Comment on "interaction of hydrogen with RuO2(110) surfaces: Activity differences between various oxygen species"

Journal of Physical Chemistry B

Volumn 110, Issue 45, 2006, Pages 22947-

  Crihan, D ^a   Knapp, M ^a   Seitsonen, A P ^b   Over, H ^a  

^a JUSTUS LIEBIG UNIVERSITY   (Germany)

^b UNIVERSITÉ PIERRE ET MARIE CURIE   (France)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 33751230184     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp0621272     Document Type: Note

References (10)

1. Knapp, M.; Crihan, D.; Seitsonen, A. P.; Over, H. J. Am. Chem. Soc. 2005, 127, 3236.
2. Jacobi, K.; Wang, Y.; Ertl, G. J. Phys. Chem. B 2006, 110, 6115.
3. The concept of hydrogen transfer is unfortunately not discussed at all in ref 2.
4. At no place in ref 1 did "we proposed that at 300 K hydrogen adsorbs directly on the O-bridge atoms rather than via activation at Ru-cus atoms" (ref 2). What we did propose is that hydrogen forms bridging hydroxyl groups even if the Ru-cus atoms are blocked.
5. 2(110)
6. 2(110).
7. 2-(110), comparing their experiments at 90 K with ours in ref 1 at room temperature. Note that hydrogen adsorption may be activated and therefore temperature dependent.
8. This STM image is part of a forthcoming paper by M. Knapp et al. It was taken at the TU in Vienna in P. Varga and M. Schmid's group.
9. We emphasize that we discuss here a situation where Ru-cus atoms are capped by O-cus atoms; therefore, Ru-cus is not available for the hydrogen adsorption. If, however, part of the Ru-cus atoms are free, then both adsorption via the undercoordinated O atoms and via the Ru-cus atoms are possible.
10. 2(110) surface, hydrogen (sitting molecularly on the Ru-cus atoms) will "preferentially react with O-cus instead of with O-bridge species". Since there is an efficient hydrogen transfer reaction between the O-bridge and the O-cus species (see ref 1), such a conclusion cannot be drawn from the HREELS data in ref 2, that only monitor the final state.