Optimisation of high-performance, cobalt-free SrFe1-xMoxO3-δ cathodes for solid oxide fuel cells prepared by spray pyrolysis

Enhancing the Electrochemical Performance in Symmetrical Solid Oxide Cells through Nanoengineered Redox-Stable Electrodes with Exsolved Nanoparticles

“…At intermediate temperatures, where the oxygen reduction kinetics and oxide-ion transport are slower, the application of a dc bias significantly increases the concentration of oxygen vacancies at the active sites, leading to a considerable improvement in the electrode performance. However, at higher temperatures, the intrinsic ionic conductivity of the electrodes becomes more dominant, reducing the influence of dc polarization on the formation of oxygen vacancies …”

“…When cathodic polarization is applied, the R p of LSFT 0.2 -Inf significantly decreases from 2.6 Ω cm 2 at open-circuit voltage (OCV) to 1.56 Ω cm 2 at −0.4 V at 600 °C (Figure a). This improvement is commonly attributed to the formation of additional oxygen vacancies due to a decrease of p O 2 under cathodic current, resulting in enhanced oxide-ion conduction . In general, a further reduction in R p is observed when the dc bias is reversed to the anodic mode, reaching 0.42 Ω cm 2 at +0.4 V at 600 °C (Figure b).…”

“…This improvement is commonly attributed to the formation of additional oxygen vacancies due to a decrease of pO 2 under cathodic current, resulting in enhanced oxide-ion conduction. 66 In general, a further reduction in R p is observed when the dc bias is reversed to the anodic mode, reaching 0.42 Ω cm 2 at +0.4 V at 600 °C (Figure 8b). This improved performance under anodic polarization has been previously associated with an increase of the pO 2 in the oxygen electrode, which improves the electron−hole conductivity.…”

“…At intermediate temperatures, where the oxygen reduction kinetics and oxide-ion transport are slower, the application of a dc bias significantly increases the concentration of oxygen vacancies at the active sites, leading to a considerable improvement in the electrode However, at higher temperatures, the intrinsic ionic conductivity of the electrodes becomes more dominant, reducing the influence of dc polarization on the formation of oxygen vacancies. 66 To gain further insights into the influence of the dc bias on each electrode response, the impedance spectra were deconvoluted by the DRT technique (Figures 8d and S9). The HF contribution, previously attributed to oxide-ion transport at the interface, remains unaffected by the applied dc current due to the excellent mixed ionic-electronic conductivity of the nanoengineered electrode and the rapid charge transfer process at the electrode/electrolyte interface.…”

Optimisation of the electrochemical performance of (Nd,Gd)1/3Sr2/3CoO3−δ cathode for solid oxide fuel cells via spray-pyrolysis deposition and decoration with Ag nanoparticles

“…8 V. Zapata-Ramírez et al reported the synthesis of SrFeO 3− δ -based cathodes deposited by spray pyrolysis with enhanced electrode behaviour due to improved homogeneity, distribution, and adhesion at the electrode–electrolyte interface. 9 Moreover, the methodology resulted particularly successful for the deposition of active interlayers to improve the electrochemical performance. 10,11…”