Conditions for stable operation of solid oxide electrolysis cells: oxygen electrode effects

Park, Beom-Kyeong; Zhang, Qian; Voorhees, Peter W.; Barnett, Scott A.

doi:10.1039/c9ee01664c

Conditions for stable operation of solid oxide electrolysis cells: oxygen electrode effects

Journal Article · Fri Jul 26 00:00:00 EDT 2019 · Energy & Environmental Science

DOI:https://doi.org/10.1039/c9ee01664c· OSTI ID:2229646

^[1]; Zhang, Qian ^[2]; Voorhees, Peter W. ^[2]; ^[2]

Northwestern University, Evanston, IL (United States); Northwestern University
Northwestern University, Evanston, IL (United States)

Solid oxide electrolysis cells (SOECs) convert renewable electricity to fuels with efficiency substantially higher than other electrolysis technologies. However, questions remain regarding degradation mechanisms that limit SOEC long-term stability. One of the key degradation mechanisms is oxygen electrode delamination; although prior studies have improved the understanding of this mechanism, it is still difficult to predict how degradation depends on SOEC materials and operating conditions, i.e., temperature, voltage, and current density. Here we present a study aimed at developing a quantitative understanding of oxygen electrode delamination. Experimentally, a life test study of symmetric and full cells with yttria-stabilized zirconia (YSZ) electrolytes and Gd-doped ceria (GDC) barrier layers was done with three different perovskite oxygen electrode materials. Fracture was observed at the perovskite–GDC interface above a critical current density and below a critical operating temperature. A theory is presented that combines a calculation of the effective oxygen pressure across the electrolyte with an estimation of the pressure required for fracture. Fracture is correctly predicted for a critical oxygen partial pressure of ~7200 atm and an associated electrode overpotential of ~0.2 V, occurring at the electrode/GDC interface because of the relatively low perovskite fracture toughness. As a result, damage at the GDC/YSZ interface was also observed in some cases and explained by a peak in the oxygen pressure at this interface.

View Accepted Manuscript (DOE)

Research Organization:: Northwestern University, Evanston, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO)

Grant/Contract Number:: EE0008079

OSTI ID:: 2229646

Alternate ID(s):: OSTI ID: 1804016
OSTI ID: 1546809

Journal Information:: Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 10 Vol. 12; ISSN 1754-5692

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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