| 학회 | 한국재료학회 |
| 학술대회 | 2014년 가을 (11/27 ~ 11/28, 대전컨벤션센터) |
| 권호 | 20권 2호 |
| 발표분야 | B. 나노 재료(Nanomaterials) |
| 제목 | Interface Controlled Growth of Ceria Nanoarrays on Anatase-TiO2 powder: Theoretical Insights |
| 초록 | Interfaces of oxides and metal nanoparticles have shown extensive potentials for accelerating various catalytic processes, via direct participation[1-3] or the strong metal-support interaction.[4] However, a rational control of the interfaces between comprising elements of nanocatalysts has been a long standing goal, in particular for practical powder level catalysts. Here, we report by combined density functional theory (DFT) and transmission electron microscopy (TEM) studies of interface controlled growth of the ceria nanoarrays on Anatase (A)-titania powders as a showcase. The delicate balance in the CeO2-CeO2 interaction energy, surface energy of CeO2 facets, and the TiO2-CeO2 interface formation energy was controlling the epitaxial growth of 3D nanoaprticles. We found that the Pt atoms were preferentially nucleated at the TiO2-CeO2 interface allowing them to potentially participate in the catalysis at the Pt-CeO2-TiO2 multi-phase interface. Our results pave the way towards the rational design of practically relevant nanomaterials with enhanced stability and functionality. 1. Cargnello, M.; Doan-Nguyen, V. V. T.; Gordon, T. R.; Diaz, R. E.; Stach, E. A.; Gorte, R. J.; Fornasiero, P.; Murray, C. B., Control of Metal Nanocrystal Size Reveals Metal-Support Interface Role for Ceria Catalysts. Science 2013, 341 (6147), 771-773 2. Green, I. X.; Tang, W.; Neurock, M.; Yates, J. T., Spectroscopic Observation of Dual Catalytic Sites During Oxidation of CO on a Au/TiO2 Catalyst. Science 2011, 333 (6043), 736-739 3. Rodriguez, J. A.; Ma, S.; Liu, P.; Hrbek, J.; Evans, J.; Pérez, M., Water-gas shift Reaction on inverse CeOx/Au(111) and TiOx/Au(111) catalysts: Active role of oxide nanoparticles. Science 2007, 318, 1757-1760 4. Campbell, C. T., Catalyst-support interactions: Electronic perturbations. Nat. Chem. 2012, 4 (8), 597-598 Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. |
| 저자 | 김현유1, Ping Liu2, Mark S. Hybertsen3 |
| 소속 | 1충남대, 2Center for Functional Nanomaterials, 3Brookhaven National Laboratory |
| 키워드 | ceria; titania; interface; heterogeneous catalysis; density functional theory |
