
- 10504862
- Publisher / Repository:
- Applied Surface Science
- Date Published:
- Journal Name:
- Applied Surface Science
- Volume:
- 654
- Issue:
- C
- ISSN:
- 0169-4332
- Page Range / eLocation ID:
- 159389
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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Understanding of structural and morphological evolution in nanomaterials is critical in tailoring their functionality for applications such as energy conversion and storage. Here, we examine irradiation effects on the morphology and structure of amorphous TiO2 nanotubes in comparison with their crystalline counterpart, anatase TiO2 nanotubes, using high-resolution transmission electron microscopy (TEM), in situ ion irradiation TEM, and molecular dynamics (MD) simulations. Anatase TiO2 nanotubes exhibit morphological and structural stability under irradiation due to their high concentration of grain boundaries and surfaces as defect sinks. On the other hand, amorphous TiO2 nanotubes undergo irradiation-induced crystallization, with some tubes remaining only partially crystallized. The partially crystalline tubes bend due to internal stresses associated with densification during crystallization as suggested by MD calculations. These results present a novel irradiation-based pathway for potentially tuning structure and morphology of energy storage materials.more » « less
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