English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Interaction of hydrogen with RuO2(110) surfaces: Activity differences between various oxygen species

MPS-Authors
/persons/resource/persons21665

Jacobi,  Karl
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22219

Wang,  Yuemin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21498

Ertl,  Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

Locator
There are no locators available
Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)
There is no public supplementary material available
Citation

Jacobi, K., Wang, Y., & Ertl, G. (2006). Interaction of hydrogen with RuO2(110) surfaces: Activity differences between various oxygen species. Journal of Physical Chemistry B, 110(12), 6115-6122. doi:10.1021/jp056341m.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-04F8-C
Abstract
The interaction of hydrogen with RuO2(110) surfaces was studied by means of thermal desorption and vibration spectroscopies. The stoichiometric surface exposes two types of coordinatively unsaturated atoms: double-bonded O-bridge and five-fold-bonded Ru-cus, while at the O-rich surface the Ru-cus atoms are covered with single-bonded O-cus. On the stoichiometric RuO2(110) surface at 90 K, H-2, either adsorbs molecularly on Ru-cus sites or dissociates and forms with O-bridge an H2O-like surface group. If, in addition, also O-cus is present at the surface, hydrogen interacts exclusively with this species forming H2O-Cus. This demonstrates that hydrogen reacts much more readily with O-cus than with O-bridge as expected from the reduced bond order and smaller binding energy of O-cus. It is furthermore shown that at surface temperatures below 90 K free coordinatively unsaturated Ru-cus sites are needed to activate the incoming H, molecules prior to any reaction with O-cus or O-bridge. Generally, Ru-cus sites play a key role for reactions of a number of molecules at the RuO2(110) surface. These findings are supported by recent DFT-based calculations but are at variance with other reports.