Three-dimensional strain dynamics govern the hysteresis in heterogeneous catalysis
| Autor: | Ross Harder, Aline Ribeiro Passos, Amélie Rochet, Florian Meneau, Luiza M. Manente, Wonsuk Cha, Ana F. Suzana |
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| Přispěvatelé: | Brazilian Center for Research in Energy and Materials (CNPEM), Universidade Estadual Paulista (Unesp), Argonne National Laboratory |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Science General Physics and Astronomy Nanoparticle 02 engineering and technology 010402 general chemistry Heterogeneous catalysis 01 natural sciences Article General Biochemistry Genetics and Molecular Biology Catalysis Nanomaterials lcsh:Science Multidisciplinary Structural properties Elastic energy General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Hysteresis Nanocrystal Chemical physics Nanoparticles Particle lcsh:Q 0210 nano-technology |
| Zdroj: | Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020) Nature Communications Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 2041-1723 |
| Popis: | Understanding catalysts strain dynamic behaviours is crucial for the development of cost-effective, efficient, stable and long-lasting catalysts. Here, we reveal in situ three-dimensional strain evolution of single gold nanocrystals during a catalytic CO oxidation reaction under operando conditions with coherent X-ray diffractive imaging. We report direct observation of anisotropic strain dynamics at the nanoscale, where identically crystallographically-oriented facets are qualitatively differently affected by strain leading to preferential active sites formation. Interestingly, the single nanoparticle elastic energy landscape, which we map with attojoule precision, depends on heating versus cooling cycles. The hysteresis observed at the single particle level is following the normal/inverse hysteresis loops of the catalytic performances. This approach opens a powerful avenue for studying, at the single particle level, catalytic nanomaterials and deactivation processes under operando conditions that will enable profound insights into nanoscale catalytic mechanisms. Direct visualisation of site-specific strain variations of catalysts is needed to better understand catalytic properties. Here, the authors determine with attojoule precision that the well-known catalytic hysteresis phenomenon occurs at single particle level and involves three-dimensional strain field. |
| Databáze: | OpenAIRE |
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