Fig. 1. Preparation flow chart of the SOC

Fig. 2. Slurry clarification index diagram (a) and variation of slurry clarification index with time (b) of two kinds of NiO-YSZ water-based slurry

Fig. 3. Relaxation time of two kinds of NiO-YSZ water-based slurry

Fig. 4. Viscosity (a) and rheological curves (b) of two kinds of NiO-YSZ water-based slurry

Fig. 5. Surface micro-morphology of two kinds of slurries and Cell count of NiO and YSZ in two water-based slurries(a, c) Ink 1#, (b, d) Ink 2#

Fig. 6. Electrochemical performance and electrochemical impedance spectroscopy of large size SOC prepared by two kinds of slurry at 750 ℃ (Hydrogen electrode side: H₂ 810 sccm, Oxygen electrode side: Air 2 430 sccm )

Fig. 7. Electrochemical performance (a) and electrochemical impedance spectroscopy (b) of large-size SOC prepared by two kinds of slurry at 750 ℃ (Hydrogen electrode side: H₂ 500 sccm and O₂ 225 sccm, Oxygen electrode side: Air 1 500 sccm)

Fig. 8. SEM image of the cross section microstructure of large size SOC after testing