Adsorption of water on O(2x2)/Ru(0001): thermal stability and inhibition of dissociation by H2O-O bonding

Journal Article · Fri Aug 01 00:00:00 EDT 2008 · Journal of Physical Chemistry

OSTI ID:946148

Mugarza, Aitor; Shimizu, Tomoko; Cabrera-Sanfelix, Pepa; Sanchez-Portal, Daniel; Arnau, Andres; Salmeron, Miquel

The effect of preadsorbed oxygen on the subsequent adsorption and reactions of water on Ru(0001) has been studied using low temperature scanning tunneling microscopy and DFT calculations. Experiments were carried out for O coverages close to 0.25 ML. It was found that no dissociation of water takes place up to the desorption temperature of {approx}180-230 K. DFT calculations show that intact water on O(2x2)/Ru(0001) is {approx} 0.49 eV more stable than the dissociation products, H and OH, at their preferred fcc and top adsorption sites.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Materials Sciences Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 946148
• Report Number(s): LBNL-1387E; JPCHAX; TRN: US200903%%256
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

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ADSORPTION
BONDING
DESORPTION
DISSOCIATION
OXYGEN
SCANNING TUNNELING MICROSCOPY
STABILITY
WATER