Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 111, Issue 45, Pages 17052-17060Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp075108g
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In this work, the relationship between electronic structure and adsorption energies of oxygen reduction reaction (ORR) intermediates (O, OH, OOH, O-2, and H2O) is investigated for modified Pt surfaces. Model surfaces were constructed to examine lattice strain and electronic ligand effects. Compressive strain, which broadens the metal d band, was found to destabilize adsorption of all of the intermediates. Whereas binding energy shifts due to strain correlate well for all of the intermediates examined, shifts in 0 adsorption energy resulting from ligand contributions were found not to correlate with the other intermediates. Additionally, the adsorption energy of oxygenate intermediates was found not to depend solely on the d-band center of the surface. Although the d-band center is important, adsorption is also dependent on the electron density near the Fermi level.
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