Preparation and characterization of GdSmZr2O7–(Li0.52Na0.48)2CO3 composite electrolyte for intermediate temperature solid oxide fuel cells
A novel GdSmZr 2 O 7 –(Li 0.52 Na 0.48 ) 2 CO 3 composite electrolyte material is successfully developed by pressureless-sintering for intermediate temperature solid oxide fuel cells. GdSmZr 2 O 7 nanopowders are synthesized by a low cost chemical coprecipitation and calcination method. The phase structure and morphology as a function of the calcination temperature are investigated by means of X-ray diffraction, scanning electron microscopy and transmission electron microscopy . The resulting GdSmZr 2 O 7 nanopowders after calcination at 800 °C for 5 h exhibit good crystallization and uniform particle morphology with an average size of 50 nm. The GdSmZr 2 O 7 –40 wt.% (Li 0.52 Na 0.48 ) 2 CO 3 composite sintered at 600 °C for 1 h has a high conductivity of 0.54 S cm −1 at a temperature of 600 °C. From the Arrhenius curve of the composite, the activation energy has different temperature behaviors around the knee region of 480 °C, where the slope changes and separates the intrinsic oxygen vacancy conduction dominated region from the ‘superionic highway’ region. For GdSmZr 2 O 7 –40 wt.% (Li 0.52 Na 0.48 ) 2 CO 3 composite at temperatures above 480 °C, there is good correlation between ionic diffusivity and conductivity. The introduction of (Li 0.52 Na 0.48 ) 2 CO 3 carbonate into GdSmZr 2 O 7 ceramics significantly promotes the enhancement of its conductivity by one or two orders of magnitude at the intermediate temperatures, especially above 480 °C. A maximum power density of 221 mW cm −2 at 650 °C was achieved for excellent performance of fuel cell based on GSZ–40LN composite electrolyte.
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