Tracking the nanoparticle exsolution/reoxidation processes of Ni-doped SrTi_0.3Fe_0.7O_3−δ electrodes for intermediate temperature symmetric solid oxide fuel cells

Abstract

The development of redox stable oxide perovskite – based electrodes for cost-effective symmetric solid oxide fuel cells (SOFCs) that can work at intermediate temperatures and compete with state-of-the-art cathodes and...

Atomic layer deposition for surface area determination of solid oxide electrodes

“…16,17 Here we explore sintered STF and STFN fuel electrodes in which Fe or bimetallic Ni–Fe exsolution respectively, has been observed. 6,18 Fig. 5 illustrates the change in the electrode surface morphology before and after exsolution in SEM images for the three compositions: Sr(Ti 0.3 Fe 0.7 )O 3− δ (STF), Sr(Ti 0.3 Fe 0.63 Ni 0.07 )O 3− δ (S 1.00 TFN), and Sr 0.95 (Ti 0.3 Fe 0.63 Ni 0.07 )O 3− δ (S 0.95 TFN).…”

“…16,17 Here we explore sintered STF and STFN fuel electrodes in which Fe or bimetallic Ni-Fe exsolution respectively, has been observed. 6,18 3 Comparison between methodologies of surface area determination, two using the ALD method (one deriving Al 2 O 3 volume by ICP-OES, the other by its mass) and the last using the BET method. Also shown is the signal and error from ICP-OES on samples that were not coated with ALD-Al 2 O 3 .…”

Effect of Sr Incorporation and Ni Exsolution on Coke Resistance of the Ni/Sr–Al2O3 Catalyst for Dry Reforming of Methane

“…The larger CO 2 desorption peak of Ni EXS /Sr−Al at 816 °C might be due to the surface enrichment of Sr during the exsolution process, whereas Ni IMP /Sr−Al did not enrich Sr onto the surface of the catalyst. 56,57 Also, Table S4 shows that Ni EXS / Sr−Al had a higher atomic percentage of surface Sr. A larger amount of surface Sr increased the basicity of the catalytic surface, resulting in the appearance of a substantially larger desorption peak.…”

Reversibility limitations of metal exsolution reactions in niobium and nickel co-doped strontium titanate

“…Of particular interest is that the exsolution process was reported to be reversible 4,[11][12][13][14][15] or partially reversible 16,17 in some cases, which may offer the possibility to reactivate the catalysts in the case of deactivation by coking, sulfur poisoning or coarsening of the nanoparticles by re-dissolution of the metallic phase within the oxide host under oxidizing thermal treatment and repeated exsolution under reducing operation conditions. Reversible metal exsolution reactions would hence promise considerable technological advances, extending the lifetimes of catalysts by regeneration upon redox cycling to prevent a loss in electrochemically active triple phase boundaries.…”