Schröder, Johanna; Pittkowski, Rebecca K.; Du, Jia; Kirkensgaard, Jacob J. K.; Arenz, Matthias (2022). Investigating the Particle Growth in Bimodal Pt/C Catalysts by In-Situ Small-Angle X-ray Scattering: Challenges in the Evaluation of Stress Test Protocol-Dependent Degradation Mechanisms. Journal of the Electrochemical Society, 169(10), p. 104504. IOP Publishing 10.1149/1945-7111/ac99a5
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The influence of different combinations of accelerated stress test (AST) protocols simulating load-cycle and start/stop conditions of a proton exchange membrane fuel cell (PEMFC) vehicle is investigated on a bimodal Pt/C catalyst. The bimodal Pt/C catalyst, prepared by mixing two commercial catalysts, serves as a model system and consists of two distinguishable size populations. The change in mean particle size was investigated by in situ small-angle X-ray scattering (SAXS). The comparison to the reference catalysts, i.e., the two single-size population catalysts, uncovers the presence of electrochemical Ostwald ripening as a degradation mechanism in the bimodal catalyst. Increasing the harshness of the applied AST protocol combinations by faster changing between load-cycle or start/stop conditions, the particle size of the larger population of the bimodal catalyst increases faster than expected. Surprisingly, the change in mean particle size of the smaller size population indicates a smaller increase for harsher AST protocols, which might be explained by a substantial electrochemical Ostwald ripening.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Schröder, Johanna, Du, Jia, Arenz, Matthias |
Subjects: |
500 Science > 570 Life sciences; biology 500 Science > 540 Chemistry 000 Computer science, knowledge & systems |
ISSN: |
1945-7111 |
Publisher: |
IOP Publishing |
Language: |
English |
Submitter: |
Matthias Arenz |
Date Deposited: |
09 Feb 2023 11:51 |
Last Modified: |
12 Feb 2023 02:26 |
Publisher DOI: |
10.1149/1945-7111/ac99a5 |
BORIS DOI: |
10.48350/178568 |
URI: |
https://boris.unibe.ch/id/eprint/178568 |
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