期刊
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
卷 221, 期 9-10, 页码 1209-1220出版社
WALTER DE GRUYTER GMBH
DOI: 10.1524/zpch.2007.221.9-10.1209
关键词
density functional theory; oxygen reduction reaction; structure sensitivity; nanoparticles; size effect
A simple, first principles-based model of the oxygen reduction reaction (ORR) is used to determine ORR kinetics on the (I 11), (100), and (211) facets of eleven transition metals (Au, Ag, Pt, Pd, It, Cu, Rh, Ni, Ru, Co, Fe). For most metals, the unreconstructed (100) facets are found to have an activity comparable to, or slightly higher than, the (I 11) facets. In contrast, (211) steps are found to be significantly less active than the terraces, with the exception of the most noble metals. These results are combined with simple models of the geometries of catalytic nanoparticles to estimate the average ORR activity of Pt and An nanoparticles of various sizes. On Pt, a modest decrease in the activity with decreasing particle size is predicted, while for Au, the opposite trend is found.
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