Interfacial Reactivity-Triggered Oscillatory Lattice Strains of Nanoalloys

Zhi Peng Wu, Dong Dinh, Yazan Maswadeh, Dominic T. Caracciolo, Hui Zhang, Tianyi Li, Jorge A. Vargas, Merry Madiou, Cailing Chen, Zhijie Kong, Zeqi Li, Huabin Zhang, Javier Ruiz Martínez, Susan S. Lu, Lichang Wang, Yang Ren, Valeri Petkov*, Chuan Jian Zhong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (SciVal)

Abstract

Understanding the structure evolution of nanoalloys under reaction conditions is vital to the design of active and durable catalysts. Herein, we report an operando measurement of the dynamic lattice strains of dual-noble-metal alloyed with an earth-abundant metal as a model electrocatalyst in a working proton-exchange membrane fuel cell using synchrotron high-energy X-ray diffraction coupled with pair distribution function analysis. The results reveal an interfacial reaction-triggered oscillatory lattice strain in the alloy nanoparticles upon surface dealloying. Analysis of the lattice strains with an apparent oscillatory irregularity in terms of frequency and amplitude using time-frequency domain transformation and theoretical calculation reveals its origin from a metal atom vacancy diffusion pathway to facilitate realloying upon dealloying. This process, coupled with surface metal partial oxidation, constitutes a key factor for the nanoalloy’s durability under the electrocatalytic oxygen reduction reaction condition, which serves as a new guiding principle for engineering durable or self-healable electrocatalysts for sustainable fuel cell energy conversion.

Original languageEnglish (US)
Pages (from-to)35264-35274
Number of pages11
JournalJournal of the American Chemical Society
Volume146
Issue number51
DOIs
StatePublished - Dec 25 2024

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry

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