Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.
Career Basics

Site Tools

  • AAAS
  • Subscribe
  • Feedback

Site Search

Search Advanced

Science 14 August 1992:
Vol. 257. no. 5072, pp. 897 - 903
DOI: 10.1126/science.257.5072.897
Prev | Table of Contents | Next

Articles

The Nature of the Metal-Metal Bond in Bimetallic Surfaces

José A. Rodriguez 1 and D. Wayne Goodman 2

1 Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973
2 Chemistry Department, Texas A&M University, College Station, TX 77843

The formation of a surface metal-metal bond can produce large perturbations in the electronic, chemical, and catalytic properties of a metal. Recent studies indicate that charge transfer is an important component in surface metal-metal bonds that involve dissimilar elements. The larger the charge transfer, the stronger the cohesive energy of the bimetallic bond. On a surface, the formation of a heteronuclear metal-metal bond induces a flow of electron density toward the element with the larger fraction of empty states in its valence band. This behavior is completely contrary to that observed in bulk alloys, indicating that the nature of a heteronuclear metal-metal bond depends strongly on the structural geometry of the bimetallic system.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Reaction-Driven Restructuring of Rh-Pd and Pt-Pd Core-Shell Nanoparticles.
F. Tao, M. E. Grass, Y. Zhang, D. R. Butcher, J. R. Renzas, Z. Liu, J. Y. Chung, B. S. Mun, M. Salmeron, and G. A. Somorjai (2008)
Science 322, 932-934
   Abstract »    Full Text »    PDF »
Stabilization of Platinum Oxygen-Reduction Electrocatalysts Using Gold Clusters.
J. Zhang, K. Sasaki, E. Sutter, and R. R. Adzic (2007)
Science 315, 220-222
   Abstract »    Full Text »    PDF »
The Promotional Effect of Gold in Catalysis by Palladium-Gold.
M. Chen, D. Kumar, C.-W. Yi, and D. W. Goodman (2005)
Science 310, 291-293
   Abstract »    Full Text »    PDF »


ADVERTISEMENT
Click Me!

ADVERTISEMENT
Click Me!

To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)