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Structure and Bonding of Water on Pt(111)

We address the adsorption of water on Pt(111) using x-ray absorption, x-ray emission, and x-ray photoelectron spectroscopy along with calculations in the framework of density functional theory. Using the direct relationship between the electronic structure and adsorbate geometry, we show that in the first layer all the molecules bind directly to the surface and to each other through the in in-layer H bonds without dissociation, creating a nearly flat overlayer.
The water molecules are adsorbed through alternating metal-oxygen (M-O) and metal-hydrogen (M-HO) bonds. This gives new insight to a fundamental question in electrochemistry that has been the subject of much controversy for the last two decades. This finding may help to better understand corrosion and the catalytic reactions exploited by hydrogen fuel cells.
Stockholm University |AlbaNova University Center| Fysikum |Updated 14 June 2010 | back to top |