Formation of three-dimensional bicontinuous structures via molten salt dealloying studied in real-time by in situ synchrotron X-ray nano-tomography

Xiaoyang Liu, Arthur Ronne (), Lin-Chieh Yu, Yang Liu, Mingyuan Ge, Cheng-Hung Lin, Bobby Layne, Phillip Halstenberg, Dmitry S. Maltsev, Alexander S. Ivanov, Stephen Antonelli, Sheng Dai, Wah-Keat Lee, Shannon M. Mahurin, Anatoly I. Frenkel, James F. Wishart, Xianghui Xiao and Yu-chen Karen Chen-Wiegart ()
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Xiaoyang Liu: Stony Brook University
Arthur Ronne: Stony Brook University
Lin-Chieh Yu: Stony Brook University
Yang Liu: Stony Brook University
Mingyuan Ge: Brookhaven National Laboratory
Cheng-Hung Lin: Stony Brook University
Bobby Layne: Brookhaven National Laboratory
Phillip Halstenberg: University of Tennessee
Dmitry S. Maltsev: University of Tennessee
Alexander S. Ivanov: Oak Ridge National Laboratory
Stephen Antonelli: Brookhaven National Laboratory
Sheng Dai: University of Tennessee
Wah-Keat Lee: Brookhaven National Laboratory
Shannon M. Mahurin: Oak Ridge National Laboratory
Anatoly I. Frenkel: Stony Brook University
James F. Wishart: Brookhaven National Laboratory
Xianghui Xiao: Brookhaven National Laboratory
Yu-chen Karen Chen-Wiegart: Stony Brook University

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract Three-dimensional bicontinuous porous materials formed by dealloying contribute significantly to various applications including catalysis, sensor development and energy storage. This work studies a method of molten salt dealloying via real-time in situ synchrotron three-dimensional X-ray nano-tomography. Quantification of morphological parameters determined that long-range diffusion is the rate-determining step for the dealloying process. The subsequent coarsening rate was primarily surface diffusion controlled, with Rayleigh instability leading to ligament pinch-off and creating isolated bubbles in ligaments, while bulk diffusion leads to a slight densification. Chemical environments characterized by X-ray absorption near edge structure spectroscopic imaging show that molten salt dealloying prevents surface oxidation of the metal. In this work, gaining a fundamental mechanistic understanding of the molten salt dealloying process in forming porous structures provides a nontoxic, tunable dealloying technique and has important implications for molten salt corrosion processes, which is one of the major challenges in molten salt reactors and concentrated solar power plants.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23598-8

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DOI: 10.1038/s41467-021-23598-8

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