التفاصيل البيبلوغرافية
| العنوان: |
Nanoscopic Surface Decomposition of Pr 0.5 Ba 0.5 CoO 3−δ Perovskites Turns Performance Descriptors Ambiguous |
| المؤلفون: |
David N. Mueller (4449694), Margret Giesen (10660692), Tomáš Duchoň (1443958), Stefan Cramm (10660695), Felix Gunkel (3838051), Matteo Jugovac (4822428), Giovanni Zamborlini (1535272), Vitaliy Feyer (1805521), Claus M. Schneider (4228339) |
| سنة النشر: |
2021 |
| المجموعة: |
Smithsonian Institution: Digital Repository |
| مصطلحات موضوعية: |
Biophysics, Biochemistry, Medicine, Evolutionary Biology, Infectious Diseases, Virology, Environmental Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, Pr, oxidizing environments, oxygen evolution reaction, 0.5, surface, X-ray absorption spectroscopy, Nanoscopic Surface Decomposition, Ba, Performance Descriptors Ambiguous, sub-micrometer length scales, chemical evolutions, results showcase, length scales, electrochemical cells, processing conditions, descriptor, CoO |
| الوصف: |
The surface electronic structure of a material is frequently used to identify simple descriptors for its catalytic efficacy and other properties. To harness the predictive ability of such descriptors, structural and chemical evolutions of the material when exposed to operating conditions, such as oxidizing environments and high temperatures, need to be considered. These evolutions occur at length scales not easily observable, leading to averaging over short-range variations and thus misinterpretation of the property in question. Here, we investigate perovskite Pr 0.5 Ba 0.5 CoO 3−δ as a prototypical mixed ionic–electronic conductor that exhibits promising catalytic properties toward the oxygen evolution reaction in electrochemical cells, which have been characterized by such descriptors. We employ spatially resolved X-ray absorption spectroscopy and find a Cahn–Hilliard-type decomposition process at sub-micrometer length scales after mere hours at operating or processing conditions. The observation is in contrast to the thermodynamic stability of the Pr 0.5 Ba 0.5 CoO 3−δ bulk, suggesting the decomposition to be confined to the surface. Our results showcase a considerable lateral inhomogeneity of the surface electronic structure, emphasizing that descriptors derived through spatially averaging techniques have to be heavily scrutinized. |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
unknown |
| Relation: |
https://figshare.com/articles/journal_contribution/Nanoscopic_Surface_Decomposition_of_Pr_sub_0_5_sub_Ba_sub_0_5_sub_CoO_sub_3_sub_Perovskites_Turns_Performance_Descriptors_Ambiguous/14439402 |
| DOI: |
10.1021/acs.jpcc.1c00976.s001 |
| الاتاحة: |
https://doi.org/10.1021/acs.jpcc.1c00976.s001 |
| Rights: |
CC BY-NC 4.0 |
| رقم الانضمام: |
edsbas.106118E9 |
| قاعدة البيانات: |
BASE |