Abstract
• Triple-conducting NBSCF was evaluated as impregnating material. • H-SOFCs with NBSCF modified LSCF composite cathode achieved a relatively high performance. • Migration of protons and oxygen ions were highly enhanced. Considering the sluggish cathode reaction rate, this work applied a triple conducting coating of NdBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (NBSCF) on a state-of-the-art La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3+δ (LSCF) cathode via a common infiltrating method. The electrical measurement revealed that the polarization resistance decrease from 0.44 to 0.14Ω·cm 2 and maximum power density increase from 486 to 696mW cm -2 at 700°C. Moreover, the analysis of distribution of relaxation time method (DRT) and impedance spectrums revealed that the migration rate of proton and oxygen ion was enhanced, indicating that the impregnation of triple-conducting materials could promote oxygen adsorption and ion migration.
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