Doped Yttrium Chromite-Ceria Composite as a Redox-Stable and Sulfur-Tolerant Anode for Solid Oxide Fuel Cells

Journal Article · Sun Dec 11 04:00:00 EST 2011 · Electrochemistry Communications

DOI:https://doi.org/10.1016/j.elecom.2011.08.025· OSTI ID:1031435

Yoon, Kyung J; Coyle, Christopher A; Marina, Olga A

A Ca- and Co-doped yttrium chromite (YCCC) - samaria-doped ceria (SDC) composite was studied in relation to a potential use as a solid oxide fuel cell (SOFC) anode material. Tests performed using the yttria-stabilized zirconia (YSZ) electrolyte-supported cells revealed that the electrocatalytic activity of the YCCC-SDC anode towards hydrogen oxidation at 800 C was comparable to that of the Ni-YSZ anode. In addition, the YCCC-SDC anode exhibited superior sulfur tolerant characteristics showing less than 10% increase in a polarization resistance, fully reversible, upon exposure to 20 ppm H2S at 800 C. No performance degradation was observed during multiple reduction-oxidation (redox) cycles when the anode was intentionally exposed to the air environment followed by the reduction in hydrogen. The redox tolerance of the YCCC-SDC anode was attributed to the dimensional and chemical stability of the YCCC exhibiting minimal isothermal chemical expansion upon redox cycling.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1031435
• Report Number(s): PNNL-SA-78708; AA2530000
• Journal Information: Electrochemistry Communications, Journal Name: Electrochemistry Communications Journal Issue: 12 Vol. 13; ISSN 1388-2481
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
30 DIRECT ENERGY CONVERSION
AIR
ANODES
CHROMITES
Doped yttrium chromite
HYDROGEN
OXIDATION
Oxidation-reduction cycling
PERFORMANCE
POLARIZATION
SOFC anode
SOLID OXIDE FUEL CELLS
STABILITY
SULFUR
Sulfur tolerance
TOLERANCE
YTTRIUM