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Morphology and CO Oxidation Activity of Pd Nanoparticles on SrTiO 3 Nanopolyhedra
| Content Provider | United States Department of Energy Office of Scientific and Technical Information (OSTI.GOV) |
|---|---|
| Author | Chen, Bor-Rong Crosby, Lawrence A. George, Cassandra Kennedy, Robert M. Schweitzer, Neil M. Wen, Jianguo Van Duyne, Richard P. Stair, Peter C. Poeppelmeier, Kenneth R. Marks, Laurence D. Bedzyk, Michael J. |
| Organization | Argonne National Lab. (ANL), Argonne, IL (United States) |
| Abstract | Single crystal SrTiO3 nanocuboids having primarily TiO2-(001) surfaces and nanododecahedra having primarily (110) surfaces were created by two separate hydrothermal synthesis processes. Pd nanoparticles grown on the two sets of STO nanopolyhedra by atomic layer deposition show different morphologies and CO oxidation performance. Transmission electron microscopy and small-angle X-ray scattering show that 2-3 nm Pd nanoparticles with 3-5 nm interparticle distances decorate the STO surfaces. When the number of ALD cycles increases, the growth of the Pd nanoparticles is more significant in size on TiO2-(001)-STO surfaces, while that on (110)-STO surfaces is more predominant in number. High resolution electron microscopy images show that single crystal and multiply twinned Pd nanoparticles coexist on both types of the STO nanopolyhedra and exhibit different degrees of adhesion. The CO oxidation reaction, which was employed to determine the dependence of catalytic activity, demonstrated that the Pd catalytic performance was dominated by the coverage of CO, which is more directly related to Pd nanoparticle size than to shape. CO turnover frequency analysis and diffuse reflectance infrared Fourier transform spectroscopy show that regardless of the shape or degrees of wetting, larger Pd nanoparticles (~ 3 nm) have lower catalytic activity due to high CO coverage on nanoparticle facets. Smaller nanoparticles (~ 2 nm) have more edge and corner sites and present 2-3 times higher TOF at 80 and 100 degrees C. |
| Sponsorship | USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22) |
| Related Links | https://www.osti.gov/biblio/1508635 |
| Starting Page | 4751 |
| Ending Page | 4760 |
| Page Count | 10 |
| File Format | |
| ISSN | 21555435 |
| DOI | 10.1021/acscatal.7b04173 |
| Journal | ACS Catalysis |
| Volume Number | 8 |
| Issue Number | 6 |
| Language | English |
| Publisher | American Chemical Society (ACS) |
| Publisher Date | 2018-04-16 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY CO oxidation X-ray absorption near edge structure X-ray small angle scattering atomic layer deposition diffuse reflectance infrared Fourier transform spectroscopy heterogeneous catalysts palladium strontium titanate |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Catalysis |
