TY - JOUR
T1 - Interfacial Reactivity-Triggered Oscillatory Lattice Strains of Nanoalloys
AU - Wu, Zhi-Peng
AU - Dinh, Dong
AU - Maswadeh, Yazan
AU - Caracciolo, Dominic T.
AU - Zhang, Hui
AU - Li, Tianyi
AU - Vargas, Jorge A.
AU - Madiou, Merry
AU - Chen, Cailing
AU - Kong, Zhijie
AU - Li, Zeqi
AU - Zhang, Huabin
AU - Ruiz Martínez, Javier
AU - Lu, Susan S.
AU - Wang, Lichang
AU - Ren, Yang
AU - Petkov, Valeri
AU - Zhong, Chuan-Jian
PY - 2024/12/25
Y1 - 2024/12/25
N2 - 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. © 2024 American Chemical Society.
AB - 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. © 2024 American Chemical Society.
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U2 - 10.1021/jacs.4c12550
DO - 10.1021/jacs.4c12550
M3 - RGC 21 - Publication in refereed journal
C2 - 39656092
SN - 0002-7863
VL - 146
SP - 35264
EP - 35274
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 51
ER -
