Carbon and Redox Tolerant Infiltrated Oxide Fuel-Electrodes for Solid Oxide Cells

Theis Løye Skafte, Bhaskar Reddy Sudireddy, P. Blennow, Christopher R. Graves

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Abstract

To solve issues of coking and redox instability related to the presence of nickel in typical fuel electrodes in solid oxide cells,Gd-doped CeO2 (CGO) electrodes were studied using symmetriccells. These electrodes showed high electro-catalytic activity, butlow electronic conductivity. When infiltrated with Sr0.99Fe0.75Mo0.25O3-δ (SFM), the electronic conductivity wasenhanced. However, polarization resistance of the cells increased,suggesting that the infiltrated material is less electro-catalyticallyactive and was partly blocking the CGO surface reaction sites. Theactivity could be regained by infiltrating nano-sized CGO orNiCGO on top of SFM, while still sustaining the high electronicconductivity. Ohmic resistance of the electrodes was thuspractically eliminated and performance comparable to, or betterthan, state-of-the-art fuel electrodes was achieved. The Nicontaining cells were damaged by carbon deposition in a CO/CO2-atmosphere, while none of the non-nickel cells catalyzed carbon.Stability towards redox cycles was also proven.
Original languageEnglish
JournalE C S Transactions
Volume72
Issue number7
Pages (from-to)201-214
Number of pages14
ISSN1938-5862
DOIs
Publication statusPublished - 2016
EventThe 229th ECS Meeting - San Diego, CA, United States
Duration: 29 May 20162 Jun 2016
Conference number: 229
http://www.electrochem.org/229

Conference

ConferenceThe 229th ECS Meeting
Number229
Country/TerritoryUnited States
CitySan Diego, CA
Period29/05/201602/06/2016
Internet address

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