Comparative Characterization on Structural Properties of Calcined Sm0.5Sr0.5CoO3−δ - Sm0.2Ce0.8O1.9 Carbonate as Potential Composite Cathode for SOFC

Ahmad, Sufizar; Mohammad, Siti Fairus; Rahman, Hamidah Abdul; Taib, Hariati; Ismail, Ahmad Puad; Salleh, Salihatun Md; Mahzan, Shahruddin

doi:10.1088/1757-899x/494/1/012003

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“…Sm 0.5 Sr 0.5 CoO 3-δ (SSC) has attracted a lot of attention due to its excellent electrochemical performance and high mixed ion conductivity [12]. Sm 0.5 Sr 0.5 CoO 3-δ -Ce 0.8 Sm 0.2 O 1.9 (SSC-SDC) and SSC-GDC composite cathodes showed the improved performance in solid oxide fuel cell and electrolysis cell compared with LSM oxygen electrode [13][14][15][16][17][18]. Jiang et al [19] prepared the SSC-SDC composite material as the RSOC oxygen electrode, and it is found that the oxygen electrode performance of SSC-SDC had a great advantage over LSM.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Synthesis of Sm0.5Sr0.5Co0.5O3-δ@Sm0.2Ce0.8O1.9 Composite Oxygen Electrode for Electrolyte-Supported Reversible Solid Oxide Cells (RSOC)

et al. 2022

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Oxygen electrode has a crucial impact on the performance of reversible solid oxide cells (RSOC), especially in solid oxide electrolysis cell (SOEC) mode. Herein, Sm0.5Sr0.5Co0.5O3-δ@Sm0.2Ce0.8O1.9 (5SSC@5SDC) composite material has been fabricated by the in-situ synthesis method and applied as the oxygen electrode for RSOCs with scandium stabilized zirconia (SSZ) electrolyte. The phase structures, thermal expansion coefficients, and micromorphologies of 5SSC@5SDC have all been further analyzed and discussed. 5SSC@5SDC is composed of a skeleton with large SDC particles in the diameter range of 200~300 nm and many fine SSC nanoparticles coated on the skeleton. Thanks to the special microstructure of 5SSC@5SDC, the electrolyte-supported RSOC with SSC@SDC oxygen electrode shows a polarization resistance of only 0.69 Ω·cm2 and a peak power density of 0.49 W·cm-2 at 800 °C with hydrogen as the fuel in solid oxide fuel cell (SOFC) mode. In addition, the electrolysis current density of RSOC with SSC@SDC can reach 0.40 A·cm−2 at 1.30 V in SOEC model, being much higher than that with the SSC-SDC (SSC and SDC composite prepared by physical mixing). RSOC with 5SSC@5SDC shows an improved stability in SOEC model comparing with that with SSC-SDC. The improved performance indicates that 5SSC@5SDC prepared by the in-situ synthesis may be a promising candidate for RSOC oxygen electrode.

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