The 122nd AMCP Open Seminar

Wed., April 11, 2018, 10:00-11:00

National Institute for Materials Science (NIMS)
Sengen Main Bldg. 8F Middle Seminar Room  → access

Pre-registration is not required.
For inquiries, please contact the Administrative Office.
This lecture is open to the public. Your participation is strongly encouraged.

Prof. Ludo B.F. Juurlink (Leiden Institute of Chemistry , Leiden University)

Fundamental studies on the influence of defects and coadsorbates on adsorption of H₂O and H₂ on platinum

Defects have been known to alter the chemical reactivity of surfaces [1, 2]. While theoretical studies predict trends [3], systematic experimental studies for nanostructured surfaces are sparse.

To start, I review our results on the influence of surface structure on the adsorption of H₂O on platinum obtained using a series of Pt single crystals. I discuss how the two most common step types influence the adsorption of water and address how H_ads and O_ads alter the interaction.

Subsequently, I discuss how curved single crystal surfaces allow for probing the influence of different types of defects with a continuous variation of defect density. We use STM and LEED, AES, TPD, RAIRS, and SMB techniques to study them with varying degrees of spatial resolution[4]. I show how it allows us to unravel fundamental problems in catalysis using H₂ dissociation on platinum [5-6] as an example.

References
[1] S.L. Rernasek, W.J. Siekhaus and G.A. Somorjai, Phys.Rev.Lett. 30, 1202 (1973)
[2] L. Vattuonea, L. Savioa, Ma.Rocca, Surf. Sci. Rep. 63, 101 (2008)
[3] J.K. Norskov et al. J. Catal. 209, 275 (2002)
[4] C. Hahn et al. J. Chem. Phys. 136, 114201 (2012); Mom et al., Surf. Sci. 615, 015 (2013); Janlamool et al., Molecules 19, 10845 (2014); Walsh et al., J. Vac. Sci. Technol A 35, 03E102 (2017)
[5] B. Poelsema, K. Lenz, and G. Comsa, J. Chem. Phys. 134, 074703 (2011); ibid. J. Phys. Condens. Matter 22, 304006 (2010).
[6] A. T. Gee et al., J. Phys. Chem. 112, 7660 (2000); D.A. McCormack et al. J. Chem. Phys. 122, 194708 (2005); I.M.N. Groot et al. J. Phys. Chem. C 117, 9266 (2013)