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- Title
Direct in-situ imaging of electrochemical corrosion of Pd-Pt core-shell electrocatalysts.
- Authors
Shi, Fenglei; Tieu, Peter; Hu, Hao; Peng, Jiaheng; Zhang, Wencong; Li, Fan; Tao, Peng; Song, Chengyi; Shang, Wen; Deng, Tao; Gao, Wenpei; Pan, Xiaoqing; Wu, Jianbo
- Abstract
Corrosion of electrocatalysts during electrochemical operations, such as low potential - high potential cyclic swapping, can cause significant performance degradation. However, the electrochemical corrosion dynamics, including structural changes, especially site and composition specific ones, and their correlation with electrochemical processes are hidden due to the insufficient spatial-temporal resolution characterization methods. Using electrochemical liquid cell transmission electron microscopy, we visualize the electrochemical corrosion of Pd@Pt core-shell octahedral nanoparticles towards a Pt nanoframe. The potential-dependent surface reconstruction during multiple continuous in-situ cyclic voltammetry with clear redox peaks is captured, revealing an etching and deposition process of Pd that results in internal Pd atoms being relocated to external surface, followed by subsequent preferential corrosion of Pt (111) terraces rather than the edges or corners, simultaneously capturing the structure evolution also allows to attribute the site-specific Pt and Pd atomic dynamics to individual oxidation and reduction events. This work provides profound insights into the surface reconstruction of nanoparticles during complex electrochemical processes. Understanding electrochemical corrosion mechanism is essential for developing the fundaments of electrochemistry in catalysis. Here, the authors study the electrochemical corrosion of Pd-Pt core-shell catalysts by connecting structure evolution with the in-situ electrochemical cyclic voltammetry.
- Subjects
ELECTROLYTIC corrosion; ELECTRIC batteries; ELECTROCATALYSTS; CATALYST structure; SURFACE reconstruction; TRANSMISSION electron microscopy
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-49434-3