Application of La0.3Sr0.7Fe0.7Ti0.3O3-δ/GDC electrolyte in LT-SOFC

Recently semiconductor-ionic electrolytes have capture much attentions for its promising application in low temperature solid oxide fuel cells. In this paper, semiconductor La_0.3Sr_0.7Fe_0.7Ti_0.3O_3-δ (LSTF) and ionic Ce_0.9Gd_0.1O_2-δ (GDC) composites are investigated. The new composite consisting of LSTF and GDC are used as ionic-semiconductor electrolytes for LT-SOFC. It was found that when the ratio of LSTF to GDC was 5:5, the performance of the fuel cell is the best. The open circuit voltage is 0.92 V, and the power density is 654 mW cm^?2 at 600 °C. Its electrical performance is much higher than that of traditional SOFC at low temperature. The energy band of different semiconductor is discussed by using optical equipment.