Abstract
BaBiNb5O15 (BBN) based oxide-ion conductors have great potential for application in intermediate-temperature solid oxide fuel cells. In this work, electrical property enhancement is achieved by Sr2+ ion doping and sintering process improvement. The BaBi1-xSrxNb5O15-δ samples are prepared by the traditional solid-state reaction to investigate their electrical properties and oxygen relaxation behavior. Upon increasing the Sr2+ doping amount, the bulk conductivity of BaBi1-xSrxNb5O15-δ compounds increases first and then gradually decreases, and the bulk conductivity of the sample is the best when the doping concentration is 2 mol%. With the increase of Sr2+ doping, the activation energy shows a first decreasing and then increasing trend. Compared with the traditional sintering method, the total conductivity of the BaBi0.98Sr0.02Nb5O15-δ sample prepared by the two-step sintering method is greatly improved. These results have great implications for improving the electrical performances of BBN-based oxide conductors and studying their sintering process.
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