Thursday, 5 October 2017: 11:20
National Harbor 7 (Gaylord National Resort and Convention Center)
Praseodymium nickelate (Pr2NiO4) is an active oxygen electrode in solid oxide fuel cells, however it undergoes a phase transition at elevated temperatures or under an electrochemical operation to form PrOx and higher ordered nickelate phase. In this work, we attempt to suppress the phase transition by adding Pr6O11 to Pr2NiO4 to form a composite. Two approaches are adopted: the first is to infiltrate Pr2NiO4 with Pr6O11 and the second one is to use a mixture of Pr2NiO4 and Pr6O11 powders. In case or (Pr,Nd)2NiO4 is used, the 2nd oxide phase is subsequently changed to (Pr,Nd)2O3. Anode supported single cells are used to measure the performance of the composite electrode. XRD is used to analyze the cathode structure and does show the suppression on phase evolution. In addition, the infiltrated cells show a high initial performance and the performance is stable during the 100-hours accelerated measurement.