Abstract

FZJ-2026-05646

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Doped Sr2FeMo0.65M0.35O6-δ (M = Ni, Co, Cu, Mn and Ti) asfuel electrode materials for high-temperature CO2electrolysis

Thankappakurup, S.FZJ*RWTH* ; Wolf, S. ; Vibhu, V. (Corresponding author)FZJ* ; Eichel, R.-A.FZJ*RWTH*

2026

Abstract: The state-of-the-art cermet-based Ni-YSZ fuel electrode used in solid oxide electrolysis cells(SOECs) often suffers from Ni migration and agglomeration under high-temperatureoperating conditions, resulting in significant electrode degradation.To address this issue, Sr2Fe2-xMoxO6-δ (SFM) based MIEC materials were considered asalternative fuel electrodes. Their good electronic and ionic conductivity, as well as excellentcatalytic activity, originate mainly from the mixed-valence states of Fe2+/Fe3+ and Mo5+/Mo6+in reducing atmospheres. The selected SFM material was further substituted on the B-sitewith transition metals, leading to Sr2FeMo0.65M0.35O6-δ (M = Ni, Co, Cu, Ti, and Mn). Thesematerials were synthesized via a solid-state method, and their structural stability wasexplored under different atmospheres using XRD. For further material characterization, thetechniques TGA, dilatometry, XPS, SEM-EDS, and four-probe conductivity measurementswere employed. Finally, electrolyte-supported single cells were prepared, denoted as“doped SFM//GDC//YSZ//GDC//LSCF” and their performance was investigated under CO2electrolysis conditions with an 80% CO2 + 20% CO fuel gas mixture.

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IET-1)

Research Program(s):

1. 1232 - Power-based Fuels and Chemicals (POF4-123) (POF4-123)
2. HITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406) (HITEC-20170406)

Appears in the scientific report 2026

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