Electrochemical characteristics of Sr-deficient SrTi0.3Fe0.7O3−δ oxygen electrodes for solid oxide electrolyzers

Enhancing Sr-deficient Sr(Ti0.3Fe0.7)O3–δ Cathode Performance through Sm0.5Sr0.5CoO3–δ Infiltration

“…All patterns match well with the characteristic peaks of SSC and STF cubic perovskite structures. 17,23,25 There are no indications of secondary phases and/ or major peak shifts within the instrument sensitivity range for annealing at 800 °C for 2 h (Fig. 1d), and even more notably at 900 °C for 100 h (Fig.…”

“…The Q rxn and Q ads elements simulate the capacitive nature of the corresponding processes. Given that the electronic resistance is much lower than the ionic resistance, 9,13,17,31 it is often neglected and thereby the TLM simplifies to: 9…”

“…Materials synthesis and cell fabrication.-Sr 0.95 Ti 0.3 Fe 0.7 O 3-δ (STF) was produced using a solid-state reaction detailed elsewhere. 17,27 The starting materials used were SrCO 3 (Sigmaz E-mail: b-park@pusan.ac.kr Aldrich, 99.9%), Fe 2 O 3 (Sigma-Aldrich, ⩾96%), and TiO 2 (Sigma-Aldrich, ⩾99%). After synthesis, the powders were ball-milled in ethanol for 48 h and dried.…”

“…3,16 An alternative way to improve the SrTi 0.3 Fe 0.7 O 3-δ polarization may be the introduction of a Sr deficiency. This can provide two primary advantages: [16][17][18] (i) a reduced TEC and (ii) improved oxygen transport coefficients owing to additional oxygen vacancies formed to compensate for the Sr vacancy. However, careful control of the electrode microstructure is required because of the enhanced sinterability of the material owing to the facile Sr diffusion.…”

“…However, careful control of the electrode microstructure is required because of the enhanced sinterability of the material owing to the facile Sr diffusion. 17,18 One simple method for revitalizing the coarse microstructure is electrode surface modification through single-step infiltration. 5,19 The technique is additive and can boost the electrochemical performance of the target electrode by using more active catalysts.…”