Assessment of Protective Coatings for Metal-Supported Solid Oxide Electrolysis Cells
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- University of Connecticut, Storrs, CT (United States)
Green hydrogen is essential to achieving carbon neutrality, and solid oxide electrolysis cells can produce hydrogen using renewable power and waste heat. Insufficient long-term durability of solid oxide electrolysis cells has impeded their commercialization. Here, coatings in the porous stainless steel support of metal-supported solid oxide electrolysis cells (MS-SOECs) are used to dramatically improve their performance and durability. The long-term degradation rate of uncoated MS-SOECs is highly dependent on the current density, with the fastest degradation occurring at the highest current density tested, 0.5 A cm-2. At this current density, coatings are quite effective. Three protective coatings, Co3O4 deposited by atomic layer deposition (ALD), Co3O4 deposited by electroplating deposition (ED), and CuMn1.8O4 (CMO) deposited by electrophoretic deposition (EPD), are explored to enhance the performance of MS-SOECs with La0.6Sr0.4Co0.2Fe0.8O3-Sm0.2Ce0.8O3 (LSCF-SDC) as the oxygen catalyst and SDC-Ni as the fuel catalyst. The initial average current density at 1.4 V is increased with coatings. It is 0.83 mA cm-2 for the ALD cells, 1.05 mA cm-2 for the ED cells, and 1.13 mA cm-2 for the EPD cells, compared to 0.65 mA cm-2 for the bare cells at 700 °C with 50% H2-50% H2O. The degradation rate over 1000 h of continuous operation is reduced from 36% to 26%, 27%, and 19% kh-1 with the three coatings, respectively. Furthermore, these improvements are ascribed to reduced Cr poisoning on the oxygen catalyst, which is one of the primary degradation modes for this type of MS-SOEC.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1999221
- Journal Information:
- ACS Applied Energy Materials, Vol. 5, Issue 8; ISSN 2574-0962
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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