Direct in-situ imaging of electrochemical corrosion of Pd-Pt core-shell electrocatalysts

Fenglei Shi, Peter Tieu, Hao Hu, Jiaheng Peng, Wencong Zhang, Fan Li, Peng Tao, Chengyi Song, Wen Shang, Tao Deng, Wenpei Gao (), Xiaoqing Pan () and Jianbo Wu ()
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Fenglei Shi: Shanghai Jiao Tong University
Peter Tieu: University of California, Irvine
Hao Hu: Shanghai Jiao Tong University
Jiaheng Peng: Shanghai Jiao Tong University
Wencong Zhang: Shanghai Jiao Tong University
Fan Li: Shanghai Jiao Tong University
Peng Tao: Shanghai Jiao Tong University
Chengyi Song: Shanghai Jiao Tong University
Wen Shang: Shanghai Jiao Tong University
Tao Deng: Shanghai Jiao Tong University
Wenpei Gao: Shanghai Jiao Tong University
Xiaoqing Pan: University of California, Irvine
Jianbo Wu: Shanghai Jiao Tong University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-49434-3

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