期刊
NATURE CATALYSIS
卷 2, 期 1, 页码 78-85出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41929-018-0190-6
关键词
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资金
- Office of Basic Energy Sciences of the US Department of Energy through the Chemical Sciences, Geosciences, and Biosciences Division [DE-AC02-05CH11231]
- US National Science Foundation [DMR-1809700]
- Jeffress Trust Awards Program in Interdisciplinary Research from Thomas F. and Kate Miller Jeffress Memorial Trust
- US Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
Bimetallic and multi-component catalysts typically exhibit composition-dependent activity and selectivity, and when optimized often outperform single-component catalysts. Here we used ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) and in situ and ex situ transmission electron microscopy (TEM) to elucidate the origin of composition dependence observed in the catalytic activities of monodisperse CoPd bimetallic nanocatalysts for CO oxidation. We found that the catalysis process induced a reconstruction of the catalysts, leaving CoOx on the nanoparticle surface. The synergy between Pd and CoOx coexisting on the surface promotes the catalytic activity of the bimetallic catalysts. This synergistic effect can be optimized by tuning the Co/Pd ratios in the nanoparticle synthesis, and it reaches a maximum at compositions near Co0.24Pd0.76, which achieves complete CO conversion at the lowest temperature. Our combined AP-XPS and TEM studies provide direct observation of the surface evolution of the bimetallic nanoparticles under catalytic conditions and show how this evolution correlates with catalytic properties.
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