Nanoscale kinetics of asymmetrical corrosion in core-shell nanoparticles

Hao Shan, Wenpei Gao, Yalin Xiong, Fenglei Shi, Yucong Yan, Yanling Ma, Wen Shang, Peng Tao, Chengyi Song, Tao Deng, Hui Zhang (), Deren Yang, Xiaoqing Pan () and Jianbo Wu ()
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Hao Shan: School of Materials Science and Engineering, Shanghai Jiao Tong University
Wenpei Gao: University of California, Irvine
Yalin Xiong: School of Materials Science & Engineering, Zhejiang University, Hangzhou
Fenglei Shi: School of Materials Science and Engineering, Shanghai Jiao Tong University
Yucong Yan: School of Materials Science & Engineering, Zhejiang University, Hangzhou
Yanling Ma: School of Materials Science and Engineering, Shanghai Jiao Tong University
Wen Shang: School of Materials Science and Engineering, Shanghai Jiao Tong University
Peng Tao: School of Materials Science and Engineering, Shanghai Jiao Tong University
Chengyi Song: School of Materials Science and Engineering, Shanghai Jiao Tong University
Tao Deng: School of Materials Science and Engineering, Shanghai Jiao Tong University
Hui Zhang: School of Materials Science & Engineering, Zhejiang University, Hangzhou
Deren Yang: School of Materials Science & Engineering, Zhejiang University, Hangzhou
Xiaoqing Pan: University of California, Irvine
Jianbo Wu: School of Materials Science and Engineering, Shanghai Jiao Tong University

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Designing new materials and structure to sustain the corrosion during operation requires better understanding on the corrosion dynamics. Observation on how the corrosion proceeds in atomic scale is thus critical. Here, using a liquid cell, we studied the real-time corrosion process of palladium@platinum (Pd@Pt) core-shell nanocubes via transmission electron microscopy (TEM). The results revealed that multiple etching pathways operatively contribute to the morphology evolution during corrosion, including galvanic etching on non-defected sites with slow kinetics and halogen-induced etching at defected sites at faster rates. Corners are the preferential corrosion sites; both etching pathways are mutually restricted during corrosion. Those insights on the interaction of nanostructures with reactive liquid environments can help better engineer the surface structure to improve the stability of electrocatalysts as well as design a new porous structure that may provide more active sites for catalysis.

Date: 2018
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DOI: 10.1038/s41467-018-03372-z

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