Optimal operation of solid-oxide electrolysis cells considering long-term chemical degradation

Giridhar, Nishant V.; Allan, Douglas A.; Li, Mingrui; Zitney, Stephen E.; Biegler, Lorenz T.; Bhattacharyya, Debangsu

doi:10.1016/j.enconman.2024.118950

Optimal operation of solid-oxide electrolysis cells considering long-term chemical degradation

Journal Article · Tue Aug 27 00:00:00 EDT 2024 · Energy Conversion and Management

DOI:https://doi.org/10.1016/j.enconman.2024.118950· OSTI ID:2447439

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West Virginia Univ., Morgantown, WV (United States)
National Energy Technology Laboratory (NETL), Morgantown, WV (United States); NETL Support Contractor, Pittsburgh, PA (United States)
Carnegie Mellon Univ., Pittsburgh, PA (United States)
National Energy Technology Laboratory (NETL), Morgantown, WV (United States)

Optimizing the performance of solid oxide electrolysis cells (SOECs) for long-term hydrogen (H₂) production at high temperatures is crucial, as prolonged operation leads to efficiency losses and shorter cell lifespans due to chemical degradation. Here, in this work, we adopt a quasi-steady state approach for dynamic optimization over extended operational periods to address the disparity in timescales between cell operation and degradation. Integrating a 2-D non-isothermal SOEC model with balance-of-plant (BOP) equipment, we explore three optimization objectives: minimizing terminal degradation, maximizing integral efficiency, and minimizing the levelized cost of H₂ (LCOH). Our dynamic optimization algorithm reduces LCOH by 9.5% and 16% compared to strategies focusing solely on terminal degradation and integral efficiency, respectively. For electricity prices of 0.03 $$\$$$$/mWh and 0.3 $$\$$$$ mWh optimal replacement schedules range from 5 to 2 years, depending on the operational mode. Furthermore, a flexible operational mode yields additional improvements in LCOH over traditional galvanostatic and potentiostatic modes.

View Accepted Manuscript (DOE)

Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy and Carbon Management (FECM)

OSTI ID:: 2447439

Alternate ID(s):: OSTI ID: 2438093

Journal Information:: Energy Conversion and Management, Journal Name: Energy Conversion and Management Vol. 319; ISSN 0196-8904

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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