High stability SrTi_1−xFe_xO_3−δ electrodes for oxygen reduction and oxygen evolution reactions

Abstract

Sr(Ti1−xFex)O3−δ (STF) has been explored as a high stable oxygen electrode for oxygen reduction and oxygen evolution reactions.

Effect of sintering temperature on electrochemical performance of porous SrTi1-xFexO3-δ (x = 0.35, 0.5, 0.7) oxygen electrodes for solid oxide cells

“…Most studies have focussed on the properties of thin and dense STFx films used as model electrodes [24,28], whereas the properties of porous electrodes have practically not been studied. Our previous work showed good performance of porous STF35 (SrTi 0.65 Fe 0.35 O 3 ) electrodes [40,41], which has also been confirmed by other authors [38]. The obtained polarisation resistance results were comparable with the well-known LSCF electrode materials.…”

“…A more detailed discussion, including studies of the pO 2 /temperature dependence of the contributions, will be given in the future. For example, Zhang et al [38] recently studied STFx materials and used an equivalent circuit consisting of two components. Thus further studies are required to clarify the underlying mechanisms, which are needed to understand the behaviour of mixed ionicelectronic conductors.…”

“…high ionic conductivity (~10 −2 S cm −1 at 800°C) [28], they have found application as oxygen separation membranes [29,30], catalysts for water electrolysis reactions [31], resistive sensors of oxygen [32] and ethanol [33], and also in solid oxide fuel cell (SOFC) systems as electrodes [34][35][36] or the functional layer [37]. STFx-based materials show low polarisation resistance and good long term stability, including limited Sr surface segregation [38,39], which is problematic for LSC/LSCF compounds.…”

Performance modulation through selective, homogenous surface doping of lanthanum strontium ferrite electrodes revealed by in situ PLD impedance measurements

“…In the past years, several studies dealt with either finding new cathode materials or im-proving the existing ones. Here, mostly perovskite-type mixed ion and electron conducting (MIECs) cathode materials, such as La 1-x Sr x CoO 3-δ (LSC), [9][10][11][12][13][14][15][16] La 1-x Sr x FeO 3-δ (LSF), [17][18][19][20][21] La 1-x Ba x CoO 3-δ (LBC), 22,23 Sm 1-x Sr x CoO 3-δ (SSC) [24][25][26] , La 1-x Sr x Co 1-y Fe y O 3-δ (LSCF) [27][28][29][30][31][32] , SrTi 1-x Fe x O 3-δ , (STF) [33][34][35][36] or Ba 1-x Sr x Co 1-y Fe y O 3-δ (BSCF) [37][38][39] were investigated. In addition, studies on Pr 1-x Ce x O 2-δ (PCO) 40,41 , NdNi 2 O 4+δ (NNO) 42,43 or La 2 NiO 4+δ (LNO) 44,45 have been conducted.…”

Simulation of the Electrochemical Impedance in a Three-Dimensional, Complex Microstructure of Solid Oxide Fuel Cell Cathode and Its Application in the Microstructure Characterization

“…Additionally, the effective tortuosity of a microstructure in the low-frequency regime (where the tortuosity approaches the DC value) decreases with an increase in the ratio between the reaction rate constant and the bulk diffusion coefficient due to a decreased penetration depth of the electrode reactions. This finding suggests that the prevalent practice of using a single tortuosity value for a given electrode for extracting the material properties by employing the ALS model ( Adler, 1998 ; Zhang S.-L. et al, 2018 ; Zhang S.-L. et al, 2019 ) should be reviewed and revised. Additionally, the finding suggests that, both the intrinsic material properties and the microstructure should be considered concurrently in designing a cathode with enhanced performance.…”