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Highly Durable, Surface Modified SOFCs Running on Hydrocarbon Fuels at 600 °C

Journal Article · · Journal of the Electrochemical Society (Online)
 [1];  [2];  [2];  [2];  [2]
  1. Univ. of Maryland, College Park, MD (United States); OSTI
  2. Univ. of Maryland, College Park, MD (United States)
+ Show Author Affiliations
Fuel flexibility is a unique feature of solid oxide fuel cells (SOFCs), the instability of Ni-based cermet anodes in hydrocarbon fuels impede the advancement of low-temperature solid oxide fuel cells (LT-SOFCs). Here we demonstrate highly stable LT-SOFCs prepared by catalytically modifying the surface of a conductive ceramic oxide, SrFe0.2Co0.4Mo0.4O3 (SFCM), using Ni-GDC nanoparticles (<100 nm). The nano-sized Ni-GDC electrocatalysts, resulting from careful optimization of Ni-to-GDC ratio, and subsequent low-temperature calcination process, enhance the fuel oxidation kinetics and stability of SFCM anode significantly. An optimized Ni-to-GDC ratio of 1:10 on SFCM-supported SOFC delivered peak power density of 0.75, 0.65 and 0.36 W cm-2 at 650 °C, 600 °C and 550 °C, respectively, in humidified H2 and 0.62, 0.39 and 0.22 W cm-2 at 650 °C, 600 °C and 550 °C, respectively, in CH4/H2 gas mixtures, nearly 4× higher than GDC as electrocatalyst. Notably, for the same Ni-to-GDC ratio, a stable cell voltage of 0.82 V is maintained over 200 h of operations (under current) at 600 °C in CH4/H2 gas mixtures.
Research Organization:
Redox Power Systems, College Park, MD (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0000494; FE0027897
OSTI ID:
1799007
Journal Information:
Journal of the Electrochemical Society (Online), Journal Name: Journal of the Electrochemical Society (Online) Journal Issue: 10 Vol. 167; ISSN 1945-7111
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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