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- W3186500187 abstract "Development of an intermediate temperature (operating at 973 K or less) solid oxide fuel cell (SOFC) necessitates the design of efficient electrode materials to carry out oxygen reduction reaction (ORR) and transport at the cathode. Towards this, ORR in double perovskites materials of series LnBa1-xSrxCoyFe1-yO5+δ (LnBSCF, Ln = Gd, Pr) was studied. Molecular dynamics (MD) simulations were utilized to calculate the oxygen anion diffusivity (D) in the lattice of the double perovskite structured materials. In general, anisotropicity in oxygen transport was observed. For example, oxygen anion diffusion coefficient for the PrBaCo2O5+δ (PBCO) material was calculated to be 3 x 10-8 cm2 s-1 at 873 K in the a-b (Pr-O and Co-O) direction, which was observed to be higher than in the Ba-O plane (D = 8x10-9 cm2 s-1 at 873 K). On doping, PBCO with Sr and Fe cations, the resultant PrBa1-xSrxCoyFe1-yO5+δ (PBSCF) structure was calculated to show an order of magnitude higher diffusivity (D = 1.1x10--7 cm2 s-1 at 873 K) as compared to PBCO. Trends in calculated diffusion coefficients compared well with the measured electrocatalytic activity of the material reported in other experimental studies. The electrochemical measurements were performed on a geometrically well-defined nanostructured thin-film electrode, fabricated as a symmetric cell using a spray pyrolysis deposition method. Electrochemical experiments on thin-film electrodes provided an insight into the operating mechanism. Following the hypothesis of a characteristic thickness (Lc) below which the performance was expected to be predominantly controlled by surface reaction, the Lc for layered perovskite PBSCF at 863 K was calculated to be around 3.2 μm. Interestingly, the dense thin-film electrode of PBSCF (1 to 3 μm thick) deposited using the spray pyrolysis method showed a thickness dependent electrochemical performance suggesting bulk diffusion limitation1." @default.
- W3186500187 created "2021-08-02" @default.
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- W3186500187 date "2021-05-30" @default.
- W3186500187 modified "2023-09-23" @default.
- W3186500187 title "Nanostructuring Strategies to Control Surface Cation Segregation in Double Perovskite Electrodes for Solid Oxide Fuel Cells" @default.
- W3186500187 doi "https://doi.org/10.1149/ma2021-01371139mtgabs" @default.
- W3186500187 hasPublicationYear "2021" @default.
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