Abstract
Titanates capable of exsolving B-site metals have shown great potential as fuel electrode in solid oxide cells (SOCs). The well-anchored nano-particles are found to exhibit superior electrocatalytic activity and resistance towards carbon deposition. Here, in order to investigate the intrinsic properties of exsolved particles under redox conditions, we selected La0.43Ca0.37Ni0.06Ti0.94O3-δ (LCNT), La0.43Ca0.37Ni0.03Fe0.03Ti0.94O3-δ (LCNFT), and La0.8Ce0.1Ni0.4Ti0.6O3 (LCeNT) as model electrode materials to exsolve Ni, Ni-Fe alloy, and Ni-CeO2, respectively. The influence of co-doping, doping level, and A-site deficiency on the exsolution process and the behavior of the exsolved particles upon oxidation were studied and characterized. The results suggest that all three materials exsolved nano-particles after reduction with different size and population, yet they tend to follow a similar trend upon oxidation.
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