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Tuning electrochemical and transport processes to achieve extreme performance and efficiency in solid oxide cells

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/d0ta04555a· OSTI ID:2229674

Solid oxide cells (SOCs) have important applications as fuel cells and electrolyzers. The application for storage of renewable electricity is also becoming increasingly relevant; however, it is difficult to meet stringent area-specific resistance (ASR) and long-term stability targets needed to achieve required efficiency and cost. Here we show a new SOC that utilizes a very thin Gd-doped ceria (GDC)/yttria-stabilized zirconia (YSZ) bi-layer electrolyte, Ni–YSZ cell support with enhanced porosity, and electrode surface modification using PrOx and GDC nanocatalysts to achieve unprecedented low ASR values < 0.1 Ω cm2, fuel cell power density ~3 W cm–2, and electrolysis current density ~4 A cm–2 at 800 °C. Besides this exceptionally high performance, fuel cell and electrolysis life tests suggest very promising stability in fuel cell and steam electrolysis modes. Furthermore, electrochemical impedance spectroscopy analysis done using a novel impedance subtraction method shows how rate-limiting electrode processes are impacted by the new SOC materials and design.

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); Office of Naval Research (ONR); National Science Foundation (NSF)
Grant/Contract Number:
EE0008079
OSTI ID:
2229674
Alternate ID(s):
OSTI ID: 1804024
OSTI ID: 1631887
Journal Information:
Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 23 Vol. 8; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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