Journal article

Publication year: 2002

Pages: 137-152

Journal: Surface Science

Volume number: 505

Issue number: 1-3

DOI Link: https://doi.org/10.1016/S0039-6028(02)01147-0

Publisher: Elsevier

Abstract: 

Employing temperature-programmed reaction and desorption, we studied the reduction of RuO2(1 1 0) by CO exposure under various conditions. RuO2(1 1 0) is mildly and heavily reduced by CO exposure when the reaction temperature is below 400 K and above 500 K, respectively. The restoration of the reduced RuO2(1 1 0) surface was investigated by low energy electron diffraction and Auger electron spectroscopy. CO molecules adsorb over the under-coordinated Ru atoms and recombine with the under-coordinated lattice O atoms on the RuO2(1 1 0) surface. The initial conversion probability for this process is as high as 80%. The mildly reduced RuO2(1 1 0) surface is characterized by the removal of bridging O atoms. A mildly reduced surface, where all bridging O atoms are consumed, is inactive in oxidizing CO below 450 K. However, temperature treatment (⩾550 K) or oxygen exposure at room temperature is able to reactivate the mildly reduced surface. Heavy reduction of RuO2(1 1 0) leads to a roughening of the surface, which is partly restored by annealing at 700–800 K. The activation barriers of various reaction pathways, motivated by the present experiments, are determined by state-of-the-art density function theory calculations and compared with experiments.

Harvard Citation style: Wendt, S., Seitsonen, A., Kim, Y., Knapp, M., Idriss, H. and Over, H. (2002) Complex redox chemistry on the RuO2(1 1 0) surface: experiment and theory, Surface Science, 505(1-3), pp. 137-152. https://doi.org/10.1016/S0039-6028(02)01147-0

APA Citation style: Wendt, S., Seitsonen, A., Kim, Y., Knapp, M., Idriss, H., & Over, H. (2002). Complex redox chemistry on the RuO2(1 1 0) surface: experiment and theory. Surface Science. 505(1-3), 137-152. https://doi.org/10.1016/S0039-6028(02)01147-0