イベント

イベント

第122回先端計測オープンセミナー
Fundamental studies on the influence of defects and coadsorbates on adsorption of H2O and H2 on platinum
Prof. Ludo B.F. Juurlink (Leiden Institute of Chemistry, Leiden University)

2018年4月11日(水)10:00~11:00

会場/Venue:

千現地区 研究本館8階 中セミナー室
Sengen Main Bldg. 8F Middle Seminar Room

講演者/Speaker:

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

表題/Title:

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

講演要旨/Abstract:

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 Hads and Oads 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)
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