Issue 15, 2024

Phase stability, redox-behavior and carbon-tolerance of Sr1−x(Ti0.3Fe0.7−yNiy)O3−δ with exsolved nanoparticles

Abstract

Ni-exsolution from perovskites has gained significant attention in the area of electrode materials for fuel and electrolysis cells due to their potential for high catalytic activity, tolerance to degradation, improved redox-cycling stability, and regeneration of the nanoparticles. We investigated the exsolution behavior and phase stability of bulk Sr1−x(Ti0.3Fe0.7−yNiy)O3−δ ceramics at various temperatures and atmospheres. To assess its tolerance to carbon deposition, Sr1−x(Ti0.3Fe0.7−yNiy)O3−δ was compared with commonly used Ni-YSZ materials in the presence of tar-containing biogas. Nanoparticle exsolution was observed in the entire investigated temperature range of 710–900 °C. Above a reduction temperature of 740 °C, Sr1−x(Ti0.3Fe0.7−yNiy)O3−δ partially transforms to a Ruddlesden–Popper phase, while reverting back to the perovskite phase during reoxidation. This phase transition resulted in material expansion and the formation of cracks. Moreover, exposure of reduced Sr1−x(Ti0.3Fe0.7−yNiy)O3−δ to ambient air or H2O led to the formation of secondary phases and fragmentation of sintered pellets. Remarkably, when compared to Ni-YSZ, these materials exhibited no degradation in terms of carbon deposition or Ni dusting after exposure to tar-containing biogas.

Graphical abstract: Phase stability, redox-behavior and carbon-tolerance of Sr1−x(Ti0.3Fe0.7−yNiy)O3−δ with exsolved nanoparticles

Supplementary files

Article information

Article type
Paper
Submitted
25 Sep 2023
Accepted
10 Mar 2024
First published
11 Mar 2024
This article is Open Access
Creative Commons BY license

J. Mater. Chem. A, 2024,12, 9132-9146

Phase stability, redox-behavior and carbon-tolerance of Sr1−x(Ti0.3Fe0.7−yNiy)O3−δ with exsolved nanoparticles

A. Schwiers, D. Röhrer, C. Lenser, B. Steinrücken, D. Sebold, H. Spliethoff, O. Guillon and N. H. Menzler, J. Mater. Chem. A, 2024, 12, 9132 DOI: 10.1039/D3TA05813A

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