Abstract
Heterostructure materials deliver special properties comparing with single phase materials. In this study, the performance of Na0.5Bi0.5TiO3 (NBT) electrolyte fuel cell is proved to be optimized by constructing heterostructures with other materials. SOFC based on NBT single phase electrolyte exhibits poor stability and low power output. By mixing NBT with electronic conductor La0.6Sr0.4Co0.2Fe0.8O3 (LSCF), improved performance is obtained and power output is observed to be dependent on the weight ratio of NBT to LSCF. It is interesting that the best performance is obtained in the cell with an optimized weight ratio of 30 wt% NBT - 70 wt% LSCF, in which the amount of electronic conductor exceeds that of ionic conductor. However, the stability of SOFC based on NBT-LSCF composite electrolyte still needs to be improved. In addition, the composition of sodium carbonate and lithium carbonate is added to the NBT-LSCF composite electrolyte for the purpose of creating amorphous shells around the NBT-LSCF particles, which is expected to protect the NBT-LSCF particles from reducing by hydrogen. Improved stability of the cell is then observed. This study provides an effective way to enhance the ionic conductivity and stability of electrolyte by constructing heterostructures.
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