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

Liu, Xiaoyang; Ronne, Arthur; Yu, Lin-Chieh; Liu, Yang; Ge, Mingyuan; Lin, Cheng-Hung; Layne, Bobby; Halstenberg, Phillip; Maltsev, Dmitry S.; Ivanov, Alexander S.; Antonelli, Stephen; Dai, Sheng; Lee, Wah-Keat; Mahurin, Shannon M.; Frenkel, Anatoly I.; Wishart, James F.; Xiao, Xianghui; Chen-Wiegart, Yu-chen Karen

doi:10.1038/s41467-021-23598-8

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

Journal Article · 08 June 2021 · Nature Communications

DOI: https://doi.org/10.1038/s41467-021-23598-8 · OSTI ID:1787400

; Ronne, Arthur; Yu, Lin-Chieh; Liu, Yang; Ge, Mingyuan; Lin, Cheng-Hung; Layne, Bobby;

;

; Antonelli, Stephen;

; Lee, Wah-Keat; Mahurin, Shannon M.;

;

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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0012704

OSTI ID:: 1787400

Report Number(s):: BNL-221827-2021-JAAM; 3441; PII: 23598

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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