Theoretical Analysis of Critical Conditions for Crack Formation and Propagation, and Optimal Operation of SOECs

Wang, Yudong; Virkar, Anil V.; Khonsari, M. M.; Zhou, Xiao-Dong

doi:10.1149/1945-7111/ac5fee

Theoretical Analysis of Critical Conditions for Crack Formation and Propagation, and Optimal Operation of SOECs

Journal Article · Thu Apr 28 00:00:00 EDT 2022 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/ac5fee· OSTI ID:2325467

; Virkar, Anil V.; Khonsari, M. M.;

A theoretical analysis on crack formation and propagation was performed based on the coupling between the electrochemical process, classical elasticity, and fracture mechanics. The chemical potential of oxygen, thus oxygen partial pressure, at the oxygen electrode-electrolyte interface ( $μ_{O_{2}}^{OE∣El}$ ) was investigated as a function of transport properties, electrolyte thickness and operating conditions (e.g., steam concentration, constant current, and constant voltage). Our analysis shows that: a lower ionic area specific resistance (ASR), $r_{i}^{O E},$ and a higher electronic ASR ( $r_{e}^{O E}$ ) of the oxygen electrode/electrolyte interface are in favor of suppressing crack formation. The $μ_{O_{2}}^{O E ∣ E l},$ thus local pO ₂ , are sensitive towards the operating parameters under galvanostatic or potentiostatic electrolysis. Constant current density electrolysis provides better robustness, especially at a high current density with a high steam content. While constant voltage electrolysis leads to greater variations of $μ_{O_{2}}^{O E ∣ E l} .$ Constant current electrolysis, however, is not suitable for an unstable oxygen electrode because $μ_{O_{2}}^{O E ∣ E l}$ can reach a very high value with a gradually increased $r_{i}^{O E} .$ A crack may only occur under certain conditions when $p_{O_{2}}^{T P B} > p_{c r} .$

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Research Organization:: University of Louisiana, Lafayette, LA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0032110

OSTI ID:: 2325467

Alternate ID(s):: OSTI ID: 1856067
OSTI ID: 1980875

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 169; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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