Abstract
High-performance solid oxide fuel cell (SOFC) is in urgent need of high-quality electrolyte powders with high reactivity and chemical uniformity. Here, 8 mol% Y2O3 doped ZrO2 (YSZ) nano-powders were synthesized by an improved solid-state reaction method at ambient temperature, and were applied to the fabrication of SOFC electrolytes. YSZ nano-powders show average grain sizes of ∼20 nm and high dispersibility, which is comparable with or even better than some other chemical methods. Benefitting from their high reactivity, dense YSZ electrolytes (relative density of 97.9%) can be obtained at a relatively low sintering temperature of 1400 °C. The optimized electrical conductivity reaches up to a high value of 0.034 S/cm at 800 °C in air. The anode supported single cell with the construction of Ni-YSZ/YSZ/Sm0.2Ce0.8O2–δ (SDC)/La0.6Sr0.4Co0.2Fe0.8O3–δ (LSCF) exhibits the peak power density of 0.827 W/cm2 at 800 °C while taking wet H2 as fuels and ambient air as oxidants.
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