| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
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ACerS Robert B. Sosman Award Symposium: Bridging the Gap between Atomistic and Continuum Approaches to Interface Science
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| Presentation Title |
Tracing Impurities at Surfaces and Interfaces of Renewable Energy Materials |
| Author(s) |
Christina Scheu, Joohyun Lim, Se-Ho Kim, Raquel Aymerich Armengol, Rajib Sahu, Olga Kasian, Leigh T. Stephenson, Baptiste Gault |
| On-Site Speaker (Planned) |
Christina Scheu |
| Abstract Scope |
Nanostructured materials, in particular nanosheets and nanowires, can be applied in renewable energy application such as (photo)electrocatalysis as they possess a large surface to volume ratio. This is beneficial as the number of sites where reactions can take place are increased. Often these materials are synthesized by wet chemical approaches. Besides using high purity reactants, impurities can be incorporated into the nanostructures either by the precursor itself or by subsequent heat treatment in various atmospheres. In our work we combine various scanning transmission electron microscopy methods including electron energy loss spectroscopy with atom probe tomography to determine the location of unintentionally added impurities or dopants, their atomic arrangement and oxidation state with ultimate spatial resolution. In the presentation, several examples will be discussed including the presence of impurities at the surface region of hollow, partially reduced titania nanowires (TiO2) and molybdenum disulfide (MoS2) nanosheets stemming from synthesis process and precursor. |